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Sheahan Diamond Literature Reference Compilation 2015


The Sheahan Diamond Literature Reference Compilation
The Sheahan Diamond Literature Reference Compilation is compiled by Patricia Sheahan who publishes on a monthly basis a list of new scientific articles related to diamonds as well as media coverage and corporate announcementscalled the Sheahan Diamond Literature Service that is distributed as a free pdf to a list of followers. Pat has kindly agreed to allow her work to be made available as an online digital resource at Kaiser Research Online so that a broader community interested in diamonds and related geology can benefit. The references are for personal use information purposes only; when available a link is provided to an online location where the full article can be accessed or purchased directly. Reproduction of this compilation in part or in whole without permission from the Sheahan Diamond Literature Service is strictly prohibited. Return to Diamond Resource Center
Sheahan Diamond Literature Reference Compilation - Scientific Articles by Author for all years
A-An Ao+ B-Bd Be-Bk Bl-Bq Br+ C-Cg Ch-Ck Cl+ D-Dd De-Dn Do+ E F-Fn Fo+ G-Gh Gi-Gq Gr+ H-Hd He-Hn Ho+ I J K-Kg Kh-Kn Ko-Kq Kr+ L-Lh
Li+ M-Maq Mar-Mc Md-Mn Mo+ N O P-Pd Pe-Pn Po+ Q R-Rh Ri-Rn Ro+ S-Sd Se-Sh Si-Sm Sn-Ss St+ T-Th Ti+ U V W-Wg Wh+ X Y Z
Sheahan Diamond Literature Reference Compilation - Media/Corporate References by Name for all years
A B C D-Diam Diamonds Diamr+ E F G H I J K L M N O P Q R S T U V W X Y Z
Tips for Users
Posted/Published Reference CodesThe SDLRC provides 3 types of references identified in the reference code. DS for scientific article, DM for a media article, and DC for a corporate announcement. Consider DS0512-0001. The DS stands for "diamond scientific". 05 stands for 2005, the year the reference was posted. 12 represents the month the reference was posted. For all years prior to 2015 the default month is 12. -0001 is the reference's identifier and it does not mean anything. The number below the refence code, ie 2015, is the year the article was published. Note that the posted year may sometimes be later than the published year.
Sort OrderReferences are sorted by the "author" name and when the reference was posted to the compilation.
Most RecentIf the reference code is highlighted yellow, the reference was made available through the most recent monthly compilation of new literature. Use this to check out new references. When new references are posted, we make it our priority to track down an online link and obtain an abstract. With regard to older references, tracking down an abstract and an online link is a work in progress.
Link to external location of article: If the title has a link, it means we have found a location online where you can either retrieve the full article free, or purchase access to it. The Sheahan Diamond Literature Service is not a technical article procurement service; if you want a restricted article, you must deal directly with the vendor who controls the copyright to the article.
Searching this page for a specific term or authorIn your Firefox browser click Edit in the menu bar and then Find. In the Find box that shows up at the bottom of the web page enter your search term. Firefox will highlight all occurrences. This is particularly helpful when the author you are seeking was not the lead author by whom the compilation is sorted.
Sending or sharing a referenceThe left column (Posted/Published) has an embedded hyperlink for each reference. In Firefox, if you right click on it, you can obtain the link url for that reference's location within the page, which you can copy and paste into an email or any other document. You can also use the "share this link" option to tweet, facebook etc the link.
Monthly Sheahan Diamond Newsletters for 2015
January 2015 May 2015 September 2015
February 2015 June 2015 October 2015
March 2015 July 2015 November 2015
April 2015 August 2015 December 2015
2015 Reference Compilation
Posted/
Published
AuthorTitleSourceRegionKeywords
DC201512-2413
2015
92 Resources Corporation92 Resources Corp. considers FIn land diamond property, announces working capital private placement.92 Resources Corporation, Nov. 18, 1p.Europe, FinlandNews item - press release
DM201511-2110
2015
Abreu, F., Silva, L.F.How illegal diamond mining threatens Brazil's indigenous communities. Reported in Republicofmining.cominsightcrime.org, Oct. 14, 2p.South America, BrazilNews item - legal
DC201507-1379
2015
Adamera Minerals CorporationAdamera completes sale of diamond data.Adamera Minerals Corp., May 28, 1p.Canada, NunavutNews item - press release
DS201502-0036
2015
Afanasiev, V., Ashchekov, I., Nikolenko, E.Concentrates and mantle xenocrysts from the Lao River Guinea and reconstruction of the mantle structure. Economic Geology Research Institute 2015, Vol. 17,, # 2484, 1p. AbstractAfrica, GuineaKimberlite dykes
DC201502-1380
2015
Afri-Can Marine Minerals CorporationAfri-Can Marine Minerals Corporation trading halt and resignation of executives and directors. Afri-Can Marine Minerals Corporation, Jan. 5, 1p.Africa, NamibiaNews item - press release
DS201501-0001
2014
Ague, J.J.Deep carbon: subduction goes organic.Nature Geoscience, 2p.MantleCarbon

Abstract: Aqueous subduction-zone fluids contain CO2 and methane. New calculations indicate that these fluids also host a wide array of organic carbon species, in concentrations sufficient to influence the deep carbon cycle.
DS201511-1819
2014
Ahmat, A.L.The Ellendale diamond field: exploration history, discovery, geology and mining.Australian Gemmologist, Vol. 24, 12, pp. 280-288.AustraliaDeposit - Ellendale

Abstract: The Ellendale diamond field in West Kimberley is one of only three hard-rock diamond mine locations in Australia. Though not the first Australian diamond mine, Ellendale was the country’s first hard-rock deposit. It holds a special place in world diamond history as it led in November 1976 to the recognition of a new host-rock for diamond, olivine lamproite. Up until that time, commercial-sized diamonds were considered to be sourced only from kimberlite. The Ellendale lamproites are geologically very young, only 22 Ma (million of years) old. Within several years of the initial discovery, some 46 lamproite pipes were found at Ellendale. By 1980, 38 of these pipes had been assessed for their diamond content. More than two decades later, geologists from the Kimberley Diamond Company (KDC) recognized eluvial diamond enrichment over these pipes. After a lengthy legal battle, they wrested the Ellendale mining lease from the Ashton Joint Venture and commenced mining there in May 2002. Ellendale is recognized as a source of high-value fancy yellow diamonds. These high priced stones have been marketed through a special deal with Tiffany & Co since 2009. But the future of mining there is tenuous. Ellendale 4 was closed in 2009, and the high Australian dollar, combined with dwindling reserves, may jeopardize the survival of Ellendale 9.
DS201502-0037
2015
Ahmed, A.H., Habtoor, A.Heterogeneously depleted Precambrian lithosphere deduced from mantle peridotites and associated chromitite deposits of Al, Ays ophiolite, northwestern Arabian shield, Saudi Arabia.Ore Geology Reviews, Vol. 67, pp. 279-296.Africa, Saudi ArabiaPeridotite

Abstract: The mantle section of Al'Ays ophiolite consists of heterogeneously depleted harzburgites, dunites and large-sized chromitite pods. Two chromitite-bearing sites (Site1 and Site2), about 10 km apart horizontally from one another, were examined for their upper mantle rocks. Cr-spinels from the two sites have different chemistry; Cr-rich in Site1 and Al-rich in Site2. The average Cr-ratio = (Cr/(Cr + Al) atomic ratio) of Cr-spinels in harzburgites, dunites and chromitites is remarkably high 0.78, 0.77 and 0.87, respectively, in Site1, compared with those of Site2 which have intermediate ratio averages 0.5, 0.56 and 0.6, respectively. The platinum-group elements (PGE) in chromitites also show contrasting patterns from Site1 to Site2; having elevated IPGE (Os, Ir, Ru) and strongly depleted in PPGE (Rh, Pt, Pd) with steep negative slopes in the former, and gentle negative slopes in the latter. The oxygen fugacity (?log fO2) values deduced from harzburgites and dunites of Site1 show a wide variation under reducing conditions, mostly below the FMQ buffer. The Site2 harzburgites and dunites, on the other hand are mostly above the FMQ buffer. Two magmatic stages are suggested for the lithospheric evolution of Al'Ays ophiolite in response to a switch of tectonic setting. The first stage produced a peridotites–chromitites suite with Al-rich Cr-spinels, possibly beneath a mid-ocean ridge setting, or most likely in back-arc rift of a supra-subduction zone setting. The second stage involved higher degrees of partial melting, produced a peridotites–chromitites suite with Cr-rich Cr-spinels, possibly in a fore-arc setting. The coexistence of compositionally different mantle suites with different melting histories in a restricted area of an ophiolite complex may be attributable to a mechanically juxtaposed by mantle convection during recycling. The mantle harzburgites and dunites are apt to be compositionally modified during recycling process; being highly depleted (Site1 case) than their original composition (Site2 case).
DS201503-0131
2015
Alifirova, T.A., Pokhilenko, L.N., Korsakov, A.V.Apatite, SiO2, rutile and orthopyroxene precipitates in minerals of eclogite xenoliths from Yakutian kimberlites, Russia.Lithos, Vol. 226, pp. 31-49.Russia, YakutiaDeposit - Udachnaya, Zarnitsa, Obnazhennaya

Abstract: Eclogite mantle xenoliths from the central part of Siberian craton (Udachnaya and Zarnitsa kimberlite pipes) as well as from the northeastern edge of the craton (Obnazhennaya kimberlite) were studied in detail. Garnet and clinopyroxene show evident exsolution textures. Garnet comprises rutile, ilmenite, apatite, and quartz/coesite oriented inclusions. Clinopyroxene contains rutile (± ilmenite) and apatite precipitates. Granular inclusions of quartz in kyanite and garnet usually retain features of their high-pressure origin. According to thermobarometric calculations, studied eclogitic suite was equilibrated within lithospheric mantle at 3.2–4.9 GPa and 813–1080 °C. The precursor composition of garnets from Udachnaya and Zarnitsa eclogites suggests their stability at depths 210–260 km. Apatite precipitation in clinopyroxenes of Udachnaya and Zarnitsa allows us to declare that original pyroxenes could have been indicative of their high P–T stability. Raman spectroscopic study of quartz and coesite precipitates in garnet porphyroblasts confirms our hypothesis on the origin of the exsolution textures during pressure-temperature decrease. With respect to mineralogical data, we suppose the rocks to be subjected to stepwise decompression and cooling within mantle reservoir.
DM201501-0441
2014
AllAfricaMissing 100 carat diamond sold for US $ 1.5 million in Dubai. West African diamond company.Allafrica.com, Dec. 15, 1p.Africa, LiberiaNews item - legal
DM201501-2481
2014
AllAfricaBotswana: more in store for Jwaneng, Orapa mines.Allafrica.com, Nov. 30, 1p.Africa, BotswanaNews item - Debswana
DM201502-0442
2014
AllAfricaMwadui U.S. production, mine life span. Allafrica.com, Dec. 22, 1/2p.Africa, TanzaniaNews item - Petra
DM201502-0443
2014
AllAfricaEndiama to reduce operation costs.Allafrica.com, Dec. 30, 1/4p.Africa, AngolaNews item - Endiama
DM201502-0444
2014
AllAfricaGov't still fighting for diamonds seized in Belgium.Allafrica.com, Dec. 30, 1/4p.Africa, ZimbabweNews item - legal
DM201502-0445
2015
AllAfricaLunda Sul - Catoca ensures continued focus on betterment of working conditions.Allafrica.com, Jan. 5, 1/4p.Africa, AngolaNews item - Catoca
DM201502-0446
2015
AllAfricaIts time we became diamond people. ( value added processes needed)Allafrica.com, Jan. 10, 1p. Africa, ZimbabweNews item - legal
DM201502-0447
2015
AllAfricaFresh bid to grab mining companies…. Murowa mentioned.Allafrica.com, Jan. 17, 1/4p.Africa, ZimbabweNews item - Rio Tinto
DM201503-0448
2015
AllAfricaAngolan mining sector new project … Cambange in eastern Lunda Norte.Allafrica.com, Feb. 12, 1p.Africa, AngolaNews item - Mining UARi-society
DM201504-0452
2015
AllAfricaChinamasa - forget diamonds, Zim is broke.AllAfrica.com, Mar. 5, 1/2p.Africa, ZimbabweNews item - Marange
DM201504-0453
2015
AllAfricaBotswana: Debswana upgrades Seepapitso Labs.AllAfrica.com, Mar. 12, 1/2p.Africa, NamibiaNews item - Debswana
DM201504-0454
2015
AllAfricaDiamond board wants 24 hr access to Oranjemund.AllAfrica.com, Mar. 12, 1/2p.Africa, NamibiaNews item - legal
DM201505-0449
2015
AllAfricaProduction at Mwadui Diamond mine rises. 27% to 57,542 caratsAllafrica.com, Apr. 17, 1/4p.Africa, TanzaniaNews item - Petra
DM201505-2476
2015
AllAfricaDiamond miners on looting spree.Allafrica.com, Mar. 27, 1/4p.Africa, ZimbabweNews item - Marange
DM201507-0455
2015
AllAfricaGovt loses potential revenue after mine's closure. DTZ-OZGEO alluvial operation.Allafrica.com, June 2, 1/4p.Africa, ZimbabweNews item - DTZ-OZGEO
DM201507-0456
2015
AllAfricaZim sells $ 1.4 million carats of rough diamonds.Allafrica.com, June 11, 1/4p.Africa, ZimbabweNews item - rough
DM201508-0450
2015
AllAfricaRiozim committed to Murowa. Rio Zim held 22 % and now controls the entity after its major shareholder Gem Holdings bought 78 % from Rio Tinto.Allafrica.com, July 16, 1p.Africa, ZimbabweNews item - RioZim
DM201508-0451
2015
AllAfricaDebswana Diamond Company shown commitment to the submission of training and labour.Allafrica.com, July 27, 1/2p.Africa, BotswanaNews item - CSR
DM201508-2482
2015
AllAfricaAngola, Russia discuss co-operation in diamond industry. Catoca, Tchiuzo, LuaxeAllafrica.com, July 2, 1/4p.Africa, AngolaNews item - Alrosa
DM201510-2000
2015
AllAfricaDiamond production increases in country. CatocaAllafrica.com, Aug. 27, 1/4p.Africa, AngolaNews item - production
DM201510-2001
2015
AllAfricaMwadui mine life extended 20 years.Allafrica.com, Sept. 19, 1/4p.Africa, TanzaniaNews item - Petra
DM201512-2210
2015
AllAfricaMarange diamond licences have now expired: minister.. Giving government an advantage for consolidation of the sector.Allafrica.com, Oct. 30, 1p.Africa, ZimbabweNews item - Marange
DM201512-2211
2015
AllAfricaGun thefts leave diamond big shots paranoid. Allafrica.com, Nov. 27, 1/4p.Africa, NamibiaNews item - legal
DM201512-2212
2015
AllAfricaNamibia has 1,5 billion carats at sea. Allafrica.com, Nov. 27, 1/4p.Africa, NamibiaNews item - marine mining
DM201512-2213
2015
AllAfricaDebswana partnership solid in Botswana.Allafrica.com, Nov. 23, 1/4p.Africa, BotswanaNews item - Debswana
DC201503-1383
2015
AlrosaAlrosa reports Q2 production results. H1 2014 results and sales.Alrosa, Jan. 31, 3p.RussiaNews item - press release
DC201505-1384
2015
AlrosaAlrosa Investors-Day presentation. Detailed locations, projects, financialsAlrosa, Apr. 8, 45pptRussiaNews item - Alrosa
DC201505-1385
2015
AlrosaAlrosa's executive Committtee considered the 2014 exploration performance to declare all the targets successfully achieved.[email protected], Apr. 17, 2p.RussiaNews item - press release
DC201501-1386
2014
Alto Ventures Ltd.Alto initiates airborne magnetometer survey on its Pikoo area, diamond claims, Saskatchewan.Alto Ventures Lt., Dec. 17, 1p.Canada, SaskatchewanNews item - press release
DC201502-1387
2015
Alto Ventures Ltd.Alto Ventures review of 2014 activities. PikooAlto Ventures Ltd., Jan. 14, 1p.Canada, SaskatchewanNews item - press release
DC201502-1388
2015
Alto Ventures Ltd.Alto Ventures confirms kimberlite indicator minerals on the GEFA property adjacent to Pikoo, Northern Saskatchewan.Alto Ventures Ltd., Jan. 22, 2p.Canada, SaskatchewanNews item - press release
DC201504-1389
2015
Alto Ventures Ltd.Priority targets identified from high resolution airborne magnetic Survey adjacent to Pikoo diamond discovery, northern Saskatchewan.Alto Ventures Ltd., Feb. 26, 2p.Canada, SaskatchewanNews item - press release
DC201505-1390
2015
Alto Ventures Ltd.Alto Ventures recovers kimberlite indicator minerals on the West Fisher claims northwest of the Pikoo diamond discovery, northern Saskatchewan.Alto Ventures Ltd., Apr. 1, 1p.Canada, SaskatchewanNews item - press release
DC201505-1391
2015
Alto Ventures Ltd.Priority targets from high resolution airborne magnetic survey over West Fisher claims northwest of Pikoo diamond discovery, northern Saskatchewan. Alto Ventures Ltd., Apr. 22, 1p.Canada, SaskatchewanNews item - press release
DC201510-2329
2015
Alto Ventures Ltd.Alto Ventures arranges financing plans till sampling on its Pikoo area claims, northern Saskatchewan.Alto Ventures Limited, Sept. 24, 1p.Canada, SaskatchewanNews item - press release
DS201503-0132
2015
Amit, H., Olson, P.Lower mantle superplume growth excites geomagnetic reversals.Earth and Planetary Science Letters, Vol. 414, March 15, pp. 68-76.MantleHotspots

Abstract: Seismic images of the lower mantle reveal two large-scale, low shear wave velocity provinces beneath Africa and the Pacific that are variously interpreted as superplumes, plume clusters or piles of dense mantle material associated with the layer. Here we show that time variations in the height of these structures produce variations in heat flux across the core–mantle boundary that can control the rate at which geomagnetic polarity reversals occur. Superplume growth increases the mean core–mantle boundary heat flux and its lateral heterogeneity, thereby stimulating polarity reversals, whereas superplume collapse decreases the mean core–mantle boundary heat flux and its lateral heterogeneity, inhibiting polarity reversals. Our results suggest that the long, stable polarity geomagnetic superchrons such as occurred in the Cretaceous, Permian, and earlier in the geologic record were initiated and terminated by the collapse and growth of lower mantle superplumes, respectively.
DM201511-2111
2015
Amnesty InternationalChains of abuse: the case of diamonds from the Central African Republic and the global diamond supply chain.Amnestyinternational.org, Sept. 3p.Africa, Central African RepublicNews item - KP, CSR

Abstract: Amnesty International has examined three specific points in the global diamond supply chain, starting with diamonds in the Central African Republic (CAR), moving to two of CAR’s neighbours into which some of its diamonds are smuggled, and ending at diamond exchanges in the major global trading centres of Antwerp and Dubai. CAR has been embroiled in armed conflict since late 2012. The report uses CAR as a case study to examine the diamond supply chain but looks beyond the conflict to human rights abuses in the artisanal mining sector in CAR and to other illegal and unethical practices in the diamond supply chain that cause or contribute to human rights abuses – such as smuggling and tax abuse.
DS201501-0002
2014
Anderson, D.L., King, S.D.Driving the Earth machine?Science, Vol. 346, 6214, pp. 1184-1185.MantleAthenosphere, magmatism

Abstract: The asthenosphere—derived from the Greek asthen?s, meaning weak—is the uppermost part of Earth's mantle, right below the tectonic plates that make up the solid lithosphere. First proposed by Barrell 100 years ago (1), the asthenosphere has traditionally been viewed as a passive region that decouples the moving tectonic plates from the mantle and provides magmas to the global spreading ridge system. Recent studies suggest that the asthenosphere may play a more active role as the source of the heat and magma responsible for intraplate volcanoes. Furthermore, it may have a major impact on plate tectonics and the pattern of mantle flow.
DS201510-1756
2014
Andreeva, I.A.Salt ( carbonatite) melts of the Bol'shaya Tagna Massif, the eastern Sayan region: evidence from melt inclusions.Deep-seated magmatism, its sources and plumes, Proceedings of XIII International Workshop held 2014., Vol. 2014, pp. 148-159.RussiaMineral chemistry
DS201502-0038
2015
Angel, R.J., Alvaro, M., Nestola, F., Mazzucchelli, M.L.Diamond thermoelastic properties and implications for determining the pressure of formation of diamond inclusion systems.Russian Geology and Geophysics, Vol. 56, 1-2, pp. 211-220.TechnologyDiamond inclusions

Abstract: The formation conditions of diamond can be determined from the residual pressure of inclusions trapped within the diamond, as measured at ambient conditions, and the equations of state (EoS) of the mineral inclusion and the host diamond. The EoS parameters of the diamond and the inclusion phase are therefore critical for determining the precision and accuracy of the calculation of formation conditions of diamonds. The questions we address are (i) How precise are these calculations? and, in particular, (ii) Do we know the EoS parameters of diamond to a precision and accuracy which do not contribute significantly to uncertainties in the geological conclusions drawn from these calculations? We present a review of the most recent compressional data, simulations, and direct elastic measurements of diamond and show them to be consistent with a room-temperature bulk modulus of K0T = 444(2) GPa and a pressure derivative K = 4.0. In combination with a thermal-pressure model with parameters aV300,0 = 2.672(3) x 10- 6 K- 1 and a single Einstein temperature 0E = 1500 K, the volume variation of diamond from room conditions to pressures and temperatures exceeding those in the Earth’s transition zone is described to within the levels of uncertainty inherent in both experimental and computational determinations. For the example of olivine inclusions in diamond, these uncertainties in the diamond EoS parameters lead to uncertainties in the entrapment pressures of no more than 0.001 GPa at low temperatures and 0.008 GPa at higher temperatures.
DS201503-0133
2015
Araujo e Azevedo, P., Peres Rocha, M., Pereira Soares, J.E., Fuck, R.A.Thin lithosphere beween the Amazonian and Sao Francisco cratons, in central Brazil, revealed by seismic P wave tomography.Geophysical Journal International, Vol. 201, 1, pp. 61-69.South America, BrazilGeophysics - seismic

Abstract: Results of P-wave traveltime seismic tomography in central Brazil unravel the upper-mantle velocity structure and its relationship with the tectonic framework. Data were recorded between 2008 and 2012 at 16 stations distributed over the study area, and were added to the database used by Rocha et al. to improve the resolution of anomalies, and to image the surrounding regions. The main objective was to observe the upper-mantle boundary zone between the Amazonian and São Francisco cratons, represented by mobile belts, inside the Tocantins Province, and to study the lithosphere related to the collision between these two cratons during the Neoproterozoic. A set of low-velocity anomalies was observed crossing the study area in the NE–SW direction, in agreement with the main trend of the Transbrasiliano lineament. The region where the anomalies are located was interpreted as the zone separating the Amazonian and São Franciscan palaeoplates. There is a good correlation between the low-velocity anomalies and the high seismicity of this region, suggesting that it is a region of weakness, probably related to lithospheric thinning. High velocities were observed under the Amazonian and São Francisco cratons. A model is proposed for the lithospheric subsurface in central Brazil, emphasizing the boundary zone between the main palaeoplates in the study area. After merging both databases, the low-velocity anomalies in the central part of the study area suggest tectonic partitioning of the lithosphere. Synthetic tests show that the tomography results are robust.
DC201502-1392
2014
Archangel Diamond CorpLukoil wins dismissal of USA lawsuit over alleged fraud. ( Archangel Diamond Company JV with Arkhangelgeology AGE)OAO Lukoil , Dec. 23, 1p.RussiaNews item - press release
DC201502-1393
2015
Arctic Star Exploration CorporationArctic Star stakes Torrie kimberlite cluster at Lac de Gras.Arctic Star Exploration, Jan. 16, 1p.Canada, Northwest TerritoriesNews item - press release
DC201503-1395
2015
Arctic Star Exploration CorporationArctic Star announces "Stein diamond project", Nunavut Canada.Arctic Star Exploration Corporation, Feb. 5, 1p.Canada, NunavutNews item - press release
DC201507-1394
2015
Arctic Star Exploration CorporationArctic Star updates the Redemption diamond project, Lac de Gras.Arctic Star Exploration, June 2, 1p.Canada, Northwest TerritoriesNews item - press release
DC201509-1396
2015
Arctic Star Exploration CorporationArctic Star reports on T-Rex property.Arctic Star Exploration Corporation, Aug. 5, 4p.Canada, Northwest TerritoriesNews item - press release
DS201510-1757
2014
Arzamastev, A.A., Arztmasteva, L.V., Zhirova, A.M., Glaznev, V.N.Model of formation of the Khibiny-Lovozero ore bearing volcanic-plutonic complex.Deep-seated magmatism, its sources and plumes, Proceedings of XIII International Workshop held 2014., Vol. 2014, pp. 124-147.Baltic Shield, FennoscandiaCarbonatite, alkaline rocks

Abstract: The paper presents the results of a study of the large Paleozoic ore-magmatic system in the northeastern Fennoscandian Shield comprising the Khibiny and Lovozero plutons, the Kurga intrusion, volcanic rocks, and numerous alkaline dike swarms. As follows from the results of deep drilling and 3D geophysical simulation, large bodies of rocks pertaining to the ultramafic alkaline complex occur at the lower level of the ore-magmatic system. Peridotite, pyroxenite, melilitolite, melteigite, and ijolite occupy more than 50 vol % of the volcanic-plutonic complex within the upper 15 km accessible to gravity exploration. The proposed model represents the ore-magmatic system as a conjugate network of mantle magmatic sources localized at different depth levels and periodically supplying the melts belonging to the two autonomous groups: (1) ultramafic alkaline rocks with carbonatites and (2) alkali syenites-peralkaline syenites, which were formed synchronously having a common system of outlet conduits. With allowance for the available isotopic datings and new geochronological evidence, the duration of complex formation beginning from supply of the first batches of melt into calderas and up to postmagmatic events, expressed in formation of late pegmatoids, was no less than 25 Ma.
DS201502-0039
2015
Ashchepkov, I.The universal Cpx Jd-Di barometer for mantle peridotite eclogite and pyroxenites and its use for mantle petrology.Economic Geology Research Institute 2015, Vol. 17,, # 2121, 1p. AbstractTechnologyBarometer

Abstract: Original monomineral thermobarometers for mantle peridotites for clinopyroxene, garnet, chromite and ilmenites for the mantle peridotites were statistically calibrated on the PT estimates for mantle peridotites [Ashchepkov et al., 2010] were tested using the mineral phases obtained in high pressure experiments with the natural peridotites (380 runs) [Brey et al.,1990; 2008 etc] and eclogites (240 runs)[Dasgupta et al., 2006 etc]. In the original program of that written on FORTRAN are assembled the most reliable methods of mineral thermometers (45) and barometers (36) and oxybarometers (5), including original monomineral and methods [Ashchepkov, 2003 Ashchepkov et al., 2008; 2009; 2010; 2011] for the mantle peridotites bases on the compositions of on clinopyroxene, garnet, chromite and ilmenite. Program reads the text files, which converted from Excel. Original data include standard silicate compositions for 12 components in standard order. The text file includes 15 columns of 8 symbols. The first is file name which is the same for all the minerals in the association. The second is indicator symbol for phases. E- enstatite, D - diopside, O-olivine, S-spinel, G- garnet, I –ilmenite, A- amphibole, F – phlogopite, P-plagioclase, L- liquid, R- bulk rock. Then follow oxides: SiO2, TiO2, Al2O3, Cr2O3, FeO, MnO, MgO, CaO, Na2O, K2O, NiO, V2O3 written with 2–3 decimals. The last column may contain description of the mineral or association up to 64 symbols. Monomineral methods use calculated values for Fe#Ol or Fe#Cpx. The input from console includes file name (8 symbols) (A8), then amount of PT pairs of numbers thermometers and barometers (2I2) and one for FO2 method. Program allows input of the iteration numbers (to 25 by default). It allow to choose whether to use the calculated Fe3+ for the minerals and also. It is possible also to put fixed values of T and P (default 1000oC and 40 kbar ).
DS201502-0040
2015
Ashchepkov, I., Ntaflos, T., Spetsius, Z.Trace element study of the xenoliths study of the mantle xenoliths from Sytykanskaya pipe, Yakutia.Economic Geology Research Institute 2015, Vol. 17,, # 2624, 1p. AbstractRussiaDeposit - Sytykanskaya
DS201510-1758
2015
Ashchepkov, I.V., Logvinova, A.M., Reimers, L.F., Ntaflos, T., Spetisus, Z.V., Vladykin, N.V., Downes, H., Yudin, D.S., Travin, A.V., Makovchuk, I.V., Palesskiy, V.S., KhmelNikova, O.S.The Sytykanskaya kimberlite pipe: evidence from deep seated xenoliths and xenocrysts for the evolution of the mantle beneath Alakit, Yakutia, Russia.Geoscience Frontiers, Vol. 6, 5, pp. 687-714.Russia, YakutiaDeposit - Sytykanskaya

Abstract: Mantle xenoliths (>150) and concentrates from late autolithic breccia and porphyritic kimberlite from the Sytykanskaya pipe of the Alakit field (Yakutia) were analyzed by EPMA and LAM ICP methods. In P-T-X-f(O2) diagrams minerals from xenoliths show widest variations, the trends P-Fe#-CaO, f(O2) for minerals from porphyric kimberlites are more stepped than for xenocrysts from breccia. Ilmenite PTX points mark moving for protokimberlites from the lithosphere base (7.5 GPa) to pyroxenite lens (5-3.5 GPa) accompanied by Cr increase by AFC and creation of two trends P-Fe#Ol ?10-12% and 13-15%. The Opx-Gar-based mantle geotherm in Alakit field is close to 35 mW/m2 at 65 GPa and 600 °C near Moho was determined. The oxidation state for the megacrystalline ilmenites is lower for the metasomatic associations due to reduction of protokimberlites on peridotites than for uncontaminated varieties at the lithosphere base. Highly inclined linear REE patterns with deep HFSE troughs for the parental melts of clinopyroxene and garnet xenocrysts from breccia were influenced by differentiated protokimberlite. Melts for metasomatic xenoliths reveal less inclined slopes without deep troughs in spider diagrams. Garnets reveal S-shaped REE patterns. The clinopyroxenes from graphite bearing Cr-websterites show inclined and inflected in Gd spectrums with LREE variations due to AFC differentiation. Melts for garnets display less inclined patterns and Ba-Sr troughs but enrichment in Nb-Ta-U. The 40Ar/39Ar ages for micas from the Alakit mantle xenoliths for disseminated phlogopites reveal Proterozoic (1154 Ma) age of metasomatism in early Rodinia mantle. Veined glimmerites with richterite - like amphiboles mark ?1015 Ma plume event in Rodinia mantle. The ?600-550 Ma stage manifests final Rodinia break-up. The last 385 Ma metasomatism is protokimberlite-related.
DS201510-1759
2014
Ashchepkov, I.V., Vladykin, N.V., Ntaflos, T., Logvinova, A.M., Yudin, D.S., Karpenko, M.A., Paleeskiy, V.S., Alymova, N.V., Khmelnikova, O.S.Deep seated xenoliths and xencrysts from Sytykanskaya pipe: evidence for the evolution of the mantle beneath Alakit, Yakutia.Deep-seated magmatism, its sources and plumes, Proceedings of XIII International Workshop held 2014., Vol. 2014, pp. 203-232.Russia, YakutiaDeposit - Sytykanskaya

Abstract: The concentrate from two phases of the kimberlite (breccia and porphyritic kimberlite) and about 130 xenoliths from the Sytykanskaya pipe of the Alakit field (Yakutia) were studied by EPMA and LAM ICP methods. Reconstructions of the PTXfO2 mantle sections were made separately for the two phases. The porphyritic kimberlites and breccia show differences in the minerals although the layering and pressure interval remains the same. For the porphyritic kimberlite the trends P- Fe# - CaO in garnet, fO2 are sub-vertical while the xenocrysts from the breccia show stepped and curved trends possibly due to interaction with fluids. Minerals within xenoliths show the widest variation in all pressure intervals. PT points for the ilmenites which trace the magmatic system show splitting of the magmatic source into two levels at the pyroxenite lens (4GPa) accompanied by peridotite contamination and an increase in Cr in ilmenites. Two groups of metasomatites with Fe#Ol ~ 10-12% and 13-15% were created by the melts derived from protokimberlites and trace the mantle columns from the lithosphere base (Ilm - Gar - Cr diopside) to Moho becoming essentially pyroxenitic (Cr-diopside with Phl). The first Opx-Gar-based mantle geotherm from the Alakit field has been constructed from15 associations and is close to 35 mw/m2 in the lower part of mantle section but deviates to high temperatures in the upper part of the mantle section. The oxidation state for the protokimberlite melts determined from ilmenites is higher than for the other pipes in the Yakutian kimberlite province which probably accounts for the decrease in the diamond grade of this pipe. The geochemistry of the minerals (garnets and clinopyroxenes) from breccias, metasomatic peridotite xenoliths and pyroxenites systematically differ. Xenocrysts from the breccia were produced by the most differentiated melts and enriched protokimberlite or carbonatite; they show highly inclined nearly linear REE patterns and deep troughs of HFSE. Minerals of the metasomatic xenoliths are less inclined with lower La/Cen ratios and without troughs in spider diagrams. The garnets often show S-shaped patterns. Garnets from the Cr websterites show round REE patterns and deep troughs in Ba-Sr but enrichment in Nb-Ta-U. The clinopyroxenes reveal the inclined and inflected on Gd spectrums with variations in LREE due to AFC differentiation. The 40Ar-39Ar ages for micas from the Alakit field reveal three intervals for the metasomatism. The first (1154 Ma) relates to dispersed phlogopites found throughout the mantle column, and probably corresponds to the continental arc stage in the early stage of Rodinia. Veined highly alkaline and Ti-rich veins with richterite ~1015 Ma corresponds to the plume event within the Rodinia mantle. The ~600-550 Ma stage marks the final Rodinia break-up. The last one near 385 Ma is protokimberlite related.
DC201506-1397
2015
Astro Resources nlHighlights East Kimberley diamonds.Astro Resources nl, Apr. 29, 1p.AustraliaNews item - press release
DC201509-1398
2015
Astro Resources NLEast Kimberley diamonds project ( near Argyle AK1 pipe). Quarterly updateAstro Resources NL, July 30, 12p.AustraliaNews item - press release
DC201512-2414
2015
Astro Resources nlDrilling and geophysical dat a identified seven priority potential lamproite pipe targets. East KimberleyAstro Resources nl, Oct. 27, 1p AustraliaNews item - press release
DC201502-1399
2015
Athabasca Nuclear CorporationAthabasca Nuclear options Pikoo North diamond project.Athabasca Nuclear Corporation, Jan. 2, 1p.Canada, SaskatchewanNews item - press release
DC201510-2330
2015
Athabasca Nuclear CorporationAthabasca Nuclear Corporation announces commencement of Pikoo airborne survey.Athabasca Nuclear Corporation, Sept. 16, 1p.Canada, SaskatchewanNews item - press release
DC201512-2415
2015
Athabasca Nuclear CorporationProngua Lake project update. Airborne survey.Athabasca Nuclear Corporation, Oct. 29, 1p.Canada, SaskatchewanNews item - press release
DC201512-2416
2015
Athabasca Nuclear CorporationAnnounces Pikoo airborne results at Prongua Lake.Athabasca Nuclear Corporation, Nov. 17, 1p.Canada, SaskatchewanNews item - press release
DS201511-1820
2015
Aulbach , S., Viljoen, K.S.Eclogite xenoliths from the Lace kimberlite, Kaapvaal craton: from convecting mantle source to palaeo-ocean floor and back.Earth and Planetary Science Letters, Vol. 431, pp. 274-286.Africa, South AfricaDeposit - Lace

Abstract: Major- and trace-element compositions of eclogite and pyroxenite xenoliths of ?2.5 Ga age (in situ Pb-Pb data on clinopyroxene) from the Lace kimberlite on the Kaapvaal craton were investigated in order to constrain: (1) the nature and evolution of their protoliths; (2) the extent to which they preserve information on the state of the asthenospheric mantle source that gave rise to their low-pressure protoliths; and (3) the effect of their deep recycling on the radiogenic isotope evolution of the convecting mantle. Their elemental relationships are consistent with low-pressure fractionation of olivine ± plagioclase and clinopyroxene during oceanic crust formation, whereby the residual melt was enriched in rare-earth elements (REE), high field-strength elements and Y, producing inverse correlations of ?REE with the size of Eu- and Sr-anomalies. LREE-depletion may indicate loss of on average 20% of a partial melt upon subduction and metamorphism (eclogitisation) of oceanic crust, which did not, however, contribute to juvenile growth of continental crust. The eclogites have median Sm/Nd (0.40) and Lu/Hf (0.27) similar to Depleted Mantle, and lower U/Pb (0.02) and Th/Pb (0.02). If deeply subducted, these rocks cannot explain unradiogenic Nd and Hf, and radiogenic Pb isotope compositions in the sources of some modern ocean island basalts. Low incompatible trace-element contents similar to picrites, and Yb concentrations at a given TiO2 content similar to modern MORB, indicate derivation of the protoliths by average melt fractions of ?0.20-0.25?0.20-0.25 that left a spinel peridotite residue at pressures ?2.5 to 3.0 GPa. This shallow intersection of the peridotite solidus suggests moderate Archaean ambient mantle potential temperatures of ?1420 to 1470?°C. Samples filtered for clinopyroxene fractionation and metasomatism have V/Sc (4.7±1.24.7±1.2; n=11n=11) indicating lower fO2fO2 (?1.9 relative to the fayalite-magnetite-quartz buffer=?FMQbuffer=?FMQ) than modern MORB. This is in part due to the higher average melt extraction pressure (?1.5 GPa) during formation of their crustal protoliths. Extrapolation to 1 GPa, similar to the average pressure of present-day MORB generation, yields ?FMQ of ?1.7±1.1?1.7±1.1, corresponding to Fe3+# of 0.07±0.040.07±0.04. If these results are correct, they suggest an Archaean ambient mantle more reducing than at present, with implications for the speciation of volatiles, which affects the mantle solidus and the composition of volcanic gases. This has implications for the Archaean atmospheric redox evolution and the recycling of carbon and other volatiles.
DS201501-0003
2015
Ault, A.K., Flowers, R.M., Bowlring, S.A.Synchroneity of cratonic burial phases and gaps in kimberlite record: episodic magmatism or preservational bias?Earth and Planetary Science Letters, Vol. 410, pp. 97-104.Global, CanadaThermochronology - Slave craton

Abstract: A variety of models are used to explain an apparent episodicity in kimberlite emplacement. Implicit in these models is the assumption that the preserved kimberlite record is largely complete. However, some cratons now mostly devoid of Phanerozoic cover underwent substantial Phanerozoic burial and erosion episodes that should be considered when evaluating models for global kimberlite distributions. Here we show a broad temporal coincidence between regional burial phases inferred from thermochronology and gaps in the kimberlite record in the Slave craton, Superior craton, and cratonic western Australia. A similar pattern exists in the Kaapvaal craton, although its magmatic, deposition, and erosion history differs in key ways from the other localities. One explanation for these observations is that there is a common cause of cratonic subsidence and suppression of kimberlite magmatism. Another possibility is that some apparent gaps in kimberlite magmatism are preservational artifacts. Even if kimberlites occurred during cratonic burial phases, the largest uppermost portions of the pipes would have been subsequently eroded along with the sedimentary rocks into which they were emplaced. In this model, kimberlite magmatism was more continuous than the preserved record suggests, implying that evidence for episodicity in kimberlite genesis should be carefully evaluated in light of potential preservational bias effects. Either way, the correlation between burial and kimberlite gaps suggests that cratonic surface histories are important for understanding global kimberlite patterns.
DS201511-1821
2012
AusIMM JORCAustralasian code for reporting of exploration results, mineral resources and ore reserves. There is a mention of micros in this 2012 version. Tania has updated the next SAMREC version with alluivials and micros which may be available in 2016 and will bJORC Ore Reserves Committee, 2012, 44p. Available pdfGlobalMicrodiamonds - responses
DM201504-0457
2015
Australian MiningArgyle pink diamond coin retailing for a cool $ 8k.Australian Mining, Mar. 4, 1/4p.AustraliaNews item - Argyle
DS201501-0004
2014
Bah, M.D.Mining for peace: diamonds, bauxite, iron ore and political stability in Guinea.Review of African Political Economy, Routledge Pub., Vol. 41, no. 142, pp. 500-515.Africa, GuineaHistory

Abstract: The article explores the relationship between mineral resources and conflict management in Guinea. Literature on theories of recent civil wars and/or armed conflicts in West Africa identifies the combination of abundant natural resources and extreme poverty as a significant trigger of violent civil conflicts. In Guinea, however, despite this combination, the state has managed to avoid large-scale civil violence. This gives rise to the question of why this combination has failed to be associated with the onset of large-scale violence in the country. The article identifies mitigating factors that have contributed to political stability in Guinea. It concludes that measures taken by Guinea and its international partners mitigated the security threats posed by these resources, while keeping most Guineans in abject poverty. This is in contrast to findings in recent quantitative studies whereby natural resource abundance alongside extreme poverty is strongly associated with armed conflicts in West African nations.
DS201507-0303
2015
Bailey, B.L., Blowes, D.W., Smith, L., Sego, D.C.The Diavik waste rock project: geochemical and microbiological characterization of drainage from low sulfide waste rock: active zone field experiments.Applied Geochemistry, Vol. 36, pp. 187-199.Canada, Northwest TerritoriesDeposit - Diavik
DS201512-1896
2015
Bailey, B.L., Blowes, D.W., Smith, L., Sego, D.C.The Diavik waste rock project: geochemical and microbiological characterization of low sulfide content large-scale waste rock test piles.Applied Geochemistry, Vol. 62, pp. 18-34.Canada, Northwest TerritoriesDeposit - Diavik

Abstract: Two experimental waste-rock piles (test piles), each 15 m in height × 60 m × 50 m, were constructed at the Diavik diamond mine in Northern Canada to study the behavior of low-sulfide content waste rock, with a similarly low acid-neutralization potential, in a continuous permafrost region. One test pile with an average of 0.035 wt.% S (<50 mm fraction; referred to as Type I) and a second test pile with an average of 0.053 wt.% S (<50 mm fraction; referred to as Type III) were constructed in 2006. The average carbon content in the <50 mm fraction of waste rock in the Type I test pile was 0.031 wt.% as C and in the Type III test pile was 0.030 wt.% as C. The NP:AP ratio, based on the arithmetic mean of particle-size weighted NP and AP values, for the Type I test pile was 12.2, suggesting this test pile was non-acid generating and for the Type III test pile was 2.2, suggesting an uncertain acid-generating potential. The Type I test pile maintained near-neutral pH for the 4-year duration of the study. Sulfate and dissolved metal concentrations were low, with the exception of Ni, Zn, Cd, and Co in the fourth year following construction. The pore water in the Type III test pile contained higher concentrations of SO42? and dissolved metals, with a decrease in pH to <4.7 and an annual depletion of alkalinity. Maximum concentrations of dissolved metals (20 mg L?1 Ni, 2.3 mg L?1 Cu, 3.7 mg L?1 Zn, 35 ?g L?1 Cd, and 3.8 mg L?1 Co) corresponded to decreases in flow rate, which were observed at the end of each field season when the contribution of the total outflow from the central portion of the test pile was greatest. Bacteria were present each year in spite of annual freeze/thaw cycles. The microbial community within the Type I test pile included a population of neutrophilic S-oxidizing bacteria. Each year, changes in the water quality of the Type III test-pile effluent were accompanied by changes in the microbial populations. Populations of acidophilic S-oxidizing bacteria and Fe-oxidizing bacteria became more abundant as the pH decreased and internal test pile temperatures increased. Irrespective of the cold-climate conditions and low S content of the waste rock, the geochemical and microbiological results of this study are consistent with other acid mine drainage studies; indicating that a series of mineral dissolution-precipitation reactions controls pH and metal mobility, and transport is controlled by matrix-dominated flow and internal temperatures.
DS201501-0005
2014
Bain & CompanyThe global diamond report 2014, Diamonds: timeless gems in a changing world. Challenges, financing, supply and demandBain & Company, 84p. Pdf availableGlobalDiamond markets

Abstract: In this year’s edition: Diamonds: Timeless Gems in A Changing World, we focus on key challenges facing the industry, initiatives under way to address them, and possible outcomes that would support the industry’s continued growth. We believe that the challenges explored in this report also present opportunities for all players in the diamond industry and for the investment community. The key challenges include the following: Sustaining demand for diamonds in jewelry and as investments. What models of cooperation are players adopting to spur demand for diamonds, in jewelry and as an investment vehicle? Securing long-term access to diamonds. As long-term supply tapers off, what options can retailers consider? Defining the role of synthetic diamonds. What opportunities and challenges will the continued evolution of synthetic-diamond technologies present to the industry? Ensuring that diamond financing will continue to sustain industry growth. How should the diamond-financing business model evolve to sustain healthy growth for all industry players? As in previous years, the report also identifies key trends along the value chain for rough and polished diamonds as well as diamond jewelry. We compare 2013 results with the results of previous years and highlight the impact of continuing economic uncertainty on the diamond market. We also provide an update on the outlook for the diamond industry through 2024. The 2024 demand outlook is based on our extensive market analysis and research. The updated supply forecast is based on the latest developments among key diamond miners and the largest diamond mines worldwide.
DS201505-0254
2015
Ballmer, M.D., Conrad, C.P., Smith, E.I., Johnsen, R.Intraplate volcanism at the edges of the Colorado Plateau sustained by a combination of triggered edge-driven convection and shear-driven upwelling.Geochemistry, Geophysics, Geosystems: G3, Vol. 16, 2, pp. 366-379.United States, Colorado PlateauConvection

Abstract: Although volcanism in the southwestern United States has been studied extensively, its origin remains controversial. Various mechanisms such as mantle plumes, upwelling in response to slab sinking, and small-scale convective processes have been proposed, but have not been evaluated within the context of rapidly shearing asthenosphere that is thought to underlie this region. Using geodynamic models that include this shear, we here explore spatiotemporal patterns of mantle melting and volcanism near the Colorado Plateau. We show that the presence of viscosity heterogeneity within an environment of asthenospheric shearing can give rise to decompression melting along the margins of the Colorado Plateau. Our models indicate that eastward shear flow can advect pockets of anomalously low viscosity toward the edges of thickened lithosphere beneath the plateau, where they can induce decompression melting in two ways. First, the arrival of the pockets critically changes the effective viscosity near the plateau to trigger small-scale edge-driven convection. Second, they can excite shear-driven upwelling (SDU), in which horizontal shear flow becomes redirected upward as it is focused within the low-viscosity pocket. We find that a combination of “triggered” edge-driven convection and SDU can explain volcanism along the margins of the Colorado Plateau, its encroachment toward the plateau's southwestern edge, and the association of volcanism with slow seismic anomalies in the asthenosphere. Geographic patterns of intraplate volcanism in regions of vigorous asthenospheric shearing may thus directly mirror viscosity heterogeneity of the sublithospheric mantle.
DS201509-0384
2015
Baptiste, V., Demouchy, S., Keshav, S., Parat, F., Bolfan-Casanova, N., Condamine, P., Cordier, P.Decrease of hydrogen in corporation in forsterite from CO2-H2O rich kimberlitic liquid.American Mineralogist, Vol. 100, pp. 1912-1920.TechnologyHydrogen, water

Abstract: To test if hydrogen incorporation by ionic diffusion can occur between a volatile-rich kimberlitic liquid and forsterite, results of high-pressure and high-temperature experiments using a piston-cylinder apparatus at 1200–1300 °C and 1 GPa for durations of 1 min, 5 h, and 23 h, are reported here. Kim-berlitic liquid in the system CaO-MgO-Al 2 O 3-SiO 2-CO 2-H 2 O and synthetic forsterite single crystals were chosen as a first simplification of the complex natural kimberlite composition. Unpolarized Fourier transform infrared spectroscopy was used to quantify the concentrations of OH in the crystallographically oriented forsterite. Scanning electron microscopy, electron backscattered diffraction, electron microprobe analyses, and transmission electron microscopy were performed to identify the run products. After 5 and 23 h, a forsterite overgrowth crystallized with the same orientation as the initial forsterite single crystal. The kimberlitic liquid has crystallized as micrometer-scale euhedral forsterite neocrystals with random crystallographic orientations, as well as a nanoscale aluminous phase and a calcic phase. Despite theoretical water-saturation of the system and long duration, none of the initial forsterite single crystals display signs of hydration such as hydrogen diffusion profile from the border toward the center of the crystal. Most likely, the presence of CO 2 in the system has lowered the H 2 O fugacity to such an extent that there is no significant hydration of the starting forsterite single crystal or its overgrowth. Also, the presence of CO 2 enhances rapid forsterite crystal growth. Forsterite growth rate is around 2 × 10 8 mm 3 /h at 1250 °C. These experimental results suggest a deep mantle origin of the high OH content found in natural mantle-derived xenoliths transported in kimberlites, as reported from the Kaapvaal craton. In agreement with previous studies, it also points out to the fact that significant hydration must take place in a CO 2-poor environment.
DS201504-0183
2015
Barry, P.H., Hilton, D.R., Day, J.M.D., Pernet-Fisher, J.F., Howarth, G.H., Magna, T., Agashev, A.M., Pokhilenko, N.P., Opkhilenko, L.N., Taylor, L.A.Helium isotope evidence for modification of the cratonic lithosphere during the Permo-Triassic Siberian flood basalt event.Lithos, Vol. 216-217, pp. 73-80.Russia, SiberiaDeposit - Udachnaya, Obnazhennaya

Abstract: Major flood basalt emplacement events can dramatically alter the composition of the sub-continental lithospheric mantle (SCLM). The Siberian craton experienced one of the largest flood basalt events preserved in the geologic record — eruption of the Permo-Triassic Siberian flood basalts (SFB) at ~250 Myr in response to upwelling of a deep-rooted mantle plume beneath the Siberian SCLM. Here, we present helium isotope (3 He/ 4 He) and concentra-tion data for petrologically-distinct suites of peridotitic xenoliths recovered from two temporally-separated kim-berlites: the 360 Ma Udachnaya and 160 Ma Obnazhennaya pipes, which erupted through the Siberian SCLM and bracket the eruption of the SFB. Measured 3 He/ 4 He ratios span a range from 0.1 to 9.8 R A (where R A = air 3 He/ 4 He) and fall into two distinct groups: 1) predominantly radiogenic pre-plume Udachnaya samples (mean clinopyroxene 3 He/ 4 He = 0.41 ± 0.30 R A (1?); n = 7 excluding 1 outlier), and 2) 'mantle-like' post plume Obnazhennaya samples (mean clinopyroxene 3 He/ 4 He = 4.20 ± 0.90 R A (1?); n = 5 excluding 1 outlier). Olivine separates from both kimberlite pipes tend to have higher 3 He/ 4 He than clinopyroxenes (or garnet). Helium con-tents in Udachnaya samples ([He] = 0.13–1.35 ?cm 3 STP/g; n = 6) overlap with those of Obnazhennaya ([He] = 0.05–1.58 ?cm 3 STP/g; n = 10), but extend to significantly higher values in some instances ([He] = 49– 349 ?cm 3 STP/g; n = 4). Uranium and thorium contents are also reported for the crushed material from which He was extracted in order to evaluate the potential for He migration from the mineral matrix to fluid inclusions. The wide range in He content, together with consistently radiogenic He-isotope values in Udachnaya peridotites suggests that crustal-derived fluids have incongruently metasomatized segments of the Siberian SCLM, whereas high 3 He/ 4 He values in Obnazhennaya peridotites show that this section of the SCLM has been overprinted by Permo-Triassic (plume-derived) basaltic fluids. Indeed, the stark contrast between pre-and post-plume 3 He/ 4 He ra-tios in peridotite xenoliths highlights the potentially powerful utility of He-isotopes for differentiating between various types of metasomatism (i.e., crustal versus basaltic fluids).
DS201511-1822
2015
Bartels, A., Nielsen, T.F.D., Lee, S.R.G.J., Upton, B.G.J.Petrological and geochemical characteristics of Mesoproterozoic dyke swarms in the Gardar Province, south Greenland: evidence for a major sub-continental lithospheric mantle component in the generation of the magmas.Mineralogical Magazine, Vol. 79, 4, pp. 909-939.Europe, GreenlandDike swarms

Abstract: The Mesoproterozoic Gardar Province in South Greenland developed in a continental rift-related environment. Several alkaline intrusions and associated dyke swarms were emplaced in Archaean and Ketilidian basement rocks during two main magmatic periods at 1300-1250 Ma and 1180-1140 Ma. The present investigation focuses on mafic dykes from the early magmatic period (‘Older Gardar’) and the identification of their possible mantle sources. The rocks are typically fine- to coarse-grained dolerites, transitional between tholeiitic and alkaline compositions with a general predominance of Na over K. They crystallized from relatively evolved, mantle-derived melts and commonly show minor degrees of crustal contamination. Selective enrichment of the large ion lithophile elements Cs, Ba and K and the light rare-earth elements when compared to high field-strength elements indicate significant involvement of a sub-continental lithospheric mantle (SCLM) component in the generation of the magmas. This component was affected by fluid-dominated supra-subduction zone metasomatism, possibly related to the Ketilidian orogeny ~500 Ma years prior to the onset of Gardar magmatism. Melt generation in the SCLM is further documented by the inferential presence of amphibole in the source region, negative calculated ?Nd(i) values (?0.47 to ?4.40) and slightly elevated 87Sr/86Sr(i) (0.702987 to 0.706472) ratios when compared to bulk silicate earth as well as relatively flat heavy rare-earth element (HREE) patterns ((Gd/Yb)N = 1.4-1.9) indicating melt generation above the garnet stability field. The dyke rocks investigated show strong geochemical and geochronological similarities to pene-contemporaneous mafic dyke swarms in North America and Central Scandinavia and a petrogenetic link is hypothesized. Considering recent plate reconstructions, it is further suggested that magmatism was formed behind a long-lived orogenic belt in response to back-arc basin formation in the time interval between 1290-1235 Ma.
DS201511-1823
2004
Barton, E.Small is beautiful… the recovery of microdiamonds helps to predict the presence of commercial sized diamonds.Inside Mining, Vol. 109, July, pp. 32-35. Available pdfAfricaMicrodiamonds - responses

Abstract: The recovery and analysis of microdiamonds helps to predict the presence of commercial-sized diamonds in kimberlites. It is a cost-effective method for prioritising targets for bulk sampling.
DS201503-0136
2015
Bastow, I.D., Eaton, D.W., Kendall, J-M., Helffrich, G., Snyder, D.B., Thompson, D.A., Wookey, J., Darbyshire, F.A., Pawlak, A.E.The Hudson Bay lithospheric experiment ( HuBLE): insights into Precambrian plate tectonics and the development of mantle keels.Geological Society of London Special Publication: Continent formation through time., No. 389, pp. 41-67.Canada, Ontario, QuebecGeotectonics

Abstract: Hudson Bay Lithospheric Experiment (HuBLE) was designed to understand the processes that formed Laurentia and the Hudson Bay basin within it. Receiver function analysis shows that Archaean terranes display structurally simple, uniform thickness, felsic crust. Beneath the Palaeoproterozoic Trans-Hudson Orogen (THO), thicker, more complex crust is interpreted as evidence for a secular evolution in crustal formation from non-plate-tectonic in the Palaeoarchaean to fully developed plate tectonics by the Palaeoproterozoic. Corroborating this hypothesis, anisotropy studies reveal 1.8 Ga plate-scale THO-age fabrics. Seismic tomography shows that the Proterozoic mantle has lower wavespeeds than surrounding Archaean blocks; the Laurentian keel thus formed partly in post-Archaean times. A mantle transition zone study indicates ‘normal’ temperatures beneath the Laurentian keel, so any cold mantle down-welling associated with the regional free-air gravity anomaly is probably confined to the upper mantle. Focal mechanisms from earthquakes indicate that present-day crustal stresses are influenced by glacial rebound and pre-existing faults. Ambient-noise tomography reveals a low-velocity anomaly, coincident with a previously inferred zone of crustal stretching, eliminating eclogitization of lower crustal rocks as a basin formation mechanism. Hudson Bay is an ephemeral feature, caused principally by incomplete glacial rebound. Plate stretching is the primary mechanism responsible for the formation of the basin itself.
DS201502-0041
2014
Batanova, V.G., Lyaskovskaya, Z.E., Savelieva, G.N., Sobolev, A.V.Peridotites from the Kamchatsky Mys: evidence of oceanic mantle melting near a hotspot.Russian Geology and Geophysics, Vol. 55, pp. 1395-1403.RussiaHarzburgite, plumes

Abstract: A suite of mantle peridotites sampled in the Kamchatsky Mys includes spinel lherzolite, clinopyroxene-bearing harzburgite, and harzburgite. Mineral chemistry of olivine, chromian spinel, and clinopyroxene show strongly correlated element patterns typical of peridotite formed by 8% to more than 22% partial melting. Clinopyroxene in the Kamchatka peridotites is compositionally different from that of both abyssal and suprasubduction varieties: Clinopyroxene in lherzolite is depleted in LREE relative to abyssal peridotite and that in harzburgite has very low LREE and Sr unlike the subduction-related counterpart. These composition features indicate that the rocks ultra-depleted in basaltic components originated in the vicinity of a hotspot, possibly, proto-Hawaiian plume, which provided high temperature and melting degree of the MORB source mantle at mid-ocean ridge.
DM201501-0458
2014
Bates, R.Believe it: the lab-grown diamond sector is out promoting the natural diamonds.jckonline.com, Dec. 12, 1p.TechnologyNews item - Pure Grown
DM201502-0459
2015
Bates, R.Being a sightholder is a fool's errand. JSCK Online blog, Jan. 23, 1p.GlobalNews item - De Beers
DC201509-1400
2015
Bauer Foundations Canada Inc.Bauer Group acquires major project to build cut-off wall for diamond mine in Canada. DiavikBauer Foundations Canada Inc., Aug. 1p.Canada, Northwest TerritoriesNews item - press release
DC201503-1401
2015
Beaufort SecuritiesParagon Diamonds … emerging diamond producer with polished upside, fully funded. LemphaneBeaufort Securities Research Report, Feb. 12, 6p.Africa, LesothoNews item - Paragon
DS201512-1897
2015
Belcourt, G.A 2015 geophysical update for Kennady North project, NT.43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 16.Canada, Northwest TerritoriesDeposit - Kennady North

Abstract: This presentation will provide an update of geophysical surveys performed in 2015. These surveys were undertaken to aid in the delineation of known kimberlites and discovery of potential kimberlite targets on Kennady Diamonds Inc.'s Kennady North Property. In 2015, Kennady Diamonds Inc. focused most of their geophysical budget on expansion of the known kimberlites. Previous OhmMapper surveys were expanded in the Doyle & MZ Areas in order to provide locations for exploration drilling. Ground based Gravity surveys were completed using an increased sample density in key areas. This increased density in the gravity data proved to be very helpful in the detailed drilling of the Kelvin and Faraday kimberlite bodies. Late in the summer season, a small scale marine seismic system was utilized on the Kelvin and Faraday lakes. This data will hopefully be used to discover potential areas of new or thicker kimberlite under the lake. As the Kelvin and Faraday kimberlites are not the typical pipe-like bodies, many different geophysical tools from our toolbox must be utilized.
DS201506-0256
2015
Bell, K., Zaitsev, A.N., Spratt, J., Frojdo, S., Rukhlov, A.S.Elemental, lead and sulfur isotopic compositions of galena from Kola carbonatites, Russia - implications for melt and mantle evolution.Mineralogical Magazine, Vol. 79, 2, pp. 219-241.RussiaCarbonatite, Kola

Abstract: Galena from four REE-rich (Khibina, Sallanlatvi, Seblyavr, Vuoriyarvi) and REE-poor (Kovdor) carbonatites, as well as hydrothermal veins (Khibina) all from the Devonian Kola Alkaline Province of northwestern Russia was analysed for trace elements and Pb and S isotope compositions. Microprobe analyses show that the only detectable elements in galena are Bi and Ag and these vary from not detectable to 2.23 and not detectable to 0.43 wt.% respectively. Three distinct galena groups can be recognized using Bi and Ag contents, which differ from groupings based on Pb isotope data. The Pb isotope ratios show significant spread with 206Pb/204Pb ratios (16.79 to 18.99), 207Pb/204Pb (15.22 to 15.58) and 208Pb/204Pb ratios (36.75 to 38.62). A near-linear array in a 207Pb/204Pb vs. 206Pb/204Pb ratio diagram is consistent with mixing between distinct mantle sources, one of which formed during a major differentiation event in the late Archaean or earlier. The S isotopic composition (?34S) of galena from carbonatites is significantly lighter (–-6.7 to -–10.3% Canyon Diablo Troilite (CDT) from REE-rich Khibina, Seblyavr and Vuoriyarvi carbonatites, and - 3.2% CDT from REE-poor Kovdor carbonatites) than the mantle value of 0%. Although there is no correlation between S and any of the Pb isotope ratios, Bi and Ag abundances correlate negatively with ?34S values. The variations in the isotopic composition of Pb are attributed to partial melting of an isotopically heterogeneous mantle source, while those of ?34S (together with Bi and Ag abundances) are considered to be process driven. Although variation in Pb isotope values between complexes might reflect different degrees of interaction between carbonatitic melts and continental crust or metasomatized lithosphere, the published noble gas and C, O, Sr, Nd and Hf isotopic data suggest that the variable Pb isotope ratios are best attributed to isotopic differences preserved within a sub-lithospheric mantle source. Different Pb isotopic compositions of galena from the same complex are consistent with a model of magma replenishment by carbonatitic melts/fluids each marked by quite different Pb isotopic compositions.
DS201505-0249
2015
Belogub, E.V., Krivovichev, S.V., Pekov, I.V., Kuznetsov, A.M., Yapaskurt, V.O., Kitlyarov, V.A., Chukanov, N.V., Belakoviskiy, D.I.Nickelpicromerite, K2Ni(SO4)2*6H2O, a new picromerite group mineral from Slyudorudnik, South Urals, Russia.Mineralogy and Petrology, Vol. 109, 2, pp. 143-152.Russia, UralsMineralogy

Abstract: A new picromerite-group mineral, nickelpicromerite, K2Ni(SO4)2 - 6H2O (IMA 2012-053), was found at the Vein #169 of the Ufaley quartz deposit, near the town of Slyudorudnik, Kyshtym District, Chelyabinsk area, South Urals, Russia. It is a supergene mineral that occurs, with gypsum and goethite, in the fractures of slightly weathered actinolite-talc schist containing partially vermiculitized biotite and partially altered sulfides: pyrrhotite, pentlandite, millerite, pyrite and marcasite. Nickelpicromerite forms equant to short prismatic or tabular crystals up to 0.07 mm in size and anhedral grains up to 0.5 mm across, their clusters or crusts up to 1 mm. Nickelpicromerite is light greenish blue. Lustre is vitreous. Mohs hardness is 2-2½. Cleavage is distinct, parallel to {10-2}. Dmeas is 2.20(2), Dcalc is 2.22 g cm?3. Nickelpicromerite is optically biaxial (+), ? = 1.486(2), ? = 1.489(2), ? = 1.494(2), 2Vmeas =75(10)°, 2Vcalc =76°. The chemical composition (wt.%, electron-microprobe data) is: K2O 20.93, MgO 0.38, FeO 0.07, NiO 16.76, SO3 37.20, H2O (calc.) 24.66, total 100.00. The empirical formula, calculated based on 14 O, is: K1.93Mg0.04Ni0.98S2.02O8.05(H2O)5.95. Nickelpicromerite is monoclinic, P21/c, a = 6.1310(7), b = 12.1863(14), c = 9.0076(10) Å, ? = 105.045(2)°, V = 649.9(1) Å3, Z = 2. Eight strongest reflections of the powder XRD pattern are [d,Å-I(hkl)]: 5.386--34(110); 4.312-46(002); 4.240-33(120); 4.085--100(012, 10-2); 3.685-85(031), 3.041-45(040, 112), 2.808-31(013, 20-2, 122), 2.368-34(13-3, 21-3, 033). Nickelpicromerite (single-crystal X-ray data, R = 0.028) is isostructural to other picromerite-group minerals and synthetic Tutton’s salts. Its crystal structure consists of [Ni(H2O)6]2+ octahedra linked to (SO4)2? tetrahedra via hydrogen bonds. K+ cations are coordinated by eight anions. Nickelpicromerite is the product of alteration of primary sulfide minerals and the reaction of the acid Ni-sulfate solutions with biotite.
DS201511-1824
2015
Bergantz, G.W., Schleicher, J.M., Burgisser, A.Open system dynamics and mixing in magma mushes.Nature Geoscience, Vol. 8, 10, pp. 793-796.MantleMagmatism

Abstract: Magma dominantly exists in a slowly cooling crystal-rich or mushy state1, 2, 3. Yet, observations of complexly zoned crystals4, some formed in just one to ten years5, 6, 7, 8, 9, as well as time-transgressive crystal fabrics10 imply that magmas mix and transition rapidly from a locked crystal mush to a mobile and eruptable fluid5, 6. Here we use a discrete-element numerical model that resolves crystal-scale granular interactions and fluid flow, to simulate the open-system dynamics of a magma mush. We find that when new magma is injected into a reservoir from below, the existing magma responds as a viscoplastic material: fault-like surfaces form around the edges of the new injection creating a central mixing bowl of magma that can be unlocked and become fluidized, allowing for complex mixing. We identify three distinct dynamic regimes that depend on the rate of magma injection. If the magma injection rate is slow, the intruded magma penetrates and spreads by porous media flow through the crystal mush. With increasing velocity, the intruded magma creates a stable cavity of fluidized magma that is isolated from the rest of the reservoir. At higher velocities still, the entire mixing bowl becomes fluidized. Circulation within the mixing bowl entrains crystals from the walls, bringing together crystals from different parts of the reservoir that may have experienced different physiochemical environments and leaving little melt unmixed. We conclude that both granular and fluid dynamics, when considered simultaneously, can explain observations of complex crystal fabrics and zoning observed in many magmatic systems.
DS201504-0184
2015
Berryman, E.J., Wunder, B., Wirth, R., Rhede, D., Schettler, G., Franz, G., Heinrich, W.An experimental study on K and Na in corporation in dravitic tourmaline and insight into the origin of Diamondiferous tourmaline from the Kokchetav Massif, Kazakhstan.Contributions to Mineralogy and Petrology, Vol. 169, 19p.Russia, KazakhstanDiamondiferous tourmaline

Abstract: Tourmaline was synthesized in the system MgO-Al2O3-B2O3-SiO2-KCl-NaCl-H2O from an oxide mixture and excess fluid at 500-700 °C and 0.2-4.0 GPa to investigate the effect of pressure, temperature, and fluid composition on the relative incorporation of Na and K in dravitic tourmaline. Incorporation of K at the X-site increases with pressure, temperature, and KCl concentration; a maximum of 0.71 K pfu (leaving 0.29 X-vacant sites pfu) was incorporated into K-dravite synthesized at 4.0 GPa, 700 °C from a 4.78 m KCl, Na-free fluid. In contrast, Na incorporation depends predominately on fluid composition, rather than pressure or temperature; dravite with the highest Na content of 1.00 Na pfu was synthesized at 0.4 GPa and 700 °C from a 3.87 m NaCl and 1.08 m KCl fluid. All synthesized crystals are zoned, and the dominant solid solution in the Na- and K-bearing system is between magnesio-foitite [?(Mg2Al)Al6Si6O18(BO3)3(OH)3OH] and dravite [NaMg3Al6Si6O18(BO3)3(OH)3(OH)], with the dravitic component increasing with the concentration of Na in the fluid. In the K-bearing, Na-free system, the dominant solid solution is between magnesio-foitite and K-dravite [KMg3Al6Si6O18(BO3)3(OH)3(OH)], with the K-dravitic component increasing with pressure, temperature, and the concentration of K in the fluid. The unit-cell volume of tourmaline increases with K incorporation from 1555.1(3) to 1588.1(2) Å3, reflecting the incorporation of the relatively large K+ ion. Comparison of our results to the compositional data for maruyamaite (K-dominant tourmaline) from the ultrahigh-pressure rocks of the Kokchetav Massif in Kazakhstan suggests that the latter was formed in a K-rich, Na-poor environment at ultrahigh-pressure conditions near the diamond-stability field.
DS201510-1760
2015
Beyer, C.Geobarometry, phase relations and elasticity of eclogite under conditions of Earth's upper mantle. IN ENGLISHThesis, Doctoral Beyreuther Graduiertenschule fur Mathematik und Naturwissenschaften IN: ENGLISH, 222p. Available pdfMantleGeobarometry

Abstract: Eclogite rocks, composed mainly of garnet and clinopyroxene, form principally as a metamorphic product of oceanic crust as it undergoes subduction. The equilibrium between garnet and clinopyroxene is sensitive to temperature and pressure, therefore eclogitic outcrops and xenoliths can reveal important information on the chemical and mineralogical processes occurring during such episodes. This is particularly the case for lithospheric eclogitic xenoliths from Archean cratons, which can potential reveal information on ancient (> 1 Ga) subduction events. To obtain information on the depth of origin of eclogitic xenoliths the first project of this thesis was designed to establish a thermodynamically grounded geobarometer, which is based on the incorporation of tetrahedrally coordinated aluminum in clinopyroxene coexisting with garnet: 2/3 Ca3Al2Si3O12 + 1/3 Mg3Al2Si3O12 = CaAl2SiO6 + CaMgSi2O6 Grossular Pyrope CaTs Diopside The reaction was calibrated against high-pressure and high-temperature experiments carried out in the multi-anvil and piston-cylinder apparatus between pressures of 3 and 7 GPa and temperatures from 1200 to 1550 °C. Starting materials were hydrous and anhydrous synthetic mixtures of basaltic bulk compositions that yielded homogeneous bimineralic garnet-clinopyroxene phase assemblages. The experimental data set was expanded by employing results from previous experimental studies conducted in eclogitic systems, which widened the range of applicable conditions and compositions. The calibration reproduces experimental pressures of bimineralic eclogite assemblages, in addition to SiO2-saturated and kyanite-bearing eclogites, to within 0.4 GPa at the 95 % confidence interval. The barometer was then used to examine equilibration pressures recorded by natural mantle eclogites from various xenolith locations covering a wide pressure, temperature, and compositional range. The results seem to indicate that many eclogite xenoliths fall towards the hotter side of the range of geothermal temperatures displayed by peridotitic xenoliths from the same localities. The second project calibrates the composition of majoritic garnets, which contain excess silicon substituted onto the octahedrally coordinated garnet site, coexisting with clinopyroxene as a function of pressure, temperature and bulk composition. Majorite substitution for a given bulk composition increases with pressure, and its proportion can in principal be used as a geobarometer. Single majoritic garnet crystals are found as inclusions in diamonds, which are generally used to support a sublithospheric origin in the deeper upper mantle or transition zone. The chemical compositions of such inclusions indicate that they have formed from a number of different lithologies, including mafic, ultramafic and pyroxenitic. These inclusions give important insight into the environment where diamonds crystallize and the evolution of deep subducted crustal material. The empirical barometer studied here is based on the three major majoritic substitutions: 2Al3+ = Mg2+ + Si4+ (Mj), Mg2+ + Al3+ = Na1+ + Si4+ (NaSi), Mg2+ + Al3+ = Na1+ + Ti4+ (NaTi), and the secondary effect of chromium on the stability of Mj. The barometer was calibrated against experiments conducted in the multi-anvil apparatus between pressures of 6 and 16 GPa and temperatures of 1000 to 1400 °C. In order to expand the applicability to a wide range of compositions experiments were performed in three different mafic compositions and in one pyroxenitic composition. Moreover, existing experimental data in mafic and ultramafic systems, including mid-ocean ridge basalts, kimberlite, komatiite and peridotite bulk compositions were included in the calibration covering pressures from 6 to 20 GPa and temperatures from 900 to 2200 °C. Applying the geobarometer to natural majoritic diamond inclusions reveals clearly that eclogitic and pyroxenitic inclusions form dominantly at conditions near the top of the transition zone (300-400 km). Peridotitic inclusions, however, have formed generally at shallower depths ~200 km within the Earth’s upper mantle. This may reflect the differences expected for the oxygen fugacity between peridotitic and eclogitic/pyroxenitic rocks. If diamonds form through the reduction of carbonate or CO2 bearing melts then most peridotitic rocks would be already within the diamond stability field by depths of 200 km. At greater pressures carbon would remain immobilized as diamond and there is no mechanism by which new diamonds can form. Eclogitic rocks formed by the subduction of oceanic crust, however, should form an intrinsically more oxidized environment that remains within the carbonate stability field to much higher pressures. The diamond stability field would be eventually reached, however, due to either the effect of pressure on controlling Fe3+/Fe2+ equilibria or due to partial melting, which would preferentially remove ferric iron and lower the Fe3+/?Fe of the residue, on which the oxygen fugacity is mainly dependent. In fact deep partial melting as slabs heat up may be the mechanism by which both the local oxygen fugacity is lowered, carbon is mobilized and pyroxenite rocks are formed, with the latter occurring through reaction with the surrounding peridotite. The third project was focused on the elasticity of garnet solid solutions formed from eclogitic compositions. Garnet is an important mineral because it is a major phase in the upper mantle and dominates mafic rocks at these conditions. The elastic behavior of garnet solid solutions plays a role in the interpretation of seismic data and is important for estimating the density contrast between subducting slabs and the surrounding mantle. High-precision single-crystal X-ray diffraction measurements at high pressure have been conducted on three different ternary garnet solid solutions with varying chemical composition in order to examine possible non-ideal contributions to the volume and compressibility of garnet solid solutions. Furthermore one experiment has been conducted at high pressures and high temperatures to examine the effect of temperature on the elasticity of complex garnet solid solutions. Experimental results reveal that the concentration of the almandine (Fe3Al2Si3O12) component has a significant effect on the elasticity, whereby 10 - 20 mole% of almandine is sufficient to overprint the previously reported minima of the bulk modulus along the pyrope grossular join. It has also been shown that minor compositional variations of Ca and Mg within the Mg Fe Ca garnet ternary are not resolvable within the analytical errors. Therefore, the two eclogitic samples have similar bulk moduli within the analytical uncertainties. In contrast to previous studies, no evidence was found that garnets have a K’ significantly different from 4. The high-temperature experiment revealed that the relatively small fraction of almandine in a solid solution increased the softening of garnet with temperature. Finally, the experimental volumes and calculated densities have been compared to the self-consistent thermodynamic model of Stixrude and Lithgow-Bertelloni (2005, 2011). The comparison clearly reveals that volume and elastic properties cannot be linearly interpolated as a function of composition. Moreover, it has been shown that the excess properties vary not only as a function of composition and pressure, but also as a function of temperature. The final project is focused on the partitioning of fluorine (F) between garnet, clinopyroxene, and silicate melt within eclogitic compositions. Fluorine is the most abundant halogen on Earth and plays an important role in the formation of ultrapotassic lithologies, i.e. lamproites that contain several wt.% F, in contrast to the average lithospheric mantle that contains only tens of µg/g F. The cycling and partitioning behavior of fluorine in the Earth’s mantle are not well understood. High-pressure experiments have been conducted in the multi-anvil apparatus to obtain mineral-melt partition coefficients between garnet, clinopyroxene, and coexisting silicate melt of fluorine in a mafic system under conditions of the Earth’s upper mantle. The results show that mafic crust can host significantly more fluorine than the surrounding ultramafic mantle, due to the much higher proportion of clinopyroxene and its high fluorine partition coefficient of D_F^(clinopyroxene/melt)= 0.057 - 0.074. Combining the fluorine partitioning data with water partitioning data yields a plausible process to generate lamproitic magmas with a high F/H2O ratio. The enrichment of fluorine relative to H2O is triggered by multiple episodes of small degree melting which deplete the residual more in H2O than in fluorine, caused by the approximately three times smaller mineral-melt partition coefficients of H2O.
DS201503-0134
2015
Beyer, C., Frost, D.J., Miyajima, N.Experimental calibration of a garnet-clinopyroxene geobarometer for mantle eclogites.Contributions to Mineralogy and Petrology, Vol. 169, 21p.MantleGeobarometry - eclogites

Abstract: Thermodynamic parameters have been calibrated for a geobarometer suitable for use on eclogitic mantle xenoliths. The barometer is based on the incorporation of tetrahedrally coordinated aluminum in clinopyroxene coexisting with garnet and has been calibrated using the results of piston cylinder and multi-anvil experiments performed between pressures of 3 and 7 GPa and temperatures from 1,200 to 1,550 °C. Starting materials were hydrous and anhydrous synthetic mixtures of basaltic bulk compositions that yielded homogeneous bimineralic garnet-clinopyroxene phase assemblages. The experimental data set was expanded by employing results from previous experimental studies conducted in eclogitic systems, which widened the range of applicable conditions and compositions. The calibration reproduces experimental pressures of bimineralic eclogite assemblages, in addition to SiO2-saturated and kyanite-bearing eclogites, to within 0.4 GPa at the 95 % confidence interval. The barometer was then used to examine equilibration pressures recorded by natural mantle eclogites from various xenolith locations covering a wide pressure, temperature, and compositional range.
DM201508-0460
2015
Biesheuver, T.The missing diamond shortage.Bloomberg.news, July 3, 3p.GlobalNews item - markets
DS201512-1898
2015
Blacklock, S.Ekati diamond mine UAVs.43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 18.Canada, Northwest TerritoriesDeposit - Ekati

Abstract: Dominion Diamond Ekati Corporation (DDEC) purchased two unmanned aerial vehicles (UAV's) in 2014 to assist in surveying the active open pits and kimberlite stockpiles at the mine. UAV technology has allowed the team to survey various aspects of the mine in a safer and more accurate. manner. Along with making day to day work more efficient, DDEC surveying now has the ability to complete various other requests from departments at the mine. These include; large area photographs of lay downs, new road alignments, projects and environmental areas of interest.
DS201504-0185
2015
Block, S., Ganne, J., Baratoux, A.Z., Parra-Avila, L.A., Jessell, M., Ailleres, L., Siebenaller, L.Petrological and geochronological constraints on lower crust exhumation during Paleoproterozoic (Eburnean) Orogeny, NW Ghana, West African craton.Journal of Metamorphic Geology, Vol. 33, 5, pp. 463-494.Africa, GhanaGeochronology

Abstract: New petrological and geochronological data are presented on high-grade ortho- and paragneisses from northwestern Ghana, forming part of the Paleoproterozoic (2.25-2.00 Ga) West African Craton. The study area is located in the interference zone between N-S and NE--SW-trending craton-scale shear zones, formed during the Eburnean orogeny (2.15-2.00 Ga). High-grade metamorphic domains are separated from low-grade greenstone belts by high-strain zones, including early thrusts, extensional detachments and late-stage strike-slip shear zones. Paragneisses sporadically preserve high-pressure, low-temperature (HP-LT) relicts, formed at the transition between the blueschist facies and the epidote-amphibolite sub-facies (10.0-14.0 kbar, 520-600 °C), and represent a low (~15 °C km?1) apparent geothermal gradient. Migmatites record metamorphic conditions at the amphibolite-granulite facies transition. They reveal a clockwise pressure-temperature-time (P-T-t) path characterized by melting at pressures over 10.0 kbar, followed by decompression and heating to peak temperatures of 750 °C at 5.0-8.0 kbar, which fit a 30 °C km?1 apparent geotherm. A regional amphibolite facies metamorphic overprint is recorded by rocks that followed a clockwise P-T-t path, characterized by peak metamorphic conditions of 7.0-10.0 kbar at 550-680 °C, which match a 20-25 °C km?1 apparent geotherm. These P-T conditions were reached after prograde burial and heating for some rock units, and after decompression and heating for others. The timing of anatexis and of the amphibolite facies metamorphic overprint is constrained by in-situ U-Pb dating of monazite crystallization at 2138 ± 7 and 2130 ± 7 Ma respectively. The new data set challenges the interpretation that metamorphic breaks in the West African Craton are due to diachronous Birimian ‘basins’ overlying a gneissic basement. It suggests that the lower crust was exhumed along reverse, normal and transcurrent shear zones and juxtaposed against shallow crustal slices during the Eburnean orogeny. The craton in NW Ghana is made of distinct fragments with contrasting tectono-metamorphic histories. The range of metamorphic conditions and the sharp lateral metamorphic gradients are inconsistent with ‘hot orogeny’ models proposed for many Precambrian provinces. These findings shed new light on the geodynamic setting of craton assembly and stabilization in the Paleoproterozoic. It is suggested that the metamorphic record of the West African Craton is characteristic of Paleoproterozoic plate tectonics and illustrates a transition between Archean and Phanerozoic orogens.
DS201502-0042
2015
Bloodworth, A.The high stakes race to satisfy our need for the scarcest metals on Earth. Book by K. Veronese Publ. PrometheusNature, Vol. 517, 7533, Jan. 8, pp. 142-143.GlobalBook review - REE
DM201502-0461
2015
BloombergX-ray scanners ordered by Debswana to catch Botswana gem thieves. Jwaneng, Orapa, Letlhakane and Damtshaa.bloomberg.com, Jan. 6, 1p.Africa, BotswanaNews item - Debswana
DM201502-0462
2015
BloombergIsrael gem buyers scared of De Beers profit squeeze. bloomberg.com, Jan. 21, 1p.Europe, IsraelNews item - De Beers
DM201502-0463
2015
BloombergNamibia resumes diamond sales talks with Anglo's De Beers unit. bloomberg.com, Jan. 22, 1p.Africa, NamibiaNews item - Namdeb
DM201509-0464
2015
BloombergWant to make a diamond in just 10 weeks? Use a microwave.bloomberg.com, Aug. 27, 2p.TechnologyNews item - synthetics
DM201512-2214
2015
BloombergDiamonds aren't forever for Botswana as mining boom fades.bloomberg.com, Nov. 5, 1p.Africa, BotswanaNews item - economics
DM201512-2215
2015
BloombergWas billionaire Steinmetz betrayed by CEO over diamond mine? Koidubloomberg.com, Nov. 11, 5p.Africa, Sierra LeoneNews item - Steinmetz
DM201509-1999
2015
Bluedax.comRough market report: July sight - is the system bankrupt.Idex online, July 26, 2p.GlobalNews item - sights
DS201512-1899
2015
Bluemel, B., Dunn, C., Hart, C., Leijd, M.Biogeochemical expressions of buried REE mineralization at Norra Karr, southern Sweden.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov. 13-14, pp. 231-240.TechnologyRare earths

Abstract: Biogeochemical exploration is an effective but underutilized method for delineating covered mineralization. Plants are capable of accumulating rare earth elements (REEs) in their tissue, and ferns (pteridophytes) are especially adept because they are one of the most primitive land plants, therefore lack the barrier mechanisms developed by more evolved plants. The Norra Kärr Alkaline Complex, located in southern Sweden approximately 300km southwest of Stockholm, is a peralkaline nepheline syenite enriched in heavy rare earth elements (HREEs). The deposit, roughly 300m wide, 1300m long, and overlain by up to 4 m of Quaternary sediments, has been well-defined by diamond drilling. The inferred REE mineral resource, over 60 million tonnes averaging 0.54% Total Rare Earth Oxide (TREO), is dominantly hosted within the pegmatitic “grennaite” unit, a eudialyte-catapleiite-aegerine nepheline syenite. Vegetation and soil samples were collected from the surficial environment above Norra Kärr to address four key questions: which plant species is the most effective biogeochemical exploration medium; what are the annual and seasonal REE variations in that plant; how do the REEs move through the soil profile; and into which part of the plant are they concentrated. Athyrium filix-femina (lady fern) has the highest concentration of LREEs and HREEs (up to 125.17ppm Ce and 1.03ppm Dy) in its dry leaves; however, there is better contrast between background and anomalous areas in Dryopteris filix-mas (wood fern), which makes it the preferred biogeochemical sampling medium. The REE content in all fern species was shown to decrease from root > frond > stem, and chondrite normalized REE patterns within the plant displayed preferential fractionation of the LREEs in the fronds relative to the roots. Samples collected from an area directly overlying the deposit had up to five times greater HREE content (0.74ppm Dy) in August than the same plants did in June (0.14ppm Dy). The elevated REE content and distinct contrast to background demonstrate that biogeochemical sampling is an effective method for REE exploration in this environment.
DC201506-1403
2015
BlueRock Diamonds Plc.BlueRock Diamonds' Kareevlei plant delayed by crusher commissioning.BlueRock Diamonds Plc., May 1, 1p.Africa, South AfricaNews item - press release
DC201507-1404
2015
BlueRock Diamonds plc.Blue Rock Diamonds sells 116 carat parcel for average of USD440 per carat.Bluerock Diamonds plc., June 25, 1p.Africa, South AfricaNews item - press release
DC201511-2370
2015
BlueRock Diamonds plc.Interim results .. Summary Kareevlei Wes kimberlite.BlueRock Diamonds plc., Sept. 30, 3p.Africa, South AfricaNews item - press release
DC201512-2417
2015
BlueRock Diamonds plc.Finalization of contract with Diacar and operational update.. KareevleiBlueRock Diamonds Plc, Nov. 5, 1p.Africa, South AfricaNews item - press release
DS201509-0385
2015
Boger, S.D., Hirdes, W., Ferreira, C.A.M., Jenett, T., Dallwig, R., Fanning, C.M.The 580-520 Ma Gondwana suture of Madagascar and its continuation into Antarctica and Africa.Gondwana Research, Vol. 28, pp. 1048-1060.Africa, MadagascarTectonics

Abstract: U-Pb age data from southwest Madagascar provide a compelling case that the pre-Gondwana Indian plate was stitched with the arc terranes of the Arabian Nubian Shield along a suture that closed between 580 Ma and 520 Ma. The key observations supportive of this interpretation are: (1) metamorphism dated to 630-600 Ma is manifested only on the west side of the suture in rocks that have affinities with the oceanic and island arc terranes of the Arabian Nubian Shield, or which represent continental rocks welded to these terranes prior to the amalgamation of Gondwana, and (2) orogenesis at 580-520 Ma is manifest in rocks on both sides of the suture, an observation taken to mark the timing of collision and to reflect spatial continuity across the suture. In southwest Madagascar the distribution of metamorphic ages places the suture along the Beraketa high-strain zone, the tectonic boundary between the Androyen and Anosyen domains. Similar age relationships allow for the extrapolation of this tectonic boundary into both East Antarctica and Africa.
DS201502-0043
2015
Bogina, M., Zlobin, V., Sharkov, E., Chistyakov, A.Petrogenesis of siliceous high-Mg series rocks as exemplified by the Early Paleoproterozoic mafic volcanic rocks of the Eastern Baltic Shield: enriched mantle versus crustal contamination.Economic Geology Research Institute 2015, Vol. 17,, #3510, 1p. AbstractRussiaPlume geodynamics

Abstract: The Early Paleoproterozoic stage in the Earth's evolution was marked by the initiation of global rift systems, the tectonic nature of which was determined by plume geodynamics. These processes caused the voluminous emplacement of mantle melts with the formation of dike swarms, mafic-ultramafic layered intrusions, and volcanic rocks. All these rocks are usually considered as derivatives of SHMS (siliceous high-magnesian series). Within the Eastern Baltic Shield, the SHMS volcanic rocks are localized in the domains with different crustal history: in the Vodlozero block of the Karelian craton with the oldest (Middle Archean) crust, in the Central Block of the same craton with the Neoarchean crust, and in the Kola Craton with a heterogeneous crust. At the same time, these rocks are characterized by sufficiently close geochemical characteristics: high REE fractionation ((La/Yb)N = 4.9-11.7, (La/Sm)N=2.3-3.6, (Gd/Yb)N =1.66-2.74)), LILE enrichment, negative Nb anomaly, low to moderate Ti content, and sufficiently narrow variations in Nd isotope composition from -2.0 to -0.4 epsilon units. The tectonomagmatic interpretation of these rocks was ambiguous, because such characteristics may be produced by both crustal contamination of depleted mantle melts, and by generation from a mantle source metasomatized during previous subduction event. Similar REE patterns and overlapping Nd isotope compositions indicate that the studied basaltic rocks were formed from similar sources. If crustal contamination en route to the surface would play a significant role in the formation of the studied basalts, then almost equal amounts of contaminant of similar composition are required to produce the mafic rocks with similar geochemical signatures and close Nd isotopic compositions, which is hardly possible for the rocks spaced far apart in a heterogeneous crust. This conclusion is consistent with analysis of some relations between incompatible elements and their ratios. In particular, the rocks show no correlation between Th/Ta and La/Yb, (Nb/La)pm ratio and Th content, and eNd and (Nb/La)N ratio. At the same time, some correlation observed in the eNd-Mg# and (La/Sm)N-(Nb/La)N diagrams in combination with the presence of inherited zircons in the rocks does not allow us to discard completely the crustal contamination. Examination of Sm/Yb-La/Sm relations and the comparison with model melting curves for garnet and spinel lherzolites showed that the parental melts of the rocks were derived by 10-30% mantle melting at garnet-spinel facies transition. Two stage model can be proposed to explain such remarkable isotope-geochemical homogeneity of the mafic volcanic rocks over a large area: (1) ubiquitous emplacement of large volumes of sanukitoid melts in the lower crust of the shield at 2.7 Ga; (2) underplating of plume-derived DM melts at the crust-mantle boundary, melting of the lower crust of sanukitoid composition, and subsequent mixing of these melts with formation of SHMS melts at 2.4 Ga. A simple mixing model showed that in this case the Nd isotope composition of obtained melts remained practically unchanged at variable amounts of contaminant (up to 30%). This work was supported by the RFBR no. 14-05-00458.
DS201502-0044
2015
Bonetto, S., Facello, A., Ferrero, A-M., Umili, G.A tool for semi-automatic linear feature detection based on DTM.Computers & Geosciences, Vol. 75, pp. 1-12.TechnologyNot specific to diamonds
DM201502-0465
2015
Bonner, H.Hason Stevens: why I believe diamonds are a good 5 year play.Sprottglobal.com, Jan.12, 4p. GraphsGlobalNews item - demand
DS201511-1825
2014
Bosshart, G., Chapman, J.The Argyle diamond mine in transition from open pit to underground extraction.Australian Gemmologist, Vol. 24, 1, pp. 4-8.AustraliaDeposit - Argyle

Abstract: At the Argyle diamond mine in Western Australia, an underground project is using block caving techniques to reach deeper portions of the diamondiferous lamproite. This program could extend the life of the mine to 2018. It entails a high level of automation, as well as measures to combat monsoonal downpours.
DC201504-1405
2015
Botswana Diamonds plc.Field exploration update - Orapa, Botswana ( Alrosa). PL 206,207,210Botswana Diamonds plc., Mar. 5, 2p.Africa, BotswanaNews item - press release
DC201504-1406
2015
Botswana Diamonds plc.New licence in Orapa, Botswana. PL 085/2015 to Atlas Minerals ( the local subsidiary company) Botswana Diamonds plc., Mar. 24, 1p.Africa, BotswanaNews item - press release
DC201505-1407
2015
Botswana Diamonds plc.Interim results for the six months to 31 December 2014. JV AlrosaBotswana Diamonds plc., Mar. 27, 3p.Africa, BotswanaNews item - press release
DC201505-1408
2015
Botswana Diamonds plc.Botswana Diamonds Plc. Fundraising of lbs 282,500.Botswana Diamonds plc., Mar. 31, 1p.Africa, BotswanaNews item - press release
DC201505-1409
2015
Botswana Diamonds plc.Botswana Diamonds expands exploration with three new licences in the central part of Botswana. ( Alrosa)Botswana Diamonds plc., Apr. 15, 1p.Africa, BotswanaNews item - press release
DC201507-1410
2015
Botswana Diamonds plc.Exploration update - June 2015. Field work .. Anomaly PL210/2014 drill programme and more work on PL206 & 207. AlrosaBotswana Diamonds plc., June 18, 1p.Africa, BotswanaNews item - press release
DC201510-2331
2015
Botswana Diamonds plc.Update on exploration in Botswana. Orapa region .. PL 206, PL 210, PL 085 and then on to Gope region.Botswana Diamonds plc, Sept. 3, 2p.Africa, BotswanaNews item - press release
DC201510-2332
2015
Botswana Diamonds plc.Exploration update: Joint Venture with Alrosa, drilling starting on PL210, work on new Gope prospecting licencesBotswana Diamonds plc, Sept. 11, 2p.Africa, BotswanaNews item - Botswana Diamonds, Alrosa
DC201511-2371
2015
Botswana Diamonds plc.Exploration update on Licence PL 210 drilling in Orapa.Botswana Diamonds plc., Oct. 7, 1p.Africa, BotswanaNews item - press release
DC201511-2372
2015
Botswana Diamonds plc.New prospecting licence awarded in the Orapa region of Botswana PL260/2015 to Sunland Minerals ( JV Alrosa)Botswana Diamonds plc., Oct. 9, 1p.Africa, BotswanaNews item - press release
DC201512-2418
2015
Botswana Diamonds plc.Preliminary results for the year ended 30 June 2015.Botswana Diamonds plc., Nov. 19, 13p.Africa, BotswanaNews item - press release
DS201503-0135
2015
Bouhifd, M.A., Boyet, M., Cartier, C., Hammouda, T., Bofan-Casanova, N., Devidal, J.L., Andrault, D.Superchondritic Sm/Nd ratio of the Earth: impact of Earth's core formation.Earth and Planetary Science Letters, Vol. 413, March 1, pp. 158-166.MantleGeochronology

Abstract: This study investigates the impact of Earth's core formation on the metal-silicate partitioning of Sm and Nd, two rare-earth elements assumed to be strictly lithophile although they are widely carried by the sulphide phases in reducing material (e.g. enstatite chondrites). The partition coefficients of Sm and Nd (DSmDSm and DNdDNd) between molten CI and EH chondrites model compositions and various Fe-rich alloys (in the Fe-Ni-C-Si-S system) have been determined in a multi-anvil between 3 and 26 GPa at various temperatures between 2073 and 2440 K, and at an oxygen fugacity ranging from 1 to 5 log units below the iron-wüstite (IW) buffer. The chemical compositions of the run products and trace concentrations in Sm and Nd elements were determined using electron microprobe and laser ablation inductively coupled plasma-mass spectrometry. Our results demonstrate the non-fractionation of Sm and Nd during the segregation of the metallic phases: the initial Sm/Nd ratio of about 1 in the starting materials yields precisely the same ratio in the recovered silicate phases after the equilibration with the metal phases at all conditions investigated in this study. In addition, DSmDSm and DNdDNd values range between 10?310?3 and 10?510?5 representing a low solubility in the metal. An increase of the partition coefficients is observed with decreasing the oxygen fugacity, or with an increase of S content of the metallic phase at constant oxygen fugacity. Thus, based on the actual Sm and Nd concentrations in the bulk Earth, the core should contain less than 0.4 ppb for Sm and less than 1 ppb for Nd. These estimates are three orders of magnitude lower than what would be required to explain the reported 142Nd excess in terrestrial samples relative to the mean chondritic value, using the core as a Sm-Nd complementary reservoir. In other words, the core formation processes cannot be responsible for the increase of the Sm/Nd ratio in the mantle early in Earth history.
DS201511-1826
2015
Boyd, O.S., Smalley, R., Zeng, Y.Crustal deformation in the New Madrid seismic zone and the role of postseismic processes.Journal of Geophysical Research, Vol. 120, 8, pp. 5782-5803.United States, ArkansasGeophysics - seismics

Abstract: Global Navigation Satellite System data across the New Madrid seismic zone (NMSZ) in the central United States over the period from 2000 through 2014 are analyzed and modeled with several deformation mechanisms including the following: (1) creep on subsurface dislocations, (2) postseismic frictional afterslip and viscoelastic relaxation from the 1811–1812 and 1450 earthquakes in the NMSZ, and (3) regional strain. In agreement with previous studies, a dislocation creeping at about 4 mm/yr between 12 and 20 km depth along the downdip extension of the Reelfoot fault reproduces the observations well. We find that a dynamic model of postseismic frictional afterslip from the 1450 and February 1812 Reelfoot fault events can explain this creep. Kinematic and dynamic models involving the Cottonwood Grove fault provide minimal predictive power. This is likely due to the smaller size of the December 1811 event on the Cottonwood Grove fault and a distribution of stations better suited to constrain localized strain across the Reelfoot fault. Regional compressive strain across the NMSZ is found to be less than 3?×?10?9/yr. If much of the present-day surface deformation results from afterslip, it is likely that many of the earthquakes we see today in the NMSZ are aftershocks from the 1811–1812 New Madrid earthquakes. Despite this conclusion, our results are consistent with observations and models of intraplate earthquake clustering. Given this and the recent paleoseismic history of the region, we suggest that seismic hazard is likely to remain significant.
DS201506-0257
2015
Bradley, D.The promise of perovskite ( solar)Chemistry Views, May 5, 2p.TechnologyEnergy
DS201502-0045
2014
Brazil diamond mapMap of diamonds from the Patos Meeting.Mapa Simposio APL Diamantes A3 QT.pdf, pdf available 12306KSouth America, BrazilDiamond locations in A.P.
DC201503-1411
2015
Brazil Minerals Inc.Receives title to 25% of a company with 10 mining concessions for diamond and gold. RST Recursos Minerals, Ltda.Brazil Minerals, Inc., Feb. 22, 1p.South America, BrazilNews item - press release
DC201504-1412
2015
Brazil Minerals Inc.Extinguishes 46% of convertible debt note.Brazil Minerals, Inc., Mar. 9, 1p.South America, BrazilNews item - press release
DC201505-1413
2015
Brazil Minerals Inc.Brazil Minerals, Inc. reports largest rough diamond & expected further cash flows from sand products.Brazil Minerals, Inc., Apr. 6, 1p.South America, BrazilNews item - press release
DC201506-1414
2015
Brazil Minerals Inc.Strong preliminary result for new diamond and gold area. Along the margins of Jequithonha River.Brazil Minerals, Inc., Apr. 27, 1p.South America, BrazilNews item - press release
DC201506-1415
2015
Brazil Minerals Inc.Brazil Minerals, Inc. completes first phase of geological assessment of new diamond & gold area. Jequitinhonha river.Brazil Minerals, Inc., May 26, 2p.South America, Brazil, Minas GeraisNews item - press release
DC201508-1416
2015
Brazil Minerals Inc.Brazil Minerals, Inc. receives environmental permit for mining in new diamond and gold area. Jequitinhonka River ( In land old course).Brazil Minerals, Inc., July 13, 1p.South America, BrazilNews item - press release
DC201509-1417
2015
Brazil Minerals Inc.Finishes second phase of geological assessment of new diamond and gold area & completes payment for its RST ownership position.Brazil Minerals, Inc., Aug. 3, 2p.South America, BrazilNews item - press release
DC201510-2333
2015
Brazil Minerals Inc.Brazil Minerals, Inc. provides general update. Comments on gravel potential.Brazil Minerals, Inc., Sept. 21, 1p.South America, BrazilNews item - press release
DC201512-2419
2015
Brazil Minerals Inc.Provides updates on new access road and agreement with investor group to purchase outstanding convertible debt. Brazil Minerals, Inc., Nov. 3, 1p.South America, BrazilNews item - press release
DS201507-0305
2015
Brett, R.C.The ascent of kimberlite: insights from olivine.Earth and Planetary Science Letters, Vol. 424, pp. 119-131.Canada, Northwest Territories, Africa, TanzaniaDeposit - Diavik, Igwisi Hills

Abstract: Olivine xenocrysts are ubiquitous in kimberlite deposits worldwide and derive from the disaggregation of mantle-derived peridotitic xenoliths. Here, we provide descriptions of textural features in xenocrystic olivine from kimberlite deposits at the Diavik Diamond Mine, Canada and at Igwisi Hills volcano, Tanzania. We establish a relative sequence of textural events recorded by olivine during magma ascent through the cratonic mantle lithosphere, including: xenolith disaggregation, decompression fracturing expressed as mineral- and fluid-inclusion-rich sealed and healed cracks, grain size and shape modification by chemical dissolution and abrasion, late-stage crystallization of overgrowths on olivine xenocrysts, and lastly, mechanical milling and rounding of the olivine cargo prior to emplacement. Ascent through the lithosphere operates as a "kimberlite factory" wherein progressive upward dyke propagation of the initial carbonatitic melt fractures the overlying mantle to entrain and disaggregate mantle xenoliths. Preferential assimilation of orthopyroxene (Opx) xenocrysts by the silica-undersaturated carbonatitic melt leads to deep-seated exsolution of CO2-rich fluid generating buoyancy and supporting rapid ascent. Concomitant dissolution of olivine produces irregular-shaped relict grains preserved as cores to most kimberlitic olivine. Multiple generations of decompression cracks in olivine provide evidence for a progression in ambient fluid compositions (e.g., from carbonatitic to silicic) during ascent. Numerical modelling predicts tensile failure of xenoliths (disaggregation) and olivine (cracks) over ascent distances of 2-7 km and 15-25 km, respectively, at velocities of 0.1 to >4 m?s?1. Efficient assimilation of Opx during ascent results in a silica-enriched, olivine-saturated kimberlitic melt (i.e. SiO2 >20 wt.%) that crystallizes overgrowths on partially digested and abraded olivine xenocrysts. Olivine saturation is constrained to occur at pressures <1 GPa; an absence of decompression cracks within olivine overgrowths suggests depths <25 km. Late stage (<25 km) resurfacing and reshaping of olivine by particle-particle milling is indicative of turbulent flow conditions within a fully fluidized, gas-charged, crystal-rich magma.
DS201509-0386
2015
Brey, G.P., Girnis, A.V., Bulatov, V.K., Hofer, H.E., Gerdes, A., Woodland, A.B.Reduced sediment melting at 7.5-12 Gpa: phase relations, geochemical signals and diamond nucleation.Contributions to Mineralogy and Petrology, Vol. 170, 25p.TechnologyExperimental petrology

Abstract: Melting of carbonated sediment in the presence of graphite or diamond was experimentally investigated at 7.5–12 GPa and 800–1600 °C in a multianvil apparatus. Two starting materials similar to GLOSS of Plank and Langmuir (Chem Geol 145:325–394, 1998) were prepared from oxides, carbonates, hydroxides and graphite. One mixture (Na-gloss) was identical in major element composition to GLOSS, and the other was poorer in Na and richer in K (K-gloss). Both starting mixtures contained ~6 wt% CO2 and 7 wt% H2O and were doped at a ~100 ppm level with a number of trace elements, including REE, LILE and HFSE. The near-solidus mineral assemblage contained a silica polymorph (coesite or stishovite), garnet, kyanite, clinopyroxene, carbonates (aragonite and magnesite-siderite solid solution), zircon, rutile, bearthite and hydrous phases (phengite and lawsonite at <9 GPa and the hydrous aluminosilicates topaz-OH and phase egg at >10 GPa). Hydrous phases disappear at ~900 °C, and carbonates persist up to 1000-1100 °C. At temperatures >1200 °C, the mineral assemblage consists of coesite or stishovite, kyanite and garnet. Clinopyroxene stability depends strongly on the Na content in the starting mixture; it remains in the Na-gloss composition up to 1600 °C at 12 GPa, but was not observed in K-gloss experiments above 1200 °C. The composition of melt or fluid changes gradually with increasing temperature from hydrous carbonate-rich (<10 wt% SiO2) at 800-1000 °C to volatile-rich silicate liquids (up to 40 wt% SiO2) at high temperatures. Trace elements were analyzed in melts and crystalline phases by LA ICP MS. The garnet-melt and clinopyroxene-melt partition coefficients are in general consistent with results from the literature for volatile-free systems and silicocarbonate melts derived by melting carbonated peridotites. Most trace elements are strongly incompatible in kyanite and silica polymorphs (D < 0.01), except for V, Cr and Ni, which are slightly compatible in kyanite (D > 1). Aragonite and Fe-Mg carbonate have very different REE partition coefficients (D Mst-Sd/L ~ 0.01 and D Arg/L ~ 1). Nb, Ta, Zr and Hf are strongly incompatible in both carbonates. The bearthite/melt partition coefficients are very high for LREE (>10) and decrease to ~1 for HREE. All HFSE are strongly incompatible in bearthite. In contrast, Ta, Nb, Zr and Hf are moderately to strongly compatible in ZrSiO4 and TiO2 phases. Based on the obtained partition coefficients, the composition of a mobile phase derived by sediment melting in deep subduction zones was calculated. This phase is strongly enriched in incompatible elements and displays a pronounced negative Ta-Nb anomaly but no Zr-Hf anomaly. Although all experiments were conducted in the diamond stability field, only graphite was observed in low-temperature experiments. Spontaneous diamond nucleation and the complete transformation of graphite to diamond were observed at temperatures above 1200-1300 °C. We speculate that the observed character of graphite-diamond transformation is controlled by relationships between the kinetics of metastable graphite dissolution and diamond nucleation in a hydrous silicocarbonate melt that is oversaturated in C.
DC201502-1418
2014
Britannia Mining Inc.Diamonds in transit to north east initiate precious stones commodities contract.Britannia Mining, Inc., Dec. 22, 1p.TechnologyNews item - press release
DC201505-1419
2015
Britannia Mining Inc.Announces two key hires for its diamond division ( Commodities trading division)Britannia Mining, Inc., Mar. 31, 1p.United StatesNews item - press release
DS201502-0046
2014
Brown, R., Summerfield, M., Gleadow, A., Gallagher, K., Carter, A., Beucher, R., Wildman, M.Intracontinental deformation in southern Africa during the Late Cretaceous.Journal of African Earth Sciences, Vol. 100, pp. 20-41.Africa, NamibiaGeothermometry

Abstract: Intracontinental deformation accommodated along major lithospheric scale shear zone systems and within associated extensional basins has been well documented within West, Central and East Africa during the Late Cretaceous. The nature of this deformation has been established by studies of the tectonic architecture of sedimentary basins preserved in this part of Africa. In southern Africa, where the post break-up history has been dominated by major erosion, little evidence for post-break-up tectonics has been preserved in the onshore geology. Here we present the results of 38 new apatite fission track analyses from the Damara region of northern Namibia and integrate these new data with our previous results that were focused on specific regions or sections only to comprehensively document the thermo-tectonic history of this region since continental break-up in the Early Cretaceous. The apatite fission track ages range from 449 ± 20 Ma to 59 ± 3 Ma, with mean confined track lengths between 14.61 ± 0.1 ?m (SD 0.95 ?m) to 10.83 ± 0.33 ?m (SD 2.84 ?m). The youngest ages (c. 80–60 Ma) yield the longest mean track lengths, and combined with their spatial distribution, indicate major cooling during the latest Cretaceous. A simple numerical thermal model is used to demonstrate that this cooling is consistent with the combined effects of heating caused by magmatic underplating, related to the Paraná-Etendeka continental flood volcanism associated with rifting and the opening of the South Atlantic, and enhanced erosion caused by major reactivation of major lithospheric structures within southern Africa during a key period of plate kinematic change that occurred in the South Atlantic and SW Indian ocean basins between 87 and 56 Ma. This phase of intraplate tectonism in northern Namibia, focused in discrete structurally defined zones, is coeval with similar phases elsewhere in Africa and suggests some form of trans-continental linkage between these lithospheric zones.
DS201507-0306
2015
Brushan, S.K.Geology of the Kamthai rare earth deposit. Journal of the Geological Society of India, Vol. 85, 5, pp. 537-546.India, RajasthanCalciocarbonatite

Abstract: A wide spectrum of calciocarbonatites and associated alkaline rocks are exposed around Kamthai, Rajasthan. The mineralogical studies exhibit a bimodal distribution of REE minerals. The southeastern block has carbocernaite and the eastern block has bastnaesite ± ancylite / synchysite as the dominant REE minerals followed by parisite and other accessory minerals. Calcite is the most abundant of the gangue phase, followed by biotite, albite, k-feldspar and iron oxide / hydroxide. Minor and trace gangue phases include pyrite, ilmenite, apatite, siderite, ankerite, amphibole, pyroxene, strontianite, barite, ilmenite / pyrophanite, celestine, clay minerals, sphalerite, pyrochlore, fluorite and Mn-rich phases including hollandite and Mn-Fe oxides. Calciocarbonatite occuring as intrusive veins, sills/dykes and plug, is perhaps a product of crystallization of a primary carbonatite melt generated at upper mantle. The first phase magmatic calciocarbonatite is alvikite type, rich in carbocernaite whereas second hydrothermal phase, sovite type, is enriched in bastnaesite. The absence of supergene activity and minerals (crandalite, florencite, gorceixite) indicate minor role of secondary enrichment. A rift-related mechanism, thermal equivalent to Deccan flood basalt (65±2 Ma), invoking "Reunion plume - continental hot spot" might have triggered Tertiary alkaline magmatism.
DS201507-0307
2015
Bucher, K., Stober, I., Muller-Sigmund, H.Weathering crusts on peridotite.Contributions to Mineralogy and Petrology, Vol. 169, pp. 52-Europe, SpainDeposit - Ronda

Abstract: Chemical weathering of dark-green massive peridotite, including partly serpentinized peridotite, produces a distinct and remarkable brown weathering rind when exposed to the atmosphere long enough. The structure and mineral composition of crusts on rocks from the Ronda peridotite, Spain, have been studied in some detail. The generic overall weathering reaction serpentinized peridotite + rainwater = weathering rind + runoff water describes the crust-forming process. This hydration reaction depends on water supply from the outcrop surface to the reaction front separating green peridotite from the brown crust. The reaction pauses after drying and resumes at the front after wetting. The overall net reaction transforms olivine to serpentine in a volume-conserving replacement reaction. The crust formation can be viewed as secondary serpentinization of peridotite that has been strongly altered by primary hydrothermal serpentinization. The reaction stoichiometry of the crust-related serpentinization is preserved and reflected by the composition of runoff waters in the peridotite massif. The brown color of the rind is caused by amorphous Fe(III) hydroxide, a side product from the oxidation of Fe(II) released by the dissolution of fayalite component in olivine.
DS201512-1900
2015
Burnham, A.D., Thomson, A.R., Bulanova, G.P., Kohn, S.C., Smith, C.B., Walter, M.J.Stable isotope evidence for crustal recycling as recorded by superdeep diamonds.Earth and Planetary Science Letters, Vol. 432, pp. 374-380.South America, BrazilDeposit - Juina-5, Collier-4, Machado River

Abstract: Sub-lithospheric diamonds from the Juina-5 and Collier-4 kimberlites and the Machado River alluvial deposit in Brazil have carbon isotopic compositions that co-vary with the oxygen isotopic compositions of their inclusions, which implies that they formed by a mixing process. The proposed model for this mixing process, based on interaction of slab-derived carbonate melt with reduced (carbide- or metal-bearing) ambient mantle, explains these isotopic observations. It is also consistent with the observed trace element chemistries of diamond inclusions from these localities and with the experimental phase relations of carbonated subducted crust. The 18O-enriched nature of the inclusions demonstrates that they incorporate material from crustal protoliths that previously interacted with seawater, thus confirming the subduction-related origin of superdeep diamonds. These samples also provide direct evidence of an isotopically anomalous reservoir in the deep (?350 km) mantle.
DS201504-0186
2015
Burtseva, M.V., Ripp, G.S., Posokhov, V.F., Zyablitsev, A.Yu., Murzintseva, A.E.The sources of fluids for the formation of nephritic rocks of the southern folded belt of the Siberian craton.Doklady Earth Sciences, Vol. 460, 1, pp. 82-86.Russia, SiberiaAlkaline rocks, nephrites
DM201502-0466
2015
Business StandardRio Tinto strikes diamonds in Bundelkhand's Bunder.business standard.com, Jan. 8, 1p.IndiaNews item - Rio Tinto
DS201502-0047
2015
Buslov, M.M., Dobretsov, N.L., Vovna, G.M., Kiselev, V.I.Structural location, composition, and geodynamic nature of diamond bearing metamorphic rocks of the Kokchetav subduction-collision zone of the Central Asian Fold Belt ( Northern Kazakhstan).Russian Geology and Geophysics, Vol. 56, 1-2, pp. 64-80.Russia, KazakhstanKokchetav massif

Abstract: We present data on different aspects of geology, mineralogy, petrology, geochemistry, and geochronology of diamond-bearing metamorphic rocks of the Kumdy-Kol terrane, which show the similarity of their protolith to the sedimentary rocks of the Kokchetav microcontinent. The structural location of the studied objects in the accretion-collision zone evidences that the subduction of the Kokchetav microcontinent beneath the Vendian-Cambrian Ishim-Selety island arc is the main mechanism of transport of graphite-bearing terrigenous-carbonate rocks to zones of their transformation into diamond-bearing metamorphic rocks. The sedimentary rocks of the Kokchetav microcontinent, which are enriched in graphite and iron sulfides and carbonates, contain all components necessary for diamond crystallization in deep-seated subduction zone. This is in agreement with the experimental data and the compositions of fluid-melt inclusions in the minerals of diamond-bearing rocks.
DS201504-0187
2015
Bussweiler, Y., Foley, S.F., Prelevic, D., Jacob, D.E.The olivine macrocryst problem: new insights from minor and trace element compositions of olivine from Lac de Gras kimberlites, Canada.Lithos, Vol. 220-223, pp. 238-252.Canada, Northwest TerritoriesDeposit - Ekati field

Abstract: This study presents detailed petrographical and geochemical investigations on remarkably fresh olivines in kimberlites from the EKATI Diamond Mine- located in the Tertiary/Cretaceous Lac de Gras kimberlite field within the Slave craton of Canada. Olivine, constituting about 42 vol.% of the analyzed samples, can be divided into two textural groups: (i) macrocrystic olivines, > 100 ?m sub-rounded crystals and (ii) groundmass olivines, < 100 ?m subhedral crystals. Olivines from both populations define two distinct chemical trends; a “ "mantle trend" with angular cores, showing low Ca (< 0.1 wt.% CaO) and high Ni (0.3-0.4 wt.% NiO) at varying Mg# (0.86-0.93), contrasts with a "melt trend" typified by thin (< 100 ?m) rims with increasing Ca (up to 1.0 wt.% CaO) and decreasing Ni (down to 0.1 wt.% NiO) contents at constant Mg# (~ 0.915). These findings are in agreement with recent studies suggesting that virtually all olivine is composed of xenocrystic (i.e. mantle-related) cores with phenocrystic (i.e. melt-related) overgrowths, thereby challenging the traditional view that the origin of kimberlitic olivine can be distinguished based on size and morphology. The two main trends can be further resolved into sub-groups refining the crystallization history of olivine; the mantle trend indicates a multi-source origin that samples the layered lithosphere below the Slave craton, whereas the melt trend represents multi-stage crystallization comprising a differentiation trend starting at mantle conditions and a second trend controlled by the crystallization of additional phases (e.g. chromite) and changing magma conditions (e.g. oxidation). These trends are also seen in the concentrations of trace elements not routinely measured in olivine (e.g. Na, P, Ti, Co, Sc, Zr). Trace element mapping with LA-ICP-MS reveals the distribution of these elements within olivine grains. The trace element distribution between the two trends appears to be consistent with phenocrystic olivine overgrowths mainly originating from dissolved orthopyroxene, showing enrichment in Zr, Ga, Nb, Sc, V, P, Al, Ti, Cr, Ca and Mn in the melt trend. In a sample of magmatic kimberlite from the Leslie pipe, the amount of xenocrystic and phenocrystic olivine is estimated to be around 23 vol.% and 19 vol.%, respectively. Subtraction of this xenocrystic olivine from the Leslie bulk composition, aimed at estimating the parental kimberlite melt, results in a minor decrease of Mg# (by about 0.01) and SiO2 content (by about 3 wt.%), whereas CaO increases (by about 3 wt.%).
DS201512-1901
2015
Butler, R.Destructive sampling ethics… protect natural sites, rock outcrops… code of ethics.Nature Geoscience, Vol. 8, 11, pp. 817-818.GlobalCSR
DS201511-1827
2015
Cai, Y-C., Fan, H-R., Santsh, M., Hu, F-F., Yang, K-F, Hu, Z.Subduction related metasomatism of the lithospheric mantle beneath the southeastern North Chin a Craton: evidence from mafic to intermediate dykes in the northern Sulu orogen.Tectonophysics, Vol. 659, pp. 137-151.ChinaSulu orogen - dykes

Abstract: The widespread mafic to intermediate dykes in the northern Sulu orogen provide important constrains on mantle source characteristics and geodynamic setting. Here we present LA-ICPMS zircon U-Pb ages which indicate that the dykes were emplaced during Early Cretaceous (~ 113-108 Ma). The rocks show SiO2 in the range of 46.2 to 59.5 wt.% and alkalic and shoshonitic affinity with high concentrations of MgO (up to 7.6 wt.%), Cr (up to 422 ppm) and Ni (up to 307 ppm). They are enriched in light rare earth elements LREE (La, Ce, Pr, Nd, Sm and Eu) and large ion lithophile elements (LILE, Rb, Sr, Ba, U and Th) and show strong depletion in high field strength elements (HFSE, Nb, Ta, Ti and P). The dykes possess uniformly high (87Sr/86Sr)i (0.70824-0.70983), low ?Nd(t) (? 14.0 to ? 17.4) and (206Pb/204Pb)i (16.66-17.02) and negative ?Hf(t) (? 23.5 to ? 13.7). Our results suggest that the source magma did not undergo any significant crustal contamination during ascent. The systematic variation trends between MgO and major and trace elements suggest fractionation of olivine and clinopyroxene. The highly enriched mantle source for these rocks might have involved melts derived from the subducted lower crust of Yangtze Craton that metasomatized the ancient lithospheric mantle of the North China Craton.
DS201509-0387
2015
Campeny, M., Kamenetsky, V.S., Melgarejo, J.C., Mangas, J., Manuel, J., Alfonso, P., Kamenetsky, M.B., Bambi, A.C.J.M., Goncalves, A.O.Carbonatitic lavas in CatAnd a ( Kwanza Sul, Angola): mineralogical and geochemical constraints on the parental melt.Lithos, Vol. 232, pp. 1-11.Africa, AngolaCarbonatite

Abstract: A set of small volcanic edifices with tuff ring and maar morphologies occur in the Catanda area, which is the only locality with extrusive carbonatites reported in Angola. Four outcrops of carbonatite lavas have been identified in this region and considering the mineralogical, textural and compositional features, we classify them as: silicocarbonatites (1), calciocarbonatites (2) and secondary calciocarbonatites produced by the alteration of primary natrocarbonatites (3). Even with their differences, we interpret these lava types as having been a single carbonatite suite related to the same parental magma. We have also estimated the composition of the parental magma from a study of melt inclusions hosted in magnetite microphenocrysts from all of these lavas. Melt inclusions revealed the presence of 13 different alkali-rich phases (e.g., nyerereite, shortite, halite and sylvite) that argues for an alkaline composition of the Catanda parental melts. Mineralogical, textural, compositional and isotopic features of some Catanda lavas are also similar to those described in altered natrocarbonatite localities worldwide such as Tinderet or Kerimasi, leading to our conclusion that the formation of some Catanda calciocarbonatite lavas was related to the occurrence of natrocarbonatite volcanism in this area. On the other hand, silicocarbonatite lavas, which are enriched in periclase, present very different mineralogical, compositional and isotopic features in comparison to the rest of Catanda lavas. We conclude that its formation was probably related to the decarbonation of primary dolomite bearing carbonatites.
DC201506-1420
2015
Canadian International Minerals Inc.Kimberlite indicator minerals recovered from Pikoo East properties.Canadian International Minerals Inc., Apr. 27, 2p.Canada, SaskatchewanNews item - press release
DC201509-1421
2015
Canadian International Minerals Inc.Acquires Arc diamond project. Southwest of Pikoo field. ( Mountain Province and Consolidated Pine Channel Gold previous worked)Canadian International Minerals Inc., Aug. 21, 2p.Canada, SaskatchewanNews item - press release
DC201510-2334
2015
Canadian International Minerals Inc.Fixed wing magnetic survey to be flown on Pikoo East properties.Canadian International Minerals Inc., Sept. 14, 2p.Canada, SaskatchewanNews item - press release
DC201510-2335
2015
Canadian Mining JournalDiamonds, NWT, and how the Polar Bear got in there. Logo and diamond policy framework mentions Gahcho Kue.Canadain Mining Journal, Sept. p. 8.Canada, Northwest TerritoriesNews item - Diamond Policy Framework
DC201504-1422
2015
CanAlaska Uranium Ltd.CanAlaska Uranium reports on multiple projects Maguire Lake.CanAlaska Uranium Ltd., Mar. 2, 1p.Canada, ManitobaNews item - press release
DC201502-1423
2015
Canterra Minerals CorporationCanterra stakes the Rex property, NT.Canterra Minerals Corporation, Jan. 20, 1p.Canada, Northwest TerritoriesNews item - press release
DC201503-1424
2015
Canterra Minerals CorporationCanterra receives preliminary gravity survey dat a for Marlin project, southern Slave, NT.Canterra Minerals Corporation, Jan. 26, 2p.Canada, Northwest TerritoriesNews item - press release
DC201507-1425
2015
Canterra Minerals CorporationCanterra provides exploration update on southern Slave properties, NWT. Canterra Minerals Corporation, June 17, 2p.Canada, Northwest TerritoriesNews item - press release
DC201508-1426
2015
Canterra Minerals CorporationCanterra announces $ 1 million financing 0.06 cts and flow through unit @ 0.08ctsCanterra Minerals Corporation, July 8, 1p.Canada, Northwest Territories, AlbertaNews item - press release
DC201510-2336
2015
Canterra Minerals CorporationCanterra commences exploration program on South Slave properties, NT.Canterra Minerals Corporation, Sept. 3, 1p.Canada, Northwest TerritoriesNews item - press release
DC201512-2420
2015
Canterra Minerals CorporationCanterra completes exploration program, appoints new director and extends financing. Hilltop property Great Slave areaCanterra Minerals Corporation, Nov. 17, 1p.Canada, Northwest TerritoriesNews item - press release
DS201502-0048
2015
Cathles, L.M.Future Rx: optimism, preparation, acceptance of risk.In: Ore deposits of an evolving Earth, Geological Society of London,, Special Publication no. 393, pp. 303-324.GlobalEconomics
DS201502-0049
2015
Cawood, P., Hawkesworth, C.J.Temporal relations between mineral deposits and global tectonic cycles.In: Ore deposits of an evolving Earth, Geological Society of London,, Special Publication no. 393, pp. 9-21.GlobalTectonics

Abstract: Mineral deposits are heterogeneously distributed in both space and time, with variations reflecting tectonic setting, evolving environmental conditions, as in the atmosphere and hydrosphere, and secular changes in the Earth’s thermal history. The distribution of deposit types whose settings are tied to plate margin processes (e.g. orogenic gold, volcanic-hosted massive sulphide, Mississippi valley type Pb-Zn deposits) correlates well with the supercontinent cycle, whereas deposits related to intra-cratonic settings and mantle-driven igneous events, such as Ni-Cu-PGE deposits, lack a clear association. The episodic distribution of deposits tied to the supercontinent cycle is accentuated by selective preservation and biasing of rock units and events during supercontinent assembly, a process that encases the deposit within the assembled supercontinent and isolates it from subsequent removal and recycling at plate margins.
DS201509-0388
2015
Cawthorn, R.G.The geometry and emplacement of the Pilanesberg Complex, South Africa.Geological Magazine, Vol. 152, 5, pp. 802-812.Africa, South AfricaAlkalic

Abstract: The circular 625 km2 alkaline Pilanesberg Complex, South Africa, contains coeval eruptive and several distinctive intrusive syenitic and foyaitic components, concentrically arranged at the surface. However, owing to poor outcrop the relationships between the different intrusive rocks, and their shape in the third dimension cannot be convincingly determined in the field. The original interpretation was a laccolith, whereas later models suggested a funnel shape, and appealed to ring-dyke and cone-sheet emplacement mechanisms. However, the radial widths of these coarse-grained bodies are over 1 km and so cannot have been emplaced as ring dykes or cone sheets, which are usually quite thin and fine grained. Creating the space for emplacement and removal of pre-existing country rocks for each postulated subsequent intrusive event presents a major challenge to this latter hypothesis. Extensive previously published and new field relationships are re-evaluated here to suggest that the body is a gently inward-dipping sheet and that subsequent injections of magma merely pumped up an existing and evolving magma chamber rather than intruded into solid rocks. A Bouguer gravity anomaly model is presented that supports the concept of a shallow, flat-bottomed body rather than one that continues to significant depth. There are many analogies with the Kangerlussuaq Intrusion, Greenland.
DS201512-1902
2015
Cayer, E.M., Winterburn, P.A., Elliott, B.Development of geochemical exploration technologies for the discovery of concealed kimberlites under glacial overburden, NWT.43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 22.Canada, Northwest TerritoriesGeochemistry

Abstract: Attention is being focused on the development of deep penetrating geochemical exploration methods as the discovery rate of world class deposits decreases. Diamondiferous kimberlites located in the Lac de Gras region of the Northwest Territories are one of the many deposit types in Canada covered by glacial overburden, and are therefore challenging to detect. This paper presents initial results from an investigation of the DO-18 kimberlite (Peregrine Diamonds), buried under 5-20m of glacial cover, to identify surface geochemical responses directly related to the buried kimberlite and differentiate between physical and chemical transport mechanisms. A detailed grid of 150 samples over an area of 0.5km2 sampled the oxidized upper B soil horizon in till above and off the DO-18 kimberlite into background. Regolith mapping was conducted and included surficial soil type and rock fragments, topographic variation and physical features, e.g. bogs, swamps, vegetation and glacial direction indicators. This allows an assessment of surface controls on the geochemistry, including the generation of false anomalies from chemical traps such as swamps. Multi-element geochemistry comprising 4-acid, Aqua-Regia and distilled water extraction coupled with ICP-MS was undertaken using commercial techniques to identify and differentiate between those elements migrating by chemical process from those migrating by physical transportation. Hydrocarbons were analysed using the SGH-technique (ActLabs) and the Gore-sorber technique (AGI) to characterize type and abundance of complex hydrocarbons above the kimberlite relative to the host granite gneiss. Preliminary results from the 4-acid digestion data show a clastic dispersion of Nb, Ni, Mg, Co, Cr and Cs from directly above the kimberlite to the edge of the sampling grid 500 metres northwest of the buried kimberlite. Surface material exhibits a strong control on geochemistry with trace elements being controlled by major elements (Al, Fe, Mn) found within each surface material type, and in some cases are heavily influenced by the presence of organic carbon. Evaluation of these relationships allows clarification of the natural background noise and enhancement of the geochemical responses and contrasts.
DM201501-0467
2014
CBC NewsWork starts on winter road network in Ontario. VictorCbcnews.ca, Dec. 9, 1p.Canada, OntarioNews item - ice roads
DM201502-2464
2015
CBC NewsTaken alone, NWT exploration figures fail to impress.Cbcnews.ca, Jan. 22, 1/2p.Canada, Northwest TerritoriesNews item - spending
DM201503-0468
2015
CBC NewsClock ticking on Ekati mine expansion: Dominion Diamond Corporation. Company says current timeline of environmental assessment could delay construction, prompt layoffs.Cbcnews.ca, Jan. 25, 1p.Canada, Northwest TerritoriesNews item - Dominion
DM201503-0469
2015
CBC NewsN.W.T. to study diamond mine ice road into all-season road. Cbcnews.ca, Jan. 29, 1/4p.Canada, Northwest TerritoriesNews item - ice road
DM201504-0470
2015
CBC NewsSnap Lake mine could close if dissolved solid limit not raised: De Beers. Company asking Mackenzie Valley Land and Water Board to nearly triple limit.Cbcnews.ca, Mar. 13, 2p.Canada, Northwest TerritoriesNews item - De Beers
DM201507-0473
2015
CBC NewsYellowknives Dene lose Drybones Bay diamond exploration appeal. Federal court upholds Debogorski's proposal. ( took 4 years and will still be appealed by Dene)Cbcnews.ca, June 26, 1p.Canada, Northwest TerritoriesNews item - Drybones Bay
DM201507-0474
2015
CBC News2nd De Beers Snap Lake dissolved solid limit increase OK'd by N.W.T. board. Mackenzie Valley Land and Water Board( 1,000 milligrams per litre for rest of mine's life.)Cbcnews.ca, June 25, 1p.Canada, Northwest TerritoriesNews item - De Beers
DM201508-0471
2015
CBC NewsNunavut property owners owe nearly $ 3.3 million in tax arrears. Shear Minerals owes $ 1.5 in property tax arrears on its abandoned Jericho Diamond Mine. Cbcnews.ca, July 8, 1/2p.Canada, NunavutNews item - Shear Minerals
DM201508-0472
2015
CBC NewsEkati mine expansion in NWT doesn’t need review: feds. Jay project.Cbcnews.ca, July 22, 1/4p.Canada, Northwest TerritoriesNews item - Dominion
DM201510-2002
2015
CBC NewsSnap Lake diamond mine's water licence change ok'd by N.W.T. minister.CBCnews.ca , Sept. 17, 1p.Canada, Northwest TerritoriesNews item - De Beers
DM201510-2003
2015
CBC NewsDiavik's mine's ability to recoup $ 159 million security at risk from Ekati expansion: Rio Tinto. Jay CBCnews.ca , Sept. 2, 1p.Canada, Northwest TerritoriesNews item - Rio Tinto
DM201511-2112
2015
CBC NewsWhy De Beers makes diamonds it will never sell. ( lab synthetics) Element SixCBC.ca, Oct. 8, 3p.TechnologyNews item - De Beers
DC201512-2421
2015
Centaurus Diamond Technologies Inc.Restarts final phase of R&D in revolutionary cultured diamond … MagnatekCentaurus Diamond Technologies, Inc., Nov. 5, 1p.TechnologyNews item - press release
DS201504-0188
2015
Cerantola, V., Walte, N.P., Rubie, D.C.Deformation of a crystalline olivine aggregate containing two immiscible liquids: implications for early core-mantle differentiation.Earth and Planetary Science Letters, Vol. 417, pp. 67-77.MantleCore, mantle

Abstract: Deformation-assisted segregation of metallic and sulphidic liquid from a solid peridotitic matrix is a process that may contribute to the early differentiation of small planetesimals into a metallic core and a silicate mantle. Here we present results of an experimental study using a simplified system consisting of a polycrystalline Fo90-olivine matrix containing a small percentage of iron sulphide and a synthetic primitive MORB melt, in order to investigate whether the silicate melt enhances the interconnection and segregation of FeS liquid under deformation conditions at varying strain rates. The experiments have been performed at 2 GPa, 1450?°C and strain rates between 1×10?3 s?11×10?3 s?1 to 1×10?5 s?11×10?5 s?1. Our results show that the presence of silicate melt actually hinders the migration and segregation of sulphide liquid by reducing its interconnectivity. At low to moderate strain rates the sulphide liquid pockets preserved a roundish shape, showing the liquid behavior is governed mainly by surface tension rather than by differential stress. Even at the highest strain rates, insignificant FeS segregation and interconnection were observed. On the other hand the basaltic melt was very mobile during deformation, accommodating part of the strain, which led to its segregation from the matrix at high bulk strains leaving the sulphide liquid stranded in the olivine matrix. Hence, we conclude that deformation-induced percolation of sulphide liquid does not contribute to the formation of planetary cores after the silicate solidus is overstepped. A possible early deformation enhanced core-mantle differentiation after overstepping the Fe-S solidus is not possible between the initial formation of silicate melt and the formation of a widespread magma ocean.
DS201510-1761
2014
Chakhmouradian, A.R., Cooper, M.A., Ball, N., Reguir, E.P., Medici, L., Abdu, Y., Antonov, A.A.Vladykinite, Na3Sr4(Fe2+Fe3+)Si8024: a new complex sheet silicate from peralkaline rocks of the Murun Complex, eastern Siberia, Russia.Deep-seated magmatism, its sources and plumes, Proceedings of XIII International Workshop held 2014., Vol. 2014, pp. 5-21.Russia, SiberiaDeposit - Murun

Abstract: Vladykinite, ideally Na3Sr4(Fe2+Fe3+)Si8O24, is a new complex sheet silicate occurring as abundant prismatic crystals in a dike of coarse-grained peralkaline feldspathoid syenite in the north-central part of the Murun complex in eastern Siberia, Russia (Lat. 58° 22? 48? N; Long. 119° 03? 44? E). The new mineral is an early magmatic phase associated with aegirine, potassium feldspar, eudialyte, lamprophyllite, and nepheline; strontianite (as pseudomorphs after vladykinite) and K-rich vishnevite are found in the same assemblage, but represent products of late hydrothermal reworking. Vladykinite is brittle, has a Mohs hardness of 5, and distinct cleavage on {100}. In thin section, it is colorless, biaxial negative [a = 1.624(2), b = 1.652(2), g = 1.657(2), 2Vmeas = 44(1)°, 2Vcalc = 45(1)°] and shows an optic orientation consistent with its structural characteristics (X^a = 5.1° in b obtuse, Z^c = 4.7° in b acute, Y = b). The Raman spectrum of vladykinite consists of the following vibration modes (listed in order of decreasing intensity): 401, 203, 465, 991, 968, 915, 348, 167, 129, 264, 1039, and 681 cm–1; O-H signals were not detected. The Mössbauer spectrum indicates that both Fe2+ and Fe3+ are present in the mineral (Fe3+/FeS = 0.47), and that both cations occur in a tetrahedral coordination. The mean chemical composition of vladykinite (acquired by wavelength-dispersive X?ray spectrometry and laser-ablation inductively-coupled-plasma mass-spectrometry), with FeS recast into Fe2+ and Fe3+ in accord with the Mössbauer data, gives the following empirical formula calculated to 24 O atoms: (Na2.45Ca0.56)S3.01(Sr3.81 K0.04Ba0.02La0.02Ce0.01)S3.90(Fe2+0.75Fe3+0.66Mn0.26Zn0.16Al0.12Mg0.05Ti0.01)S2.01(Si7.81Al0.19)S8.00O24. The mineral is monoclinic, space group P21/c, a = 5.21381(13), b = 7.9143(2), c = 26.0888(7) Å, b = 90.3556(7)°, V = 1076.50(5) Å3, Z = 2. The ten strongest lines in the powder X?ray diffraction pattern are [dobs in Å (I) (hkl)]: 2.957 (100) (123, 123); 2.826 (100) (117, 117); 3.612 (58) (114, 114); 3.146 (37) (120); 2.470 (32) (210, 01.10); 4.290 (30) (111, 111); 3.339 (30) (106, 115, 106); 2.604 (28) (200); 2.437 (25) (034); 1.785 (25) (21.10, 234). The structure of vladykinite, refined by single-crystal techniques on the basis of 3032 reflections with Fo > 4sFo to R1 = 1.6%, consists of tetrahedral sheets parallel to (100) and consisting of (Si8O24)16– units incorporating four-membered silicate rings and joined into five- and eight-membered rings by sharing vertices with larger tetrahedra hosting Fe2+, Fe3+, Mn, Zn, Al, Mg, and Ti. Larger cations (predominantly Na, Sr, and Ca) are accommodated in octahedral and square-antiprismatic interlayer sites sandwiched between the tetrahedral sheets. Structural relations between vladykinite and other sheet silicates incorporating four-, five-, and eight-membered rings are discussed. The name vladykinite is in honor of Nikolay V. Vladykin (Vinogradov Institute of Geochemistry, Russia), in recognition of his contribution to the study of alkaline rocks. Holotype and co-type specimens of the mineral were deposited in the Robert B. Ferguson Museum of Mineralogy in Winnipeg, Canada.
DS201512-1903
2015
Chakhmouradian, A.R., Cooper, M.A., Medici, L., Abdu, Y.A., Shelukhina, Y.S.Anzaite-(Ce), a new rare earth mineral and structure type from the AfrikAnd a silicocarbonatite, Kola Peninsula.Mineralogical Magazine, Vol. 79, 5, pp. 1231-1244.RussiaCarbonatite

Abstract: Anzaite-(Ce), ideally Formula Fe2+Ti6O18(OH)2, is a new, structurally complex mineral occurring as scarce minute crystals in hydrothermally altered silicocarbonatites in the Afrikanda alkali-ultramafic complex of the Kola Peninsula, Russia. The mineral is a late hydrothermal phase associated with titanite, hibschite, clinochlore and calcite replacing the primary magmatic paragenesis. The rare-earth elements (REE) (dominated by Ce), Ti and Fe incorporated in anzaite-(Ce) were derived from primary Ti oxides abundant in the host rock. Anzaite-(Ce) is brittle and lacks cleavage; the density calculated on the basis of structural data is 5.054(6) g cm?3. The mineral is opaque and grey with a bluish hue in reflected light; its reflectance values range from 15-16% at 440 nm to 13-14% at 700 nm. Its infrared spectrum shows a prominent absorption band at 3475 cm?1 indicative of OH? groups. The average chemical composition of anzaite-(Ce) gives the following empirical formula calculated on the basis of 18 oxygen atoms and two OH? groups: (Ce2.18Nd0.85La0.41Pr0.26Sm0.08Ca0.36Th0.01)?4.15Fe0.97(Ti5.68Nb0.22Si0.04)?5.94O18(OH)2. The mineral is monoclinic, space group C2/m, a = 5.290(2), b = 14.575(6), c = 5.234(2) Å, ? = 97.233(7)°, V = 400.4(5) Å3, Z = 1. The ten strongest lines in the X-ray micro-diffraction pattern are [dobs in Å (I) hkl]: 2.596 (100) 002; 1.935 (18) 170; 1.506 (14) 133; 1.286 (13) 1.11.0; 2.046 (12) 2?41; 1.730 (12) 003; 1.272 (12) 0.10.2; 3.814 (11) 1?11; 2.206 (9) 061; 1.518 (9) 172. The structure of anzaite-(Ce), refined by single-crystal techniques to R1 = 2.1%, consists of alternating layers of type 1, populated by REE (+ minor Ca) in a square antiprismatic coordination and octahedrally coordinated Fe2+, and type 2, built of five-coordinate and octahedral Ti, stacked parallel to (001). This atomic arrangement is complicated by significant disorder affecting the Fe2+, five-coordinate Ti and two of the four anion sites. The order-disorder pattern is such that only one half of these positions in total occupy any given (010) plane, and the disordered (010) planes are separated by ordered domains comprising REE, octahedral Ti and two anion sites occupied by O2?. Structural and stoichiometric relations between anzaite-(Ce) and other REE-Ti (±Nb, Ta) oxides are discussed. The name anzaite-(Ce) is in honour of Anatoly N. Zaitsev of St Petersburg State University (Russia) and The Natural History Museum (UK), in recognition of his contribution to the study of carbonatites and REE minerals. The modifier reflects the prevalence of Ce over other REE in the composition of the new mineral.
DS201508-0344
2015
Chakhmouradian, A.R., Reguir, E.P., Coueslan, C., Yang, P.Calcite and dolomite in intrusive carbonatites. II Trace element variations.Mineralogy and Petrology, in press available 17p.GlobalCarbonatite

Abstract: The composition of calcite and dolomite from several carbonatite complexes (including a large set of petrographically diverse samples from the Aley complex in Canada) was studied by electron-microprobe analysis and laser-ablation inductively-coupled-plasma mass-spectrometry to identify the extent of substitution of rare-earth and other trace elements in these minerals and the effects of different igneous and postmagmatic processes on their composition. Analysis of the newly acquired and published data shows that the contents of rare-earth elements (REE) and certain REE ratios in magmatic calcite and dolomite are controlled by crystal fractionation of fluorapatite, monazite and, possibly, other minerals. Enrichment in REE observed in some samples (up to ~2000 ppm in calcite) cannot be accounted for by coupled substitutions involving Na, P or As. At Aley, the REE abundances and chondrite-normalized (La/Yb)cn ratios in carbonates decrease with progressive fractionation. Sequestration of heavy REE from carbonatitic magma by calcic garnet may be responsible for a steeply sloping "exponential" pattern and lowered Ce/Ce* ratios of calcite from Magnet Cove (USA) and other localities. Alternatively, the low levels of Ce and Mn in these samples could result from preferential removal of these elements by Ce4+- and Mn3+-bearing minerals (such as cerianite and spinels) at increasing f(O2) in the magma. The distribution of large-ion lithophile elements (LILE = Sr, Ba and Pb) in rock-forming carbonates also shows trends indicative of crystal fractionation effects (e.g., concomitant depletion in Ba + Pb at Aley, or Sr + Ba at Kerimasi), although the phases responsible for these variations cannot be identified unambiguously at present. Overall, element ratios sensitive to the redox state of the magma and its complexing characteristics (Eu/Eu*, Ce/Ce* and Y/Ho) are least variable and in both primary calcite and dolomite, approach the average chondritic values. In consanguineous rocks, calcite invariably has higher REE and LILE levels than dolomite. Hydrothermal reworking of carbonatites does not produce a unique geochemical fingerprint, leading instead to a variety of evolutionary trends that range from light-REE and LILE enrichment (Turiy Mys, Russia) to heavy-REE enrichment and LILE depletion (Bear Lodge, USA). These differences clearly attest to variations in the chemistry of carbonatitic fluids and, consequently, their ability to mobilize specific trace elements from earlier-crystallized minerals. An important telltale indicator of hydrothermal reworking is deviation from the primary, chondrite-like REE ratios (in particular, Y/Ho and Eu/Eu*), accompanied by a variety of other compositional changes depending on the redox state of the fluid (e.g., depletion of carbonates in Mn owing to its oxidation and sequestration by secondary oxides). The effect of supergene processes was studied on a single sample from Bear Lodge, which shows extreme depletion in Mn and Ce (both due to oxidation), coupled with enrichment in Pb and U, possibly reflecting an increased availability of Pb2+ and (UO2)2+ species in the system. On the basis of these findings, several avenues for future research can be outlined: (1) structural mechanisms of REE uptake by carbonates; (2) partitioning of REE and LILE between cogenetic calcite and dolomite; (3) the effects of fluorapatite, phlogopite and pyrochlore fractionation on the LILE budget of magmatic carbonates; (4) the cause(s) of coupled Mn-Ce depletion in some primary calcite; and (5) relations between fluid chemistry and compositional changes in hydrothermal carbonates.
DS201508-0345
2015
Chakhmouradian, A.R., Reguir, E.P., Zaitsev, A.N.Calcite and dolomite in intrusive carbonatites. I Textural variastions.Mineralogy and Petrology, in press available 28p.GlobalCarbonatite

Abstract: Carbonatites are nominally igneous rocks, whose evolution commonly involves also a variety of postmagmatic processes, including exsolution, subsolidus re-equilibration of igneous mineral assemblages with fluids of different provenance, hydrothermal crystallization, recrystallization and tectonic mobilization. Petrogenetic interpretation of carbonatites and assessment of their mineral potential are impossible without understanding the textural and compositional effects of both magmatic and postmagmatic processes on the principal constituents of these rocks. In the present work, we describe the major (micro)textural characteristics of carbonatitic calcite and dolomite in the context of magma evolution, fluid-rock interaction, or deformation, and provide information on the compositional variation of these minerals and its relation to specific evolutionary processes.
DS201508-0346
2015
Chalapathi Rao, N.V., Atiullah, Kumar, A., Sahoo, S., Nanda, P., Chahong, N., Lehmann, B., Rao, K.V.S.Petrogenesis of Mesoproterozoic lamproite dykes from the Garledinne (Banganapalle) cluster, south western Cuddapah Basin, southern India.Mineralogy and Petrology, in press available 22p.IndiaLamproite

Abstract: We report mineral chemistry and whole-rock major and trace-element geochemistry for a recent find of Mesoproterozoic (~1.4 Ga) lamproites from the Garledinne (Banganapalle) cluster, south-western part of the Paleo-Mesoproterozoic Cuddapah Basin, southern India. The Garledinne lamproites occur as WNW-ESE-trending dykes that have undergone varying degree of pervasive silicification and carbonate alteration. Nevertheless, their overall texture and relict mineralogy remain intact and provide important insights into the nature of their magmas. The lamproite dykes have porphyritic to weakly porphyritic textures comprising pseudomorphed olivine macrocrysts and microphenocrysts, titanian phlogopite microphenocrysts, spinel having a compositional range from chromite to rarely magnesiochromite, Sr-rich apatite and niobian rutile. The Garledinne and other Cuddapah Basin lamproites (Chelima and Zangamarajupalle) collectively lack sanidine, clinopyroxene, potassic richterite, and titanite and are thus mineralogically distinct from the nearby Mesoproterozoic lamproites (Krishna and Ramadugu) in the Eastern Dharwar Craton, southern India. The strong correlation between various major and trace elements coupled with high abundances of incompatible and compatible trace elements imply that alteration and crustal contamination have had a limited effect on the whole-rock geochemistry (apart from K2O and CaO) of the Garledinne lamproites and that olivine fractionation played an important role in their evolution. The Garledinne lamproites represent small-degree partial melts derived from a refractory (previously melt extracted) peridotitic mantle source that was subsequently metasomatised (enriched) by carbonate-rich fluids/melts within the garnet stability field. The involvement of multiple reservoirs (sub-continental lithospheric mantle and asthenosphere) has been inferred in their genesis. The emplacement of the Garledinne lamproites is linked to extensional events, across the various Indian cratons, related to the break-up of the Proterozoic supercontinent of Columbia.
DS201509-0389
2015
Chalapathi Rao, N.V., Dongre, A., Wu, F-Y., Lehmann, B.A Late Cretaceous ( ca.90Ma) kimberlite event in southern India: implication for sub-continental lithospheric mantle evolution and diamond exploration. WajrakarurGondwana Research, in press available 12p.IndiaDeposit - Timmasamudram
DC201505-1428
2015
Chalice Gold Mines LimitedWebb diamond project update. ( Meteoric Resources Limited press release)Chalice Gold Mines Limited, Mar. 27, 1p.AustraliaNews item - press release
DS201506-0258
2015
Chapin, M.,Pardieu, V., Lucas, A.Mozambique: a ruby discovery for the 21st. Century. MontepuezGems & Gemology, Vol. 51, 1, pp. 44-54.Africa, MozambiqueDeposit - ruby
DS201504-0189
2015
Chapman, J.Why aren't all natural diamonds larger than 10 carats - they've had millions of years to grow.Vancouver Kimberlite Cluster, Mar. 17, 1p. AbstractTechnologyDiamond morphology
DS201504-0190
2015
Chapman, J.Chromism in pink diamonds.The Australian Gemmologist, Vol. 25, 8, pp. 268-271.TechnologyDeposit - Argyle
DS201511-1828
2004
Chapman, J.G., Boxer, G.L.Size distribution analyses for estimating grade and value.Lithos, Vol. 76, pp. 369-375. Available pdfTechnologyMicrodiamonds - responses

Abstract: Analysing the size frequency distributions (SFDs) of both micro diamonds and macro diamonds from primary deposits shows that the distributions are continuous across all sizes and that there are two regions of different character with a transition about 1-2 mm. Using log axes, the frequency curve is linear for the smaller sizes allowing slope and intercept parameters to be determined which are less ambiguous than stone counts and ratios of macro to micro populations that are generally reported. Modelling a diamond population that has undergone removal of a uniform thickness of the outer layer transforms a linear frequency curve into a quadratic form, which is also the form of the frequency curve for macro diamonds. Diamonds grown synthetically also display a linear distribution across a smaller fraction of their size distribution curve.
DS201510-1762
2015
Cheirsirikul, S., Jesen, S., Hruanun, C.The MSM diamond device for direct and indirect X-ray detection.2015 IEEE 10th International Conference on Nan/Micro Engineered and Molecular Systems, NEMS 2015, pp. 372-374.TechnologyX-ray dectector

Abstract: Development synthesizing diamond film on silicon substrate was processed by Hot Filament Chemical Vapor Deposition (HFCVD). The gas processes using of H2 and CH4 to produce intrinsic diamond and MSM device constructed on the diaphragm of diamond film. Schottky junctions on the top and the lower diaphragm were produced by aluminum metal. After that, the result of detecting a direct and indirect X-ray of MSM diamond was satisfactory because it could respond along with increasing of X-ray intensity. The X-ray expose time of indirect expose by BaF2 scintillator faster more than direct expose.
DS201502-0050
2015
Chen, M., Tian, W.Surface and mantle expression of the Early Permian Tarim mantle plume.Economic Geology Research Institute 2015, Vol. 17,, # 1147, 1p. AbstractChinaPeridotite, xenoliths

Abstract: The mantle process during the Early Permian Tarim plume event is revealed by flood basalt and mantle xenoliths. Permian Tarim flood basalts have typical two pulses' eruption. The first pulse of the Tarim flood basalt was erupted at 291-290Ma, characterized by OIB-like Zr/Nb (~5.83), Nb/La and Ce/Pb ratios, and PUM-like initial 187Os/188Os ratios (0.1308-0.1329). They're plotted along a 290±11Ma isochron, implying a pristine "plume mantle" source. The second pulse of the Tarim flood basalt was erupted at 283-281 Ma, with Zr/Nb (~13.6), Nb/La and Ce/Pb ratios similar or close to the lower crust and initial 187Os/188Os ratios (0.1743~19.6740) that deviated from the ~290 Ma isochron line, indicative of significant crustal assimilation. Mantle-derived peridotite and pyroxenite xenoliths hosted in Cenozoic alkali basalts (~20 Ma) are found in the Xikeer, western Tarim Block. Based on their petrographic and geochemical characteristics, peridotite xenoliths can be divided into three groups. Group 1 peridotites, with the presence of the high Mg-number of olivines (91-93) and spinel-pyroxenes clusters, experienced high-degree melt extraction (~17% fractional melting) from garnet- to spinel-stable field. Groups 2 and 3 peridotites, characterized by the clinopyroxenes with spoon-shaped and highly fractionated REE patterns respectively, underwent extensive silicate melt metasomatism at low melt/rock ratios (15) and that the host basanite is incapable of being the metasomatic agent. The Re-Os isotopic systematics of the Xikeer peridotites and pyroxenites yield an isochron of 290±11 Ma, virtually identical to the age of Tarim flood basalts. Their PUM-like Os initial ratios and convecting mantle-like É?Nd(t=290 Ma) strongly suggest that the Xikeer mantle xenoliths derive from the plume mantle. We propose that the Xikeer xenolith suite recorded mantle 'auto-refertilization' process, i.e., they may have been initially formed by melt extraction from the convecting mantle and, shortly after, was refertilized by plume melts during the Early Permian.
DS201502-0051
2015
Chen, T., Gwanmesia, G.D., Wang, X., Zou, Y., Liebermann, R.C., Michaut, C., Li, B.Anomalous elastic properties of coesite at high pressure and implications for the upper mantle X-discontinuity.Earth and Planetary Science Letters, Vol. 412, pp. 42-51.MantleCoesite

Abstract: Compressional and shear wave velocities of coesite have been measured using ultrasonic interferometry in a multi-anvil apparatus up to 12.6 GPa at room temperature for the first time. While the P wave velocity increases continuously with pressure, the S wave exhibits an anomalous softening and the velocity decreases continuously with pressure. Finite strain analysis of the data yielded KS0=103.6(4) GPaKS0=103.6(4) GPa, G0=61.6(2) GPaG0=61.6(2) GPa and View the MathML sourceK0?=2.9(1), View the MathML sourceG0?=0.3(1) for the bulk and shear moduli and their pressure derivatives, respectively. The anomalous elastic behavior of coesite results in large velocity and impedance contrasts across the coesite–stishovite transition, reaching ?39% and ?48% for P and S wave velocity contrasts, and ?70% and 78% for P and S wave impedance contrasts, respectively, at pressure ?8 GPa, with P and S wave velocity perturbations showing no apparent dependence on depths (i.e., View the MathML sourcedln?V(PorS)/dh?0) within 8–12 GPa. These unusually large contrasts and depth independent characteristics render the transition between the two silica polymorphs one of the most plausible candidates for the cause of the seismically observed X-discontinuity. The current P and S wave velocity perturbation dependences on the SiO2 content, d(ln?VP)/d(SiO2)?0.43 (wt%)?1d(ln?VP)/d(SiO2)?0.43 (wt%)?1 and d(ln?VS)/d(SiO2)?0.60 (wt%)?1d(ln?VS)/d(SiO2)?0.60 (wt%)?1, can serve as a geophysical probe to track ancient subducted eclogite materials to gain insights on the geodynamics of the mantle.
DS201512-1904
2015
Chen, W., Leblanc, S.G., White, H.P., Milkovic, B., O'Keefe, H., Croft, B., Gunn, A., Boulanger, J.Caribou relevant environmental changes around the Ekati diamond mine measured in 2015.43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 24.Canada, Northwest TerritoriesDeposit - Ekati

Abstract: How would a large open pit mine on caribou range (e.g., the Ekati Diamond Mine in the Bathurst caribou’s summer range) have influenced caribou? A traditional knowledge study on the cumulative impacts on the Bathurst caribou herd qualitatively described how mining activities might have influenced the herd (Mackenzie et al. 2013): caribou migration routes deflected away from the mines probably due to seeing mining activities or hearing the noises; and skinny caribou or abnormal smells and materials in caribou meat, liver, or the hide linings probably related to changes in caribou forage and quality of water and air. In other words, the potential influences of mining operations on caribou were most likely through altering what caribou can see, hear, smell (e.g., dusts and fine particle matter < 2.5 ?m (PM2.5) in the air, and from acidity in the soil), and taste (e.g., dust on foliage, vegetation composition change). Boulanger et al. (2012) estimated the size of a zone of influence (ZOI) of the Ekati-Diavik mining complex in the Bathurst caribou summer range, using caribou presence dataset. They also explored the mechanisms of ZOI using the spatial distribution of the total suspended particles, which was simulated with an atmospheric transport and dispersion model (Rescan, 2006). While these studies have added to our understanding of the possible impacts of mining operations on caribou, knowledge gaps remain. One outstanding gap is the lack of direct measurements about the caribou relevant environmental changes caused by mining operations. For example, exactly from how far away can caribou clearly see the vehicles driving on a mining road, or the buildings and the elevated waste piles in a camp? From how far away might caribou hear the noise caused by mining operations? To what spatial extent had the dusts and PM2.5 from mining operations influenced the tundra ecosystems? And how the dusts and PM2.5 from mining operations might have influenced caribou forage quality? Potentially these questions can be answered by in-situ measurements and satellite remote sensing. For example, studies have showed that it is possible to remotely sense PM2.5 distribution using twice-daily MODIS data at a spatial resolution of 1 km (Lyapustin et al., 2011; Chudnovsky et al., 2013; Hu et al., 2014). The objective of this study is thus to quantitatively measure these changes around the Ekati Diamond Mine, by means of in-situ surveys and satellite remote sensing. We conducted field surveys at more than 100 sites around the Ekati Diamond Mine during August 14-23, 2015, a collaborative effort of the NWT CIMP project entitled “Satellite Monitoring for Assessing Resource Development’s Impact on Bathurst Caribou (SMART)”, and the Dominion Diamond Ekati Corporation. In this presentation, we will report preliminary results and lessons learned from our first year’s study.
DS201508-0347
2015
Chepurov, A.A., Pokhilenko, N.P.Experimental estimation of the kimberlite melt velosity. ( Nyurbinskaya mentioned)Doklady Earth Sciences, Vol. 462, 2, pp. 592-595.TechnologyPetrology - geodynamic model
DC201510-2337
2015
CMKM Diamonds Inc.CMKM defendants see Spooner plead guilty. Stockwatch, Sept. 10, 2p.United States, NevadaNews item - CMKM
DM201508-0478
2015
CNNPark visitor unearths 8.52 carat diamond in Arkansas. Esperanza DiamondCNN, June 27, 1p.United States, ArkansasNews item - Crater of Diamonds
DM201508-0479
2015
CNNRains wash out gems, lives in Gujarat diamond district.CNN, June 27, 1/2p.IndiaNews item - Gujarat
DS201511-1829
2015
Coblentz, D., Van Wijk, J., Richardson, R.M., Sandiford, M.The upper mantle geoid: implications for continental structure and the intraplate stress field.Geological Society of America Special Paper, No. 514, pp. SPE514-13.MantleGeophysics - seismics

Abstract: We use the fact that geoid anomalies are directly related to the local dipole moment of the density-depth distribution to help constrain density variations within the lithosphere and the associated tectonic stresses. The main challenge with this approach is isolating the upper mantle geoid contribution from the full geoid (which is dominated by sources in the lower mantle). We address this issue by using a high-pass spherical harmonic filtering of the EGM2008-WGS84 geoid to produce an "upper mantle" geoid. The tectonic implications of the upper mantle are discussed in terms of plate tectonics and intraplate stresses. We find that globally there is about a 9 meter geoid step associated with the cooling oceanic lithosphere that imparts a net force of ~2.5x1012 N/m in the form of "ridge push" - a magnitude that is consistent with 1-d models based on first-order density profiles. Furthermore, we ind a consistent 6 meter geoid step across passive a continental margin which has the net effect of educing the compressive stresses in the continents due to the ridge force. Furthermore, we use the pper mantle geoid to reevaluate the tectonic reference state which previously studies estimated using n assumption of Airy-based isostasy. Our evaluation of the upper mantle geoid confirms the near quivalence of the gravitational potential energy of continental lithosphere with an elevation of about 750 meters and the mid-ocean ridges. This result substantiates early conclusions about the tectonic reference state and further supports the prediction that continental regions are expected to be in a slightly extensional state of stress.
DS201503-0137
2015
Cohen, R.Missing link in metal physics explains Earth's magnetic field.gl.ciw.edu, Jan. 28, 1p.TechnologyMagnetics
DS201504-0191
2015
Comin-Chiaramonti, P., Gomes, C.B., De Min, A., Ernesto, M., Gasparon, M.Magmatism along the high Paraguay River at the border of Brazil and Paraguay: a review and new constraints on emplacement ages.Journal of South American Earth Sciences, Vol. 58, March pp. 72-81.South America, Paraguay, BrazilGeochronology

Abstract: The magmatic rocks from Alto Paraguay (High Paraguay River extensional lineament), western Apa craton, mainly consist of several major circular alkaline complexes and some rhyolitic domes and ignimbrites. The former are characterized by intrusive Na-alkaline rock-types (nepheline syenites and syenites and effusive equivalents) topped by lava flows and ignimbrites. Two main evolved suites were defined using petrochemical and Sr- isotope data: an agpaitic suite in the north and a miaskitic suite in the south. The domes of subalkaline rhyolitic lavas and ignimbrites occur to the north of the alkaline complexes, along the Paraguay River, near the town of Fuerte Olimpo. The emplacement ages of the alkaline complexes were constrained using the K-Ar, Ar-Ar, Rb-Sr and Sm-Nd dating methods on whole rocks and/or mineral separates (amphibole, alkali feldspar and biotite). Ages are quite variable (Upper Permian to Middle Triassic), with average K-Ar and Ar-Ar ages of 248.8 ± 4.8 and 241.8 ± 1.1 Ma, respectively, and Rb-Sr and Sm-Nd age data giving best values from 248 ± 4 to 244 ± 27 Ma and from 256 ± 3 to 257 ± 3 Ma, respectively. In contrast, the Fuerte Olimpo volcanics show a Mesoproterozoic age (1.3 Ga, K-Ar and Ar-Ar radiometric methods; and 1.42 ± 0.24 to 1.30 ± 0.03 Ga, Rb-Sr and Sm-Nd methods, respectively). Rb-Sr systematics (87Sr/86Sr initial ratios ? 0.7038) highlight a relatively "primitive" character of the Na-alkaline magmatic source(s), in contrast with the "crustal" values (87Sr/86Sr initial ratio ? 0.7105) of the Fuerte Olimpo rhyolites. Thus, magmatism in the Alto Paraguay area is related to two extensional events: a younger event corresponding to the Permian-Triassic alkaline rocks, and an older event connected to the Precambrian volcanic acidic rocks.
DC201505-1429
2015
Commerce Resources CorporationCommerce Resources completes 22 drill holes at the Ashram rare earth deposit.Commerce Resources Corporation, Apr. 15, 2p.Canada, QuebecNews item - press release
DC201505-1430
2015
Commerce Resources CorporationCompletes floatation pilot plant for Ashram rare earth deposit.Commerce Resources Corporation, Apr. 20, 2p.Canada, British ColumbiaNews item - press release
DS201510-1763
2015
Condie, B.Scientists create record pressure in a lab - twice that of Earth's core. Osmium sample.blog. cosmos magazine.com, Aug. 25, 1p.TechnologyOsmium
DS201506-0259
2015
Condie, K., Davaille, AsterUpstairs - downstairs: supercontinents and large igneous provinces, are they related?International Geology Review, Vol. 57, 11-12, pp. 1341-1348.MantleSupercontinents

Abstract: There is a correlation of global large igneous province (LIP) events with zircon age peaks at 2700, 2500, 2100, 1900, 1750, 1100, and 600 and also probably at 3450, 3000, 2000, and 300?Ma. Power spectral analyses of LIP event distributions suggest important periodicities at 250, 150, 100, 50, and 25?million years with weaker periodicities at 70-80, 45, and 18-20?Ma. The 25?million year periodicity is important only in the last 300?million years. Some LIP events are associated with granite-forming (zircon-producing) events and others are not, and LIP events at 1900 and 600?Ma correlate with peaks in craton collision frequency. LIP age peaks are associated with supercontinent rifting or breakup, but not dispersal, at 2450-2400, 2200, 1380, 1280, 800-750, and ?200?Ma, and with supercontinent assembly at 1750 and 600?Ma. LIP peaks at 2700 and 2500?Ma and the valley between these peaks span the time of Neoarchaean supercraton assemblies. These observations are consistent with plume generation in the deep mantle operating independently of the supercontinent cycle and being controlled by lower-mantle and core-mantle boundary thermochemical dynamics. Two processes whereby plumes can impact continental assembly and breakup are (1) plumes may rise beneath supercontinents and initiate supercontinent breakup, and (2) plume ascent may increase the frequency of craton collisions and the rate of crustal growth by accelerating subduction.
DS201509-0390
2015
Cooper, C.M.Puzzling the pieces - supercontinent at depth.Geology, Vol. 43, 9, pp. 847-848.GlobalPlate reconstructions

Abstract: Alfred Wegener famously argued that the seemingly puzzle piece–like fit of the Atlantic coastlines was not a mere coincidence, but rather one line of evidence proving that the continents were once arranged as a single, coherent supercontinent (Wegener, 1912,1920). This puzzle piece observation eventually launched a revolution that changed our understanding of the Earth from its deep interior to evolutionary processes. Often, however, we think of the supercontinent puzzle in a two-dimensional sense, neglecting to include or consider how variations of the thickness of the puzzle pieces might also be at play. How do the puzzle pieces fit together at depth, and is there more to learn by including lithospheric thickness in our plate reconstructions? Would thinking three-dimensionally in our plate reconstructions help resolve some of the outstanding questions about supercontinents, continental deformation, and the lithosphere in general? This is the motivation of new research by McKenzie et al. (2015, p. 783 in this issue of Geology).
DS201512-1905
2015
Cordier, C., Sauzeat, L., Arndt, N.T., Boullier, A-M., Batanova, V., Barou, F.Metasomatism of the lithospheric mantle immediately precedes kimberlite eruption: new evidence from olivine composition and microstructures.Journal of Petrology, Vol. 56, 9, pp. 1775-1796.TechnologyOlivine, metasomatism

Abstract: Most kimberlites contain abundant dunitic nodules. These are centimetre-sized, rounded and multi-grained assemblages of xenocrystic olivine with a wide range of compositions (Fo83 to Fo94). The absence of orthopyroxene and other mantle minerals and the range of olivine compositions have been attributed to reaction between mantle peridotite and (proto)kimberlitic fluid or melt, but the timing of the reaction is a subject of debate. In a kimberlite from the Kangamiut region of Greenland, nodule cores are surrounded by fine-grained outer margins with near-constant Fo contents (~Fo88) but highly variable minor element contents (e.g. 500-2500 ppm Ni). These margins crystallized from the kimberlite melt and we show that their compositions can be explained by crystallization of olivine alone, if a high partition coefficient for Ni between melt and olivine (DNi > 20) is assumed. Orthopyroxene assimilation is not required, removing the constraint that its dissolution occurred during ascent of the kimberlite magma. Within some nodules, in addition to the usual core-to-margin gradients, we observe asymmetric compositional changes (variable Fo but near-constant minor element contents) across mobile grain boundaries. These changes document fluid percolation at the grain scale that occurred during dynamic recrystallization in the deforming lithospheric mantle. We note that chemical gradients associated with mobile grain boundaries are observed in olivines that cover the entire compositional range of the nodules, and propose that fluid-assisted dynamic recrystallization took place in dunite that was already compositionally heterogeneous. Reaction between peridotite and protokimberlitic melt or fluid and dissolution of orthopyroxene thus occurred within the lithospheric mantle, immediately (a few days) prior to the ascent of the kimberlite melt and the entrainment of the dunite nodules. We propose that the grain boundary zones probably mimic, at a fine scale, the fluid-peridotite interaction that caused, at a larger scale, orthopyroxene dissolution and formation of compositionally diverse olivine in kimberlites.
DS201509-0391
2015
Cornah, A., Machaka, E.Integration of imprecise and biased dat a into mineral resource estimates.South African Institute of Mining and Metallurgy, Vol. 115, June pp. 523-531.GlobalResource estimation, kriging not specific to diamonds

Abstract: Mineral resources are typically informed by multiple data sources of varying reliability throughout a mining project life cycle. Abundant data which are imprecise or biased or both (‘secondary data’) are often excluded from mineral resource estimations (the ‘base case’) under an intuitive, but usually untested, assumption that this data may reduce the estimation precision, bias the estimate, or both. This paper demonstrates that the assumption is often wasteful and realized only if the secondary data are naïvely integrated into the estimation. A number of specialized geostatistical tools are available to extract maximum value from secondary information which are imprecise or biased or both; this paper evaluates cokriging (CK), multicollocated cokriging (MCCK), and ordinary kriging with variance of measurement error (OKVME). Where abundant imprecise but unbiased secondary data are available, integration using OKVME is recommended. This re-appropriates kriging weights from less precise to more precise data locations, improving the estimation precision compared to the base case and to Ordinary Kriging (OK) of a pooled data-set. If abundant secondary data are biased and imprecise, integration through CK is recommended as the biased data are zero-sum weighted. CK consequently provides an unbiased estimate with some improvement in estimation precision compared to the base case.
DS201512-1906
2015
Counts, B., Power, M.Proxima Diamonds Corp.: exploring for diamonds in the fertile Slave craton.43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 33.Canada, Northwest TerritoriesProspect - Sancy

Abstract: Proxima Diamonds Corp. is a private Canadian diamond exploration company exploring diamond targets in the heart of the diamond producing region of the Slave Geological Province. The company holds 17 target-rich properties that were selected based on a review of publicly available data, a proprietary kimberlite indicator mineral sample database and a wealth of experience exploring for diamonds in Canada's north. Focused kimberlite indicator mineral (KIM) sampling conducted by Proxima in 2014 identified a potential source area on the Sancy Property, located near the northern boundary of the Ekati Diamond Mine. Follow-up ground geophysical surveys completed over the area in spring 2015 have returned compelling results. Ground gravity, total magnetic field and capacitively coupled resistivity surveys identified a large, new target approximately 300 m from the diamondiferous T-10 kimberlite pipe. On this and other Proxima properties, focused KIM till sampling is defining likely source areas which will be surveyed with ground geophysical methods this winter.
DS201503-0138
2014
Cowing, M.D.Objective diamond clarity grading.The Journal of Gemmology, Vol. 34, 4, pp. 316-332.TechnologyMethodology and consistency
DS201503-0139
2015
Cowing, M.D.Grading diamond clarity objectively.Book - self published, michaelgem @gmail.com, Book availableTechnologyDiamond grading
DS201506-0260
2015
Crater of Diamonds State ParkPark visitor from Arkansas finds 3.69 carat white, teardrop-shaped diamond yesterday ( April 23) at Arkansas Crater of Diamonds State Park. Hallelujah nameCrater of Diamonds State Park, Apr. 23, 2p.United States, ArkansasCrater of Diamonds
DM201501-0480
2014
Creamers Mining WeeklyRio Tinto on path to sustainable increased shareholder returns.Creamers Mining Weekly, Dec. 4, 1/4p.GlobalNews item - Rio Tinto
DM201501-0481
2014
Creamers Mining WeeklyRio Tinto diamond bet adds sparkle to junior miner's prospects. Creamers Mining Weekly, Dec. 4, 1/4p.CanadaNews item - Rio Tinto
DM201501-0482
2014
Creamers Mining WeeklyDiamonds look to set to do well in 2015 - Investec.Creamers Mining Weekly, Dec. 5, 1/4p.GlobalNews item - prices
DM201501-0483
2014
Creamers Mining WeeklyFirst diamonds exported from Baoule trial mining.Creamers Mining Weekly, Dec. 5, 1/4p.Africa, GuineaNews item - Stellar
DM201501-0484
2014
Creamers Mining WeeklyStrike ends at DiamondCorp's Lace mine, workers to return on Monday.Creamers Mining Weekly, Dec. 5, 1/4p.Africa, South AfricaNews item - DiamondCorp
DM201501-0485
2014
Creamers Mining WeeklyParagon raises Lb257,000Creamers Mining Weekly, Dec. 5, 1/4p.Africa, LesothoNews item - Paragon
DM201501-0486
2014
Creamers Mining WeeklyStellar secures sufficient funds for working needs until first diamond sales.Creamers Mining Weekly, Dec. 11, 1/4p.Africa, GuineaNews item - Stellar
DM201501-0487
2014
Creamers Mining WeeklyDespite sagging grades, prices, Rockwell Diamonds reports record Q3 revenue.Creamers Mining Weekly, Dec. 16, 1/4p.Africa, South AfricaNews item - Rockwell
DM201502-0488
2015
Creamers Mining WeeklyDe Beers launches hub for entrepreneurs in Cape Town. De Beers Marine Zimele Business Hub.Creamers Mining Weekly, Jan. 8, 1/4p.Africa, South AfricaNews item - DBCM
DM201502-0489
2015
Creamers Mining WeeklyRio Tinto to invest $ 500 m in diamond project in India.Creamers Mining Weekly, Jan. 12, 1/4p.India, Madhya PradeshNews item - Rio Tinto
DM201502-0490
2015
Creamers Mining WeeklyRockwell boosts carat sales as recovery of large diamonds falters.Creamers Mining Weekly, Jan. 13, 1/4p.Africa, South AfricaNews item - Rockwell
DM201502-0491
2015
Creamers Mining WeeklyThe low oil price is expected to benefit the diamond business. De Beers CEO Phillippe Mellier.Creamers Mining Weekly, Jan. 21, 1/4p.GlobalNews item - De Beers
DM201503-0492
2015
Creamers Mining WeeklyGem Diamonds warns of possible price softening in early 2015. ElphickCreamers Mining Weekly, Jan. 27, 2p.Africa, BotswanaNews item - Gem Diamonds
DM201503-0493
2015
Creamers Mining WeeklyDiamond demand on the rise.Creamers Mining Weekly, Feb. 10, 1p.GlobalNews item - demand
DM201503-0494
2015
Creamers Mining WeeklyColoured gemstones coming into their own after being outshone by diamonds for decades.Creamers Mining Weekly, Feb 12, 1/4p.GlobalNews item - gemstones
DM201503-0495
2015
Creamers Mining WeeklyConstruction of De Beers Letlhakane tailings treatment plant.Creamers Mining Weekly, Feb. 20, 1/2p.Africa, BotswanaNews item - De Beers
DM201503-0496
2015
Creamers Mining WeeklyBotswana Diamonds with partner Alrosa focusing on Orapa area. Siesko and Future Creamers Mining Weekly, Feb. 20, 1/2p.Africa, BotswanaNews item - Botswana Diamonds, Alrosa
DM201503-0497
2015
Creamers Mining WeeklyLucara Diamond Corp declares special dividend on strong 2014 performance. KaroweCreamers Mining Weekly, Feb. 22, 1/4p.Africa, BotswanaNews item - Lucara
DM201503-2465
2015
Creamers Mining WeeklyMountain Province Diamonds starts C$95 m rights offering to fund cost overrun facility.Creamers Mining Weekly, Feb.22, 1/4p.Canada, Northwest TerritoriesNews item - Mountain Province
DM201504-0498
2015
Creamers Mining WeeklyAim listed diamond explorer Botswana Diamonds has shifted its 2015 focus to three licence areas covering more than 1000 km2 in the diamond province of Orapa, Botswana. GopeCreamers Mining Weekly, Feb. 20, 2p.Africa, BotswanaNews item - Botswana Diamonds
DM201504-0499
2015
Creamers Mining WeeklyDiamcor earnings drop 36%y/y. Krone-EndoraCreamers Mining Weekly, Feb. 27, 1/4p. Africa, South AfricaNews item - Diamcor
DM201504-0500
2015
Creamers Mining WeeklyConstruction on Letlhakane tailings expansion to start soon.Creamers Mining Weekly, Feb 25, 1p.Africa, BotswanaNews item - Debswana
DM201504-0501
2015
Creamers Mining WeeklyRio Tinto discloses tax payments to governments. Creamers Mining Weekly, Mar. 18, 1/4p.GlobalNews item - Rio Tinto
DM201504-0502
2015
Creamers Mining WeeklyEarly signs of another good year for diamond jewellery - De Beers.Creamers Mining Weekly, Mar. 20, 1/4p.GlobalNews item - De Beers
DM201504-0503
2015
Creamers Mining WeeklyGlobal diamond jewellery demand hits record $ 81 bln.Creamers Mining Weekly, Mar. 20, 1/4p.GlobalNews item - De Beers
DM201504-0504
2015
Creamers Mining WeeklySA junior in partnership to reopen Ghana diamond mine. Limoz Resources and Great Consolidated Diamond Ghana Limited. AkwatiaCreamers Mining Weekly, Mar. 20, 1p.Africa, GhanaNews item - Limoz
DM201504-0505
2015
Creamers Mining WeeklyFaltering Mbada resorts to digging conglomerate diamonds. MarangeCreamers Mining Weekly, Mar. 19, 1/2p.Africa, ZimbabweNews item - Mbada
DM201504-0506
2015
Creamers Mining WeeklyNew mining legislation to empower Indian provinces ( have to adhere to federal guidelines).Creamers Mining Weekly, Mar. 25, 1/4p.IndiaNews item - legal
DM201505-0507
2015
Creamers Mining WeeklyDe Beers starts three year global sightholder sales contracts.Creamers Mining Weekly, Mar. 31, 1/4p.GlobalNews item - De Beers
DM201505-0508
2015
Creamers Mining WeeklyNorton Rose Fulbright advises on $ 370 m financing of world's largest new diamond project. Gahcho KueCreamers Mining Weekly, Apr. 10, 1/4p.Canada, Northwest TerritoriesNews item - Mountain Province
DM201505-0509
2015
Creamers Mining WeeklyDebswana to cap output due to slow demand. Creamers Mining Weekly, Apr. 10, 1/4p.Africa, BotswanaNews item - Debswana
DM201505-0510
2015
Creamers Mining WeeklyFlawless 100 carat diamond sells for $ 22.1 million at N.Y. auction. Creamers Mining Weekly, Apr. 22, 1/4p.Africa, South AfricaNews item - diamond notable
DM201505-0511
2015
Creamers Mining WeeklyRio Tinto's Zimbabwe diamond production falls 42% in Q1. MurowaCreamers Mining Weekly, Apr. 21, 1/4p.Africa, ZimbabweNews item - Rio Tinto
DM201506-0512
2015
Creamers Mining WeeklyZimbabwe suspends tax on diamond sales - letter to IMF.Creamers Mining Weekly, Apr. 30, 1/4p.Africa, ZimbabweNews item - legal
DM201506-0513
2015
Creamers Mining WeeklyWorld Bourses prepare to confront diamond troubles at global gathering. Creamers Mining Weekly, Apr. 30, 1/4p.GlobalNews item - Bourses
DM201506-0514
2015
Creamers Mining WeeklyLace mine on target for mid-year start up.Creamers Mining Weekly, Apr. 30, 1/4p.Africa, South AfricaNews item - DiamondCorp
DM201506-0515
2015
Creamers Mining WeeklyBlueRock completes upgrade of Kareevlei plant, resumes commercial mining.BlueRock Diamonds Plc., May 19, 1/4p.Africa, South AfricaNews item - BlueRock
DM201506-0516
2015
Creamers Mining WeeklyNew mineral development strategy seeks to maintain Ontario's pole position. Creamers Mining Weekly, May 20, 1p.Canada, OntarioNews item - legal
DM201506-0517
2015
Creamers Mining WeeklyTrans Hex readies or hefty FY earninsg jump. Creamers Mining Weekly, May 25, 1/4p.Africa, South AfricaNews item - Trans Hex
DM201506-0518
2015
Creamers Mining WeeklyMining to kick off at Lace mine ahead of schedule in H2.Creamers Mining Weekly, May 26, 1/4p.Africa, South AfricaNews item - DiamondCorp
DM201507-0519
2015
Creamers Mining WeeklyLucapa to sign earthmoving deal, lists on Frankfurt Stock Exchange 28 May. LuloCreamers Mining Weekly, May 28, 1p.Africa, AngolaNews item - Lucapa
DM201507-0520
2015
Creamers Mining WeeklyIndia makes provisions for composite mining licences.Creamers Mining Weekly, June 3, 1/4p.IndiaNews item - legal
DM201507-0521
2015
Creamers Mining WeeklyJunior miners perceive Botswana as best investment destination.Creamers Mining Weekly, June 3, 1/4p.Africa, BotswanaNews item - legal
DM201507-0522
2015
Creamers Mining WeeklySouth Africa's geoscience desperately underfunded - Nedbank Capital comment.Creamers Mining Weekly, June 5, 1/4p.Africa, South AfricaNews item - DMR
DM201507-0523
2015
Creamers Mining WeeklyPioneering Botswana diamond circuit set for design run this month. KaroweCreamers Mining Weekly, June 9, 2p.Africa, BotswanaNews item - Lucara
DM201507-0524
2015
Creamers Mining WeeklyMining subtracting from Botswana's economic growth - economist.Creamers Mining Weekly, June 9, 1/2p.Africa, BotswanaNews item - economics
DM201507-0525
2015
Creamers Mining WeeklyBotswana diamond beneficiation hits rough patch.Creamers Mining Weekly, June 9, 1/2p.Africa, BotswanaNews item - Diamond Hub
DM201507-0526
2015
Creamers Mining WeeklyLesotho govt processing sale of Mothae diamond stake.Creamers Mining Weekly, June 9, 1/4p.Africa, LesothoNews item - Paragon
DM201507-0527
2015
Creamers Mining WeeklyDiamond miners show potential; as 4 declare dividends in last year. Alrosa, Dominion, Gem, Petra.Creamers Mining Weekly, June 12, 3p.GlobalNews item - dividends
DM201507-0528
2015
Creamers Mining WeeklyAlrosa does not see recovery in diamond prices this year.Creamers Mining Weekly, June 16 1/4p.RussiaNews item - Alrosa
DM201507-0529
2015
Creamers Mining WeeklyDiamond industry in the midst of 'complicated times'. Blom.Creamers Mining Weekly, June 15, 1/4p.GlobalNews item - economics
DM201507-0530
2015
Creamers Mining WeeklyDiamond Corp offers 21 m shares to raise 2 million pounds. LaceCreamers Mining Weekly, June 8, 1/4p.Africa, South AfricaNews item - DiamondCorp
DM201507-0531
2015
Creamers Mining WeeklyUncertain future for global diamond trade as profits vanish.Creamers Mining Weekly, June 25, 1/4p.GlobalNews item - economics
DM201507-0532
2015
Creamers Mining WeeklyRockwell to focus on production profile as Saxen drift output decreases.Creamers Mining Weekly, June 25, 1/4p.Africa, South AfricaNews item - Rockwell
DM201507-0533
2015
Creamers Mining WeeklyRio Tinto to sell stakes in Zim diamond, coal assets. MuroweCreamers Mining Weekly, June 25, 1/4p.Africa, ZimbabweNews item - Rio Tinto
DM201508-0534
2015
Creamers Mining WeeklyKimberley Diamonds secures debt fin ance for Botswana mine. From Chin a based auction house Zhejiang Huitong. LeralaCreamers Mining Weekly, June 30, 1p.Africa, BotswanaNews item - Kimberley
DM201508-0535
2015
Creamers Mining WeeklyDiamond Corp raises 5 million lbs over subscribed offer. LaceCreamers Mining Weekly, July 6, 1/4p.Africa, South AfricaNews item - DiamondCorp
DM201508-0536
2015
Creamers Mining WeeklyMadagascar to pass mining, petroleum bills in October - Minister.Creamers Mining Weekly, July 10, 1/4p.Africa, MadagascarNews item - legal
DM201508-0537
2015
Creamers Mining WeeklyKimberley gets go ahead for Lerala. Creamers Mining Weekly, July 20, 1/4p.Africa, BotswanaNews item - Kimberley Diamonds
DM201508-0538
2015
Creamers Mining WeeklyAmec launch of the UNCOVER Roadmap. …for greenfield exploration support.Creamers Mining Weekly, July 21, 1p.AustraliaNews item - AMEC
DM201509-0539
2015
Creamers Mining WeeklyDiamond miner De Beers Group has renewed gas and welding company Afrox contract ( Venetia)Creamers Mining Weekly, Aug. 28, 1/4p.Africa, South AfricaNews item - De Beers
DM201510-2004
2015
Creamers Mining WeeklyDiamond, gold worth Rand 2 Million bust at Beitbridge.Creamers Mining Weekly, Sept. 4, 1/4p.Africa, South Africa, Democratic Republic of CongoNews item - legal
DM201510-2005
2015
Creamers Mining WeeklyBotswana's Debswana cuts diamond production due to market downturn.Creamers Mining Weekly, Sept. 12, 1/4p.Africa, BotswanaNews item - Debswana
DM201510-2006
2015
Creamers Mining WeeklyBotswana Diamonds advances work at Orapa.Creamers Mining Weekly, Sept. 12, 1/4p.Africa, BotswanaNews item - Botswana Diamonds, Alrosa
DM201510-2007
2015
Creamers Mining WeeklyLucapa secures financing for Angolan expansion.Creamers Mining Weekly, Sept. 14, 1/2p.Africa, AngolaNews item - Lucapa
DM201510-2008
2015
Creamers Mining WeeklyUAE chosen as Kimberley Process Chair.Creamers Mining Weekly, Sept. 16, 1/4p.United Arab EmiratesNews item - KP
DM201510-2009
2015
Creamers Mining WeeklyTrans Hex diamond prices down in line with global slump. SomilunaCreamers Mining Weekly, Sept. 16, 1/4p.Africa, South Africa, AngolaNews item - Trans Hex
DM201510-2010
2015
Creamers Mining WeeklySierra Leone economy to shrink one-fifth amid mining crisis.Creamers Mining Weekly, Sept. 16, 1/4p.Africa, Sierra LeoneNews item - economics
DM201510-2011
2015
Creamers Mining WeeklyKimberley Diamonds shares fall as former chairperson arrested ( false information to the market).Creamers Mining Weekly, Sept. 16, 1/4p.AustraliaNews item - Kimberley Diamonds
DM201510-2012
2015
Creamers Mining WeeklyDiamond sales to stabilize in 2015, long term outlook positive.Creamers Mining Weekly, Sept. 22, 1/4p.GlobalNews item - De Beers
DM201510-2013
2015
Creamers Mining WeeklyDiamond prices down on market weakness - Rockwell.Creamers Mining Weekly, Sept. 22, 1/4p.Africa, South AfricaNews item - Rockwell
DM201510-2014
2015
Creamers Mining WeeklyLucapa strikes it lucky in Angola… ten special diamonds. LuloCreamers Mining Weekly, Sept. 22, 1/4p.Africa, AngolaNews item - Lucapa
DM201510-2015
2015
Creamers Mining WeeklyGemfields delivers maiden mineral resource, ore reserve estimates for Kagem. ( emerald)Creamers Mining Weekly, Sept. 23, 1p.Africa, ZambiaNews item - Gemfields
DM201511-2113
2015
Creamers Mining WeeklyLucapa recovers more special diamonds at Angola project. Lulo 90,56,36, 29Creamers Mining Weekly, Sept. 28, 1/4p.Africa, AngolaNews item - Lucapa
DM201511-2114
2015
Creamers Mining WeeklyStornoway lifts Renard resources, sees ample exploration upside.Creamers Mining Weekly, Sept. 28, 1/4p.Canada, QuebecNews item - Stornoway
DM201511-2115
2015
Creamers Mining WeeklyThe destruction of 95 % of South Africa's once bouyant diamond cutting and polishing industry showed once again that governments could not micromanage businesses. Creamers Mining Weekly, Oct. 1, 1p.Africa, South AfricaNews item - cutting and polishing
DM201511-2116
2015
Creamers Mining WeeklyParagon secures $ 15 million for Mothae, Lemphane development.Creamers Mining Weekly, Oct. 2, 1p.Africa, LesothoNews item - Paragon
DM201511-2117
2015
Creamers Mining WeeklyLucapa shares surge on kimberlite confirmation. ( Lulo area)Creamers Mining Weekly, Oct. 6, 1/4p.Africa, AngolaNews item - Lucapa
DM201511-2118
2015
Creamers Mining WeeklyBotswana plans "bold" economic stimulus after diamond price drop.Creamers Mining Weekly, Oct. 12, 1/4p.Africa, BotswanaNews item - economics
DM201511-2119
2015
Creamers Mining WeeklyLucapa sells more Lulo diamonds.Creamers Mining Weekly, Oct. 13, 1/4p.Africa, AngolaNews item - Lucapa
DM201511-2120
2015
Creamers Mining WeeklyLucapa ups alluvial output. LuloCreamers Mining Weekly, Oct. 14, 1/4p.Africa, AngolaNews item - Lucapa
DM201511-2121
2015
Creamers Mining WeeklyDebt-heavy Rockwell juggles operating costs, repayment obligations in Q2 16th. October 2015.Creamers Mining Weekly, Oct. 16, 1/4p.Africa, South AfricaNews item - Rockwell
DM201511-2122
2015
Creamers Mining WeeklyNow Oppenheimer properties edge out of De Beers' diamond route.Creamers Mining Weekly, Oct. 20, 2p.Africa, South AfricaNews item - Oppenheimer
DM201512-2216
2015
Creamers Mining WeeklyWork together or perish together. State diamond trader commentary at Diamond Indaba 2015.Creamers Mining Weekly, Oct. 27, 1p.Africa, South AfricaNews item - beneficiation
DM201512-2217
2015
Creamers Mining WeeklyConsider benefits of cross border diamond beneficiation.Creamers Mining Weekly, Oct. 28, 1/4p.Africa, South Africa, Botswana, NamibiaNews item - economics
DM201512-2218
2015
Creamers Mining WeeklyLucapa sells seventh parcel of Lulo diamonds.Creamers Mining Weekly, Nov. 16, 1/4p.Africa, AngolaNews item - Lucapa
DM201512-2219
2015
Creamers Mining WeeklyGlobal industry comments by Zimnisky ….Creamers Mining Weekly, Nov. 23, 3p.Canada, globalNews item - producers
DM201512-2220
2015
Creamers Mining WeeklyCanadian diamond producers best positioned to weather price crunch.Creamers Mining Weekly, Nov. 24, 1/4p.CanadaNews item - producers
DC201512-2422
2015
Crystal Exploration Inc.Crystal closes diamond projects acquisition. Muskox, Rush and James River properties.Crystal Exploration Inc., Nov. 25, 1p.Canada, Northwest TerritoriesNews item - press release
DS201508-0348
2015
Cucciniello, C., Tucker, R.D., Jourdan, F., Melluso, L., Morra, V.The age and petrogenesis of alkaline magmatism in the Ampasindava Peninsula and Nosy Be archipelago, northern Madagascar.Mineralogy and Petrology, in press available 23p.Africa, MadagascarBasanites, Foidites

Abstract: The Ampasindava alkaline province consists of a series of circular and elliptical intrusions, lava flows, dyke swarms and plugs of Cenozoic age emplaced into the Mesozoic-Cenozoic sedimentary rocks of the Antsiranana basin (NW Madagascar) and above the crystalline basement. The magmatism in the Ampasindava region is linked to a NW-SE trending extensional tectonic setting. New 40Ar/39Ar age determinations on feldspar separate of alkali granites and basaltic dykes yielded ages of 18.01?±?0.36 Ma and 26?±?7 Ma, respectively. Alkali basalts and basanites, nepheline syenites and phonolites, and silica saturated-to-oversaturated syenites, trachytes, granites and rhyolites are the main outcropping lithologies. These rocks have sodic affinity. The felsic rocks are dominant, and range from peraluminous to peralkaline. The mantle-normalized incompatible element patterns of the mafic lavas match those of Na-alkaline lavas in within-plate rift settings. The patterns are identical in shape and absolute concentrations to those of the Bobaomby (Cap d’Ambre) and Massif d’Ambre primitive volcanic rocks. These geochemical features are broadly compatible with variable degrees of partial melting of incompatible element-enriched mantle sources. The mineralogical and geochemical variations are consistent with fractional crystallization processes involving removal of olivine, feldspar, clinopyroxene, amphibole, Fe-Ti oxides and apatite. Removal of small amount of titanite explains the concave upward lanthanide pattern in the evolved nepheline syenites and phonolites, which are additionally rich in exotic silicates typical of agpaitic magmas (eudialyte, F-disilicates).
DS201506-0261
2015
Dannberg, J., Sobolev, S.V.Low-bouyancy thermochemical plumes resolve controversy of classical mantle plume concept.Nature Communications, Vol. 6, 6960 DOI: 10.1038 /ncomms7960MantleMagmatism
DS201512-1907
2015
D'Arpizio, C., Levato, F., Zito, D., De Montgolfier, J.Luxury goods worldwide market study Fall-Winter 2014.Bain & Company, Nov. 5, 38p. PdfGlobalDiamond market
DS201505-0232
2015
Das, J.N.Prospect of gemstones of India in 21st century.Geological Society of America Annual Meeting, Oct. 24, 1p. AbstractIndiaGemstones
DS201510-1764
2015
Das, R., Saikia, U., Rai, S.S.The deep geology of South India inferred from Moho depth and Vp/Vs ratio.Geophysical Journal International, Vol. 203, pp. 910-926.IndiaGeophysics - seismics

Abstract: We present a comprehensive study of thickness and composition of the crust; and the nature of crust-mantle boundary beneath Southern India using P-wave receiver function from 119 seismic stations. Data from distributed network of seismograph location encompass geological domains like mid to late Archean Dharwar craton, Archean and Proterozoic metamorphic terrains, Proterozoic basin, rifted margins and escarpments, and Deccan volcanics. Except for the mid to lower crust exhumed Archean terrains (of West Dharwar and Southern Granulite) all other geological domains have crustal thickness in the range 33-40 km. In the western Dharwar, crustal thickness increases from ?40 km in the north to over 50 km in the south. The Archean domain of granulite terrain is thicker (40-45 km) and more mafic compared to its counterpart in south deformed at 550 Ma. Most of the crustal blocks have low to moderate Vp/Vs (1.72-1.76) representing a felsic to intermediate composition. Exception to the above include Archean granulite terrain with high Vp/Vs (1.76–1.81) suggestive of more mafic crust beneath them. When accounted for the paleo burial depth of 15-25 km, the study suggests a possible Himalaya-Tibet like scenario beneath the mid-late Archean in southwestern Dharwar and north granulite terrain whose deeper crust has progressively densified. This led to a gradational crust-mantle transition that is otherwise sharp elsewhere. The study suggests a more homogenized and felsic nature of the Precambrian crust beneath the terrains formed after 2.6 Ga, possibly due to delamination of the mafic lower crust. Our study does not suggest any distinction between late Archean and Proterozoic crust. The Deccan volcanism at 65 Ma does not appear to have altered the crustal character beneath it and is similar to the adjoining late Archean east Dharwar craton. The western Ghat escarpment and the coastal plain formed due to separation of India from Madagascar are underlain by mafic lower crust.
DS201503-0140
2015
Dauteuil, O., Bessin, P., Guillocheau, F.Topographic growth around the Orange River valley, southern Africa: a Cenozoic record of crustal deformation and climatic change.Geomorphology, Vol. 233, March 15, pp. 5-19.Africa, South AfricaOrange River

Abstract: We reconstruct the history of topographic growth in southern Africa on both sides of the Orange River valley from an integrated analysis of erosion surfaces, crustal deformation and climate change. First, we propose an inventory of erosion surfaces observed in the study area and classify them according to their most likely formative process, i.e. chemical weathering or mechanical erosion. Among the various land units observed we define a new class of landform: the pedivalley, which corresponds to a wide valley with a flat erosional floor. In the Orange River valley, we mapped three low-relief erosion surfaces, each bevelling a variety of lithologies. The oldest and most elevated is (1) a stripped etchplain evolving laterally into (2) a stepped pediplain bearing residual inselbergs; (3) a younger pediplain later formed in response to a more recent event of crustal deformation. These are all Cenozoic landforms: the etchplain is associated with a late Palaeocene to middle Eocene weathering event, and the two pediplains are older than the middle Miocene alluvial terraces of the Orange River. Landscape evolution was first driven by slow uplift (10 m/Ma), followed by a second interval of uplift involving a cumulative magnitude of at least 200 m. This event shaped the transition between the two pediplains and modified the drainage pattern. A final phase of uplift (magnitude: 60 m) occurred after the Middle Miocene and drove the incision of the lower terraces of the Orange River. Climate exerted a major control over the denudation process, and involved very humid conditions responsible for lateritic weathering, followed by more arid conditions, which promoted the formation of pedivalleys. Collectively, these produce pediplains.
DS201509-0392
2015
Davies, C., Pozzo, M., Gubbins, D., Alfe, D.Constraints from material properties on the dynamics and evolution of Earth's core.Nature Geoscience, Vol. 8, pp. 678-785.MantleHT - core evolution

Abstract: The Earth’s magnetic field is powered by energy supplied by the slow cooling and freezing of the liquid iron core. Efforts to determine the thermal and chemical history of the core have been hindered by poor knowledge of the properties of liquid iron alloys at the extreme pressures and temperatures that exist in the core. This obstacle is now being overcome by high-pressure experiments and advanced mineral physics computations. Using these approaches, updated transport properties for FeSiO mixtures have been determined at core conditions, including electrical and thermal conductivities that are higher than previous estimates by a factor of two to three. Models of core evolution with these high conductivities suggest that the core is cooling much faster than previously thought. This implies that the solid inner core formed relatively recently (around half a billion years ago), and that early core temperatures were high enough to cause partial melting of the lowermost mantle. Estimates of core-mantle boundary heat flow suggest that the uppermost core is thermally stratified at the present day.
DS201512-1908
2015
Davies, D.R., Rawlinson, N., Iaffaldano, G., Campbell, I.H.Lithospheric controls on magma composition along Earth's longest continental hotspot track.Nature, Vol. 525, 7570, pp. 511-514.AustraliaCosgrove track

Abstract: Hotspots are anomalous regions of volcanism at Earth’s surface that show no obvious association with tectonic plate boundaries. Classic examples include the Hawaiian-Emperor chain and the Yellowstone-Snake River Plain province. The majority are believed to form as Earth’s tectonic plates move over long-lived mantle plumes: buoyant upwellings that bring hot material from Earth’s deep mantle to its surface1. It has long been recognized that lithospheric thickness limits the rise height of plumes2, 3, 4 and, thereby, their minimum melting pressure. It should, therefore, have a controlling influence on the geochemistry of plume-related magmas, although unambiguous evidence of this has, so far, been lacking. Here we integrate observational constraints from surface geology, geochronology, plate-motion reconstructions, geochemistry and seismology to ascertain plume melting depths beneath Earth’s longest continental hotspot track, a 2,000-kilometre-long track in eastern Australia that displays a record of volcanic activity between 33 and 9 million years ago5, 6, which we call the Cosgrove track. Our analyses highlight a strong correlation between lithospheric thickness and magma composition along this track, with: (1) standard basaltic compositions in regions where lithospheric thickness is less than 110 kilometres; (2) volcanic gaps in regions where lithospheric thickness exceeds 150 kilometres; and (3) low-volume, leucitite-bearing volcanism in regions of intermediate lithospheric thickness. Trace-element concentrations from samples along this track support the notion that these compositional variations result from different degrees of partial melting, which is controlled by the thickness of overlying lithosphere. Our results place the first observational constraints on the sub-continental melting depth of mantle plumes and provide direct evidence that lithospheric thickness has a dominant influence on the volume and chemical composition of plume-derived magmas.
DS201502-0052
2015
Day, J.M.D.Planet formation processes revealed by meteorites.Geology Today, Vol. 31, 1, pp. 12-20.TechnologyMeteorite
DC201501-1433
2014
De Beers Canada Inc.Gahcho Kue joint venture and NWT Metis Nation sign impact benefit agreement.De Beers Canada , Dec. 15, 2p.Canada, Northwest TerritoriesNews item - press release
DC201511-2374
2015
De Beers Canada Inc.De Beers Canada to move headquarters to Calgary from Toron to ( by June 2016)De Beers Canada, Oct. 16, 1/2p.CanadaNews item - De Beers
DC201502-1434
2014
De Beers GroupGahcho Kue joint venture and Deninu Kue First Nation sign impact benefit agreement.De Beers Group, Dec. 24, 1p.Canada, Northwest TerritoriesNews item - press release
DC201502-1435
2015
De Beers GroupDe Beers Group CEO steps out to support Forevermark "high impact" brand strategy.De Beers Group, Jan. 8, 1p.GlobalNews item - press release
DC201502-1436
2015
De Beers GroupDe Beers announces 2015 auction sales programme for forward contract sales.De Beers Group, Jan. 21, 1p.GlobalNews item - press release
DC201503-1440
2015
De Beers GroupInternational institute of diamond grading & research set for Indian roadshow.De Beers Group of Companies, Feb. 16, 1p.IndiaNews item - press release
DC201505-1441
2015
De Beers GroupPaul Rowley: we must all invest now to increase our future returns. VP of Global Sightholder Sales speaking at Dubai Diamond Conference.De Beers Group of Companies, Apr. 21, 1p. GlobalNews item - De Beers
DC201506-1437
2015
De Beers GroupDe Beers seeks expression of interest for Kimberley Mines tailings Operation.De Beers Group, May 21, 1p.Africa, South AfricaNews item - press release
DC201507-1438
2015
De Beers GroupReport to Society.. Building Forever 2014De Beers Group, June 5, GlobalNews item - press release
DC201507-1439
2015
De Beers GroupPhillippe Mellier: Sustainable returns across the diamond pipeline are key to investment.De Beers Group, June 16, 3p.GlobalNews item - De Beers
DC201508-1432
2015
De Beers GroupNamibia and De Beers reach agreement on Milestone 10 year diamond sales agreement.De Beers, July 21, 1p.Africa, NamibiaNews item - NDTC
DC201510-2338
2015
De Beers Group104 carat Forevermark diamond unveiled by long standing Forevermark Diamantaire … De Beers Group, Sept. 7, 1p.Hong KongNews item - Cullinan Heritage
DC201510-2339
2015
De Beers GroupInternational Institute of diamond grading & research to launch synthetic melee screening and referrals testing service in India.De Beers Group, Sept. 14, 1p.IndiaNews item - press release
DC201510-2340
2015
De Beers GroupDiamond industry fundamentals support long-term confidence in sector as India presents further growth opportunity.De Beers Group, Sept. 21, 1p.IndiaNews item - press release
DC201510-2341
2015
De Beers GroupDe Beers insight report 2015 - global consumer demand, rough diamond pipeline, in focus: the Indian consumer.De Beers Group, 44p.Global, IndiaNews item - demand, piepline, consumer
DC201511-2375
2015
De Beers GroupInternational Institute of diamond grading & research launches melee testing service. HDGR low cost-high volume.De Beers Group of Companies, Oct. 21, 1p.India, Europe, BelgiumNews item - De Beers
DC201512-2423
2015
De Beers GroupDe Beers to launch social campaign to honour inspirational women globally.news360.com, Nov. 10, 1/2p.GlobalNews item - De Beers
DC201512-2424
2015
De Beers GroupConnecting resources and society conference to be held in Botswana.De Beers Group of Companies, Nov. 13, 1p.Africa, BotswanaNews item - press release
DC201510-2342
2015
De Grey Mining Ltd.De Grey opts out of agreement to acquire interest in diamond project. IIIP Prospect PR 856 in Kimberley district.De Grey Mining Ltd., Sept. 8, 1p.Africa, South AfricaNews item - press release
DS201512-1909
2015
De Lamotte, F., Fourdan, D., Leleu, B., Leparmentier, S., Clarens, F.Style of rifting and the stages of Pangea.Tectonics, Vol. 34, 5, pp. 1009-1029.MantlePangea

Abstract: Pangea results from the progressive amalgamation of continental blocks achieved at 320?Ma. Assuming that the ancient concept of “active” versus “passive” rifting remains pertinent as end-members of more complex processes, we show that the progressive Pangea breakup occurred through a succession of rifting episodes characterized by different tectonic evolutions. A first episode of passive continental rifting during the Upper Carboniferous and Permian led to the formation of the Neo-Tethys Ocean. Then at the beginning of Triassic times, two short episodes of active rifting associated to the Siberian and Emeishan large igneous provinces (LIPs) failed. The true disintegration of Pangea resulted from (1) a Triassic passive rifting leading to the emplacement of the central Atlantic magmatic province (200?Ma) LIP and the subsequent opening of the central Atlantic Ocean during the lowermost Jurassic and from (2) a Lower Jurassic active rifting triggered by the Karoo-Ferrar LIP (183?Ma), which led to the opening of the West Indian Ocean. The same sequence of passive then active rifting is observed during the Lower Cretaceous with, in between, the Parana-Etendeka LIP at 135?Ma. We show that the relationships between the style of rifts and their breakdown or with the type of resulting margins (as magma poor or magma dominated) are not straightforward. Finally, we discuss the respective role of mantle global warming promoted by continental agglomeration and mantle plumes in the weakening of the continental lithosphere and their roles as rifting triggers.
DS201503-0141
2015
De Wit, M.C.J., Jelsma, H.A.A review of the kimberlites of the Democratic Republic of Congo.Geology and resource potential of the Congo Basin, Springer Regional Geology Reviews, Chapter 17, 9p.Africa, Democratic Republic of CongoOverview, history

Abstract: An overview is provided of the exploration history and geological setting of the kimberlites in the Democratic Republic of Congo (DRC). Exploration for diamonds, in what was then known as Congo Belge, started in 1900 and the first diamonds were found in 1903 in Shaba (now Katanga) Province, in 1907 in Kasai Occidental Province near Tshikapa Town and in 1918 in Kasai Oriental Province near Mbuji Mayi Town. While the Kundelungu kimberlites in Katanga Province were discovered in 1908, other kimberlite fields were discovered much later (Mbuji Mayi 1946; Tshibwe 1956; Bas-Congo 1974; Kasendou and Lukashi 2005), during exploration work by Forminière (Société Internationale Forestière et Minière du Congo-Tshikapa), MIBA (Societé Minière de Bakwanga-Mbuji Mayi), the De Beers Group and Bugeco S.A. Published age constraints on the kimberlites show Late Cretaceous ages for the Mbuji Mayi kimberlites (~70 Ma) and Eocene-Oligocene ages for the Kundelungu kimberlites (~32 Ma). Emplacement of the Late Cretaceous kimberlites (Mbuji Mayi, Tshibwe, Kasendou and Lukashi) was concomitant with the deposition of Cretaceous sedimentary sequences. The majority of the pipes show crater-facies preservation and some of the pipes are flared displaying so-called ‘champagne glass-shaped’ morphologies, suggesting emplacement into unconsolidated sediments overlying basement. The age of the Eocene-Oligocene Kundelungu kimberlites corresponds to lithospheric extension associated with the southward propagation of the East African Rift.
DS201503-0142
2015
De Wit, M.C.J., Thorose, E.Diamond bearing gravels along the lower Kwango River, DRC.Geology and resource potential of the Congo Basin, Springer Regional Geology Reviews, Chapter 16, 20p.Africa, Democratic Republic of CongoOverview, history

Abstract: Since the mid-1950s the Kwango River has been a major target for alluvial diamonds which are and continue to be mined from its terraces, younger river flats and present-day river channel. The terraces have maximum ages of Early to Middle Pleistocene. Most of the diamonds have been recovered from large diamond placers in and along the Angolan section of this river—the Cuango River. Smaller deposits have been worked further downstream, where the Kwango River forms the international border between Angola and the Democratic Republic of Congo (DRC), also referred to as the ‘international’ Kwango. The prospecting history of this river goes back to 1906 but a systematic exploration program over the lower Kwango was only initiated in 2005. The application of geophysics to explore the terrace deposits and river flats has been very useful, but a programme of drilling and pitting was required to accurately define gravel and overburden thicknesses, and outline palaeo-channels. A diamond study used to glean information on diamond sizes and characteristics added significant value to the understanding of these alluvial deposits. For most of the international Kwango, terraces and river flats overly aeolian facies of Upper Kwango Group. Basement rocks, providing more favourable sites for diamond concentrations, are only exposed over a relatively short section, just upstream from Tembo. The basal part of the Cretaceous Kwango Group is locally composed of chemically mature gravels with diamonds in economic quantities only proximal to primary sources and no such settings were found in the project area. The size frequency of the diamonds from the international Kwango indicates that these form the distal head of the diamond trail that have been eroded out of the Cretaceous Kwango Group sediments and kimberlites in the Upper Cuango basin in Angola since the Pleistocene. The diamonds below the two major waterfalls along the international Kwango near Tembo, the Guiliame and Francois-Joseph Falls, show a high percentage of breakage and a decline in average diamond size from around 0.25 cts/stn above the falls to between 0.07 and 0.1 cts/stn in the Nzasi Muadi to Kitangu area between 20 km and 130 km below the Falls. However, local variations due to geomorphological influences affect diamond concentrations and sizes. A preliminary assessment of the terrace deposits suggests that these are uneconomic at present using modern mining methods. This is largely due to thick overburden (up to 12 m of sand) combined with thin and hence low-volume, medium-grade basal gravel, and the dominance of small diamonds of lower value.
DS201509-0393
2015
De Wit, R.W.L., Trampert, J.Robust constraints on average radial lower mantle anisotropy and consequences for composition and texture.Earth and Planetary Science Letters, Vol. 429, pp. 101-109.MantleSeismic -anisotropy

Abstract: The seismic structure of Earth’s inner core is highly complex, displaying strong anisotropy and further regional variations. However, few seismic waves are sensitive to the inner core and fundamental questions regarding the origin of the observed seismic features remain unanswered. Thus, newtechniques to observe different types of inner corewaves are imperative to improve data coverage. Here, we detail our method for detecting exotic inner core phases such as PKJKP and PKIIKP, using inner core compressional waves as proof of concept.We use phase weighted stacking on long period data from a global distribution of stations, and employ several synthetic methods, including normal mode summation and SPECFEM, to identify and confirm the inner core phases. We present evidence for two observations of exotic inner core compressional waves, and apply the technique to a previously detected inner core shear wave. A possible new inner core shear wave remains unconfirmed. Additionally, we show how our method is important for rejecting potential observations, and distinguishing between waves with similar traveltime and slowness. The method is most successful for detecting exotic inner core compressional waves, and will provide a new approach for studying the compressional wave structures in the upper inner core.
DC201502-1442
2015
Debut Diamonds Inc.Debut Diamonds Inc. completes private placement. $ 50,000. ( Macfadyen and Good Friday pipes)Debut Diamonds Inc., Jna. 8, 1p.Canada, Ontario, AttawapiskatNews item - press release
DC201503-1443
2015
Debut Diamonds Inc.Debut Diamonds Inc. completes private placement. McFadyen Debut Diamonds Inc., Jan. 27, 1p.Canada, OntarioNews item - press release
DS201511-1830
2015
Decree, S., Boulvais, P., Tack, L., Andre, L., Baele, J-M.Fluorapatite in carbonatite-related phosphate deposits: the case of the Matongo carbonatite. ( Burundi)Mineralium Deposita, in press available 14p.Africa, BurundiCarbonatite

Abstract: The Matongo carbonatite intrusive body in the Neoproterozoic Upper Ruvubu alkaline plutonic complex (URAPC) in Burundi is overlain by an economic phosphate ore deposit that is present as breccia lenses. The ore exhibits evidence of supergene enrichment but also preserves textures related to the concentration of fluorapatite in the carbonatitic system. Magmatic fluorapatite is abundant in the ore and commonly occurs as millimeter-sized aggregates. It is enriched in light rare earth elements (LREE), which is especially apparent in the final generation of magmatic fluorapatite (up to 1.32 wt% LREE2O3). After an episode of metasomatism (fenitization), which led to the formation of K-feldspar and albite, the fluorapatite-rich rocks were partly brecciated. Oxygen and carbon isotope compositions obtained on the calcite forming the breccia matrix (?18O?=?22.1?- and ?13C?=??1.5?‰) are consistent with the involvement of a fluid resulting from the mixing of magmatic-derived fluids with a metamorphic fluid originating from the country rocks. In a subsequent postmagmatic event, the carbonates hosting fluorapatite were dissolved, leading to intense brecciation of the fluorapatite-rich rocks. Secondary carbonate-fluorapatite (less enriched in LREE with 0.07-0.24 wt% LREE2O3 but locally associated with monazite) and coeval siderite constitute the matrix of these breccias. Siderite has ?18O values between 25.4 and 27.7?- and very low ?13C values (from ?12.4 to ?9.2?, which are consistent with the contribution of organic-derived low ?13C carbon from groundwater. These signatures emphasize supergene alteration. Finally, the remaining voids were filled with a LREE-poor fibrous fluorapatite (0.01 wt% LREE2O3), forming hardened phosphorite, still under supergene conditions. Pyrochlore and vanadiferous magnetite are other minerals accumulated in the eluvial horizons. As a consequence of the supergene processes and fluorapatite accumulation, the phosphate ore, which contains 0.72 to 38.01 wt% P2O5, is also enriched in LREE (LaN/YbN from 47.1 to 83.5; ?REE between 165 and 5486 ppm), Nb (up to 656 ppm), and V (up to 1232 ppm). In the case of phosphate exploitation at Matongo, REE could prove to have a subeconomic potential to be exploited as by-products of phosphates.
DS201511-1831
2015
Deljanin, B., Alessandri, M., Peretti, A., Astrom, M.NDT breaking the 10 carat barrier: world record faceted and gem-quality synthetic diamonds.Contributions to Gemology, Vol. 15, pp. 1-7.TechnologySynthetics

Abstract: The first small manufactured industrial diamonds were produced in 1953 by the Swedish company ASEA but their accomplishment went unannounced. In 1970, General Electric (GE) produced synthetic diamond crystals using the HPHT method with a belt type of press and created a 0.78ct polished RBC colorless diamond. In the 1980’s and 1990’s Russians used their own technology (“BARS” and “TOROID” high pressure apparatus (HPA) with high pressure presses of up to 25 MN load) to grow industrial and crystals up to 2.00ct in polished size, mostly orange to yellow in colour. In the last 15 years, companies including Lucent, Chatham, AOTC, Gemesis (now IIa Technologies) and many other producers in China, Germany, India, Russia, Ukraine, USA and Taiwan have improved the technology yet again and used their expertise to successfully grow diamond crystals that cut to 1.00ct up to 2.00ct in size. This “next generation” of diamonds exhibited high clarities (VS and VVS) and colours (D-H), as well as new blue and pink colours (after irradiation). Other companies (ref. 2-3) including Scio Diamonds, Washington Diamonds, Taidiam, PDC diamonds and Pure Grown Diamonds (selling arm of IIa technologies) are also using a very different technology/process of Chemical Vapour Deposition (CVD) to produce laboratory-grown diamonds up to 3.00 ct in size (table 1).
DS201504-0192
2014
Delpit, S., Ross, P-S., Hearn, B.C.Deep bedded ultramafic diatremes in the Missouri River Breaks volcanic field, Montana, USA.Bulletin of Volcanology, Vol. 76, p. 832-United States, MontanaDiatreme
DS201506-0263
2015
DeStefano, A., Shiroki, A., Zhuk, V., Gaudet, M.Detailed studies of Renard 2 kimberlite - some practical aspects.Vancouver Kimberlite Cluster, May 27, 1/4p. AbstractCanada, QuebecDeposit - Renard
DM201511-2123
2015
Devenish, C.Charles is a strong environmenta list in India and asks that mining and agriculture support each other. Articles by Colin Todhunter ColinTodHunter.com, charlesdevenish @geomysore.comIndiaNews item - CSR
DS201502-0053
2010
deVera, J., Granado, P., McClay, K.Structural evolution of the Orange Basin gravity-driven system, offshore Namibia.Marine and Petroleum Geology, Vol. 27, 1, pp. 223-237.Africa, NamibiaStructure
DS201501-0006
2014
Devriese, S.G.R., Corcoran, N., Cowan, D., Davis, K., Bild-Enkin, D., Fournier, D., Heagy, L., Kang, S., Marchant, D., McMillan, M.S., Mitchell, M., Rosenkjar, G., Yang, D., Oldenburg, D.W.Magnetic inversion of three airborne dat a sets over the Tli Kwi Cho kimberlite complex.SEG Annual Meeting Denver, 5p. Extended abstractCanada, Northwest TerritoriesDeposit - Tli Kwi Cho, geophysics

Abstract: The magnetic and electromagnetic responses from airborne systems at Tli Kwi Cho, a kimberlite complex in the Northwest Territories, Canada, have received considerable attention over the last two decades but a complete understanding of the causative physical properties is not yet at hand. Our analysis is distributed among three papers. In the first, we find a 3D magnetic susceptibility model for the area; in the second, we find a 3D conductivity model; and in the third paper, we find a 3D chargeability model. Our goal is to explain all the geophysical results within a geologic framework. In this first paper, we invert three independent airborne magnetic data sets flown over the Tli Kwi Cho kimberlite complex located in the Lac de Gras kimberlite field in Northwest Territories, Canada. The complex consists of two kimberlites known as DO-27 and DO-18. An initial airborne DIGHEM survey was flown in 1992 and AeroTEM and VTEM data subsequently acquired in 2003 and 2004, respectively. In this paper, we invert each magnetic data set in three dimensions. Both kimberlites are recovered in each model, with DO-27 as a more susceptible body than DO-18. Our goal is to simultaneously invert the three data sets to generate a single susceptibility model for Tli Kwi Cho. This project is part of a larger, on-going investigation by UBC-GIF on inverting magnetic, electromagnetic, and induced polarization data from the Tli Kwi Cho area.
DS201503-0143
2015
Dey, S., Nandy, J., Choudhary, A.K., Liu, Y., Zong, K.Neoarchean crustal growth by combined arc-plume action: evidence from the Kadiri greenstone belt, eastern Dharwar craton, India.Geological Society of London Special Publication: Continent formation through time., No. 389, pp. 135-163.IndiaGeotectonics

Abstract: Field and geochemical studies combined with laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) zircon U-Pb dating set important constraints on the timing and petrogenesis of volcanic rocks of the Neoarchaean Kadiri greenstone belt and the mechanism of crust formation in the eastern Dharwar craton (EDC). The volcanic rocks are divided into three suites: tholeiitic basalts, calc-alkaline high-Mg# andesites and dominant dacites-rhyolites. The basalts (pillowed in places) show flat rare earth element (REE) and primordial mantle-normalized trace element patterns, but have minor negative Nb and Ta anomalies. They are interpreted as mantle plume-related oceanic plateau basalts whose source contained minor continental crustal input. The andesites are characterized by high Mg# (0.66-0.52), Cr and Ni, with depletion of high-field strength elements (HFSE) and enrichment of light REE (LREE) and large-ion lithophile elements (LILE). They were probably derived from a metasomatized mantle wedge overlying a subducted slab in a continental margin subduction zone. The dacites-rhyolites are silicic rocks (SiO2 = 61-72 wt%) with low Cr and Ni, K2O/Na2O mostly 0.5-1.1, highly fractionated REE patterns, enrichments of LILE and distinctly negative HFSE anomalies. One rhyolite sample yielded a zircon U-Pb age of 2353 ± 32 Ma. This suite is similar to potassic adakites and is explained as the product of deep melting of thickened crust in the arc with a significant older crustal component. Collision between a continental margin arc with an oceanic plateau followed by slab break-off, upwelling of hot asthenosphere and extensive crustal reworking in a sustained compressional regime is proposed for the geodynamic evolution of the area. This is in corroboration with the scenario of EDC as a Neoarchaean hot orogen as suggested recently by some workers.
DS201512-1910
2015
D'Haenens-Johansson, U.F.S., Katrusha, A., Moe, K.S., Johnson, P., Wang, W.Large colorless HPHT synthetic diamonds from new diamond technology. Using spectroscopic and gemological analysis.Gems & Gemology, Vol. 51, 3, pp. 260-79.TechnologySynthetics

Abstract: The Russian company New Diamond Technology is producing colorless and near-colorless HPHT-grown synthetic diamonds for the gem trade. Forty-four faceted samples synthesized using modified cubic presses were analyzed using a combination of spectroscopic and gemological techniques to characterize the quality of the material and determine the means of distinguishing them from natural, treated, and alternative laboratory-grown diamonds. These samples, with weights ranging from 0.20 to 5.11 ct, had color grades from D to K and clarity grades from IF to I2. Importantly, 89% were classified as colorless (D-F), demonstrating that HPHT growth methods can be used to routinely achieve these color grades. Infrared absorption analysis showed that all were either type IIa or weak type IIb, and photoluminescence spectroscopy revealed that they contained Ni-, Si-, or N-related defects. Their fluorescence and phosphorescence behavior was investigated using ultraviolet excitation from a long-wave/short-wave UV lamp, a DiamondView instrument, and a phosphorescence spectrometer. Key features that reveal the samples’ HPHT synthetic origin are described.
DS201508-0349
2015
Dhuime, B., Wuestefeld, A., Hawkesworth, C.J.Emergence of modern continental crust about 3 billion years ago.Nature Geoscience, Vol. 8, pp. 552-555.MantleGeochronology Rb/Sr
DC201507-1444
2015
Diamante Minerals, Inc.Diamante provides update on Mineracao Batovi diamond project.Diamante Minerals, Inc., June 5, 2p.South America, Brazil, Mato GrossoNews item - press release
DC201508-1445
2015
Diamante Minerals, Inc.Announces new chief financial officer. BatoviDiamante Minerals, Inc., July 9, 1p.South America, Brazil, Mato GrossoNews item - press release
DC201501-1446
2014
Diamcor Mining Inc.MD&A ended Sept. 30, 2014 - Corporate highlights Krone-Endora.Diamcor Mining Inc., Dec. 1, 1p.Africa, South AfricaNews item - press release
DC201501-1447
2014
Diamcor Mining Inc.Diamcor achieves significant milestone in second fiscal quarter. A full mining right from the South African Dept. of Minerals and resources in respect of Krone-Endora.Diamcor Mining Inc., Dec. 4, 2p.Africa, South AfricaNews item - press release
DC201502-1448
2014
Diamcor Mining Inc.Diamcor closes private placement of CDB $ 3,133,600 Diamcor Mining Inc., Dec. 31, 1p.Africa, South AfricaNews item - press release
DC201503-1449
2015
Diamcor Mining Inc.Diamcor commences expansion/ targets implementation. Krone-EndoraDiamcor Mining Inc., Feb. 5, 1p.Africa, South AfricaNews item - press release
DC201504-1450
2015
Diamcor Mining Inc.Diamcor third quarter fiscal 2015 results. Krone-EndoraDiamcor Mining Inc., Feb. 26, 2p.Africa, South AfricaNews item - press release
DC201505-1451
2015
Diamcor Mining Inc.Fourth quarter diamond sales and upgrade progress at Krone-Endor at Venetia.Diamcor Mining Inc., Apr. 15, 4p.Africa, South AfricaNews item - press release
DC201506-1452
2015
Diamcor Mining Inc.Diamcor files updated technical report for Krone-Endora at Venetia project.Diamcor Mining Inc., Apr. 28, 2p.Africa, South AfricaNews item - press release
DC201508-1453
2015
Diamcor Mining Inc.Diamcor first quarter diamond sales and operational update at Krone-Endora at Venetia.Diamcor Mining Inc., July 20, 2p.Africa, South AfricaNews item - press release
DC201511-2376
2015
Diamcor Mining Inc.Diamcor second fiscal quarter sales and operational update at Krone-Endora at Venetia.Diamcor Mining Inc., Oct. 6, 3p.Africa, South AfricaNews item - press release
DC201512-2425
2015
Diamcor Mining Inc.Diamcor preparing for largest rough diamond tender to date. Krone-EndoraDiamcor Mining Inc., Oct. 30, 1p.Africa, South AfricaNews item - press release
DC201507-1454
2015
Diamond Fields International Ltd.Diamond Fields International restarts Namibian diamond operations.Diamond Fields International Ltd., June 5, 1p.Africa, NamibiaNews item - press release
DC201512-2426
2015
Diamond Fields International Ltd.Diamond Fields is pleased to announce that offshore marine sampling operations have begun ML-111Diamond Fields International Ltd., Nov. 16, 1p.Africa, NamibiaNews item - press release
DM201512-2326
2015
Diamond Intelligence BriefingDe Beers defers its own Debswana rough purchases.Diamond Intellgence Briefing, Nov. 12, 7p.Africa, BotswanaNews item - De Beers
DM201502-0544
2015
Diamond Investing NewsWhat are nanodiamonds ( outline for the layman)Diamond Investing News, Jan. 1, 1p.TechnologyNews item - nanodiamonds
DM201504-0545
2015
Diamond Investing NewsTrans Hex announces an update of latest diamond sales and production.Diamond Investing News, Mar. 5, 1/4p.Africa, South AfricaNews item - Trans Hex
DM201507-0546
2015
Diamond Investing News5 top industrial diamond producing countries ( DRC, Russia, Australia, Botswana, South Africa)diamondinvestingnews.com, June 18, 2p.GlobalNews item - industrial diamonds
DM201508-2466
2015
Diamond Investing newsHigh hopes for Lucara Diamond's first 2015 exceptional stone tender.Diamond Investing News, July 13, 1p.Africa, BotswanaNews item - Lucara
DM201511-2208
2015
Diamond Investing NewsCan miners buck the diamond price trend 2015?Diamond Investing News, Oct. 19, 2p.GlobalNews item - prices
DC201509-1456
2015
DiamondCorp plc.Lace diamond mine project update. Upper K4 unit.DiamondCorp plc., July 31, 4p.Africa, South AfricaNews item - press release
DC201510-2343
2015
DiamondCorp Plc.Interim results…. Lace mine.DiamondCorp Plc., Sept. 1, 4p.Africa, South AfricaNews item - press release
DC201511-2377
2015
DiamondCorp Plc.Conveyor belt installation complete ( 400 tonne per hour) at Lace mine.DiamondCorp. Plc, Oct. 13, 2p.Africa, South AfricaNews item - press release
DC201512-2427
2015
DiamondCorp plc.Lace diamond mine project update … detailed.DiamondCorp plc, Nov. 3, 1p.Africa, South AfricaNews item - press release
DC201512-2428
2015
DiamondCorp plc.Conveyor belt commissioned. Lace mineDiamondCorp plc, Nov. 12, 1p.Africa, South AfricaNews item - press release
DC201512-2429
2015
DiamondCorp plc.Lace mine - 290m level development resumes.DiamondCorp plc, Nov. 20, 1p.Africa, South AfricaNews item - press release
DS201512-1911
2015
Diamonds in CanadaBig changes at De Beers Canada.. New CEO discusses HQ move to Calgary.Diamonds in Canada Magazine, Northern Miner, Nov. pp. 18-19.Canada, AlbertaDe Beers Headquarters
DS201512-1912
2015
Diamonds in CanadaStornoway benefits from 'good timing'. Renard on track for commercial production in 2017.Diamonds in Canada Magazine, Northern Miner, Nov. pp. 20-21.Canada, QuebecDeposit - Renard
DS201512-1913
2015
Diamonds in CanadaSable PEA sweetens Ekati. Dominion works to add mine life to operation.Diamonds in Canada Magazine, Northern Miner, Nov. 22-23.Canada, Northwest TerritoriesDeposit - Sable
DM201501-0547
2014
Diamonds.netAnjin's failed promise turns former Marange nonagenarian destitute.Diamonds.net, Dec. 1, 1/4p.Africa, ZimbabweNews item - Anjin
DM201501-0548
2014
Diamonds.netSierra Leone issues investor statement on Sunergy Inc. License from NWA false. Diamonds.net, Dec. 1, 1/4p.Africa, Sierra LeoneNews item - Sunergy
DM201501-0549
2014
Diamonds.netFirestone on track to commence Liquobong production in 2Q 2016.Diamonds.net, Dec. 2, 1/4p.Africa, LesothoNews item - Firestone
DM201501-0550
2014
Diamonds.netArgyle Champagne diamond raises money for women in mining internship.Diamonds.net, Dec. 4, 1/4p.Global, EnglandNews item - Argyle, Rio Tinto
DM201501-0551
2014
Diamonds.netThe diamond decade so far. Diamonds.net, Dec. 5, 2p.GlobalNews item - history
DM201501-0552
2014
Diamonds.netLiori Diamonds engagement survey shows growing interest in black diamonds.Diamonds.net, Dec. 3, 1p.GlobalNews item - Liori
DM201501-0553
2014
Diamonds.netVenezuela adds diamonds to financial reserves to strengthen security and currency. Withdrew from KP in 2008. No Venezuelan reports to date ( suspected smuggling through Brazil and Guyana).Diamonds.net, Dec. 5, 1/4p.South America, VenezuelaNews item - legal
DM201501-0554
2014
Diamonds.netPresident Putin, Prime Minister Modi to address World Diamond Conference.Diamonds.net, Dec. 7, /4p.IndiaNews item - GJEPC
DM201501-0555
2014
Diamonds.netLace mine workers end strike, resume work on Dec. 8.Diamonds.net, Dec. 7, /4p.Africa, South AfricaNews item - DiamondCorp
DM201501-0556
2014
Diamonds.netStellar Diamonds prepares Baoule rough for sale in Antwerp.Diamonds.net, Dec. 4, 1/4p.Africa, GuineaNews item - Stellar
DM201501-0557
2014
Diamonds.netDiamond explorer ( Delrand) votes on plan to sell Congo Licenses for $1Diamonds.net, Dec. 7, /4p.Africa, Democratic Republic of CongoNews item - Delrand
DM201501-0558
2014
Diamonds.netConsumers starting to embrace lab-grown diamonds.Diamonds.net, Dec. 7, /4p.TechnologyNews item - Diamaz International
DM201501-0559
2014
Diamonds.netAWDC and Bain & Co. release fourth annual diamond industry report. SEE Technical refs for full report ref.Diamonds.net, Dec. 9, 1/4p.GlobalNews item - Bain
DM201501-0560
2014
Diamonds.netBelgium's competition authority dismisses Spira's complaint against De Beers.Diamonds.net, Dec. 8, 1/4p.Europe, BelgiumNews item - De Beers
DM201501-0561
2014
Diamonds.netRio Tinto's Partnership model to drive diamond jewelry growth in India.Diamonds.net, Dec. 11, 1/4p.IndiaNews item - Rio Tinto
DM201501-0562
2014
Diamonds.netLucara sets top revenue target at $ 240 million for 2015.Diamonds.net, Dec. 11, 1/4p.Africa, BotswanaNews item - Lucara
DM201501-0563
2014
Diamonds.netAlrosa takes measures to improve liquidity.Diamonds.net, Dec. 12, 1/4p.RussiaNews item - Alrosa
DM201501-0564
2014
Diamonds.netSightholders reject goods at $600 m December De Beers sight.Diamonds.net, Dec. 16, 1/4p.GlobalNews item - De Beers
DM201501-0565
2014
Diamonds.netCote d'Ivoire resumes diamond trade with Belgian help.Diamonds.net, Dec. 16, 1/4p.Africa, Ivory CoastNews item - KP
DM201501-0566
2014
Diamonds.netGahcho Kue operators sign impact agreement with Metis Nation.Diamonds.net, Dec. 15, 1/4p.Canada, Northwest TerritoriesNews item - De Beers, Mountain Province
DM201501-0567
2014
Diamonds.netNasdaq approves listing for Mountain Province Diamonds.Rough-Polished.com, Dec. 19, 1/4p.Canada, Northwest TerritoriesNews item - Mountain Province
DM201501-0568
2014
Diamonds.netLucapa to start alluvial mining at Lulo in January.Diamonds.net, Dec. 18, 1/4p.Africa, AngolaNews item - Lucapa
DM201502-0569
2014
Diamonds.netDiamond grade improves in the latest Kelvin mini-bulk sample.Diamonds.net, Dec. 24, 1/4p.Canada, Northwest TerritoriesNews item - Kennady
DM201502-0570
2014
Diamonds.netDecree taps Alrosa, Kristall to reduce foreign currency holdings.Diamonds.net, Dec. 24, 1/4p.RussiaNews item - Alrosa, Kristall
DM201502-0571
2014
Diamonds.netPeregrine Diamonds placement to raise $ 2 million.Diamonds.net, Dec. 22, 1/4p.Canada, Nunavut, Baffin IslandNews item - Peregrine
DM201502-0572
2014
Diamonds.netLukoil targets production of 2 million carats in 2015.Diamonds.net, Dec. 29, 1/4p.Russia, Kola Peninsula, ArchangelNews item - Lukoil
DM201502-0573
2014
Diamonds.netSRK signs supply contract with Alrosa. Diamonds.net, Dec. 29, 1/4p.RussiaNews item - SRK, Alrosa
DM201502-0574
2014
Diamonds.netThe diamond story of 2014…. Reduction of bank credit available is a game changer.Diamonds.net, Dec. 26, 4p.GlobalNews item - economics
DM201502-0575
2014
Diamonds.netMbada Diamonds workers picket for unpaid salary.Diamonds.net, Dec. 24, 1/4p.Africa, ZimbabweNews item - Mbada
DM201502-0576
2014
Diamonds.netRussia orders Alrosa, Kristall to sell foreign currency.Diamonds.net, Dec. 23, 1/4p.RussiaNews item - Alrosa, Kristall
DM201502-0577
2014
Diamonds.netSarine delivers its first Galaxy ultra microscopic inclusion mapping service.Diamonds.net, Dec. 30, 1/4p.TechnologyNews item - Sarine
DM201502-0578
2015
Diamonds.netStellar Diamonds postpones first Baoule diamond sale to late January.Diamonds.net, Jan. 7, 1/4p.Africa, GuineaNews item - Stellar
DM201502-0579
2015
Diamonds.netWDC website posts system of warranties guidelines.Diamonds.net, Jan.7, 1/4p.TechnologyNews item - WDC
DM201502-0580
2015
Diamonds.netRio Tinto's 4 Q diamond production -37%. Argyle and DiavikDiamonds.net, Jan. 20, 1/4p.Australia, Canada, Northwest TerritoriesNews item - Rio Tinto
DM201502-0581
2015
Diamonds.netAdvanced HPHT takes lab grown diamonds to new level. One carat flawlessDiamonds.net, Jan. 20, 1/4p.TechnologyNews item - Diamaz International
DM201502-0582
2015
Diamonds.netLucapa receives $ 15 m bridge financing. LuloDiamonds.net, Jan. 23, 1/4p.Africa, AngolaNews item - Lucapa
DM201502-0583
2015
Diamonds.netOkavango Diamond Company completed first year in business.Diamonds.net, Jan. 23, 1/4p.Africa, BotswanaNews item - Okavango
DM201502-0584
2015
Diamonds.netPetra's 1 H production -2% to 1.6 m carats.Diamonds.net, Jan. 26, 1/4p.Africa, South AfricaNews item - Petra
DM201502-0585
2015
Diamonds.netRio Tinto publishes 17 select diamantaires for 2015.Diamonds.net, Jan. 26, 1/4p.GlobalNews item - Rio Tinto
DM201503-0586
2015
Diamonds.netGIA revises colored stone reports.Diamonds.net, Jan. 29, 1/4p.TechnologyNews item - GIA
DM201503-0587
2015
Diamonds.netAlrosa plans 2015 production +5% to 40 m carats.Diamonds.net, Jan. 29, 1/4p.RussiaNews item - Alrosa
DM201503-0588
2015
Diamonds.netGem Diamonds Letseng sales - 10% in 4Q.Diamonds.net, Jan. 27, 1p.Africa, LesothoNews item - Gem Diamonds
DM201503-0589
2015
Diamonds.netDe Beers January sight estimated at $ 450 M.Diamonds.net, Jan. 27, 1p.GlobalNews item - De Beers
DM201503-0590
2015
Diamonds.netDiamond Corp reports $ 1.4 m sales in 2014.Diamonds.net, Feb. 1, 1/4p.Africa, South AfricaNews item - DiamondCorp
DM201503-0591
2015
Diamonds.netUS says Edwards sane enough to stand trial in diamond fraud case.Diamonds.net, Jan. 30, 1/4p.United StatesNews item - CMKM
DM201503-0592
2015
Diamonds.netMinister urges Zimbabwe's youth to take charge of diamond mining. ChiadzwaDiamonds.net, Jan 30, 1/4p.Africa, ZimbabweNews item - legal
DM201503-0593
2015
Diamonds.netNew Zimbabwe tax scheme makes Murowa unprofitable.Diamonds.net, Jan. 30, 1/4p.Africa, ZimbabweNews item - legal
DM201503-0594
2015
Diamonds.netHeavy traffic expected on Canada's diamond ice road.Diamonds.net, Feb. 3, 1/4p.Canada, Northwest TerritoriesNews item - ice road
DM201503-0595
2015
Diamonds.netAlrosa expects to sell 2 m carats from inventory in 2015.Diamonds.net, Feb. 4, 1/4p.RussiaNews item - Alrosa
DM201503-0596
2015
Diamonds.netAlrosa, Israel sign cooperation agreement… exchange of expertiseDiamonds.net, Feb. 9, 1/4p.Russia, Europe, IsraelNews item - Alrosa
DM201503-0597
2015
Diamonds.netMinister is unimpressed with diamond miners, tells NGOs to stay out of politics.Diamonds.net, Feb. 9, 1/4p.Africa, ZimbabweNews item - legal
DM201503-0598
2015
Diamonds.netKennady Diamonds private placement to raise $ 16 m.Diamonds.net, Feb. 9, 1/4p.Canada, Northwest TerritoriesNews item - Kennady
DM201503-0599
2015
Diamonds.netNorth Arrow's drilling program is underway at the Pikoo diamond project.Diamonds.net, Feb. 11, 1/4p.Canada, SaskatchewanNews item - North Arrow
DM201503-0600
2015
Diamonds.netAlrosa relaxes client sales volume requirements but not prices.Diamonds.net, Feb. 11, 1/4p.RussiaNews item - Alrosa
DM201503-0601
2015
Diamonds.netRio Tinto's diamond revenue +6 % to $901 m in 2014.Diamonds.net, Feb. 12, 1/4p.GlobalNews item - Rio Tinto
DM201503-0602
2015
Diamonds.netStable rough diamond production.Diamonds.net, Feb. 6, 2p.GlobalNews item - production
DM201503-0603
2015
Diamonds.netDe Beers profit, revenue soar in 2014. 74% jump to $ 923 million.Diamonds.net, Feb. 13, 1/4p.GlobalNews item - De Beers
DM201503-0604
2015
Diamonds.netSotheby's to offer 100 carat emerald cut diamond at April auction. Dubbed the "Ultimate emerald cut diamond". De Beers stone mined in southern Africa.Diamonds.net, Feb. 13, 1/4p.TechnologyNews item - diamond notable
DM201503-0605
2015
Diamonds.netDiamond Corp secures wage agreement for Lace mine workers.Diamonds.net, Feb. 18,1 /4p.Africa, South AfricaNews item - DiamondCorp
DM201503-0606
2015
Diamonds.netDiavik Diamond Mines, Crossworks Manufacturing sponsor Yellowknife Gala.Diamonds.net, Feb. 20, 1/4p.Canada, Northwest TerritoriesNews item - Diavik
DM201503-0607
2015
Diamonds.netAlrosa seeks to buy 33% of Catoca production.Diamonds.net, Feb. 19, 1/4p.Africa, Angola, RussiaNews item - Alrosa
DM201504-0608
2015
Diamonds.netLucapa clears bridge loan requirements and raises $ 5 million.Diamonds.net, Mar.3, 1p.Africa, AngolaNews item - Lucapa
DM201504-0609
2015
Diamonds.netAverage rough prices drop for Trans Hex.Diamonds.net, Mar.3, 1/4p.Africa, South AfricaNews item - Trans Hex
DM201504-0610
2015
Diamonds.netGIA & De Beers to speak on synthetic diamonds March 22. Panel discussion at GIADiamonds.net, Mar.3, 1/4p.United StatesNews item - synthetics
DM201504-0611
2015
Diamonds.netDe Beers Feb. sight estimated at $ 550 million.Diamonds.net, Mar. 3, 1/4p.GlobalNews item - De Beers
DM201504-0612
2015
Diamonds.netZimbabwe prepares for no diamond revenue in 2015.Diamonds.net, Mar. 6, 1/4p.Africa, ZimbabweNews item - legal
DM201504-0613
2015
Diamonds.netDiamond miners meet to set up consumer promotion body. Rio Tinto, De Beers, Alrosa, Petra, Gem, Lucara, Dominion, LuKoilDiamonds.net, Mar. 9, 1/4p.GlobalNews item - promo
DM201504-0614
2015
Diamonds.netAlrosa feels weaker demand, sizable inventory levels in the pipeline.Diamonds.net, Mar. 10, 1/4p.RussiaNews item - Alrosa
DM201504-0615
2015
Diamonds.netChidhakwa's plan creates just one diamond miner in Marange.Diamonds.net, Mar. 13, 1/4p.Africa, ZimbabweNews item - legal
DM201504-0616
2015
Diamonds.netTurkey targets growth in diamond trading.Diamonds.net, Mar. 13, 1/4p.Europe, TurkeyNews item - jewellery
DM201504-0617
2015
Diamonds.netAntwerp diamond industry launches offensive in Latin America. Brazil in particular.Diamonds.net, Mar. 11, 1p.South America, BrazilNews item - markets
DM201504-0618
2015
Diamonds.netSarine debuts its profile technology.Diamonds.net, Mar. 16, 1/4p.TechnologyNews item - Sarine
DM201504-0619
2015
Diamonds.netRussian diamond sales unaffected by economic crisis.Diamonds.net, Mar. 16, 1/4p.RussiaNews item - Alrosa
DM201504-0620
2015
Diamonds.netZimbabwe lost $ 12 billion to illegal multinational business practices.Diamonds.net, Mar. 18, 1/4p.Africa, ZimbabweNews item - legal
DM201504-0621
2015
Diamonds.netDe Beers upgrades DiamondView.Diamonds.net, Mar. 18, 1/4p.TechnologyNews item - DiamondView
DM201504-0622
2015
Diamonds.netGem Diamonds profit +57% to $ 33 m in 2014.Diamonds.net, Mar. 17, 1/4p.Africa, LesothoNews item - Gem Diamonds
DM201504-0623
2015
Diamonds.netFancy Color Research Foundation launches mobile website.Diamonds.net, Mar. 19, 1/4p.TechnologyNews item - FCRF
DM201504-0624
2015
Diamonds.netAlrosa reports liss in 2014, revenu + 23% ( foreign exchange loss)Diamonds.net, Mar. 23, 1/4p.RussiaNews item - Alrosa
DM201504-0625
2015
Diamonds.netYellow diamond leads Sotheby's HK spring sale.Diamonds.net, Mar. 23, 1/4p.GlobalNews item - diamond notable
DM201504-0626
2015
Diamonds.netJourna list faces defamation trial for exposing Angolan diamonds abuses. Marquis de MoraisDiamonds.net, Mar. 22, 1p.Africa, AngolaNews item - legal
DM201504-0627
2015
Diamonds.netDe Beers to open first diamond grading institute in Surat.Diamonds.net, Mar. 23, 1/4p.IndiaNews item - De Beers
DM201504-0628
2015
Diamonds.netMerlin Diamonds receives $ 5 million to restart production. ( Govt tax refund).Diamonds.net, Mar. 23, 1/4p.AustraliaNews item - Merlin
DM201504-0629
2015
Diamonds.netAngolan court slaps additional charges on Marques de Morais ( exposed corruption in diamond industry in Angola).Diamonds.net, Mar. 25, 1/4p.Africa, AngolaNews item - legal
DM201504-0630
2015
Diamonds.netGA adopts Sarine's Instructor as standard software.Diamonds.net, Mar. 25, 1/4p.TechnologyNews item - Sarine
DM201504-0631
2015
Diamonds.netDiamond smuggling thrives in CAR.Diamonds.net, Mar. 25, 1/4p.Africa, Central African RepublicNews item - legal
DM201505-0632
2015
Diamonds.netTeeling says diamonds shine in a resource world filled with gloom.Diamonds.net, Mar. 27, 1/4p.GlobalNews item - Botswana Diamonds
DM201505-0633
2015
Diamonds.netStellar Diamonds narrows loss, seeks to raise $ 20 m.Diamonds.net, Mar. 27, 1/4p.Africa, Guinea, Sierra LeoneNews item - Stellar
DM201505-0634
2015
Diamonds.netABN Amro … diamond industry lacks bankability, not liquidity.Diamonds.net, Mar. 27, 1/4p.GlobalNews item - ABN Amro
DM201505-0635
2015
Diamonds.netABN AMRO returns to India.Diamonds.net, Mar. 26, 1/4p.IndiaNews item - ABN Amro
DM201505-0636
2015
Diamonds.netDe Beers announces 84 sightholders.Diamonds.net, Mar. 31, 1/4p.GlobalNews item - De Beers
DM201505-0637
2015
Diamonds.netRefusals exceed 30% at De Beers March sight.Diamonds.net, Mar. 31, 1/4p.GlobalNews item - De Beers
DM201505-0638
2015
Diamonds.netBelgian court returns diamonds to Zimbabwe. Diamonds.net, Mar. 31, 1/4p.Africa, Zimbabwe, BelgiumNews item - legal
DM201505-0639
2015
Diamonds.netGIA's Dreams of Diamonds exhibit comes to southern California. Seven of world's finest diamond houses to showcase exceptionally rare diamonds……Diamonds.net, Apr. 2, 1/4p.United States, CaliforniaNews item - GIA exhibit
DM201505-0640
2015
Diamonds.netZimbabwe's Vice President Mnangagwa colluded with the army and Chinese .. Accused of stealing diamonds.Diamonds.net, Apr. 1, 1/4p.Africa, ZimbabweNews item - legal
DM201505-0641
2015
Diamonds.netProduction drops over refinancing difficulty in 2014. Diamonds.net, Apr. 1, 1/4p.Russia, YakutiaNews item - Alrosa
DM201505-0642
2015
Diamonds.netMugabe taps reserve bank to stop diamond smuggling.Diamonds.net, Apr. 4, 1/4p.Africa, ZimbabweNews item - legal
DM201505-0643
2015
Diamonds.netContrasting quarters … 2014 and 2015. Cause and effect.Diamonds.net, Apr. 4, 1p.GlobalNews item - prices
DM201505-0644
2015
Diamonds.netChidhakwa faces pressure to deliver diamond royalties.Diamonds.net, Apr. 9, 1/4p.Africa, ZimbabweNews item - legal
DM201505-0645
2015
Diamonds.netLucapa recovers a 63 ct diamond from Lulo.Diamonds.net, Apr. 17, 1/4p.Africa, AngolaNews item - Lucapa
DM201505-0646
2015
Diamonds.netPetra's revenue - 41% to $ 96 m in 3 Q.Diamonds.net, Apr. 16, 1/4p.Africa, South AfricaNews item - Petra
DM201505-0647
2015
Diamonds.netSeveralmaz appoints Pismenny as CEO. Diamonds.net, Apr. 16, 1/4p.Russia, Kola Peninsula, ArchangelNews item - Severalmaz
DM201505-0648
2015
Diamonds.netDiamcor's rough sale achieves $ 842 K ( Krone-Endora)Diamonds.net, Apr. 15, 1/4p.Africa, South AfricaNews item - Diamcor
DM201505-0649
2015
Diamonds.netNGOs urge Zimbabwe to consult with stakeholders in Marange merger.Diamonds.net, Apr. 15, 1/4p.Africa, ZimbabweNews item - legal
DM201505-0650
2015
Diamonds.netOGI debuts symmetry leakage technology. Diamonds.net, Apr. 20, 1/4p.TechnologyNews item - OGI
DM201505-0651
2015
Diamonds.netInvestigators probe Marange diamond firm Ji nan for transferring $ 546 million.Diamonds.net, Apr. 17, 1/4p.Africa, ZimbabweNews item - Jinan
DM201505-0652
2015
Diamonds.netLucapa's third sale of Lulo production achieves $ 790K.Diamonds.net, Apr. 22, 1/4p.Africa, AngolaNews item - Lucapa
DM201505-0653
2015
Diamonds.netAlrosa's first quarter diamond production + 14%.Diamonds.net, Apr. 21, 1/4p.RussiaNews item - Alrosa
DM201506-0654
2015
Diamonds.netPetra Diamonds launches $300 miln notes issue to fund Culli nan construction.Diamonds.net, Apr. 24, 1/4p.Africa, South AfricaNews item - Petra
DM201506-0655
2015
Diamonds.netZimbabwe diamond centre to open in phases ( machinery sourced from India).Diamonds.net, Apr. 24, 1/4p.Africa, ZimbabweNews item - Diamond Centre
DM201506-0656
2015
Diamonds.netResidents fear consolidation releases Marange firms from broken promises.Diamonds.net, Apr. 23, 1/4p.Africa, ZimbabweNews item - Marange
DM201506-0657
2015
Diamonds.netBank executives tell diamond industry that risk hinders financing.Diamonds.net, Apr. 23, 1/4p.GlobalNews item - economics
DM201506-0658
2015
Diamonds.netDiamcor achieves $ 5 m in revenue from Krone-Endora since 2013.Diamonds.net, Apr. 29, 1/4p.Africa, South AfricaNews item - Diamcor
DM201506-0659
2015
Diamonds.netDebmarine names new vessel after Nujoma.Diamonds.net, Apr. 28, 1/4p.Africa, NamibiaNews item - Debmarine
DM201506-0660
2015
Diamonds.netScio Diamond to double production levels. Diamonds.net, Apr. 27, 1/4p.TechnologyNews item - Scio
DM201506-0661
2015
Diamonds.netLace mine to ramp up production in second half of 2015.Diamonds.net, Apr. 30, 1/4p.Africa, South AfricaNews item - DiamondCorp
DM201506-0662
2015
Diamonds.netDisciplined diamantaires ….Diamonds.net, May 1, 1/4p.GlobalNews item - legal
DM201506-0663
2015
Diamonds.netZimbabwe's local cutters face total lack of supply.Diamonds.net, May 7, 1/4p.Africa, ZimbabweNews item - cutting
DM201506-0664
2015
Diamonds.netUnchecked private jets deliver Marange diamonds to Dubai, Hong Kong.Diamonds.net, May 6, 1/4p.Africa, ZimbabweNews item - Marange
DM201506-0665
2015
Diamonds.netMarket correction: diamond markets under pressure. Martin Rapaport discussion.Diamonds.net, May 8, 8p.GlobalNews item - prices and markets
DM201506-0666
2015
Diamonds.netLucara's revenue -10%, profit +18% in 1Q. KaroweDiamonds.net, May 12, 1/4p.Africa, BotswanaNews item - Lucara
DM201506-0667
2015
Diamonds.netVictor mine's royalties total $ 226 for the 2013 and 2014 period.Diamonds.net, May 12, 1/4p.Canada, OntarioNews item - De Beers
DM201506-0668
2015
Diamonds.netZimbabwe's production value -23% in 2014 to $ 350 million -Marange Diamonds.net, May 15, 1/4p.Africa, ZimbabweNews item - economics
DM201506-0669
2015
Diamonds.netZimbabwe's green diamonds remain a risk for U.S. traders.Diamonds.net, May 13, 1/4p.Africa, ZimbabweNews item - KP
DM201506-0670
2015
Diamonds.netZimbabwe's diamond mining consolidation plan in limbo.Diamonds.net, May 18, 1/4p.Africa, ZimbabweNews item - legal
DM201506-0671
2015
Diamonds.netU.S. reiterates rough diamond suspension on Venezuela, CAR.Diamonds.net, May 18, 1/4p.Africa, Central African Republic, South America, VenezuelaNews item - KP
DM201506-0672
2015
Diamonds.netShore Gold to raise $ 2 mill in private placement. OrionDiamonds.net, May 20, 1/4p.Canada, SaskatchewanNews item - Shore Gold
DM201506-0673
2015
Diamonds.netLucapa's fourth parcel sale from Lulo generates $ 2m.Diamonds.net, May 19, 1/4p.Africa, AngolaNews item - Lucapa
DM201506-0674
2015
Diamonds.netDominion Diamonds's 1 Q rough diamond sales+ 7%.Diamonds.net, May 22, 1/4p.Canada, Northwest TerritoriesNews item - Dominion
DM201507-0675
2015
Diamonds.netIGI certifies 10 carat diamond grown with new technology. ( New Diamond Technology lab Russia fashioned from 32.36 carat man made rough)Diamonds.net, May 26, 1/4p.TechnologyNews item - New Diamond Technology LLC
DM201507-0676
2015
Diamonds.netStellar Diamonds achieved $ 505,000 from its recent sale of rough diamonds from the Baoule project in Guinea.Diamonds.net, May 28, 1/4p.Africa, GuineaNews item - Stellar
DM201507-0677
2015
Diamonds.netPhillippe Mellier's speech transcript from JCK talks series.Diamonds.net, May 30, 1/4p.GlobalNews item - De Beers
DM201507-0678
2015
Diamonds.netDe Beers re-launch 'A diamond is forever' campaign.Diamonds.net, May 29, 1/4p.GlobalNews item - De Beers
DM201507-0679
2015
Diamonds.netDominion launches CanadaMark B2B trading platform.Diamonds.net, June 2, 1/4p.Canada, Northwest TerritoriesNews item - Dominion
DM201507-0680
2015
Diamonds.netOkavango diamond sales volume -20% so far in 2015.Diamonds.net, June 1, 1/4p.Africa, BotswanaNews item - Okavango
DM201507-0681
2015
Diamonds.netRockwell's revenue +19%, loss widens 6%.Diamonds.net, June 1, 1/4p.Africa, South AfricaNews item - Rockwell
DM201507-0682
2015
Diamonds.netDiamond Corp raises $ 5 m., proposes another $ 3 m 'open offer' placement. LaceDiamonds.net, June 5, 3p.Africa, South AfricaNews item - DamondCorp
DM201507-0683
2015
Diamonds.netLucapa ramping up Angola alluvial production, kimberlite exploration.Diamonds.net, June 5, 1/4p.Africa, AngolaNews item - Lucapa
DM201507-0684
2015
Diamonds.netTrans Hex Group FY revenue +35%, profit soars.Diamonds.net, June 4, 1/4p.Africa, South AfricaNews item - Trans Hex
DM201507-0685
2015
Diamonds.netWeak ruble boosts Alrosa revenue, profit in 1 Q.Diamonds.net, June 4, 1/4p.RussiaNews Item - Alrosa
DM201507-0686
2015
Diamonds.netIllegal rough trade flourishes despite CAR's embargo.Diamonds.net, June 8, 1/4p.Africa, Central African RepublicNews item - legal
DM201507-0687
2015
Diamonds.netAWDC, diamond admin. Of Chin a sign cooperative agreement.Diamonds.net, June 4, 1/4p.China, BelgiumNews item - AWDC
DM201507-0688
2015
Diamonds.netConfidence in the diamond dream. ForevermarkDiamonds.net, June 12, 1/4p.GlobalNews item - De Beers
DM201507-0689
2015
Diamonds.netMustang Resources recovers diamonds in Mozambique.Diamonds.net, June 16, 1/2p.Africa, MozambiqueNews item - Mustang
DM201507-0690
2015
Diamonds.netIsrael's diamond leaders call for reduced rough supply.Diamonds.net, June 16, 1/4p.GlobalNews item - IDE
DM201507-0691
2015
Diamonds.netDiamonds provide ample funding to warlords in CAR.Diamonds.net, June 18, 1/4p.Africa, Central African RepublicNews item - legal
DM201507-0692
2015
Diamonds.netDe Beers June sight estimated at $ 550 million.Diamonds.net, June 18, 1/4p.GlobalNews item - De Beers
DM201507-0693
2015
Diamonds.netShore Gold completes drilling program at Star-Orion South.Diamonds.net, June 17, 1/4p.Canada, SaskatchewanNews item - Shore
DM201507-0694
2015
Diamonds.netZimbabwe turns to Botswana for better managing diamonds.Diamonds.net, June 19, 1/4p.Africa, Zimbabwe, BotswanaNews item - legal
DM201507-0695
2015
Diamonds.netParagon preps share buyback, seeks immediate Mothae acquisition.Diamonds.net, June 19, 1/4p.Africa, LesothoNews item - Paragon
DM201507-0696
2015
Diamonds.netDemand grows for industrial and synthetic diamonds.Diamonds.net, June 19, 1/4p.TechnologyNews item - industrial diamonds
DM201507-0697
2015
Diamonds.netDiamond trade subject to arbitration on color grading standards. Policy sets guidelines to tolerance levels on grading.Diamonds.net, June 21, 1/4p.TechnologyNews item - grading
DM201507-0698
2015
Diamonds.netNamibia reviews terms of venture with De Beers.Diamonds.net, June 22, 1/4p.Africa, NamibiaNews item - De Beers
DM201507-0699
2015
Diamonds.netKennedy Diamonds reports sample grade from Kelvin winter drill program.Diamonds.net, June 22, 1/4p.Canada, Northwest TerritoriesNews item - Kennady
DM201507-0700
2015
Diamonds.netLondon Bourse members gain access to bonded warehouse.Diamonds.net, June 24, 1/4p.Europe, EnglandNews item - bourse
DM201507-0701
2015
Diamonds.netOGI releases Titanium 5X laser cutting system.Diamonds.net, June 23, 1/4p.TechnologyNews item - OGI
DM201507-0702
2015
Diamonds.netAlrosa repays $ 185 m worth of commercial bonds.Diamonds.net, June 23, 1/4p.RussiaNews item - Alrosa
DM201507-0703
2015
Diamonds.netKP leaders stress consensus and bringing CAR, Venezuela back into compliance.Diamonds.net, June 24, 1/4p.Africa, Central African Republic, South America, VenezuelaNews item - KP
DM201507-0704
2015
Diamonds.netMellier says Namibia's new diamond sales terms are satisfactory.Diamonds.net, June 24, 1/4p.Africa, NamibiaNews item - De Beers
DM201508-0705
2015
Diamonds.netRapaport presents industry insights, Lussier explains 'The Diamond Dream'.Diamonds.net, June 25, 1/4p.GlobalNews item - economics
DM201508-0706
2015
Diamonds.netNamdeb CEO leaves post for government position. Inge Zaamwani-KamwiDiamonds.net, July 1, 1/4p.Africa, NamibiaNews item - Namdeb
DM201508-0707
2015
Diamonds.netKimberley Process presents roadmap for CAR compliance.Diamonds.net, June 30, 1p.Africa, Central African RepublicNews item - KP
DM201508-0708
2015
Diamonds.netParagon Diamonds loss widens, Revenue target for 2015 is $ 36 million.Diamonds.net, June 29, 1/4p.Africa, LesothoNews item - Paragon
DM201508-0709
2015
Diamonds.netLarge size diamond market under pressure. Q&A with Amir Tiroche, owner and CEO of Tiroche Diamonds.Diamonds.net, July 3, 1/4p.GlobalNews item - Tiroche
DM201508-0710
2015
Diamonds.netDiamond storytelling… marketing and "A Diamond is Forever".Diamonds.net, July 3, 2p.GlobalNews item - De Beers
DM201508-0711
2015
Diamonds.netIndia to continue importing rough diamonds for now.Diamonds.net, July 7, 1/4p.IndiaNews item - rough
DM201508-0712
2015
Diamonds.netZimbabwe mulls bid for Kimberley Process chairmanship by 2018.Diamonds.net, July 7, 1/4p.Africa, ZimbabweNews item - KP
DM201508-0713
2015
Diamonds.netScio revenue halves, loss narrows to $ 4 million.Diamonds.net, July 6, 1/4p.TechnologyNews item - Scio
DM201508-0714
2015
Diamonds.netBotswana's Okavango diamond sales fell 23% in 1 HDiamonds.net, July 9, 1/4p.Africa, BotswanaNews item - Okavango
DM201508-0715
2015
Diamonds.netSightholders can defer 25% of De Beers July supply.Diamonds.net, July 9, 1p.GlobalNews item - De Beers
DM201508-0716
2015
Diamonds.netHRD discovers hard-to-detect synthetic rough diamonds: quick take.Diamonds.net, July 13, 1/4p.TechnologyNews item - HRD Lab
DM201508-0717
2015
Diamonds.netDiamond Hallmarketing seeks to make its mark.Diamonds.net, July 17, 2p.GlobalNews item - Hallmarking
DM201508-0718
2015
Diamonds.netPeregrine Diamonds begins summer development program at Chidliak.Diamonds.net, July 21, 1/4p.Canada, Nunavut, Baffin IslandNews item - Peregrine
DM201508-0719
2015
Diamonds.netNamibia to introduce independent rough diamond sales.Diamonds.net, July 21, 1/4p.Africa, NamibiaNews item - De Beers
DM201508-0720
2015
Diamonds.netAlrosa's 1 H rough diamond sales drop 22 %: quick take.Diamonds.net, July 21, 1/4p.RussiaNews item - Alrosa
DM201508-0721
2015
Diamonds.netDiamcor generates sales of $ 455K in 1 Q. Krone-EndoraDiamonds.net, July 20, 1/4p.Africa, South AfricaNews item - Diamcor
DM201508-0722
2015
Diamonds.netVillagers confront EMA Board about diamond mining pollution.Diamonds.net, July 20, 1/4p.Africa, ZimbabweNews item - EMA
DM201508-0723
2015
Diamonds.netSeeking a better diamond future. Comments from Lieberherr Rio Tinto Diamonds.Diamonds.net, July 17, 1p.GlobalNews item - Rio Tinto
DM201508-0724
2015
Diamonds.netNew synthetic detector to be shown at HK September show: Quick Take Diamonds.net, July 22, 1/4p.TechnologyNews item - Diamond Services
DM201508-0725
2015
Diamonds.netSurat diamond bourse project put on hold.Diamonds.net, July 22, 1/4p.IndiaNews item - Surat
DM201508-0726
2015
Diamonds.netMbada's security guards unleash dogs on illegal panners.Diamonds.net, July 24, 1/4p.Africa, ZimbabweNews item - Mbada
DM201508-0727
2015
Diamonds.netThe futility of chasing rough shadows.Diamonds.net, July 24, 1/4p.GlobalNews item - De Beers
DM201508-0728
2015
Diamonds.netAlrosa has shifted operations at the iconic Udachnay mine…. Opened in June 1955 ..Alrosa's Largest open pit 1,600 X 2,000 m and depth 640 m. 350 million tons of ore containing $ 80 Billion worth mined diamonds.Diamonds.net, July 27, 1/4p.Russia, YakutiaNews item - Alrosa
DM201509-0729
2015
Diamonds.netUnique volcano diamonds found in Russian Far East. TolbachikDiamonds.net, July 27, 1/4p.Russia, KamchatkaNews item - Tolbachik
DM201509-0730
2015
Diamonds.netGem Diamonds 1 H revenue falls 28%.Diamonds.net, July 30, 1/4p.Africa, Lesotho, BotswanaNews item - Gem Diamonds
DM201509-0731
2015
Diamonds.netFipke joins Dunnedin Ventures as company advisor. KahunaDiamonds.net, July 30, 1/4p.Canada, NunavutNews item - Dunnedin
DM201509-0732
2015
Diamonds.netGokhran's rough auction achieves $ 479 per carat.Diamonds.net, July 30, 1/4p.RussiaNews item - Gokhran
DM201509-0733
2015
Diamonds.netZimbabwe to consolidate Marange miners by end of 2015 ( seven companies)Diamonds.net, July 29, 1/4p.Africa, ZimbabweNews item - Marange
DM201509-0734
2015
Diamonds.netRussia weighs establishing rough diamond exchange.Diamonds.net, July 29, 1/4p.RussiaNews item - bourse
DM201509-0735
2015
Diamonds.netLucapa raises $ 3 million for Lulo, postpones rough sale.Diamonds.net, July 27, 1/4p.Africa, AngolaNews item - Lucapa
DM201509-0736
2015
Diamonds.netKao mine large diamond tender begins in New York.Diamonds.net, Aug. 3, 1/4p.Africa, LesothoNews item - Namakwa, Storm Mountain, Fusion, I Hennig
DM201509-0737
2015
Diamonds.netGem International Resources seeks stake in Angola's Dala diamond concession.Diamonds.net, Aug. 3, 1/4p.Africa, AngolaNews item - Gem Diamonds
DM201509-0738
2015
Diamonds.netState Diamond Trader seeks partners for growth.Diamonds.net, July 31, 1/4p.Africa, South AfricaNews item - State Diamond Trader
DM201509-0739
2015
Diamonds.netEllendale mine worker accuses Kimberley Diamonds of unsafe practices.Diamonds.net, Aug. 5, 1/4p.AustraliaNews item - Kimberley Diamonds
DM201509-0740
2015
Diamonds.netRio Tinto diamond revenue -23% to $ 331 million in H1.Diamonds.net, Aug. 6, 1/4p.GlobalNews item - Rio Tinto
DM201509-0741
2015
Diamonds.netLucara cuts production outlook as 2Q revenue, profit plummet. KaroweDiamonds.net, Aug. 13, 1/4p.Africa, BotswanaNews item - Lucara
DM201509-0742
2015
Diamonds.netBotswana diamond producers cut 1,000 jobs in past year. MmegiDiamonds.net, Aug, 13, 1/4p.Africa, BotswanaNews item - cutters
DM201509-0743
2015
Diamonds.netWeak diamond sales may fuel Botswana budget deficit.Diamonds.net, Aug. 18, 1/4p.Africa, BotswanaNews item - sales
DM201509-0744
2015
Diamonds.netLucara finds 336 carat diamond at Botswana mine. KaroweDiamonds.net, Aug. 18, 1/4p.Africa, BotswanaNews item - Lucara
DM201509-0745
2015
Diamonds.netNamibia diamond venture pays % 4.6 m dividend to state. NDTCDiamonds.net, Aug. 19, 1/4p.Africa, NamibiaNews item - NDTC
DM201509-0746
2015
Diamonds.netIs diamond demand determined in Beijing and Washington?Diamonds.net, Aug. 20, 1/4p.United States, ChinaNews item - demand
DM201509-0747
2015
Diamonds.netRussia outshines Botswana as world's top diamond producer in 2014.Diamonds.net, Aug. 25, 1/4p.RussiaNews item - Alrosa
DM201509-0748
2015
Diamonds.netStellar says Tongo to produce 1 million carats over 18 years.Diamonds.net, Aug. 24, 1/4p.Africa, Sierra LeoneNews item - Stellar
DM201509-0749
2015
Diamonds.netDe Beers price cuts could top 10% at sight.Diamonds.net, Aug. 25, 1/4p.GlobalNews item - De Beers
DM201509-0750
2015
Diamonds.netBlue diamonds drive color index higher in 2Q. Fancy Color diamond index ( FCDI tm)Diamonds.net, Aug. 25, 1/4p.GlobalNews item - Blue diamonds
DM201509-0751
2015
Diamonds.netSightholders react to price cuts at $250M sight…. Mixed reactions.Diamonds.net, Aug. 27, 1/4p.GlobalNews item - De Beers
DM201509-0752
2015
Diamonds.netDe Beers maintains outlook for season amid market turmoil.Diamonds.net, Aug. 26, 1/4p.GlobalNews item - De Beers
DM201510-2016
2015
Diamonds.netGIA plans 2016 for opening for synthetic research centre.Diamonds.net, Sept. 1, 1/4p.United States, New JerseyNews item - GIA
DM201510-2017
2015
Diamonds.netAlrosa 1 Q sales up 20% $875.8 million.Diamonds.net, Aug. 30, 1/4p.RussiaNews item - Alrosa
DM201510-2018
2015
Diamonds.netAlrosa unit diamonds go missing at Gokhran.Diamonds.net, Aug. 30, 1/4p.RussiaNews item - Alrosa
DM201510-2019
2015
Diamonds.netAlrosa may cut diamond prices again as orders fall short.Diamonds.net, Sept. 2, 1/4p.RussiaNews item - Alrosa
DM201510-2020
2015
Diamonds.netLucapa recovers 10 ct plus diamonds from Angola's Lulo site.Diamonds.net, Sept. 3, 1/4p.Africa, AngolaNews item - Lucapa
DM201510-2021
2015
Diamonds.netMwana Africa to raise $ 5.6 million for Klipspringer mine work.Diamonds.net, Sept. 3, 1/4p.Africa, South AfricaNews item - Mwana
DM201510-2022
2015
Diamonds.netNew sightholder KGK opens Botswana factory.Diamonds.net, Sept. 3, 1/4p.Africa, BotswanaNews item - KGK
DM201510-2023
2015
Diamonds.netZimbabwe urged to curb rough diamond exports.Diamonds.net, Sept. 6, 1/4p.Africa, ZimbabweNews item - exports
DM201510-2024
2015
Diamonds.netRussia looks to Shanghai experience for Vladivostok diamond exchange.Diamonds.net, Sept. 6, 1/4p.RussiaNews item - Vladivostok
DM201510-2025
2015
Diamonds.netLucara sets November exceptional stone tender. KaroweDiamonds.net, Sept. 8, 1/4p.Africa, BotswanaNews item - Lucara
DM201510-2026
2015
Diamonds.netIsrael diamond industry readies for anti-money laundering law.Diamonds.net, Sept. 9, 1/4p.Europe, IsraelNews item - legal
DM201510-2027
2015
Diamonds.netDiamond prices pressured by financial market slump.Diamonds.net, Sept. 9, 1/4p.GlobalNews item - prices, supply, demand
DM201510-2028
2015
Diamonds.netCatoca mine diamond sales rise 1% in 2014.Diamonds.net, Sept. 9, 1/4p.Africa, AngolaNews item - Endiama
DM201510-2029
2015
Diamonds.netKimberley process: where is it now? Diamonds.net, Sept. 9, 2p.GlobalNews item - KP
DM201510-2030
2015
Diamonds.netEx-Kimberley Diamonds boss arrested over yellow diamond price reports. Alexander AlexanderDiamonds.net, Sept. 16, 1/4p.AustraliaNews item - Kimberley Diamonds
DM201510-2031
2015
Diamonds.netDe Beers growth highlights India as counter to flat growth.Diamonds.net, Sept. 21, 1/4p.IndiaNews item - De Beers
DM201510-2032
2015
Diamonds.netBotswana and Alrosa start Orapa license work.Diamonds.net, Sept. 21, 1/4p.Africa, BotswanaNew item - Botswana Diamonds, Alrosa
DM201510-2033
2015
Diamonds.netRussia's H1 rough diamond exports slide 16%.Diamonds.net, Sept. 20, 1/4p.RussiaNews item - Alrosa
DM201511-2124
2015
Diamonds.netRio Tinto sets first time India rough auction.Diamonds.net, Sept. 29, 1/4p.IndiaNews item - Rio Tinto
DM201511-2125
2015
Diamonds.netLab grown diamonds set to fill deficit as mined output declines.Diamonds.net, Sept. 29, 1/4p.GlobalNews item - synthetics
DM201511-2126
2015
Diamonds.netFancy vivid pink diamond to list at Christies for $ 23-28 million. 16.08 ctsDiamonds.net, Sept. 29, 1/4p.GlobalNews item - diamond notable
DM201511-2127
2015
Diamonds.netIndia preparing measures to raise direct purchases of Russian rough.Diamonds.net, Sept. 29, 1/4p.Russia, IndiaNews item - rough
DM201511-2128
2015
Diamonds.netIndian diamond consumers need differentiated strategy: De Beers.Diamonds.net, Sept. 29, 1/4p.IndiaNews item - De Beers
DM201511-2129
2015
Diamonds.netBotswana first half rough exports - 15%Diamonds.net, Oct. 1, 1/4p.Africa, BotswanaNews item - Debswana
DM201511-2130
2015
Diamonds.netAlrosa unearths 103 carat diamond at Jubilee pipe.Diamonds.net, Oct. 12, 1/4p.RussiaNews item - Alrosa
DM201511-2131
2015
Diamonds.netDe Beers October rough sales reflect depressed market.Diamonds.net, Oct. 14, 1/4p.GlobalNews item - De Beers
DM201511-2132
2015
Diamonds.netDiamond Corp delays sales due to slow mining progress. LaceDiamonds.net, Oct. 15, 1/4p.Africa, South AfricaNews item - DiamondCorp
DM201511-2133
2015
Diamonds.netSynthetic diamonds: legitimize, don't ostracize.Diamonds.net, Oct. 15, 2p.TechnologyNews item - synthetics
DM201511-2134
2015
Diamonds.netEllendale may be handed back to the local government.Diamonds.net, Oct. 22, 1/4p.AustraliaNews item - Ellendale
DM201511-2135
2015
Diamonds.netSignet inks rough supply deal with Alrosa. A list of Alrosa's clients included.Diamonds.net, Oct. 21, 2p.RussiaNews item - Alrosa
DM201511-2136
2015
Diamonds.netE-commerce startup Worthy raises $ 8 million for diamond, colored gems expansion.Diamonds.net, Oct. 25, 1/2p.GlobalNews item - Worthy
DM201511-2137
2015
Diamonds.netGIA invalidates 1,000 plus grading reports after hackers alter data.Diamonds.net, Oct. 24, 1/2p.GlobalNews item - GIA
DM201511-2138
2015
Diamonds.netDe Beers enables 100% deferrals at November sight.Diamonds.net, Oct. 26, 1/4p.GlobalNews item - De Beers
DM201512-2221
2015
Diamonds.netSouth Africa told its lagging diamond industry needs a boost.Diamonds.net, Oct. 29, 1/4p.Africa, South AfricaNews item - economics
DM201512-2222
2015
Diamonds.netBotswana 3 Q rough exports -41%.Diamonds.net, Nov. 3, 1/4p.Africa, BotswanaNews item - exports
DM201512-2223
2015
Diamonds.netArgyle pink tender results come in as Leibish wins 26 stones.Diamonds.net, Nov. 3, 1/4p.AustraliaNews item - Argyle
DM201512-2224
2015
Diamonds.netSarine Technologies swings to loss in 3Q as revenue plummets 53%.Diamonds.net, Nov. 9, 1/4p.TechnologyNews item - Sarine
DM201512-2225
2015
Diamonds.netDe Beers November sight slumps to estimated $ 70 million.Diamonds.net, Nov. 11, 2p.GlobalNews item - De Beers
DM201512-2226
2015
Diamonds.netRio Tinto says Karelian's FIn land find is diamond making material.Diamonds.net, Nov. 11, 1/4p.Europe, FinlandNews item - Karelian
DM201512-2227
2015
Diamonds.netMurowa mine working to boost production after Rio Tinto exit.Diamonds.net, Nov. 11, 1/4p.Africa, ZimbabweNews item - Murowa Diamonds
DM201512-2228
2015
Diamonds.netUK's Paragon Diamond shares, listed on UK alternative has had its shares temporarily suspended amid financial 'uncertainty'.Diamonds.net, Nov. 17, 1/4p.Africa, LesothoNews item - Paragon
DM201512-2229
2015
Diamonds.netLab-grown diamond producer Scio's 2Q revenue doubles, net loss widens 8%.Diamonds.net, Nov. 17, 1/4p.TechnologyNews item - Scio
DM201512-2230
2015
Diamonds.netRio Tinto carries out first shipment of rough diamonds to BDB's special notified zone. BharatDiamonds.net, Nov. 16, 1/4p.IndiaNews item - Rio Tinto
DM201512-2231
2015
Diamonds.netIndia's GJEPC plans advertising push with global miners to revive diamond trade.Diamonds.net, Nov. 17, 1/4p.IndiaNews item - GJEPC
DM201512-2232
2015
Diamonds.netHistoric diamonds put Lucara in enviable spotlight. Second and Sixth largest diamonds in history.Diamonds.net, Nov. 19, 3p.Africa, BotswanaNews item - Lucara
DM201512-2233
2015
Diamonds.netAlrosa revises sales budget, keeps production plan unchanged.Diamonds.net, Nov. 23, 1/4p.RussiaNews item - Alrosa
DM201512-2234
2015
Diamonds.netDe Beers shareholders to meet on diamond prices.Diamonds.net, Nov. 23, 1/4p.Africa, BotswanaNews item - De Beers
DM201512-2235
2015
Diamonds.netDominion sales -53% as average price drop at Ekati.Diamonds.net, Nov. 22, 1/4p.Canada, Northwest TerritoriesNews item - Dominion
DM201512-2236
2015
Diamonds.netAustralia's Mustang Resources raises $ 4.1 million to progress Mozambique projects. Save RiverDiamonds.net, Nov. 25, 1/4p.Africa, MozambiqueNews item - Mustang
DM201512-2237
2015
Diamonds.netTiffany's 3Q revenue -2% as strong dollar mutes sales.Diamonds.net, Nov. 24, 1p.GlobalNews item - Tiffany
DM201512-2238
2015
Diamonds.netRapaport calls for resignation of De Beers CEO. Diamonds.net, Nov. 24, 1/2p.GlobalNews item - De Beers
DM201512-2239
2015
Diamonds.netHow Botswana will find independence. 50 yearsDiamonds.net, Nov. 26, 1/4p.Africa, BotswanaNews item - history
DM201512-2240
2015
Diamonds.netMajority of diamonds in GIA hacking case still not returned, 175 of 1,042 only so far.Diamonds.net, Nov. 26, 1/4p.TechnologyNews item - GIA
DM201512-2241
2015
Diamonds.netParagon's nominated advisor quits as London shares remain suspended.Diamonds.net, Nov. 26, 1/4p.Africa, LesothoNews item - Paragon
DM201512-2242
2015
Diamonds.netZimbabwe government urged to float consolidated diamond company.Diamonds.net, Nov. 26, 1/4p.Africa, ZimbabweNews item - legal
DM201502-0540
2014
DIB OnlineTrust is a two way street…. Israel's diamond industry works to fortify local polishing sector. Diamond Intelligence Brief, No. 844, Dec. 31, 1p.IndiaNews item - polishing
DM201505-0754
2015
DIB OnlineModular tailings plant planned for Debswana's Letlhakane mine site.diamondintelligence.com, 1/2p.Africa, BotswanaNews item - Debswana
DM201507-0541
2015
DIB OnlineKPCS intercessional: Zimbabwe on the agenda again. Diamondintelligence.com, June 24, 1/4p.Africa, ZimbabweNews item - KP
DM201507-0542
2015
DIB OnlineKennady's Kelvin produces excellent results - sample grade 2.74 ctDiamondintelligence.com, June 24, 1/4p.Canada, Northwest TerritoriesNews item - Kennady
DM201507-0543
2015
DIB OnlineSunland Minerals' Botswana exploration promising.Diamondintelligence.com, June 18, 1/4p.Africa, BotswanaNews item - Botswana Diamonds, Alrosa
DM201508-0755
2015
DIB OnlineDe Beers mining production down 6% in Q2DIB Online, July 16, 1p.GlobalNews item - De Beers
DM201508-0756
2015
DIB OnlineNamibia's Trustco may acquire diamond mine and polishing factory in Namibia. Kunene Huso and NNDCDIB Online, July 13, 1/2p.Africa, NamibiaNews item - Trustco
DM201508-0757
2015
DIB OnlineTalks stalled between Dominion and Canada's Union of Northern Workers. DIB Online, July 13, 1/2p.Canada, Northwest TerritoriesNews item - Dominion
DM201509-0753
2015
DIB OnlineSierra Leoneons face depletion of existing alluvial deposits. DIB Online, Aug. 11, 1/4p.Africa, Sierra LeoneNews item - alluvials
DM201509-0758
2015
DIB OnlineDominion fiscal Q2 2016 results: diamond sales $ 209.7 million. Ekati and DiavikDIBOnline.com, Aug. 23, 1/4p.Canada, Northwest TerritoriesNews item - Dominion
DM201509-0759
2015
DIB OnlineLarge diamond possibly worth over $ 7 million 'missing' from India's Panna district. ( shallow open pits)DIBOnline.com, No. 861, Aug. 24, 1/4p.IndiaNews item - legal
DS201512-1914
2015
Dickson, J.S.Rare earth elements: global market overview.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov 13-14 2015, pp. 5-12.GlobalRare earths

Abstract: Rare earth elements (REE), as defi ned by the International Union of Pure and Applied Chemistry (IUPAC), include yttrium (Y), scandium (Sc), and the lanthanides, comprising lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), and lutetium (Lu). In the scientifi c community, subdivisions into light (LREE) and heavy (HREE) categories are based on electron confi guration. In this context, LREE include La, Ce, Pr, Nd, Pm, Sm, Eu, and Gd and HREE include Y, Tb, Dy, Ho, Er, Tm, Yb, and Lu (Connelly et al., 2005). Industry commonly refers to LREE as lanthanides from La to Sm, and HREE as lanthanides from Eu to Lu, plus Y (Simandl, 2014). World mine production of rare earth oxides (REO) for 2014 is estimated at approximately 117,000 tonnes, including Y2O3, which accounts for 7000 tonnes of the total (Gambogi, 2015a, b). In 2014, the main producing countries for REE less Y were China, with 86% of worldwide production (Gambogi, 2015a), the United States, India, Australia, Russia, and Thailand (Fig. 1).
DS201502-0054
2015
Dobretsov, N.L., Koulakov, I.Yu., Litasov, K.D., Kukarina, E.V.An integrated model of subduction: contributions from geology, experimental petrology and seismic tomography.Russian Geology and Geophysics, Vol. 56, 1-2, pp. 13-38.MantleSubduction
DS201509-0394
2015
Dobretsov, N.L., Turkina, O.M.Early Precambrian Earth history: plate and plume tectonics and extraterrestrial controls.Russian Geology and Geophysics, Vol. 56, pp. 978-995.MantleSubduction

Abstract: The Hadean and Archean geologic history of the Earth is discussed in the context of available knowledge from different sources: space physics and comparative planetology; isotope geochronology; geology and petrology of Archean greenstone belts (GB) and tonalite-trondhjemite-granodiorite (TTG) complexes; and geodynamic modeling review to analyse plate-tectonic, plume activity, and impact processes. Correlation between the age peaks of terrestrial Hadean-Early Archean zircons and late heavy bombardment events on the Moon, as well as the Hf isotope composition of zircons indicating their mostly mafic sources, hint to an important role of impact processes in the Earth’s history between 4.4 and 3.8 Ga. The earliest continental crust (TTG complexes) formed at 4.2 Ga (Acasta gneisses), while its large-scale recycling left imprint in Hf isotope signatures after 3.75 Ga. The associations and geochemistry of rocks suggest that Archean greenstone belts formed in settings of rifting, ocean floor spreading, subduction, and plume magmatism generally similar to the present respective processes. The Archean history differed in the greater extent of rocks derived from mantle plumes (komatiites and basalts), boninites, and adakites as well as in shorter subduction cycles recorded in alternation of typical calc-alkaline andesite-dacite-rhyolite and adakite series that were generated in a hotter mantle with more turbulent convection and unsteady subduction. The Archean is interpreted as a transient period of small plate tectonics.
DS201507-0309
2015
Dobretsov, N.L., Zedgenizov, D.A., Litasov, K.D.Evidence for and consequences of the "hot" subduction model.Doklady Earth Sciences, Vol. 461, 1, pp. 517-521.MantleSubduction
DS201511-1832
2015
Doglioni, C., Anderson, D.L.Top-driven asymmetric mantle convection.Geological Society of America Special Paper, No. 514, pp. SPE514-05.MantleConvection

Abstract: The role of decoupling in the low-velocity zone is crucial for understanding plate tectonics and mantle convection. Mantle convection models fail to integrate plate kinematics and thermodynamics of the mantle. In a first gross estimate, we computed at >300 km3/yr the volume of the plates lost along subduction zones. Mass balance predicts that slabs are compensated by broad passive upwellings beneath oceans and continents, passively emerging at oceanic ridges and backarc basins. These may correspond to the broad low-wavespeed regions found in the upper mantle by tomography. However, west-directed slabs enter the mantle more than three times faster (?232 km3/yr) than in the opposite east- or northeast-directed subduction zones (?74 km3/yr). This difference is consistent with the westward drift of the outer shell relative to the underlying mantle, which accounts for the steep dip of west-directed slabs, the asymmetry between flanks of oceanic ridges, and the directions of ridge migration. The larger recycling volumes along west-directed subduction zones imply asymmetric cooling of the underlying mantle and that there is an "easterly" directed component of the upwelling replacement mantle. In this model, mantle convection is tuned by polarized decoupling of the advecting and shearing upper boundary layer. Return mantle flow can result from passive volume balance rather than only by thermal buoyancy-driven upwelling.
DC201501-1457
2014
Dolat Ventures Inc.Dolat Ventures Inc. completes corporate restructuring…and Millenium Mining LLC ( subsidiary) has signed a JV to restart diamond mining near Bo, Sierra Leone. Sewa RiverDolat Ventures Inc., Dec. 1, 1p.Africa, Sierra LeoneNews item - press release
DC201501-1458
2014
Dolat Ventures Inc.Moves forward with private investment into diamond mine assets. To restart mining at Bo, Sierra Leone.Dolat Ventures Inc., Dec. 9, 1p.Africa, Sierra LeoneNews item - press release
DC201501-1459
2014
Dolat Ventures Inc.Dolat ventures to reduce outstanding stock.Dolat Ventures Inc., Dec. 12, 1p.Africa, Sierra LeoneNews item - press release
DC201503-1460
2015
Dominion Diamond CorporationDominion Diamond Corporation announces Jay project pre-feasibility study results. 84.6 million carats promoted to mineral reserve… NPV of $ 610 mililon.Dominion Diamond Corporation, Jan. 28, 3p.Canada, Northwest TerritoriesNews item - press release
DC201503-1461
2015
Dominion Diamond CorporationDominon Diamond reports fiscal 2015 fourth quarter and year end sales and production results.Dominion Diamond Corporation, Feb. 23, 5p.Canada, Northwest TerritoriesNews item - press release
DC201504-1462
2015
Dominion Diamond CorporationDominion Diamond Corporation issues updated reserves amd resources statement for the Diavik diamond mine. Dominion Diamond Corporation, Mar. 6, 5p.Canada, Northwest TerritoriesNews item - press release
DC201504-1463
2015
Dominion Diamond CorporationDominion files technical report for the Ekati diamond mine.Dominion Diamond Corporation, Mar. 12, 14p.Canada, Northwest TerritoriesNews item - press release
DC201505-1464
2015
Dominion Diamond CorporationDominion Diamond Corporation files technical report for the Diavik diamond mines.Dominion Diamond Corporation , Mar. 26, 2p.Canada, Northwest TerritoriesNews item - press release
DC201505-1465
2015
Dominion Diamond CorporationDominion Diamond Corporation reports continued strong operating results supporting dividend declaration.Dominion Diamond Corporation , Apr. 8, 4p.Canada, Northwest TerritoriesNews item - press release
DC201505-1466
2015
Dominion Diamond CorporationDominion Diamond Corporation files annual report on Form 40-F with SEC.Dominion Diamond Corporation , Apr. 20, 2p..Canada, Northwest TerritoriesNews item - press release
DC201505-1467
2015
Dominion Diamond CorporationDominion reports Diavik diamond mine first calendar quarter production. Dominion Diamond Corporation , Apr. 21, 5p.Canada, Northwest TerritoriesNews item - press release
DC201506-1468
2015
Dominion Diamond CorporationDominion Diamond Corporation reports fiscal 2016 first quarter sales and production results.Dominion Diamond Corporation, May 21, 5p.Canada, Northwest TerritoriesNews item - press release
DC201507-1469
2015
Dominion Diamond CorporationDominion Diamond Corporation's fiscal 2016 first quarter results to be released Wednesday June 10, 2015.Dominion Diamond Corporation, June 10, 3p.Canada, Northwest TerritoriesNews item - press release
DC201508-1470
2015
Dominion Diamond CorporationDominion Diamond Corporation announces Chairman Robert A. Gannicott to resume duties and Brendan Bell appointed CEO.Dominion Diamond Corporation, July 13, 1p.Canada, Northwest TerritoriesNews item - press release
DC201508-1471
2015
Dominion Diamond CorporationDominion Diamond Corporation reports Diavik diamond mine second calendar quarter production.Dominion Diamond Corporation, July 15, 2p.Canada, Northwest TerritoriesNews item - press release
DC201509-1472
2015
Dominion Diamond CorporationDominion Diamond Corporation fiscal 2016 second quarter sales and production results.Dominion Diamond Corporation, Aug. 20, 5p.Canada, Northwest TerritoriesNews item - press release
DC201510-2344
2015
Dominion Diamond CorporationDominion Diamond Corporation reports fiscal 2016 second quarter results.Dominion Diamond Corporation, Sept. 10, 5p.Canada, Northwest TerritoriesNews item - press release
DC201510-2345
2015
Dominion Diamond CorporationDominion Diamond Corporation announces Sable project preliminary economic assessment results. 11.7 m carats operational synergies with Jay project.Dominion Diamond Corporation, Sept. 10, 2p.Canada, Northwest TerritoriesNews item - press release
DC201511-2378
2015
Dominion Diamond CorporationDominion Diamond Corporation reports Diavik diamond mine third calendar quarter production.Dominion Diamond Corporation, Oct. 15, 7p.Canada, Northwest TerritoriesNews item - press release
DC201512-2430
2015
Dominion Diamond CorporationDominion Diamond reports fiscal 2016 third quarter sales and production results.Dominion Diamond Corporation, Nov. 20, 5p.Canada, Northwest TerritoriesNews item - press release
DS201508-0350
2015
Dongre, A.N., Jacob, D.E., Stern, R.A.Subduction related origin of eclogite xenoliths from the Wajrakarur kimberlite field, Eastern Dharwar craton, southern India: constraints from petrology and geochemistry.Geochimica et Cosmochimica Acta, Vol. 166, pp. 165-188.IndiaDeposit - Wajrakarur
DS201508-0351
2015
Dongre, A.N., Viljoen, K.S., Ma, M.The Pipe-15 kimberlite: a new addition to the Wajrakarur cluster of the Wajrakarur kimberlite field, Eastern Dharwar craton, southern India.Journal of the Geological Society of India, Vol. 86, 1, pp. 71-79.IndiaDeposit - Pipe-15
DS201502-0055
2015
Dorogokupets, P.I., Dymshits, A.M., Sokolova, T.S., Danilov, B.S., Litasov, K.D.The equations of state of forsterite, wadsleyite, ringwoodite, akimotoite, Mg2SiO4 perovskite and post perovskite and phase diagram for the Mg2SiO4 system at pressures of up to 130 Gpa.Russian Geology and Geophysics, Vol. 56, 1-2, pp. 172-189.TechnologyPerovskite
DS201511-1833
2014
Downes, P.J., Bevan, A.W.R., Deacon, G.L.The Kimberley Diamond Company Ellendale diamond collection at the Western Australia Museum.Australian Gemmologist, Vol. 24, 12, pp. 289-293.AustraliaDeposit - Ellendale
DC201502-1474
2015
Dunnedin Ventures Inc.TSX venture exchange approves Kahuna option agreement.Dunnedin Ventures Inc., Jan. 5, 1p.Canada, NunavutNews item - press release
DC201503-1473
2015
Dunnedin Ventures Inc.Dunnedin reports 4.02 carat inferred diamond resource at Khuna.Dunnedin Ventures Inc., Jan. 26, 3p.Canada, NunavutNews item - press release
DC201504-1475
2015
Dunnedin Ventures Inc.Dunnedin increases land position to control additional kimberlites. KahunaDunnedin Ventures Inc., Mar. 2, 1p.Canada, NunavutNews item - press release
DC201505-1476
2015
Dunnedin Ventures Inc.Dunnedin files maiden resource report including additional target for further exploration. Kahuna and NotchDunnedin Ventures Inc., Mar. 31, 1p.Canada, NunavutNews item - press release
DC201506-1477
2015
Dunnedin Ventures Inc.Dunnedin receives land use permits and adds diamond project development expertise. KahunaDunnedin Ventures Inc., May 7, 1p.Canada, NunavutNews item - press release
DC201508-1478
2015
Dunnedin Ventures Inc.Dunnedin announces July mobiliazation and expands scope of project. KahunaDunnedin Ventures Inc., June 29, 2p.Canada, Nunavut, Rankin InletNews item - press release
DC201510-2346
2015
Dunnedin Ventures Inc.Dunnedin provides update on summer diamond exploration and announces non-brokered private placement.Dunnedin Ventures Inc., Aug. 31, 1p.Canada, NunavutNews item - press release
DC201511-2379
2015
Dunnedin Ventures Inc.Dunnedin provides update on kimberlite sample processing. Kahuna and Notch.Dunnedin Ventures Inc., Oct. 8, 1p.Canada, NunavutNews item - press release
DC201512-2431
2015
Dunnedin Ventures Inc.Dunnedin reports 5.34 carats from first 0.82 tonne kimberlite sample.Dunnedin Ventures Inc., Nov. 12, 1p.Canada, QuebecNews item - press release
DC201505-1479
2015
Durango Resources Inc.Durango signs non binding LOI for diamonds in James Bay.Durango Resources Inc., Mar. 24, 1p.Canada, Quebec, Otish MountainsNews item - press release
DC201505-1480
2015
Durango Resources Inc.Durango to focus on gold in the James Bay region. Not to continue LOI for the Lucky 7 diamond property.Durango Resources Inc., Apr. 1, 1p.Canada, QuebecNews item - press release
DS201504-0193
2014
Dvoichenkova, G.P.Mineral formations on natural diamond surface and their destruction using electrochemically modified mineralized water.Journal of Mining Science, Vol. 50, 4, pp. 788-799.TechnologyDiamond morphology - surfaces
DS201510-1765
2014
Dvoichenkova, G.P.Mineral formations on natural diamond surface and their destruction using electrochemically modified mineralized water.Journal of Mining Science, Vol. 50, 4, pp. 788-799.TechnologyDiamond morphology

Abstract: The article describes modeling and analysis of formation, attachment and dissolving of mineral substances on surface of diamond crystals. Based on the thermodynamic analysis and experimental research, the author validates deposition of chemical compounds as the main factor to govern mineral formations on natural diamond surface under contact with mineralized water in the occurrence conditions of kimberlite ore and during mining and processing. The efficiency of electrochemically modified water in dissolving and removal of mineral formations from diamond surface is ascertained.
DS201504-0194
2015
Dymshits, A., Sharygin, I., Litasov, K., Shatskiy, A., Gavryushkin, P., Ohtani, E., Suzuki, A., Funakoshi, K.In situ observation of the pyroxene majorite transition in Na2MgSi5O12 using synchroton radiation and Raman spectroscopy of Na-majorite.American Mineralogist, Vol. 100, pp. 378-384.MantleMajorite
DS201508-0352
2015
Eaton-Magana, S.Comparison of luminescence life times from natural and laboratory irradiated diamonds.Diamond and Related Materials, Vol 58, pp. 94-102.TechnologyDiamond - luminescence
DS201510-1766
2015
Eaton-Magana, S., Ardon, T.Effect of LPHT treatment on natural Type 1A diamonds.GSA Annual Meeting, Paper 300-10, 1p. Abstract only BoothTechnologyLPHT
DS201512-1915
2015
Ebert, K., Brodaric, B.GIS analyses of ice-sheet erosional impacts on the exposed shield of Baffin Island, eastern Canadian Arctic.Canadian Journal of Earth Sciences, Vol. 52, 11, pp. 966-979.Canada, Nunavut, Baffin IslandGeomorphology

Abstract: The erosional impacts of former ice sheets on the low-relief bedrock surfaces of Northern Hemisphere shields are not well understood. This paper assesses the variable impacts of glacial erosion on a portion of Baffin Island, eastern Canadian Arctic, between 68° and 72°N and 66° and 80°W. This tilted shield block was covered repeatedly by the Laurentide Ice Sheet during the late Cenozoic. The impact of ice-sheet erosion is examined with GIS analyses using two geomorphic parameters: lake density and terrain ruggedness. The resulting patterns generally conform to published data from other remote sensing studies, geological observations, cosmogenic exposure ages, and the distribution of the chemical index of alteration for tills. Lake density and terrain ruggedness are thereby demonstrated to be useful quantitative indicators of variable ice-sheet erosional impacts across Baffin Island. Ice-sheet erosion was most effective in the lower western parts of the lowlands, in a west-east-oriented band at around 350-400 m a.s.l., and in fjord-onset zones in the uplifted eastern region. Above the 350-400 m a.s.l. band and between the fjord-onset zones, ice-sheet erosion was not sufficient to create extensive ice-roughened or streamlined bedrock surfaces. The exception — where lake density and terrain ruggedness indicate that ice-sheet erosion had a scouring effect all across the study area — was in an area from Foxe Basin to Home Bay with elevations <400 m a.s.l. These morphological contrasts link to former ice-sheet basal thermal regimes during the Pleistocene. The zone of low glacial erosion surrounding the cold-based Barnes Ice Cap probably represents the ice cap’s greater extent during successive Pleistocene cold stages. Inter-fjord plateaus with few ice-sheet bedforms remained cold-based throughout multiple Pleistocene glaciations. In contrast, zones of high lake density and high terrain ruggedness are a result of the repeated development of fast-flowing, erosive ice in warm-based zones beneath the Laurentide Ice Sheet. These zones are linked to greater ice thickness over western lowland Baffin Island. However, adjacent lowland surfaces with similar elevations of non-eroded, weakly eroded, and ice-scoured shield bedrock indicate that—even in areas of high lake density and terrain ruggedness—the total depth of ice sheet erosion did not exceed 50 m.
DM201508-0760
2015
Ecclestone, C.Tango Mining .. Strategy Oena .. Coverage by analystHallgarten & Company cecclestone @hallgartenco.com, July 6, 16p.Africa, South AfricaNews item - Tango Mining
DS201507-0310
2015
Edwards, S.J., Schellart, W.P., Duarte, J.C.Geodynamic models of continental subduction and obduction of overriding plate forearc oceanic lithosphere on top of continental crust.Tectonics, Vol. 34, 7, pp. 1494-1515.New ZealandSubduction
DM201508-0761
2015
Ehud Arye LaniadoTackling debts & fears in today's diamond market.ehudlaniado.com, June 29, 8p.GlobalNews item - markets
DM201508-0762
2015
Ehud Arye LaniadoDark Clouds loom over the diamond industry.ehudlaniado.com, July 13, 5p.GlobalNews item - economics
DM201508-0763
2015
Ehud Arye LaniadoAntwerp and diamonds: a rocky love story.EAL, July 15, 4p.EuropeNews item - diamond centers -history
DM201508-0764
2015
Ehud Arye LaniadoMiners vs the Midstream: who needs to change?info @ehudlaniado.com, July 27, 5p.GlobalNews item - value chain
DM201509-0765
2015
Ehud Arye LaniadoIndia where it all began.ehudlaniado.com, July 29, 3p.IndiaNews item - history
DM201509-0766
2015
Ehud Arye LaniadoNot a price correction but a market correction.ehudlaniado.com, Aug. 3, 3p.GlobalNews item - markets
DM201509-0767
2015
Ehud Arye LaniadoNew York diamond center.ehudlaniado.com, Aug. 5, 4p.United StatesNews item - history
DM201509-0768
2015
Ehud Arye LaniadoThe booming bear: the story of Russian diamond industry.ehudlaniado.com, Aug. 13, 5p.RussiaNews item - history
DM201509-0769
2015
Ehud Arye LaniadoIs the midstream working for a wage? A call for more profitable midstream for a stronger industry.ehudlaniado.com, Aug. 17, 5p.GlobalNews item - polishers
DM201509-0770
2015
Ehud Arye LaniadoKey changes offer bright future for diamond industry.info @ehudlaniado.com, Aug. 24, 3p.GlobalNews item - economics
DM201509-0771
2015
Ehud Arye LaniadoDiamond centers - Dubai profiled.ehudlaniado.com, Aug. 26, 4p.DubaiNews item - Dubai
DM201510-2034
2015
Ehud Arye LaniadoA call for change, a call for hope.ehudlaniado.com, Aug. 31, 4p.GlobalNews item - market
DM201510-2035
2015
Ehud Arye LaniadoHong Kong's rise to diamond fame.ehudlaniado.com, 4p.Hong KongNews item - Hong Kong
DM201510-2036
2015
Ehud Arye LaniadoThe awakening of diamonds in Chin a ( jewellery)ehudlaniado.com, Sept. 9, 4p.ChinaNews item - markets
DM201510-2037
2015
Ehud Arye LaniadoStability in the diamond market.ehudlaniado.com, Sept. 21, 5p.GlobalNews item - markets
DM201510-2038
2015
Ehud Arye LaniadoDiamond mining in Namibia - past and present.ehudlaniado.com, Sept. 24, 3p.Africa, NamibiaNews item - history
DM201511-2139
2015
ehud Arye LaniadoThe diamonds's place in the consumer's heart.ehudlaniado.com, Oct. 5, 3p.GlobalNews item - history
DM201511-2140
2015
Ehud Arye LaniadoUnderstanding seasonality in diamond sales.ehudlaniado.com, Oct. 15, 8p.GlobalNews item - markets
DM201512-2243
2015
Ehud Arye Laniado$ 48 .4 million for 'blue Moon' diamond eclipses world auction record.ehudlaniado.com, Nov. 12, 2p.GlobalNews item - diamond notable
DM201512-2244
2015
Ehud Arye LaniadoRetail Economics: why consolidation could be helping the entire diamond retail industry.ehudlaniado.com, Nov. 25, 3p.GlobalNews item - prices
DS201505-0241
2015
Elazar, O., Kessel, R., Navon, O.Fluids and melts in equlibrium with carbonated hydrous eclogite system at 4-6 Gpa and 900-1200 C.Israel Geological Society, Abstracts 1p.TechnologyEclogite
DS201506-0264
2015
El-Desoky, H., Khalil, A.E., Salem, A.K.A.Ultramafic rocks in Gabal El-Rubshi, Central Eastern Desert, Egypt: petrography, mineral chemistry, and geochemistry constraints.Arabian Journal of Geosciences, Vol. 8, 5, pp.2607-2631.Africa, EgyptUltramafic rocks - general
DC201511-2380
2015
Element SixElement Six announced the use of its researchers at MQ Photonics to demonstrate a diamond laser 20 times more powerful than previous ones.Element Six, Sept. 23, 1/2p.TechnologyNews item - Element Six
DC201509-1481
2015
Elkedra Diamonds NL.Canadian master diamond cutter Mike Botha to craft the Esperanza diamond in Arkansas.Embee Diamonds, Aug. 27, 1/2p.United States, ArkansasNews item - Embee
DM201503-0772
2015
EMJ WompRio Tinto developing Diavik's A21 pipe.womp-int.com, Jan. 29, 1/3p.Canada, Northwest TerritoriesNews item - Rio Tinto
DC201508-1482
2015
EMU NLSale of Superkolong diamond interest final payment from El Nino Mining.EMU NL, July 17, 1/8p.AustraliaNews item - press release
DS201512-1916
2015
Evans, K.A., Powell, R.The effect of subduction on sulphur, carbon and redox budget of lithospheric mantle.Journal of Metamorphic Geology, Vol. 33, 6, pp. 649-670.MantleSubduction

Abstract: Subduction of hydrated lithospheric mantle introduces Hinline imageO, ferric iron, oxidized carbon and sulphur to the subduction zone system. The fate of these components is poorly known, but is intimately linked to the global geochemical cycles of iron, carbon and sulphur, the genesis of arc-related ore deposits, the temporal evolution of mantle redox state and subduction-related earthquakes and magmatism. thermocalc is used to provide first-order constraints on the effect of subduction zone metamorphism on metamorphic redistribution of iron, carbon, sulphur and water in ultramafic rocks via construction of P?T and T-X(O) pseudosections with open system calculation of the effect of fluid loss. The calculations replicate observed mineral assemblages in high-P to low-T ultramafic rocks at P?T conditions consistent with those suggested by other workers. The results are consistent with open system fluid loss without significant fluid infiltration. Water loss is complete by 850 inline imageC, the corresponding depth of fluid loss being consistent with that inferred for earthquakes in subducting slabs. Losses of carbon and sulphur are relatively minor, at around <5% and <1%, respectively, so it is envisaged that most carbon and sulphur subducted in ultramafic lithologies is transported to >5 GPa, below the depths of the source zone for arc volcanoes. Oxygen activity for rocks in closed systems that evolve with a fixed redox budget is calculated to change from ?FMQ ?1 at 350 inline imageC to over ?FMQ +3 at 850 inline imageC. This result emphasizes the need to consider redox budget as well as oxygen activity when the results of experiments performed at fixed oxygen activity relative to some buffer are interpreted in the context of natural systems. In open systems, devolatilization is calculated to increase the redox budget and oxygen activity of the residue via loss of methane and Hinline imageS at the brucite-out and serpentine-out reactions respectively. No fluid-induced mechanism for oxidation of sub-arc mantle by transfer of redox budget from hydrated ultramafic lithologies to the overlying sub-arc mantle was identified, although further thermodynamic data on fluid species such as Sinline image are required to confirm this.
DM201510-2108
2015
Evans, N.Bit by bit sale for Ellendale. The West Australian, Sept. 3, 1p.AustraliaNews item - Kimberley Diamonds
DM201512-2245
2015
Evans, N.Diamond Daze - Ellendale Upbeat corporate forecasts, it transpires, were based on no more than an assumption that Tiffany would pay more for yellow diamonds.The Australian News , Nov. pp. 8-10. pdfAustraliaNews item - Kimberley Diamonds
DM201501-0475
2014
Even-Zohar, C.Another certificate movie: Dirty Dancing … using analogy to ethical grading and different labs.Diamond Intelligence Briefs ( Courtesy of Chaim), DIB 839, Nov. 25, pp. 8941-8945.TechnologyNews item - diamond certificates
DM201501-0476
2014
Even-Zohar, C.Analyzing Indian dreams of duty free jewelry exports to the United States.Diamond Intelligence Briefs ( Courtesy of Chaim), DIB 838, Nov. 19, pp. 8927-8930.India, United StatesNews item - GSP program
DM201501-0477
2014
Even-Zohar, C.Tyler Gillard: 'OECD has no plans to issue precious stones ( or diamonds) Due Diligence Guidelines at this time. Discusses The white paper initiative.Diamond Intelligence Briefs ( Courtesy of Chaim), DIB 837, Nov. 12, pp. 8913-17.GlobalNews item - OECD
DM201502-0774
2015
Even-Zohar, C.Analyzing Indian dreams of duty-free jewelry exports to the United States.Idex Magazine, No. 297, Jan. pp. 112-117.IndiaNews item - jewelry
DM201503-0775
2015
Even-Zohar, C.Economics 101: a course on added value.DIB , Vol. 30, 848, Jan. 28, pp. 9038-9042.GlobalNews item - statistics
DM201503-0776
2015
Even-Zohar, C.Diamond miracles from the Holy Land…. Offical diamond import and export statistics ( KP and Israel)…. Observations and concerns.DIB , Vol. 30, 845, Jan. 7, pp. 9008-9010.GlobalNews item - statistics
DM201503-0777
2015
Even-Zohar, C.False ABN-AMRO withdrawal scare in India.DIB , Vol. 30, 846, Jan. 15, pp. 9018-9020.IndiaNews item - banking, financing
DM201503-0778
2015
Even-Zohar, C.Taking one's banker to court. ABN-AMRODIB , Vol. 30, 847, Jan. 22, pp. 9029-9032.IndiaNews item - legal
DM201506-0779
2015
Even-Zohar, C.The year the industry lost confidence in its future.Diamond Intelligence Briefing Courtesy of Chaim), Vol. 30, 855, Apr. 27, 3p.GlobalNews item - supply chain
DM201507-0780
2015
Even-Zohar, C.ABN AMRO's Indian exit: Induslnd bank catapults into $ 1 billion exposure.Diamond Intelligence Briefing ( Courtesy of Chaim), Vol. 30, 854, Apr. 13, 8p.IndiaNews item - Induslnd
DM201507-0781
2015
Even-Zohar, C.Botswana beneficiation from a marketing agreement perspective: local rough supplies - a promise broken.Diamond Intelligence Briefing ( Courtesy of Chaim), Vol. 30, 856, May 11, 8p.Africa, BotswanaNews item - beneficiation
DM201509-0773
2015
Even-Zohar, C.Love and hate on the rough supply side. Diamond Intelligence Briefing, Vol. 30, no. 860, July 23, 8p.GlobalNews item - rough
DM201510-2039
2015
Even-Zohar, C.The emerging secrets of a bank destined to close. Antwerp Diamond Bank ( ADB)Diamond Intelligence Briefing ( Courtesy of Chaim), Vol. 30, no. 862, Sept. 11, 11p.Europe, BelgiumNews item - ADB legal
DM201511-2209
2015
Even-Zohar, C.Beneficiation from a marketing agreement perspective… factories, management and history.Idex Magazine, No. 306, pp. 38-62.Africa, BotswanaBeneficiation, production

Abstract: The President of Botswana, the Honorable Seretse Khama Ian Khama, has all the legitimate means to fix the plight of his country's ailing diamond-beneficiation sector, i.e., factory closings and the retrenchment of some 700 workers during the past few months. Only one thing is needed to turn the situation around: to muster the political will and courage to do so. This may sound like an impossible challenge given today's diamond market and economic realities - but it can be done. In fact, it must be done, according some stakeholders in Botswana. This isn't for someone from the outside to say. The president of Botswana heads an independent sovereign government, and it is up to him to set the policy priorities in his country.
DM201512-2246
2015
Even-Zohar, C.Violating the 11th commandment: thou shalt not discount… Supplier and Client stood eyeball-to-eyeball in price standoff - De Beers blinked first.Diamond Intellgence Briefing (Courtesy of Chaim), Vol. 30, no. 864, Oct. 26, 9p.GlobalNews item - De Beers
DM201512-2247
2015
Even-Zohar, C.The riddle of De Beers and $ 5 billion of "invisible" production… Diamond Intellgence Briefing (Courtesy of Chaim), Vol. 30, no. 863, Oct. 1, 9p.GlobalNews item - production figures
DS201506-0266
2015
Even-Zohar, C.Taxing the Antwerp diamond industry into prosperity.Idex Magazine, No. 301, pp. 111-117.EuropeEconomics
DS201507-0311
2015
Even-Zohar, C.Temporary color enhancement: a potential game changer for industry and grading labs.Diamond Intelligence Briefing ( Courtesy of Chaim), Vol. 30, no. 857, May 28, 8p.TechnologyDiamond - colours
DS201508-0354
2015
Even-Zohar, C.Temporary colour enhancement …. Treatment, story so far, timing, legal and commercial problems of dishonesty.Idex Magazine, No. 303, July pp. 36-62.TechnologyDiamond color enhancement
DS201504-0195
2015
Ewing, I.Ice, ice baby A frigid winter paves the way for Gahcho Kue.Canadian Institute of Mining and Metallurgy, March-April 2p.Canada, Northwest TerritoriesDeposit - Gahcho Kue
DS201510-1767
2015
Eyike, A., Ebbing, J.Lithospheric structure of the West and Central African Rift system from regional three dimensional gravity modelling. South African Journal of Geology, Vol, 118, no. 3, pp. 285-298.Africa, East AfricaGeophysics - gravity

Abstract: A three-dimensional interpretation of the central part of the West and Central African Rift System (WCARS) is presented using the Earth Gravity Model 2008 (EGM2008). The 3-D model presented here provides new insights into the regional lithospheric structure of the central sector of the WCARS. The 3-D model reveals a possible crustal thickness and density distribution beneath the rift system, and the depth extent of magmatic activity in the Benue Trough is revealed for the first time. Because of asthenospheric uplift, the crust under the Benue Trough is thinned. The zone of crustal thinning (<30 km) coincides with the trace of an intrusion beneath the trough, and the maximum of which is attained in the Yola Basin. The Adamawa and Kapsiki Plateaus, on the other hand, show by far the largest crustal thickness in the region (34 to 36 km). The inferred zone of intrusion coincides with the maximum gravity anomaly of the rift zone. The great depth (ca. 14 km) to the top of the intrusion along the rift may explain the absence of magmatism in the Benue Trough compared to the Cameroon Volcanic Line (CVL) or the East African Rift System (EARS). The relatively small nature of the intrusion leads to the conclusion that small-scale asthenospheric upwelling might be responsible for the thinning of the crust and subsequent rifting of the Benue Trough.
DS201501-0007
2014
Fahrenkamp-Uppenbrink, J.What drives Earth's thermodynamic engine?Science, Vol. 346, 6214, pp. 1184-1185.MantleAthenosphere, magmatism
DS201512-1917
2015
Fajber, R., Simandl, G.J., Luck, P., Neetz, M.Biogeochemical methods to explore for carbonatites and related mineral deposits: an orientation survey, Blue River area, British Columbia, Canada.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov. 13-14, pp. 241-244.Canada, British ColumbiaCarbonatite

Abstract: Carbonatites host economic deposits of niobium (Nb), rare earth elements (REE), phosphate, baddeleyite (natural zirconia), vermiculite, and fl uorspar, and historically, supplied copper, uranium, carbonate (for cement industries) and sodalite (Pell, 1994 and Simandl, this volume). The Upper Fir carbonatite is in southeastern British Columbia, approximately 200 km north of Kamloops (Fig. 1). It is one ofmany known carbonatite occurrences in the British Columbia alkaline province, which follows the Rocky Mountain Trench and extends from the southeastern tip of British Columbia to its northern boundaries with the Yukon and Northwest Territories (Pell, 1994). The Upper Fir is a strongly deformed carbonatite with an indicated mineral resource of 48.4 million tonnes at 197 ppm of Ta2O5 and 1,610 ppm of Nb2O5, and an inferred resource of 5.4 million tonnes at 191 ppm of Ta2O5 and 1760 ppm of Nb2O5 (Kulla et al. 2013). The Nb, Ta, and vermiculite mineralization is described by Simandl et al. (2002, 2010), Chong, et al, (2012), and Chudy (2014). In this document we present the results of an orientation survey designed to determine the biogechemical signature of a typical carbonatite in the Canadian Cordillera. This survey suggests that needles and twigs of White Spruce (Picea glauca) and Subalpine Fir (Abies lasio carpa) are suitable sampling media to explore for carbonatites and carbonatite-related rare earth elements (REE), niobium (Nb), and tantalum (Ta) deposits.
DS201511-1834
2015
Fedortchouk, Y.Diamond resorption features as a new method of examining conditions of kimberlite emplacement.Contributions to Mineralogy and Petrology, Vol. 170, 19p.GlobalDiamond morphology - etch pits

Abstract: The study develops a new approach utilizing parameters of trigonal etch pits on diamond crystals to infer the conditions of diamond residence in kimberlite magma. Diamond crystals from dissolution experiments conducted at 1 GPa and 1150-1350 °C in the presence of H2O-rich or CO2-rich fluid were studied with atomic force microscopy (AFM). The AFM data of resorbed diamond surfaces show that much deeper surface relief was produced in CO2 fluid. It also clearly distinguishes the profiles of the trigonal etch pits forming regular flat-bottomed trigons in H2O fluid, and round- or pointed-bottomed trigons in CO2 fluid. The relationship between the diameter and the depth of the trigonal pits is found to be another important indicator of the fluid composition. Dissolution in H2O fluid develops trigons with constant diameter and variable depth where the diameter increases with temperature. Trigons developed in CO2 fluid have a large range of diameters showing a strong positive correlation with the depth. The developed criteria applied to the natural diamond crystals from three Ekati Mine kimberlites indicate significant variation in CO2-H2O ratio and temperature of their magmatic fluid. This conclusion based on diamond resorption agrees with the mineralogy of microphenocrysts and groundmass of the studied kimberlites offering new method to study crystallization conditions of kimberlite magma. Keywords
DS201512-1918
2015
Feng, J., Tappert, M.C., Rivard, B.A., Fulop, A., Rogge, D., Tappert, R.Acquiring crustal dilution dat a and kimberlite compositional information from drill core using SWIR hyper spectral imagery from the Tango extension kimberlite.43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 39.Canada, Northwest TerritoriesDeposit - Tango

Abstract: Short-wave infrared (SWIR, 1.90-2.36 µm) hyperspectral imagery collected from 171 meters of drill core from the diamondiferous Tango Extension kimberlite using a high spatial resolution imaging system (pixel size: 1.43 x 1.43 µm) was analyzed to create compositional maps that show the distribution of different crustal (dilution) components and different kimberlite types along the drill core. Three types of crustal dilution components were identified in the compositional maps: carbonate, a carbonate-mudstone mixture, and mudstone. Five spectrally distinct types of kimberlite were identified, which differ mainly in their level of hydration and the amount of crustal micro-dilution they contain. Accompanying the compositional maps are depth profiles that provide quantitative abundance information for each compositional component (dilution and kimberlite). These profiles show the abundance of macro-dilution relative to kimberlite and the spatial distribution of the different kimberlite types. Using depth profiles, compositional boundaries along the length of the drill core were identified and compared to the unit boundaries from the visual lithological log. The boundaries identified using the hyperspectral imagery correlate well with the boundaries recorded during visual logging. This study demonstrates that hyperspectral imagery is well suited to the task of mapping the distribution of spectrally distinct kimberlite types, and quantifying kimberlite micro- and macro-dilution by crustal rocks.
DS201501-0008
2014
Fernandes, A.F., Karfunkel, J., Hoover, D.B., Sgarbi, P.B.De Al., Sgarbo, G.N.C., Oliveira, G.D., Gomes, J.C.de S.P., Kambrock, K.The basal conglomerate of the Capacete Formation ( Mat a da Corda Group) and its relation to diamond distributions in Coromandel, Minas Gerais State, Brazil.Brazil Journal of Geology, Vol. 44, 1, pp. 91-103.South America, BrazilCoromandel district

Abstract: The diamond bearing district of Coromandel is located in the northwestern part of Minas Gerais, within the Alto Paranaíba Arch, famous for the discovery of most of Brazil's large diamonds above 100 ct. Detailed mapping, aimed at characterizing the Mata da Corda Group of Upper Cretaceous age of Coromandel, has been carried out. This Group was divided into the Patos Formation, composed of kimberlitic and kamafugitic rocks, and the Capacete Formation, presented by conglomerates, pyroclastic rocks, arenite and tuffs. Exposures of the latter Formation have been studied in detail at the small abandoned mine called Canastrel, as well as in the headwater of Santo Antônio do Bonito River. The results have been compared to studies of the kimberlite bodies in the nearby Douradinho River. Kimberlite indicator minerals from these localities show the same compositional trend. Moreover, in the basal conglomerate of the Garimpo Canastrel two diamonds diamonds have been recovered and described. The Garimpo Wilson, situated in the headwater of the river Santo Antônio do Bonito in paleo-alluvium, is composed of material exclusively derived from the erosion of the Capacete Formation and Precambrian (sterile) Canastra quartzites and schists. These detailed investigations suggest that the basal conglomerates of the Capacete Formation represent the main source rock of the alluvial diamond deposits in the Coromandel region.
DS201505-0250
2015
Ferracutti, G.R., Gargiulo, M.F., Ganuza, M.L., Bjerg, E.A., Castro, S.M.Determination of the spinel group end-members based on electron microprobe analyses.Mineralogy and Petrology, Vol. 109, 2, pp. 153-160.TechnologyGeochronology
DS201511-1835
2012
Ferreira, J.Motete dyke project … preliminary diamond grade and tonnage model for the Motete dyke.MSA Group for Paragon Diamonds, April, 17p. Available pdfAfrica, LesothoMicrodiamonds - responses

Abstract: The Motete Dyke is a diamondiferous kimberlite situated in the mountains of Lesotho. Total liberation diamond recovery methods were used to analyse representative samples from localities along the 1 500 m outcrop length of the dyke for grade modeling purposes. The microdiamond grade and stone density is remarkably consistent throughout the exposed area of the dyke. A grade of some 60 cpht at +1.18 mm and 90 cpht at +0.85 mm is estimated for the dyke at surface. In order to extend the estimate to deeper levels it will be necessary to drill into the dyke to obtain more sampling material for total liberation analysis. Initial tonnage calculations indicate that the dyke contains an estimated 525 000 carats at +0.85 mm with an additional 50 000 carats in every additional 10 m depth below 2450 m elevation, assuming an average dyke width of 1.44 m and density of 2.57 tons/m3. Bulk sampling of the dyke is recommended to recover a parcel of diamonds for valuation and to confirm the diamond size frequency and content model.
DS201506-0267
2015
Ferrero, S., Wunder, B., Walczak, K., O'Brien, P.J., Ziemann, M.A.Preserved near ultrahigh-pressure melt from continental crust subducted to mantle depths.Geology, Vol. 43, 5, pp. 447-450.MantleBohemian
DC201501-1483
2014
Firestone Diamonds plc.Liqhobong mine development project update.Firestone Diamonds plc., Dec. 2, 3p.Africa, LesothoNews item - press release
DC201504-1484
2015
Firestone Diamonds plc.Highlights from results six months to 31 December. Liqobong, BK-11, financesFirestone Diamonds plc., Mar. 12, 14p.Africa, Lesotho, BotswanaNews item - press release
DC201506-1485
2015
Firestone Diamonds plc.Proposed standby debt facility and restructuring of the existing mezzanine facility. LiqhobongFirestone Diamonds plc., Apr. 24, 3p.Africa, LesothoNews item - press release
DC201507-1486
2015
Firestone Diamonds plc.Liqhobong mine development project update.Firestone Diamonds plc., June 23, 4p.Africa, LesothoNews item - press release
DC201508-1487
2015
Firestone Diamonds plc.Sale of Botswana operations. BK11 mine to Tango.Firestone Diamonds plc., July 9, 2p.Africa, BotswanaNews item - press release
DC201511-2381
2015
Firestone Diamonds plc.Update on the sale of the Botswana operations to Tango Mining Limited … requested an extension to the timetable.Firestone Diamonds plc., Oct. 2, 1p.Africa, BotswanaNews item - press release
DC201511-2382
2015
Firestone Diamonds plc.Final results for year ended 30 June 2015. Liqhobong on budget.. Capital investment US $ 82.9 million … restructuring of Botswana assets.Firestone Diamonds plc., Oct. 6, 3p.Africa, LesothoNews item - press release
DC201511-2383
2015
Firestone Diamonds plc.Update on the sale of the Botswana operations and extension to Tango to April 8, 2016.Firestone Diamonds plc., Oct. 13, 1p.Africa, BotswanaNews item - press release
DS201504-0196
2012
Firsching, M., Muhlbauer, J., Nachtrab, F., Jobst, A.Basis material decomposition a quantitative X-ray imaging method and its application in industrial sorting.International Symposium on Digital Industrial Radiology and computed Tomography, Poster 13, 5p.TechnologyDiamond recovery
DS201504-0197
2012
Firsching, M., Muhlbauer, J., Nachtrab, F., Uhlmann, N.Detection of enclosed diamonds using dual energy X-ray imaging.18th. World Conference on Nondestructive Testing held Durban SA, 7p.TechnologyDiamond recovery
DS201502-0056
2015
Firsov, A., Ashchepkov, I., Rikhvanov, L.The alkali basaltic and picritic magmatism in Minusa and Kusnetsk basin - geochemical study.Economic Geology Research Institute 2015, Vol. 17,, # 2797, 1p. AbstractRussiaPicrite
DC201512-2432
2015
Five Star Diamonds LimitedListing in H1 2016 The company plans to develop a 3.5 hectare kimberlite pipe at its Catalano project, Goias district.ProactiveInvestors @sut8.co.uk, Nov. 27, 1p.South America, BrazilNews item - Five Star Diamonds
DM201510-2040
2015
ForbesCulli nan Heritage diamond 507.55 Carat type 11a has been cut by Chow Tai Fook …Forbes Magazine, Sept. 4p.Africa, South AfricaNews item - diamond notable
DS201501-0009
2014
Fournier, D., Heagy, L., Corcoran, N., Cowan, D., Devriese, S.G.R., Bild-Enkin, D., Davis, K., Kang, S., Marchant, D., McMillan, M.S., Mitchell, M., Rosenkjar, G., Yang, D., Oldenburg, D.W.Multi-EM systems inversion - towards a common conductivity model for Tli Kwi Cho complex.SEG Annual Meeting Denver, 5p. Extended abstractCanada, Northwest TerritoriesDeposit - Tli Kwi Cho, geophysics

Abstract: The magnetic and electromagnetic responses from airborne systems at Tli Kwi Cho, a kimberlite complex in the Northwest Territories, Canada, have received considerable attention over the last two decades but a complete understanding of the causative physical properties is not yet at hand. Our analysis is distributed among three posters. In the first we find a 3D magnetic susceptibility model for the area; in the second we find a 3D conductivity model; and in the third we find a 3D chargeability model that can explain the negative transient responses measured over the kimberlite pipes. In this second paper we focus upon the task of finding a conductivity model that is compatible with three airborne data sets flown between 1992 and 2004: one frequency-domain data set (DIGHEM) and two time-domain systems (AeroTEM and VTEM). The goal is to obtain a 3D model from which geologic questions can be answered, but even more importantly, to provide a background conductivity needed to complete the 3D IP inversion of airborne EM data. We begin by modifying our pre-existing 1D frequency and time domain inversion codes to produce models that have more lateral continuity. The results are useful in their own right but we have also found that 1D analysis is often very effective in bringing to light erroneous data, assisting in estimating noise floors, and providing some starting information for developing a background model for the 3D EM inversion. Here we show some results from our Laterally Constrained Inversion (LCI) framework. The recovered conductivity models seem to agree on the general location of the kimberlite pipes but disagree on the geometry and conductivity values at depth. The complete 3D inversions in time and frequency, needed to resolved these issues, are currently in progress.
DS201509-0396
2015
France, L., Chazot, G., Kornprobst, J., Dallai, L., Vannucci, R., Gregoire, M., Bertrand, H., Boivin, P.Mantle refertilization and magmatism in old orogenic regions: the role of late-orogenic pyroxenites.Lithos, Vol. 232, pp. 49-75.Africa, Morocco, Cameroon, Jordan, Europe, FranceXenoliths

Abstract: Pyroxenites and garnet pyroxenites are mantle heterogeneities characterized by a lower solidus temperature than the enclosing peridotites; it follows that they are preferentially involved during magma genesis. Constraining their origin, composition, and the interactions they underwent during their subsequent evolution is therefore essential to discuss the sources of magmatism in a given area. Pyroxenites could represent either recycling of crustal rocks in mantle domains or mantle originated rocks (formed either by olivine consuming melt-rock reactions or by crystal fractionation). Petrological and geochemical (major and trace elements, Sr-Nd and O isotopes) features of xenoliths from various occurrences (French Massif-Central, Jordan, Morocco and Cameroon) show that these samples represent cumulates crystallized during melt percolation at mantle conditions. They formed in mantle domains at pressures of 1-2 GPa during post-collisional magmatism (possibly Hercynian for the French Massif-Central, and Panafrican for Morocco, Jordan and Cameroon). The thermal re-equilibration of lithospheric domains, typical of the late orogenic exhumation stages, is also recorded by the samples. Most of the samples display a metasomatic overprint that may be either inherited or likely linked to the recent volcanic activity that occurred in the investigated regions. The crystallization of pyroxenites during late orogenic events has implications for the subsequent evolution of the mantle domains. The presence of large amounts of mantle pyroxenites in old orogenic regions indeed imparts peculiar physical and chemical characteristics to these domains. Among others, the global solidus temperature of the whole lithospheric domain will be lowered; in turn, this implies that old orogenic regions are refertilized zones where magmatic activity would be enhanced.
DS201505-0253
2015
Fraser InstituteFraser Institute annual survey for 2014. Mining jurisdictions listed.Fraser Institute, 97p. PdfGlobalLegal
DS201504-0198
2015
Frezzotti, M.L., Ferrando, S.The chemical behaviour of fluids released during deep subduction based on fluid inclusions.American Mineralogist, Vol. 100, pp. 352-377.MantleSubduction
DS201512-1919
2015
Friis, H.Primary and secondary mineralogy of the Ilimaussaq alkaline complex, south Greenland.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov. 13-14, pp. 83-90.Europe, GreenlandAlkalic

Abstract: The Ilímaussaq alkaline complex is among the largest known alkaline complexes in the world and has been studied since the early 19th century, when Giesecke explored Greenland for minerals. More than 230 different mineral species occur in the complex. Ilímaussaq is the type locality for 34 minerals, including 15 that have not been reported elsewhere. Some of these are rock-forming minerals and thus, although unique to Ilímaussaq, may not be considered rare. Among the minerals fi rst described from Ilímaussaq are two important sources for critical materials: steenstrupine- (Ce) and eudialyte (Table 1). Steenstrupine-(Ce) is the main target mineral for the Kvanefjeld multi-element project in the northern part of Ilímaussaq, whereas eudialyte is targeted at the Tanbreez project in the southern part known as Kringlerne (Fig. 1). The fi rst detailed mapping and petrological studies of the complex were published by Ussing (1912), who also defi ned the term ‘agpaitic’ for rocks where the molar ratio (Na+K)/ Al is greater than or equal to 1.2. Since then, the distinction between agpaitic and miaskitic has changed from being based on just rock chemistry to being based more on mineral paragenesis. Sørensen (1997) defi ned agpaitic as peralkaline rocks in which High Field Strength Elements (HFSE; e.g., Zr and Ti) are hosted in complex minerals such as eudialyte and rinkite. Rocks with high alkalinity, where HFSE are hosted in minerals such as zircon, are considered miaskitic. Khomyakov (1995) further developed the agpaitic classifi cation by introducing the term hyperagpaitic for the most evolved syenites. Hyperagpaitic rocks are characterised by containing water soluble minerals (e.g., natrosilite and natrophosphate) and complex phosphosilicates (e.g., steenstrupine-(Ce) and vuonnemite; Khomyakov, 1995). The Ilímaussaq complex is one of several alkaline complexes formed during Mesoproterozoic rifting in the southwestern part of Greenland, which collectively is called the Gardar province (Upton, 2013). With an age of ~1.6 Ga, Ilímaussaq is the youngest major intrusion of the Gardar province (Waight et al., 2002; Krumrei et al., 2006).
DS201506-0268
2015
Frizon de Lamotte, D., Fourdan, B., Leleu, S., Leparmentier, F., de Clarens, P.Style of rifting and the stages of Pangea break up.Tectonics, Vol. 34, 5, pp. 1009-1029.Global, RussiaPangea
DS201501-0010
2003
FulgroHeliFALCONtm gravity gradiometer Gahcho Kue kimberlite pipes. ( Kennady Lake JV)fugro.com, 2p.Canada, Northwest TerritoriesDeposit - Gahcho Kue geophysics
DS201505-0233
2015
Furlani, S., Ninfo, A.Is the present the key to the future?Earth Science Reviews, Vol. 142, pp. 38-46.GlobalGeomorphology
DS201501-0011
2015
Fusciardi, L.De Beers Canada - technology and innovation across the diamond value chain.PDAC 2015, 1/4p. AbstractCanadaDe Beers
DS201503-0144
2015
Gaillou, E., Post, J.E., Byne, K.S., Butler, J.E.Study of the Blue Moon diamond. ( from Cullinan)Gems & Gemology, Vol. 50, 4, winter 2014, 9p.Africa, South AfricaDiamonds notable

Abstract: The Blue Moon diamond, discovered in January 2014 at the historic Cullinan mine in South Africa, is of significance from both trade and scientific perspectives. The 29.62 ct rough yielded a 12.03 ct Fancy Vivid blue, Internally Flawless gem. The authors were provided the opportunity to study this rare diamond at the Smithsonian Institution before it went on exhibit at the Natural History Museum of Los Angeles County. Infrared spectroscopy revealed that the amount of uncompensated boron in the diamond was 0.26 ± 0.04 ppm, consistent with measurements of several large type IIb blue diamonds previously studied. After exposure to short-wave ultraviolet light, the Blue Moon displayed orange-red phosphorescence that remained visible for up to 20 seconds. This observation was surprising, as orange-red phosphorescence is typically associated with diamonds of Indian origin, such as the Hope and the Wittelsbach-Graff. Time-resolved phosphorescence spectra exhibited peaks at 660 and 500 nm, typical for natural type II blue diamonds. As with most natural diamonds, the Blue Moon showed strain-induced birefringence.
DS201504-0199
2015
Gannoun, A., Burton, K.W., Barfod, D.N., Schiano, P., Vlastelic, I., Halliday, A.N.Resolving mantle and magmatic processes in basalts from the Cameroon volcanic line using the Re-Os isotopic system.Lithos, Vol. 224-5, pp. 1-12.Africa, CameroonAlkaline rocks, basalts
DS201508-0355
2015
Garanin, V.K.The Fersman mineralogical museum in the 21st century: past, present and future,Mineral @fmmm.ru, Vol. 18, 3, pp. 24-41.RussiaHistory - Fersman
DS201506-0269
2014
Garanin, V.K., Leybov, M.B.Diamonds: a sketch portrait (History of discovery of Russian deposits and their genesis).Mineralogical Almanac, Vol. 19, 1, pp. 30-47.RussiaHistory
DC201504-1488
2015
Gem Diamonds LimitedFull year results for the period ending 31 December 2014.Gem Diamonds Limited, Mar. 17, 3p.AfricaNews item - Gem Diamonds
DC201504-1489
2015
Gem Diamonds LimitedFull year 2014 results… Letseng, Ghaghoo.Gem Diamonds Limited, Mar. 17, 3p.Africa, Lesotho, BotswanaNews item - press release
DC201506-1490
2015
Gem Diamonds LimitedSales and operational update … Letseng, Ghaghoo.Gem Diamonds Limited, May 21, 6p.Africa, Lesotho, BotswanaNews item - press release
DC201509-1491
2015
Gem Diamonds LimitedTrading update and projects Letseng and Ghaghoo performances.Gem Diamonds Limited, July 30, 3p.Africa, Lesotho, BotswanaNews item - press release
DC201510-2347
2015
Gem Diamonds LimitedSale of 357 ct. Letseng diamond $ 19.3 m Gem Diamonds Limited, Sept. 14, 1p.Africa, LesothoNews item - press release
DS201507-0312
2015
Gernon, T.M., Spence, S., Trueman, C.N., Taylor, R.N., Rohling, E., Hatter, S.J., Harding, I.C.Emplacement of Cabezo Maria lamproite volcano (Miocene) SE Spain.Bulletin of Volcanology, Vol. 77, 6, pp. 52-Europe, SpainLamproite
DS201510-1768
2015
Gerya, I.T.Tectonic overpressure and underpressure in lithospheric tectonics and metamorphism.Journal of Metamorphic Geology, Vol. 33, 8, pp. 785-800.MantleTectonics

Abstract: The lithostatic pressure concept is most commonly applied on a geological scale for lithospheric processes and related evolution of metamorphic rock complexes. Here, various aspects of non-lithostatic overpressure and underpressure phenomena in lithospheric tectonics and metamorphism are reviewed on the basis of recently published literature. The main conclusion from this short review is that these phenomena certainly exist in nature on all time and space scales including geological ones. They are, in particular, responsible for some geological processes, which are otherwise difficult to explain, such as downward water suction into the interior of subducting slabs. Magnitudes of overpressure and underpressure are strongly variable and may potentially reach up to ±100% of the lithostatic pressure and up to a GPa-level. These magnitudes depend mainly on the rheology of deforming rocks and on the nature of related tectonic process. Rheological heterogeneity of deforming rock units, which is common in nature, has a tendency to enhance overpressure and underpressures. Large overpressure can typically be expected in rheologically strong (dry) bending rock units, in particular in the mantle lithosphere. However, rheological weakness of rocks and small local deviatoric stresses do not guarantee the absence of large overpressures in these rocks. Therefore, the influence of significant tectonic overpressure and/or underpressure cannot be excluded for any metamorphic complex a priori but should be instead tested by exploring realistic thermomechanical models for envisaged tectono-metamorphic scenarios. Many lithospheric rocks subjected to large overpressures and underpressures cannot be studied as they do not exhume to the surface. Some controversy exists concerning overpressure magnitudes for the ultrahigh-pressure (UHP) rocks and several conflicting hypotheses are proposed, which need to be thoroughly tested in the future. In this respect, the Alpine region may offer a unique opportunity for the testing of geological-scale overpressures in (U)HP rocks by combining structural-geological and petrological data with realistic lithospheric-scale numerical modelling.
DS201502-0057
2014
Gifford, J.N., Mueller, P.A., Foster, D.A, Mogk, D.W.Precambrian crustal evolution in the Great Falls Tectonic Zone: insights from xenoliths from the Montana Alkali province.Journal of Geology, Vol. 122, Sept. pp. 531-548.United States, MontanaAlkalic
DS201507-0313
2015
Gilio, M., Clos, F., Van Roermund, H.L.M.The Frimingen garnet peridotite ( central Swedish Caledonides). A good example of the characteristic PTt path of a cold mantle wedge garnet peridotite.Lithos, Vol. 230, pp. 1-16.Europe, SwedenPeridotite
DS201505-0235
2015
Giuliani, G.,Pivin, M., Fallick, A.E., Ohnenstetter, D., Song, Y., Demaiffe, D.Geochemical and oxygen isotope signatures of mantle corundum megacrysts from the Mbuji-Mayi kimberlite, Democratic Republic of Congo and the Changle alkali basalt, China.Comptes Rendus Geoscience, Vol. 347, 1, pp. 24-34.Africa, Democratic Republic of Congo, ChinaDeposit - Mbuji-Mayi
DS201512-1920
2015
Gokhale, M., Madhura, Somani, R., RakeshFullerenes: chemistry and its applications.Mini-Reviews in Organic Chemistry, Vol. 12, 4, pp. 355-366.TechnologyFullerenes

Abstract: Fullerenes being allotropes of carbon, have been considered as new class of molecules. Unlike diamond and graphite, this is made up of hollow carbon cage structure. The idea of spheroidal cage structures of C60 arose from construction of geodesic domes made by renowned architect Buckminster Fuller. Although fullerenes have low solubility in physiological media they finds promising biological applications. The photo, electrochemical and physical properties of C60 and other fullerene derivatives finds applications in medical fields. The ability of fullerenes to fit inside the hydrophobic cavity of HIV proteases makes them potential inhibitor for substrates to catalytic active site of enzyme. It possesses radical scavenging and antioxidant property. At the same time, when it exposed to light it can form singlet oxygen in high quantum yields which with direct electron transfer from excited state of fullerenes and DNA bases finally results in cleavage of DNA. The fullerenes are also used as a carrier for gene and drug delivery system. The associated low toxicity of fullerenes is sufficient to attract the researchers for investigation of these interesting molecules.
DC201502-1492
2015
Golden Saint Resources Ltd.Golden Saint samples diamond recoveries at Baja.Golden Saint Resources Ltd., Jan. 20, 1p.Africa, Sierra LeoneNews item - press release
DC201504-1493
2015
Golden Saint Resources Ltd.Golden Saint Resources has recovered a total of 233 carats of diamonds during the first stage of its bulk sampling programme at Baja.Golden Saint Resources Ltd., Mar. 10, 2p.Africa, Sierra LeoneNews item - press release
DC201505-1494
2015
Golden Saint Resources Ltd.Quarterly update .. Moa project, Baja project and Tongo project brief summaries.Golden Saint Resoures Ltd., Mar. 27, 1p.Africa, Sierra LeoneNews item - press release
DC201505-1495
2015
Golden Saint Resources Ltd.GSR boss says new licences mean full steam ahead in Sierra Leone.Golden Saint Resoures Ltd., Apr. 14, 1p.Africa, Sierra LeoneNews item - press release
DC201506-1496
2015
Golden Saint Resources Ltd.Operational update: bulk sampling at Tongo, 9.475 carat diamond.Golden Saint Resources Ltd., Apr. 27, 1p.Africa, Sierra LeoneNews item - press release
DC201506-1497
2015
Golden Saint Resources Ltd.Highlights … Baja,Moa.Golden Saint Resources Ltd., May 20, 40p.Africa, Sierra LeoneNews item - press release
DC201506-1498
2015
Golden Saint Resources Ltd.Operation update - two stones 9.65 and 0.775 from Tongo Golden Saint Resources Ltd., May 28, 1p.Africa, Sierra LeoneNews item - press release
DC201507-1499
2015
Golden Saint Resources Ltd.Operational update ongoing sampling exercise in Tongo.Golden Saint Resources Ltd., May 28,1p.Africa, Sierra LeoneNews item - press release
DC201508-1500
2015
Golden Saint Resources Ltd.Appointment of technical and exploration consultant…. Rock Forage Consulting Services. John WardGolden Saint Resources Ltd., June 30, 1p.Africa, Sierra LeoneNews item - press release
DC201508-1501
2015
Golden Saint Resources Ltd.Operational update to the market: diamonds found 2.25, 2.62, 4.41, 3.12, 89 carat under .05 caratGolden Saint Resources Ltd., July 3, 1p.Africa, Sierra LeoneNews item - press release
DC201510-2348
2015
Golden Saint Resources Ltd.Interim results .. Bulk sampling Tongo and Baja; Zimmi area artisanal.Golden Saint Resources Ltd., Sept. 21, 2p.Africa, Sierra LeoneNews item - press release
DC201511-2384
2015
Golden Saint Resources Ltd.Geological report on alluval and kimberlite of Baja, Tongo and Moa from Rock Forage consultants.Golden Saint Resources Ltd., Oct. 1, 2p.Africa, Sierra LeoneNews item - press release
DC201512-2433
2015
Golden Saint Resources Ltd.Placing, operational updates and board changes. Tongo bulk samplingGolden Saint Resources Ltd., Nov. 24, 1p.Africa, Sierra LeoneNews item - press release
DM201512-2248
2015
Goldie, R.Alrosa responds to weak Q3 markets.SalmanResearch @salmanpartners.com, Nov. 25, 1/4p.RussiaNews item - Alrosa
DS201504-0200
2015
Goldie, R.Diamonds .. Nominal US dollar price for rough diamonds graphThe 2015 Commodity Price Book, p. 31 ( I pg graph)GlobalPrice index
DS201506-0270
2015
Gomes de Moraes Rocha, L., Bittencourt Pires, A.C., Chatck Carmelo, A., Oksum, E.Curie surface of the alkaline provinces of Goias (GAP) and Alto Paranaiba ( APAP), central Brazil.Journal of Volcanology and Geothermal Research, Vol. 297, pp. 28-38.South America, BrazilKimberlites, Lineaments
DS201512-1921
2015
Gorbachev, N.S., Kostyuk, A.V., Shapovalov, Yu.B.Experimental study of the basalt-carbonate-H2O system at 4 Gpa and 1100-1300C: origin of carbonatitic and high-K silicate magmas.Doklady Earth Sciences, Vol. 464, 2, pp. 1018-1022.TechnologyCarbonatite
DS201501-0012
2014
Grad, M., Tiira, T., Olsson, S., Komminaho, K.Seismic lithosphere asthenosphere boundary beneath the Baltic Shield.GFF, Vol. 136, 4, pp. 581-598.Europe, Finland, Sweden, NorwayGeophysics - seismic

Abstract: The problem of the existence of the asthenosphere for old Precambrian cratons is still discussed. In order to study the seismic lithosphere-asthenosphere boundary (LAB) beneath the Baltic Shield, we used records of nine local earthquakes with magnitudes ranging from 2.7 to 5.9. To model the LAB, original data were corrected for topography and Moho depth using a reference model with a 46-km-thick crust. For two northern events at Spitsbergen and Novaya Zemlya, we observe a low-velocity layer, 60-70-km-thick asthenosphere, and the LAB beneath Barents Sea was found at depth of c. 200 km. Sections for other events show continuous first arrivals of P-waves with no evidence for "shadow zone" in the whole range of registration, which could either be interpreted as the absence of the asthenosphere beneath the central part of the Baltic Shield, or that the LAB in this area occurs deeper (>200 km). The relatively thin low-velocity layer found beneath southern Sweden, 15 km below the Moho, could be interpreted as small-scale lithospheric heterogeneities, rather than asthenosphere. Differentiation of the lower lithosphere velocities beneath the Baltic Shield could be interpreted as regional heterogeneity or as anisotropy of the Baltic Shield lithosphere, with high velocities approximately in the east-west direction, and slow velocities approximately in the south-north direction.
DS201502-0058
2015
Graedel, T.E., Nassar, N.T.The criticality of metals: a perspective for geologists.In: Ore deposits of an evolving Earth, Geological Society of London,, Special Publication no. 393, pp. 291-302.GlobalEconomics
DS201503-0145
2015
Green, D.H.Experimental petrology of peridotites, including effects of water and carbon on melting in the Earth's upper mantle.Physics and Chemistry of Minerals, Vol. 42, 2, pp. 95-122.MantlePeridotite

Abstract: For over 50 years, the use of high-pressure piston/cylinder apparatus combined with an increasing diversity of microbeam analytical techniques has enabled the study of mantle peridotite compositions and of magmas derived by melting in the upper mantle. The experimental studies have been guided by the petrology and geochemistry of peridotites from diverse settings and by the remarkable range of mantle-derived magma types. Recent experimental study using FTIR spectroscopy to monitor water content of minerals has shown that fertile lherzolite (MORB-source upper mantle) at ~1,000 °C can store ~200 ppm H2O in defect sites in nominally anhydrous minerals (olivine, pyroxenes, garnet and spinel). Water in excess of 200 ppm stabilizes amphibole (pargasite) at P < 3 GPa up to the lherzolite solidus. However, at P > 3 GPa, water in excess of 200 ppm appears as an aqueous vapour phase and this depresses the temperature of the upper mantle solidus. Provided the uppermost mantle (lithosphere) has H2O < 4,000 ppm, the mantle solidus has a distinctive P, T shape. The temperature of the vapour-undersaturated or dehydration solidus is approximately constant at 1,100 °C at pressures up to ~3 GPa and then decreases sharply to ~1,010 °C. The strongly negative dT/dP of the vapour-undersaturated solidus of fertile lherzolite from 2.8 to 3 GPa provides the basis for understanding the lithosphere/asthenosphere boundary. Through upward migration of near-solidus hydrous silicate melt, the asthenosphere becomes geochemically zoned with the ‘enriched’ intraplate basalt source (>500 ppm H2O) overlying the ‘depleted’ MORB source (~200 ppm H2O). From the study of primitive MOR picrites, the modern mantle potential temperature for MORB petrogenesis is ~1,430 °C. The intersection of the 1,430 °C adiabat with the vapour-saturated lherzolite solidus at ~230 km suggests that upwelling beneath mid-ocean ridges begins around this depth. In intraplate volcanism, diapiric upwelling begins from shallower depths and lower temperatures within the asthenosphere and the upwelling lherzolite is enriched in water, carbonate and incompatible elements. Magmas including olivine melilitites, olivine nephelinites, basanites, alkali picrites and tholeiitic picrites are consequences of increasing melt fraction and decreasing pressure at melt segregation. Major element, trace element and isotopic characteristics of island chain or ‘hot-spot’ magmas show that they sample geochemically distinct components in the upper mantle, differing from MORB sources. There is no evidence for higher-temperature ‘hot-spot’ magmas, relative to primitive MORB, but there is evidence for higher water, CO2 and incompatible element contents. The distinctive geochemical signatures of ‘hot-spot’ magmas and their ‘fixed’ position and long-lived activity relative to plate movement are attributed to melt components derived from melting at interfaces between old, oxidised subducted slabs (suspended beneath or within the deeper asthenosphere) and ambient, reduced mantle. In convergent margin volcanism, the inverted temperature gradients inferred for the mantle wedge above the subducting lithosphere introduce further complexity which can be explored by overlaying the phase relations of appropriate mantle and crustal lithologies. Water and carbonate derived from the subducted slab play significant roles, magmas are relatively oxidised, and distinctive primary magmas such as boninites, adakites and island arc ankaramites provide evidence for fluxing of melting in refractory harzburgite to lherzolite by slab-derived hydrous adakitic melt and by wedge-derived carbonatite.
DS201505-0246
2015
Griffin, W.L., Gain, S.E.M., Toledo, V., O'Reilly, S.Y., Jacob, D., Pearson, N.J.Corundum, moissanite and super reducing conditions in the upper mantle beneath the lower ( southern) Galilee ( Israel).Israel Geological Society, 1p.posterEurope, IsraelMineralogy
DC201504-1502
2015
Grizzly Discoveries Inc.Brief note on overview .. Buffalo Head Hills and Birch Mountains.Grizzley Discoveries Inc., Mar. 18, 1p.Canada, Saskatchewan, AlbertaNews item - press release
DC201506-1503
2015
Grizzly Discoveries Inc.Renewed interest in diamonds.. Buffalo Hills project.Grizzly Discoveries Inc., May 6, 1p.Canada, AlbertaNews item - press release
DS201502-0060
2015
Grocholski, B.A lower mantle water cycle component.Science, Vol. 347, 6220, Jan. 23, pp. 385-386.MantleWater
DS201509-0397
2015
Grocholski, B.Unlocking Earth's ancient magnetic past.Science, Vol. 349, 6247, pp. 490-492.MantlePaleomagnetism

Abstract: The magnetic field protects Earth's surface from deadly cosmic radiation and provides clues about the planet's interior. Tarduno et al. found that some of the oldest minerals on Earth, Jack Hills zircons, preserved a record of a magnetic field over 4 billion years ago (see the Perspective by Aubert). Earth's magnetic field appears to have been fully operational a mere few hundred million years after the planet formed. This suggests an early start for plate tectonics and an ancient cosmic radiation shield that was important for habitability.
DS201510-1769
2015
Grocholski, B.Broadening the source for hotspots.Science, Vol. 349, 6255, Sept. 25, pp. 1501-1502.MantleHotspots
DS201511-1836
2015
Grocholski, B.Coupled constraints on core formation.Science, Vol. 350, 6258, Oct. 16, pp. 289-290.MantleChemistry
DM201505-0782
2015
Grynberg, R.Diamond cutting industry in Botswana.Allafrica.com, Apr. 22, 2p.Africa, BotswanaNews item - opinion comments
DS201511-1837
2015
Gu, Y.J., Shen, L.Noise correlation tomography of southwest western Canada sedimentary basin. Geophysical Journal International, Vol. 202, pp. 142-162.Canada, AlbertaGeophysics - seismics

Abstract: We analyse continuous recordings from 23 broadband seismic stations near Alberta, the southwestern sector of the Western Canada Sedimentary Basin. Noise correlation tomo-graphy based on vertical-component seismograms reveals below-average shear velocities at shallow and middle crustal depths in central Alberta, spanning across Proterozoic accreted terranes and Archean microcontinents. This observation likely results from extensive plate convergence and crustal melting during the Proterozoic eon. The overall correlation between the crustal velocities and presumed basement domains is lower than expected, however. In the lower crust, the main pattern of shear velocities is relatively concordant with the reported domain boundaries and key Precambrian structures appear to be intact. The shear velocities beneath the Loverna Block, the largest constituent of the Hearne craton, are 10?per?cent higher than the regional average. This prominent northeast striking seismic anomaly is moderately correlated with the regional heat flow and potentially represents the remnant core of the Archean Hearne province. The associated high velocities extend into the western part of the Medicine Hat Block, a possible Archean microcontinent with a debatable origin, and contribute to a strong east-west structural gradient in the lower crust. The presence and the continuity of this anomalous structure imply extensive communications among the various basement domains in southern Alberta during the assembly of the North American continent.
DS201510-1770
2015
Gudmundsson, A.Collapse-driven large eruptions.Journal of Volcanology and Geothermal Research, Vol 304, pp. 1-10.MantleMagmatism

Abstract: For a typical poroelastic shallow crustal magma chamber, about 0.1% of the mafic magma and about 4% of the felsic magma are erupted and/or injected during magma-chamber rupture. Magma chambers with volumes of the order of several tens to several hundred cubic kilometres, as are common, are thus sufficiently large to supply magma to small or moderate eruptions. For large eruptions, however, a much higher percentage of the magma volume must be squeezed out of the chamber. For an ordinary poroelastic chamber, the excess pressure in the chamber falls exponentially during the eruption. For a large eruption to be possible, however, the excess pressure must be essentially maintained until the very end of the eruption. Here I show that caldera collapse can maintain the excess pressure through forced magma-chamber volume reduction, in which case a resulting large eruption would be the consequence (not the cause) of the collapse. I also show that ring-fault dip partly controls the size and intensity (volumetric flow or effusion rate) of the eruption. If the ring-fault dips inward (a normal fault), the displacement is ‘stable’, the volumetric flow rate (intensity) remains essentially constant during the collapse, and the magma chamber remains active following the collapse. By contrast, if the ring-fault dips outward (a reverse fault), the displacement is ‘unstable’, the volumetric flow rate normally increases dramatically during the collapse, and the magma chamber may be entirely destroyed during the collapse.
DS201506-0271
2015
Gueydan, F., Pitra, P., Afiri, A., Poujol, M., Essaifi, A., Paquette, J-L.Oligo-Miocene thinning of the Beni Bousera peridotites and their Variscan crustal host rocks, Internal Rif, Morocco.Tectonics, Vol. 34, pp.1244-1268.Africa, MoroccoPeridotite
DS201512-1922
2015
Guha, A., Kumar, K.V., Ravi, S., Dhananjaya Rao, E.N.Reflectance spectroscopy of kimberlites - in parts of Dharwar Craton, India.Arabian Journal of Geosciences, Vol. 8, no. 11, pp. 9373-9388.IndiaDeposit - Narayanpet

Abstract: In the present study, an attempt was made to analyse the reflectance spectra of kimberlites to evaluate its potential as key in remote sensing based spatial mapping. The spectral profiles of kimberlite samples were collected within the visible-near infrared-shortwave infrared (VNIR-SWIR) electromagnetic domain. In this regard, we analysed the reflectance spectra of three kimberlite pipes (having variable mineralogy) of Narayanpet kimberlite field (NKF) based on the comparative analysis of spectral features of kimberlite samples with the spectral features of their dominant constituent minerals. The relative abundances of each of the constituent minerals were confirmed using semiquantitative mineralogical data from X-ray diffraction analysis. This was supplemented with petrographical data as reference. We found that the absorption features imprinted in the reflectance spectra of kimberlites were mineralogically sensitive. These spectral features were imprinted by spectral features of serpentine, olivine, and calcite depending on the relative dominance of these minerals in kimberlites. With regard to understand the spectral behaviour of weathered residue of kimberlite for targeting buried kimberlite, we also attempted a comparative analysis of spectral profiles of in-situ soil developed above the pipes with the spectra of respective kimberlites in NKF area. While comparing aforementioned spectra, it was observed that the spectral signatures of NKF kimberlites were broadly translated to the in-situ soil. Further, we compared the spectral profiles of selected NKF kimberlites with the spectra of three distinct kimberlite pipes of Wajrakarur kimberlite field (WKF) characterised with similar mineralogy with respect to the selected NKF pipes. Relative dominance of constituent minerals (i.e., serpentine, olivine, calcite, etc.) in these pipes was taken as reference to identify the mineralogical similarity of the pipes of both the field. It was observed that the spectral profiles of NKF and WKF kimberlites were highly correlated with regard to wavelength of diagnostic absorption features. Finally, we also made an attempt to understand the effect of spectral mixing, in spectral separation of kimberlites and associated granite-granodiorite gneiss (i.e., Dharwar Gneiss). It was seen that the spectral contrast of kimberlite and gneiss was dependent on the relative size of the pipe with respect to pixel or ground sampling diameter of spectral data acquisition. Study confirmed the diagnostic nature of reflectance spectra of pipes along with their mineralogical sensitiveness and spatial integrity. It also highlighted how spectral mixing can influence the spectral feature based remote detection of kimberlites.
DS201511-1838
2007
Guidolin, M., La Ferrara, E.Diamonds are forever, war is not: is conflict bad for private firms?The American Economic Review, Vol. 97, 5, pp. 1978-1993.GlobalEconomics

Abstract: This paper studies the relationship between civil war and the value of firms in a poor, resource abundant country using microeconomic data for Angola. We focus on diamond mining firms and conduct an event study on the sudden end of the conflict, marked by the death of the rebel movement leader in 2002. We find that the stock market perceived this event as “bad news” rather than "good news" for companies holding concessions in Angola, as their abnormal returns declined by 4 percentage points. The event had no effect on a control portfolio of otherwise similar diamond mining companies. This finding is corroborated by other events and by the adoption of alternative methodologies. We interpret our findings in the light of conflict-generated entry barriers, government bargaining power and transparency in the licensing process.
DS201503-0146
2015
Guzmics, T., Zajacz, Z., Mitchell, R.H., Szabo, C., Walle, M.The role of liquid-liquid immiscibility and crystal fractionation in the genesis of carbonatite magmas: insights from Kerimasi melt inclusions.Contributions to Mineralogy and Petrology, Vol. 169, 18p.Africa, TanzaniaCarbonatite

Abstract: We have reconstructed the compositional evolution of the silicate and carbonate melt, and various crystalline phases in the subvolcanic reservoir of Kerimasi Volcano in the East African Rift. Trace element concentrations of silicate and carbonate melt inclusions trapped in nepheline, apatite and magnetite from plutonic afrikandite (clinopyroxene-nepheline-perovskite-magnetite-melilite rock) and calciocarbonatite (calcite-apatite-magnetite-perovskite-monticellite-phlogopite rock) show that liquid immiscibility occurred during the generation of carbonatite magmas from a CO2-rich melilite-nephelinite magma formed at relatively high temperatures (1,100 °C). This carbonatite magma is notably more calcic and less alkaline than that occurring at Oldoinyo Lengai. The CaO-rich (32-41 wt%) nature and alkali-"poor" (at least 7-10 wt% Na2O + K2O) nature of these high-temperature (>1,000 °C) carbonate melts result from strong partitioning of Ca (relative to Mg, Fe and Mn) in the immiscible carbonate and the CaO-rich nature (12-17 wt%) of its silicate parent (e.g., melilite-nephelinite). Evolution of the Kerimasi carbonate magma can result in the formation of natrocarbonatite melts with similar composition to those of Oldoinyo Lengai, but with pronounced depletion in REE and HFSE elements. We suggest that this compositional difference results from the different initial parental magmas, e.g., melilite-nephelinite at Kerimasi and a nephelinite at Oldoinyo Lengai. The difference in parental magma composition led to a significant difference in the fractionating mineral phase assemblage and the element partitioning systematics upon silicate-carbonate melt immiscibility. LA-ICP-MS analysis of coeval silicate and carbonate melt inclusions provides an opportunity to infer carbonate melt/silicate melt partition coefficients for a wide range of elements. These data show that Li, Na, Pb, Ca, Sr, Ba, B, all REE (except Sc), U, V, Nb, Ta, P, Mo, W and S are partitioned into the carbonate melt, whereas Mg, Mn, Fe, Co, Cu, Zn, Al, Sc, Ti, Hf and Zr are partitioned into the silicate melt. Potassium and Rb show no preferential partitioning. Kerimasi melt inclusions show that the immiscible calcic carbonate melt is strongly enriched in Sr, Ba, Pb, LREE, P, W, Mo and S relative to other trace elements. Comparison of our data with experimental results indicates that preferential partitioning of oxidized sulfur (as SO4 2?), Ca and P (as PO4 3?) into the carbonate melt may promote the partitioning of Nb, Ta, Pb and all REE, excluding Sc, into this phase. Therefore, it is suggested that P and S enrichment in calcic carbonate magmas promotes the genesis of REE-rich carbonatites by liquid immiscibility. Our study shows that changes in the partition coefficients of elements between minerals and the coexisting melts along the liquid line of descent are rather significant at Kerimasi. This is why, in addition to the REE, Nb, Ta and Zr are also enriched in Kerimasi calciocarbonatites. We consider significant amounts of apatite and perovskite precipitated from melilite-nephelinite-derived carbonate melt as igneous minerals can have high LREE, Nb and Zr contents relative to other carbonatite minerals.
DS201501-0013
2015
Gysi, A.P., Willams-Jones, A.E.The thermodynamic properties of Bastnasite-(Ce) and parisite-(Ce).Chemical Geology, Vol. 392, pp. 87-101.REE
DS201507-0314
2015
Hacker, B.R., Kelemen, P.B., Behn, M.D.Continental lower crust.Annual Review of Earth and Planetary Sciences, Vol. 43, pp. 167-205.MantleSubduction
DS201512-1923
2015
Haiblen, A.M., Ward, B.C., Normandeau, P.X., Prowse, N.D.Glacial history and landform genesis in the Lac de Gras area and implications for kimberlite drift prospecting.43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 43.Canada, Northwest TerritoriesGeomorphology

Abstract: During the last glaciation, bedrock was eroded, transported and deposited by the Laurentide Ice Sheet across much of Canada. The complex ice and meltwater processes that resulted in sediment deposition are not completely understood. In the central Slave Craton, Northwest Territories, glacial sediments overly many diamond-bearing kimberlites. Diamond deposits in the Lac de Gras area were discovered in the early 1990s by drift prospecting. To better interpret drift prospecting datasets a more thorough understanding of the detailed glacial history of the area is required. We spent six weeks in the Lac de Gras area in summer 2015. Field mapping was complimented by a number of other techniques to elucidate the glacial history of the area. Enigmatic landforms were examined in detail and pits were dug to examine their sedimentology. Samples of matrix material were collected to compare grain size distribution between different sediment types. Pebble counts were done to consider sediment provenance. We also collected ground-penetrating radar profiles to look for stratified sediments within enigmatic mounds. High-resolution orthophotos and a one metre LiDAR digital elevation model of the area, obtained by Dominion Diamond Ekati Corporation, have also been used to investigate landform genesis and the glacial history of the area. In the Lac de Gras area many meltwater corridors can be identified in the high-resolution imagery. These corridors are typically 300-1500 m wide and form dendritic networks. Between the corridors, sandy till of varying thickness overlies bedrock. Within corridors, glaciofluvial landforms and scoured bedrock are common. Also associated with corridors are many mounds of enigmatic origin. These mounds commonly occur in groups and are typically 20-100 m wide and rise 5-15 m above the surrounding area. They are usually composed of an unstratified to poorly-stratified sandy diamicton containing no clay and minor silt. Matrix grain size distribution and pebble lithology results from some mounds are similar to those of nearby regional till. However, patches of well-stratified sediments, exhibiting laminated silts as well as climbing ripples in sand, do exist on parts of some mounds. GPR data suggests that these patches are discontinuous, and that the majority of mounds are composed largely of sandy diamicton. Variation in the sedimentology of the mounds does not appear to be related to variations in mound morphology. It is likely that the majority of the glaciofluvial sediments in the Lac de Gras area were deposited during the final stages of ice retreat across the area when meltwater volumes were high. We suggest that the corridors were formed by subglacial meltwater flow. This is because glaciofluvial deposition almost exclusively occurs within corridors, very little till is found within corridors and the corridors have an undulating elevation profile in the direction of ice flow. Water must have played a role in the deposition of the well-stratified patches of sediment found on some mounds, however, the mounds may not be solely the product of subglacial meltwater flow. A thorough understanding of sediment transport and depositional processes is critical if kimberlite indicator mineral data is to be accurately interpreted.
DS201509-0398
2015
Hainschwang, T., Notari, F.The first undisclosed colourless CVD synthetic diamond discovered in a parcel of natural melee sized diamonds.The Journal of Gemmology, Vol. 334, 6, pp. 518-522.TechnologySynthetics

Abstract: During the March 2015 Diamond Show in Basel, Switzerland, a parcel of 6,000 melee-sized colourless diamonds was analysed using the GGTL Diamond Fluorescence Imaging (DFI) Laser+ fluorescence imaging and spectroscopy system. From the entire parcel, one sample stood out clearly with unusual fluorescence colours and distribution, combined with a photoluminescence spectrum that clearly indicated it was a synthetic diamond grown by chemical vapour deposition (CVD).
DS201503-0147
2014
Hainschwang, T., Notari, F., Vadaszi, E.The Rhodesian Star: an exceptional asteriated diamond.The Journal of Gemmology, Vol. 34, 4, pp. 306-315.Africa, ZimbabweDiamonds notable
DS201503-0148
2014
Hainschwang,T.Diamants de type 1b: relations entre les proprietes physiques et gemmologiques des diamants contenant de l'Azote Isole.Thesis, University of Nantes, France., In French * reference onlyTechnologyNitrogen
DS201512-1924
2015
Hallis, L.J., Huss, G.R., Nagashima, K., Taylor, G.J., Halldorsson, S.A.Evidence of primordial water in Earth's deep mantle.Science, Vol. 350, 6252 Nov. 13, pp. 795-797.MantleWater

Abstract: The hydrogen-isotope [deuterium/hydrogen (D/H)] ratio of Earth can be used to constrain the origin of its water. However, the most accessible reservoir, Earth’s oceans, may no longer represent the original (primordial) D/H ratio, owing to changes caused by water cycling between the surface and the interior. Thus, a reservoir completely isolated from surface processes is required to define Earth’s original D/H signature. Here we present data for Baffin Island and Icelandic lavas, which suggest that the deep mantle has a low D/H ratio (?D more negative than -218 per mil). Such strongly negative values indicate the existence of a component within Earth’s interior that inherited its D/H ratio directly from the protosolar nebula.
DS201506-0272
2015
Hamling, I.J., Wallace, L.M.Silent triggering: aseismic crustal faulting induced by a subduction slow slip event.Earth and Planetary Science Letters, Vol. 421, pp. 13-19.MantleSubduction
DS201510-1771
2015
Hammouda, T., Keshav, S.Melting in the mantle in the presence of carbon: review of experiments and discussion on the origin of carbonatites.Chemical Geology, in press availableMantleCarbonatite

Abstract: Carbon emission at volcanic centers requires a constant balance between output (mostly by volcanism, either at plate boundaries or intraplate) and input (mostly at trench settings) of carbon from and to the Earth's mantle. The form of carbon that resides in the mantle is controlled by depth (pressure) and oxygen fugacity, the latter in turn depending on the depth and the concentration of iron in the mantle. In the shallow, lithospheric mantle, carbon is likely to be present in the oxidized form of CO2 (except under cratons where carbon is reduced to graphite or diamond). Below approximately 90 km, in the asthenosphere, the oxidized form of carbon is carbonate, either mineral or melt, depending on the thermal regime. At depths greater than approximately 150 km, the asthenospheric mantle is too reducing for carbon to stay in its oxidized form and only diamond is present, unless there is sufficient hydrogen to form reduced C-H fluids. Hence, the region located in the depth range of 90 to 150 km deep is where carbonatitic melts can most likely be produced and impregnate the surrounding mantle through metasomatism. The upper bound of this region is called the carbonate ledge. This limit prevents carbonate (either solid or molten) from ascending because of degassing and CO2 liberation. The lower bound is a redox front where redox melting (that is, melting caused by oxidation) may take place in an ascending portion of carbon-containing mantle. Carbonatite eruptions and presence of carbonate mineral inclusions in deep-seated diamonds provide evidence that these boundaries can be trespassed in some cases. An analysis of the experimental data that has bearing on silicate melting in the presence of carbon further shows that the carbonate ledge is a melting curve with a negative or flat Clapeyron (dP/dT) slope. In the carbonated ultrabasic (peridotite) systems, the carbonate ledge is located between ~ 2-3 GPa. The ledge divides the pressure-temperature space into a region of low-pressure silicate melt production, and a high-pressure region where carbonatites can be produced. Carbonatitic melts in equilibrium with mantle peridotite have compositions close to dolomitic (approximately equal amounts of Ca and Mg) with a general trend of becoming markedly more magnesian with increasing pressure. Calcic carbonatites may be stable at pressures < 2 GPa if clinopyroxene is absent. At mantle transition zone pressure range, there seems to be a melting temperature decrease (negative fusion slope), which may be caused by the stabilization of majoritic garnet. The carbonated basic (broadly eclogitic) system is more complex than the peridotitic one, because of the strong control of bulk silicate composition on melting temperatures, and hence, on melt composition. In carbonated eclogite systems, we propose that the effect of bulk composition upon all observed features can perhaps be related to silica super-saturation, or lack thereof. In some cases, high calcium (> 80 mol% CaCO3) melts can be produced, making the melting of carbonated eclogites an appealing scenario for the genesis of calcio-carbonatites in the Earth's mantle. Comparison with modeled pressure-temperature paths of subducted oceanic lithosphere shows that fusion of carbonated eclogite at depths shallower than 200 km should be expected for hot (Cascadian-type) subduction thermal regimes. On the other hand, in the case of cooler thermal regimes (Honshu-type, for instance), subducted carbonates may be stable to greater depths in Earth at trench settings, depending on the bulk composition of the system. Furthermore, high-pressure experiments show evidence of a continuum among carbonatitic, kimberlitic, melilititic, and basaltic liquids, for increasing melting degree of carbonated peridotite. This continuum has not been documented in the case of fusion of carbonated eclogite. It may be present, however, when certain sediments are fused, although the silicate melts are granitic to rhyodacitic instead of being kimberlitic in composition. Additional high-pressure work on phase relations in the simple binary system CaCO3-MgCO3 and specific focus on oxide solubility in the vapor phase have the potential to further clarify phase relations on complex silicate-carbonate systems at mantle conditions.
DS201510-1772
2015
Hand, E.Mantle plumes seen rising from Earth's core.Science, Vol. 349, 6252, pp. 1032-1033.MantlePlume

Abstract: Mantle plumes, tubes of hot rock rising from Earth's core, have come into focus, ending a more than 40-year-long debate. The result comes from a sophisticated MRI-like tomographic model that used 273 large earthquakes to illuminate the interior of Earth. It revealed as many as 28 plumes, many of them underneath known volcanic hot spots at Earth's surface. The plumes are fatter than expected, which means that they carry more heat away from Earth's core, an indication that plumes are important for cooling the planet. The model also shows that the plumes bend at a depth of 1000 kilometers, which could indicate an undiscovered mineral phase transition in the lower mantle that makes it less stiff.
DS201512-1925
2015
Hand, E.How buried water makes diamonds and oils.Science, Vol. 350, 6261, pp. 613-614.TechnologyDiamond genesis

Abstract: Under high pressures, water can react with surrounding rock to make diamonds and oil. These are just two consequences of a new picture of water's versatile chemistry in the mantle. The Deep Earth Water model is showing that, under extreme pressures down to 200 kilometers, water can dissolve many ions and host unexpected new reactions. It is replacing a geochemical framework, published in 1981, which made predictions for water-rock interactions, but only down to 15 kilometers. The idea that oil can be made from water and rock in the mantle is controversial, because it has long been assumed that oil arises through the compaction and burial of organic matter.
DS201511-1839
2015
Hansen, V.L.Impact origin of Archean cratons.Lithosphere, Vol. 7, pp. 563-578,MantleImpacts

Abstract: Earth was a completely different planet more than 2.5 billion years ago. Little is known about this critical time when cratonic continental seeds formed; life emerged; and precious mineral resources concentrated. Our knowledge is limited because plate tectonic processes destroyed most of this early record. In contrast, Earth's sister, Venus -- similar in size, density, bulk composition, and distance from the Sun -- never developed plate tectonics. Venus also lacks a water cycle. Like siblings, Venus and Earth were most similar in their youth; however, Venus preserves a more complete geological record of its infancy, including both exogenic and endogenic features. Applying clues from Venus, Vicky L. Hansen proposes a new hypothesis for the formation of Earth's cratons. Large bolides pierced early thin lithosphere causing massive partial melting in the ductile mantle; melt escaped upward, forming cratonic crust; meanwhile strong, dry, buoyant melt residue formed cratonic roots, serving as unique buoyant life preservers during future plate-tectonic recycling.
DS201511-1840
2015
Harada, Y., Hishinuma, R., Terashima, C., Uetsuka, H., Nakata, K., Kondo, T., Yuasa, M., Fujishima, A.Rapid growth of diamond and its morphology by in-liquid plasma CVD.Diamond and Related Materials, in press available, 16p.TechnologySynthetics

Abstract: Diamond synthesis and its morphology by in-liquid plasma chemical vapor deposition (CVD) method are investigated in this study. Diamond films were grown on Si substrates from mixed alcohol solution. Very high growth rate of 170 ?m/h was achieved by this method. Microcrystalline and nanocrystalline diamond films were formed in different conditions. In the case of microcrystalline film, the shapes of diamond grains depend on the location in the film. All morphological differences in this study can be explained by the same mechanism of conventional gas phase CVD method. It means diamond morphology by in-liquid plasma CVD method can be controlled by process parameters as well as gas phase CVD method.
DS201512-1926
2015
Hardman, M.F., Stachel, T., Pearson, D.G., Kinakin, Y.B., Bellinger, J.Improving the utility of eclogitic garnet in diamond exploration - examples from Lac de Gras and worldwide localities.43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 47.Canada, Northwest TerritoriesGarnet chemistry

Abstract: In diamond exploration, the use of compositional data to identify diamond-related peridotitic xenocrysts has long been a widely used and powerful tool. In contrast, the application of similar methods to eclogitic garnet chemistry remains a challenge. The inability to unequivocally classify certain “eclogitic” garnet compositions as either mantle- or crust-derived implies that a high abundance of lower-crustal garnets will increase diamond-exploration expenditures by introducing a number of “false positives.” Revising existing classification schemes (e.g., Schulze, 2003) to reduce the abundance of “false positives” may, however, increase the number of “false negatives” through the misclassification of mantle-derived garnets as crustal. This study presents new geochemical and petrographical data for garnet and clinopyroxene from 724 kimberlite-hosted, crust- and mantle-derived xenoliths from localities worldwide, with a focus on samples whose lithology is constrained petrographically, rather than single mineral grains from concentrate. Mantle samples are primarily eclogitic and pyroxenitic, as constrained by mineral assemblage and garnet and clinopyroxene mineral chemistry, while crustal samples are dominantly plagioclase-bearing garnet-granulites. For those localities where an established geothermal gradient is available from literature resources, garnet-clinopyroxene pairs are employed in the estimation of pressure-temperature conditions of equilibration through the iterative coupling of the Krogh (1988) geothermometer and the relevant geothermal gradient. Our preliminary results suggest that closure temperatures for Fe-Mg exchange exceed the temperatures of residence of many lower-crustal samples, as geotherm-based calculated pressures of equilibration exceed the apparent stability of plagioclase (see Green and Ringwood, 1972). Comparison of equilibration pressures with sodium contents in garnet for mantle-derived samples (the diamond-facies criterion of Gurney, 1984) shows a positive correlation at localities for which an adequate range of pressures is observed (e.g., the Diavik mine). Other populations, such as mantle eclogitic garnets from Roberts Victor, plot at a much more restricted range of pressures and hence fail to demonstrate this correlation; instead, these samples may reflect the influence of a broader range of bulk-compositions, providing varying amounts of sodium to their constituent garnets. The results presented here demonstrate clearly that garnets from mantle- and crust-derived samples show significant overlap in geochemical character, for example in garnet Ca# vs. Mg# space (discrimination diagram of Schulze, 2003), where approximately 66% of our crust-derived garnet analyses plot in the “mantle” field. This percentage varies among locations. A selection of particularly high-Mg#, low-Ca# garnets derived from crustal, plagioclase-bearing lithologies in this study highlights the potential for crust-mantle confusion, as these garnets have Mg# in-excess of many mantle-derived eclogitic/pyroxenitic garnets. As a consequence, Fe-Mg-Ca-based classifications alone cannot reliably discriminate mantle and crustal garnets. The next step in this project will be to obtain trace element data for the entire sample suite. This will allow us to test the Li-geobarometer of Hanrahan et al. (2009) for eclogites and to search for trace element signatures that can be used as robust indicators of a diamond-facies origin of eclogitic garnets. Trace element data will also be employed in the refinement of the crust/mantle division discussed above.
DS201507-0315
2015
Harlow, G.E., Tsujimori, T., Sorensen, SS.Jadeites and plate tectonics.Annual Review of Earth and Planetary Sciences, Vol. 43, pp. 105-138.MantleJadeites
DS201511-1841
2015
Harris, J.R., Grunsky, E., Behnia, P., Corrigan, D.Dat a and knowledge-driven mineral prospectivity maps for Canada's north. (**note for Au )Ore Geology Reviews, Vol. 71, pp. 788-803.Canada, Nunavut, Melville PeninsulaGIS. IAS

Abstract: Data- and knowledge-driven techniques are used to produce regional Au prospectivity maps of a portion of Melville Peninsula, Northern Canada using geophysical and geochemical data. These basic datasets typically exist for large portions of Canada's North and are suitable for a "greenfields" exploration programme. The data-driven method involves the use of the Random Forest (RF) supervised classifier, a relatively new technique that has recently been applied to mineral potential modelling while the knowledge-driven technique makes use of weighted-index overlay, commonly used in GIS spatial modelling studies. We use the location of known Au occurrences to train the RF classifier and calculate the signature of Au occurrences as a group from non-occurrences using the basic geoscience dataset. The RF classification outperformed the knowledge-based model with respect to prediction of the known Au occurrences. The geochemical data in general were more predictive of the known Au occurrences than the geophysical data. A data-driven approach such as RF for the production of regional Au prospectivity maps is recommended provided that a sufficient number of training areas (known Au occurrences) exist.
DS201508-0356
2015
Harvey, J., Konig, S., Luguet, A.The effects of melt depletion and metasomatism on highly siderophile and strongly chalcophile elements: S-Se-Te-Re-PGE systematics of peridotite xenoliths from Kilbourne Hole, New Mexico.Geochimica et Cosmochimica Acta, Vol. 166, pp. 210-233.United States, New Mexico, Colorado PlateauPeridotite, xenoliths
DS201508-0357
2015
Hassan, R., Flament, N., Gurnis, M., Bower, D.J., Muller, D.Provenance of plumes in global convection models.Geochemistry, Geophysics, Geosystems: G3, Vol. 16, 5m pp. 1465-1489.AfricaConvection
DS201511-1842
2015
Hazen, R.M., Hystad, G., Downs, R.T., Golden, J.J., Pires, A.J., Grew, E.S.Earth's missing minerals.American Mineralogist, Vol. 100, pp. 2344-2347.TechnologyMineralogy

Abstract: Recent studies of mineral diversity and distribution lead to the prediction of >1563 mineral species on Earth today that have yet to be described-approximately one fourth of the 6394 estimated total mineralogical diversity. The distribution of these "missing" minerals is not uniform with respect to their essential chemical elements. Of 15 geochemically diverse elements (Al, B, C, Cr, Cu, Mg, Na, Ni, P, S, Si, Ta, Te, U, and V), we predict that approximately 25% of the minerals of Al, B, C, Cr, P, Si, and Ta remain to be described - a percentage similar to that predicted for all minerals. Almost 35% of the minerals of Na are predicted to be undiscovered, a situation resulting from more than 50% of Na minerals being white, poorly crystallized, and/or water soluble, and thus easily overlooked. In contrast, we predict that fewer than 20% of the minerals of Cu, Mg, Ni, S, Te, U, and V remain to be discovered. In addition to the economic value of most of these elements, their minerals tend to be brightly colored and/or well crystallized, and thus likely to draw attention and interest. These disparities in percentages of undiscovered minerals reflect not only natural processes, but also sociological factors in the search, discovery, and description of mineral species.
DS201502-0061
2015
He, L.Thermal regime of the North Chin a craton: implications for craton destruction.Earth Science Reviews, Vol. 140, pp. 14-26.ChinaGeothermometry
DS201508-0358
2015
He, X-F., Santosh, M., Zhang, Z-M., Tsunogae, T., Chetty, T.R.K., Ram Moham, M., AnbazhaganShonkinites from Salem, southern India: implications for Cryogenian alkaline magmatism in rift related setting.Journal of Asian Earth Sciences, in press availableIndiaShonkinites
DS201504-0201
2015
Heaman, L.M., Pell, J., Grutter, H.S., Creaser, R.A.U-Pb geochronology and Sr/Nd isotope compositions of groundmass perovskite from the newly discovered Jurassic Chidliak kimberlite field, Baffin Island, Canada.Earth and Planetary Science Letters, Vol. 415, April pp. 183-189.Canada, Nunavut, Baffin IslandDeposit - Chidliak
DS201506-0273
2015
Herzog, F.A.The potential of a portable EDXRF spectrometer for gemmology. ( not specific to diamond)The Journal of Gemmology, Vol. 34, 5, pp. 404-418.TechnologySpectroscopy
DS201501-0014
2015
Hetman, C.Canadian diamonds: past, present and future.PDAC 2015, 1p. AbstractCanadaHistory
DS201503-0149
2015
Hill, P.J.A., Kopylova, M., Russell, J.K.Mineralogical controls on garnet composition in the cratonic mantle.Contributions to Mineralogy and Petrology, Vol. 169, 20p.MantleGarnet mineralogy
DS201512-1927
2015
Hiyate, A.Botswana beckons. Prolific diamond nation attracts explorers.Diamonds in Canada Magazine, Northern Miner, Nov. pp. 14-17.Africa, BotswanaOverview of companies
DS201502-0062
2014
Hoag, H.Earth's deep crust could support Wide spread life.Nature, Dec. 23, 1p.MantleMicrobial ecosystems
DC201511-2385
2015
Honey Badger Exploration Inc.Honey Badger Exploration receives TSX-V approval for LG diamonds project.Honey Badger Exploration Inc., Oct. 22, 1p.Canada, Quebec, James Bay LowlandsNews item - press release
DC201512-2434
2015
Honey Badger Exploration Inc.Honey Badger exploration identifies priority targets at its LG diamonds project.Honey Badger Exploration Inc., Nov. 19, 2p.Canada, QuebecNews item - press release
DS201509-0399
2015
Hongsresawat, S., Panning, M.P., Russo, R.M., Foster, D.A., Monteiller, V., Chevrot, S.USArray shear wave splitting shows seismic anisotropy from both lithosphere and asthenosphere.Geology, Vol. 43, 8, pp. 667-670.United StatesSeismic -anisotropy

Abstract: North America provides an important test for assessing the coupling of large continents with heterogeneous Archean- to Cenozoic-aged lithospheric provinces to the mantle flow. We use the unprecedented spatial coverage of the USArray seismic network to obtain an extensive and consistent data set of shear wave splitting intensity measurements at 1436 stations. Overall, the measurements are consistent with simple shear deformation in the asthenosphere due to viscous coupling to the overriding lithosphere. The fast directions agree with the absolute plate motion direction with a mean difference of 2° with 27° standard deviation. There are, however, deviations from this simple pattern, including a band along the Rocky Mountain front, indicative of flow complication due to gradients in lithospheric thickness, and variations in amplitude through the central United States, which can be explained through varying contributions of lithospheric anisotropy. Thus, seismic anisotropy may be sourced in both the asthenosphere and lithosphere, and variations in splitting intensity are due to lithospheric anisotropy developed during deformation over long time scales.
DS201504-0202
2015
Howarth, G.H., Sobolev, N.V., Pernet-Fisher, J.F., Ketcham, R.A., Maisano, J.A., Pokhilenko, L.N., Taylor, D.3-D X-ray tomography of Diamondiferous mantle eclogite xenoliths, Siberia: a review.Journal of Asian Earth Sciences, Vol. 101, 1, pp. 39-67.RussiaDeposit - Udachnaya
DS201508-0359
2015
Howell, D., Fisher, D., Piazolo, S., Griffin, W.L., Sibley, S.J.Pink color in Type I diamonds: is deformation twinning the cause?American Mineralogist, Vol. 100, pp. 1518-1527.Australia, South America, VenezuelaDeposit - Argyle, Santa Elena
DS201511-1843
2015
Huang, J-H., Huang, F., Evans, L., Glasauer, S.Vanadium: global (bio)geochemistry.Chemical Geology, Vol. 417, pp. 68-89.MantleMineralogy

Abstract: Redox-sensitive transition group elements are involved in almost all fundamental geochemical processes. Of these elements, vanadium (V) contributes a particularly powerful tool to decipher the Earth's history and its link to extraterrestrial bodies. A comprehensive view of V includes the formation and interaction between the Earth's interior layers, the evolution of the Earth's surface to a habitable zone, biogeochemical cycling, and anthropogenic impacts on the environment. Tracing the geochemical behavior of V through the Earth's compartments reveals critical connections between almost all disciplines of Earth sciences. Vanadium has a history of application as a redox tracer to address the early accretion history of the Earth, to identify connections between the mantle and crust by subduction and melting, and to interpret past surface environments. The geochemical cycling of V from the deep Earth to the surface occurs through magmatism, weathering and digenesis, reflecting variations of fO2 and V species in different Earth compartments. Minerals form a link between deep Earth reservoirs of vanadium and surface environments, and the study of V in minerals has increased the understanding of V cycling. Finally, the exploitation of V has been increasing since the Industrial Revolution, and significant amounts of V have been released as a consequence into natural systems. Environmental concerns are promoting new areas of research to focus on V cycling between water, air, soil and sediment compartments. An increased understanding of V in all compartments, and knowledge of the processes that connect the compartments, is vital to tracing the fate of this intriguing element in natural systems.
DS201502-0063
2014
Huang, J-X., Li, P., Griffin, W.L., Xia, Q-K, Greau, Y., Pearson, N.J., O'Reilly, S.Y.Water contents of Roberts Victor xenolithic eclogites: primary and metasomatic controls.Contributions to Mineralogy and Petrology, Vol. 168, pp. 1092-1105.Africa, South AfricaDeposit - Roberts Victor
DS201502-0064
2015
Huang, L., Du, Y., Chen, G.GeoSegmenter: a statistically learned Chinese word segmenter for the geoscience domain.Computers & Geosciences, Vol. 76, pp. 11-17.TechnologyNot specific to diamonds
DS201506-0274
2015
Hudgins, T.R., Mukasa, S.B., Simon, A.C., Moore, G., Barifaijo, E.Melt inclusion evidence for CO2 rich melts beneath the western branch of the East African Rift: implications for long term storage of volatiles in the deep lithospheric mantle.Contributions to Mineralogy and Petrology, Vol. 169, 5p.Africa, East AfricaBasanites, Foidites
DM201506-0783
2015
Huffington PostOntario's only diamond mine and royalties paid in the province. VictorHuffington Post, May 14, 3p.Canada, OntarioNews item - De Beers
DS201505-0251
2015
Hwang, S-L., Shen, P., Chu, H-T., Yui, T-F., Lizuka, Y.Origin of rutile needles in star garnet and implications for interpreation of inclusion textures in ultrahigh pressure metamorphic rocks.Journal of Metamorphic Geology, Vol. Pp. 249-272.TechnologyUHP
DS201508-0360
2015
Hystad, G., Downs, R.T., Hazen, R.M.Mineral species frequency distribution conforms to a large number of rare events model: prediction of Earth's missing minerals.Mathematical Geosciences, Vol. 47, no. 6, pp. 647-661.TechnologyNot specific to diamonds but interesting reading!
DS201507-0316
2015
Ickert, R.B., Stachel, T., Stern, R.A., Harris, J.W.Extreme 18O-enrichment in majorite constrains a crustal origin of transition zone diamonds.Geochemical Perspectives Letters, 1, pp. 65-74.Africa, South AfricaDeposit - Jagersfontein
DS201505-0252
2015
ICMMEngaging with society - ICMM releases annual review 2014.ICMM, March, 14p. PdfGlobalCSR
DS201509-0400
2015
ICMMThe role of mining in Ghana's future.ICMM, July 72p.Africa, GhanaLegal
DS201512-1928
2015
ICMMGood practice guide to indigenous peoples and mining.ICMM , pdf. 138p.GlobalCSR
DS201503-0150
2015
ICMM, Raw Materials Group, Oxford Policy ManagementThe role of mining in national economies. 2nd editionICMM, Oct. 56p.GlobalEconomics
DM201503-0784
2015
Idex MagazineSo near yet so far … introduction to Zimbabwe diamond supplier.Idex Magazine, Feb. pp. 36-38.Africa, ZimbabweNews item - history
DM201503-0785
2015
Idex MagazineZimbabwe diamond industry.Idex Magazine, Feb. pp. 38-45.Africa, ZimbabweNews item - diamond industry
DM201503-0786
2015
Idex MagazineDiamond - sector objectives.Idex Magazine, Feb. pp. 46-51.Africa, ZimbabweNews item - legal
DM201503-0787
2015
Idex MagazineIs the Marange party over?Idex Magazine, Feb. pp. 52-61.Africa, ZimbabweNews item - Marange
DM201503-0788
2015
Idex MagazineA century of Zimbabwe diamond exploration.Idex Magazine, Feb. pp. 62-68.Africa, ZimbabweNews item - history
DM201504-0789
2015
Idex MagazineThe millennial generation.. Changing the way we buy. Idex Magazine, March, pp. 36-64.GlobalNews item - retail
DM201505-0790
2015
Idex MagazineFrom clicks to bricks - Blue Nile.Idex Magazine, Apr. pp. 38-45.GlobalNews item - Blue Nile
DM201505-0791
2015
Idex MagazineGet moving to mobile.Idex Magazine, Apr. pp. 46-55.GlobalNews item - online for consumers
DM201505-0792
2015
Idex MagazineFrom on-line to in-store: could click and collect be the next big thing?Idex Magazine, Apr. pp. 56-62.GlobalNews item - online for consumers
DM201507-0793
2015
Idex Magazine2014: the year of confidence lost.Idex Magazine, June pp. 38-43.GlobalNews item - markets
DM201507-0794
2015
Idex MagazineThe 2014 diamond pipeline.Idex Magazine, June pp. 44-66.GlobalNews item - pipeline
DM201509-0795
2015
Idex MagazineA splintering of the pipeline.. Publicity surrounding the Diamond Producers Association.Idex Magazine, Aug. pp. 36-45.GlobalNews item - pipeline
DM201509-0796
2015
Idex MagazineDanger of product substitution…Idex Magazine, Aug. pp. 46-53.TechnologyNews item - Lab grown
DM201509-0797
2015
Idex MagazineLab-grown diamonds increase bargaining power.Idex Magazine, Aug. pp. 54-66.TechnologyNews item - synthetics
DS201501-0015
2014
Idex MagazineReview of the year.Idex Magazine, No. 296, December pp. 36-66.GlobalIndustry - problems and highs and lows
DS201501-0016
2014
Idex MagazineIdex & AdAmiA .. Launch of diamond investment product.Idex Magazine, No. 296, December p. 21. ( 1p)GlobalAdAmia
DS201506-0275
2015
Idex MagazineThe missing gap, a bridge from gemology to reality.Idex Magazine, No. 301, pp. 118-119.TechnologyGemology
DS201512-1929
2015
Idex Magazine2015 Indian diamond industry Local pressures and global challenges.Idex Magazine, No. 307, pp. 34-36.IndiaEconomics
DS201512-1930
2015
Idex MagazineReturn to generalized system of preferences. IndiaIdex Magazine, No. 307, pp. 37-43.IndiaEconomics
DS201512-1931
2015
Idex MagazineRough price stability will return prosperity to the Indian diamond industry.Idex Magazine, No. 307, pp. 44-46.IndiaEconomics
DM201501-0798
2014
Idex MemoDull name, important task: generic marketing critical to industry's future.Idexonline.com, Dec. 4, 1p.GlobalNews item - markets
DM201501-0799
2014
Idex MemoGIA battling crimes: suspends duplicate report service to prevent fraud.Idexonline.com, Dec. 11, 2p.GlobalNews item - GIA
DM201501-0800
2014
Idex MemoLong path to recovery shows few signs of ending for Japan. Idexonline.com, Dec. 19, 2p.JapanNews item - economics
DM201502-0801
2014
Idex MemoYear end reflections: the 95 year struggle to secure rough for beneficiation.Idexonline.com, Dec. 25, 2p.Global, IndiaNews item - rough demand
DM201502-0802
2015
Idex MemoNew Year, old challenges. Idexonline.com, Jan. 1, 2p.GlobalNews item - demand
DM201502-0803
2015
Idex MemoTrue Luxe ways. Study on luxury brands and their best customers.Idexonline.com, Jan. 8, 1p.GlobalNews item - markets
DM201502-0804
2015
Idex MemoModern family…. Tiffany's ad campaign.Idexonline.com, Jan. 15, 2p.GlobalNews item - Tiffany
DM201502-0805
2015
Idex MemoA way with words… engagement marketingIdexonline.com, Jan. 22, 1p.TechnologyNews item - markets
DM201503-0806
2015
Idex MemoEconomics 101: a course on added value.Idexonline.com, Jan. 29, 2p.TechnologyNews item - economics
DM201503-0807
2015
Idex MemoSynthetic diamond producer creates trade representative body prohibits the use of the 'S'-word.Idexonline.com, Feb. 12, 8p.TechnologyNews item - synthetics
DM201503-0808
2015
Idex MemoToo much of a good thing? Re-used engagement rings.Idexonline.com, Feb. 19, 1p.GlobalNews items - engagements
DM201504-0809
2015
Idex MemoUndisclosed lab-grown diamonds strike again. SuratIdex Online, Feb. 26, 1p.IndiaNews item - synthetics
DM201504-0810
2015
Idex MemoIs it just history repeating itself? ( promotion)Idex Online, Mar. 12, 1p.GlobalNews item - promoters
DM201505-0811
2015
Idex MemoJust a little disruption… discusses DDI's approach and work to date.Idex Online, Apr. 2, 1p.GlobalNews item - DDI
DM201505-0812
2015
Idex MemoIf you have to pinpoint three factors from the diamond business affecting the retail world of fine jewelery, what would you pick?Idex Online, Apr. 9, 1p.GlobalNews item - jewellery
DM201505-0813
2015
Idex MemoGoing up or down: where are diamond prices really headed?Idexonline.com, Apr. 16, 1p.GlobalNews item - prices
DM201505-0843
2015
Idex MemoRocking the boat… Marques de Morais overview.Idex Online, Mar. 26, 1p.Africa, AngolaNews item - legal
DM201506-0814
2015
Idex MemoTaxing the Antwerp diamond industry into prosperity.IdexOnline, Apr. 23. 3p.Europe, BelgiumNews item - legal
DM201506-0815
2015
Idex MemoThe year the industry lost confidence in its future.IdexOnline, May 7, 3p.GlobalNews item - economics
DM201506-0816
2015
Idex MemoYet another deception … undisclosed treatment of gems masking the inherent colour.IdexOnline, May 14, 1p.TechnologyNews item - GIA
DM201506-0817
2015
Idex MemoWhen life gives you lemons.IdexOnline, May 21, 1p.TechnologyNews item - economics
DM201507-0818
2015
Idex MemoRetail jewelry prices down: demand down - where's the logic? Big picture issues and obstacles discussed.Idex Online, May 28, 1p.GlobalNews item - retail
DM201507-0819
2015
Idex MemoA tagline forever … De Beers ..Idexonline, June 11, 1p.GlobalNews item - De Beers
DM201507-0820
2015
Idex MemoAntwerp Lab discovers and reverses undisclosed temporary color: IGI's findings alarmingly similar to fraudulent treatements exposed by GIA.idexonline, DIB Vol. 30, no. 858, June 16, 6p.TechnologyNews item - treatments
DM201507-0821
2015
Idex MemoThe myth of marketing to millennials. ( their dollars are fickle)Idex Online, June 25, 1p.GlobalNews item - markets
DM201508-0822
2015
Idex MemoGemfields India film explores mystery of rubies.Idex online, July 14, 1/4p.Africa, MadagascarNews item - Gemfields
DM201508-0823
2015
Idex MemoNo hard times for good ideas. Idex online, July 16, 1p.GlobalNews item - marketing
DM201509-0824
2015
Idex MemoDe Beers does not feel the love ( commentary on Kilalea's report).Idex online, July 30, 1p.United StatesNews item - De Beers
DM201509-0825
2015
Idex MemoWhy duty free is the next big retail arena.Idex online, Aug. 6, 1p.GlobalNews item - duty free
DM201510-2041
2015
Idex MemoThe never-ending conflict ( diamonds).Idexonline, Aug. 27, 1p.Africa, Central African Republic, Sierra LeoneNews item - legal
DM201510-2042
2015
Idex MemoDon't try to hide…. Websites keep a record of all your previous purchases, interests, credit card statements etc etc.Idexonline, Sept. 17, 2p.TechnologyNews item - websites
DM201510-2043
2015
Idex MemoBetting on color…. Minion yellow.Idexonline, Sept. 24, 1p.TechnologyNews item - diamond colour
DM201511-2141
2015
Idex MemoIs banning lab-grown diamonds really a victory?Idex Online, Oct. 15, 1p.TechnologyNews item - synthetics
DM201511-2142
2015
Idex MemoShe who controls the purse strings…. Affluent women.. Marketing to them.Idex Online, Oct. 22, 1p.GlobalNews item - markets
DM201512-2249
2015
Idex MemoCall for a new generation of industry leadership.Idex Online, Oct. 29, 1p.GlobalNews item - economics
DM201512-2250
2015
Idex MemoShop until you drop on November 11 Singles Day .. ChinaIdex Memo, Nov. 11, 1p.ChinaNews item - markets
DM201502-0826
2014
Idex OnlineZimbabwe signs deal for polishing equipment with Indian firm Sahajanand Laser Technology Limited.Idexonline.com, Dec. 31, 1p.Africa, Zimbabwe, IndiaNews item - Zimbabwe Diamond Technology Centre
DM201502-0827
2015
Idex OnlineIndian trade bodies warn against mixing synthetics with natural diamonds.Idexonline.com, Jan. 8, 1/4p.IndiaNews item - GJEPC
DM201502-0828
2015
Idex OnlineMbada diamonds turns to riot police to calm worker protests.Idexonline.com, Jan. 8, 1/4p.Africa, ZimbabweNews item - Mbada
DM201502-0829
2015
Idex OnlineSouth African youths to learn diamond polishing in Surat.Idexonline.com, Jan. 12, 1/4p.IndiaNews item - polishing
DM201504-0830
2015
Idex OnlineIDE plan to help Turkey develop diamond industry.Idexonline.com, Mar. 22, 1/4p.Europe, TurkeyNews item - IDE
DM201505-0841
2015
Idex OnlineGemfields emerald production hits 9.9 million carats in Q3.Idexonline.com, Apr. 15, 1p.Africa, ZambiaNews item - Gemfields
DM201507-0831
2015
Idex OnlineDe Beers's rough diamond sales for beneficiation reaches $ 1.5 billion in 2014.Idex Online, June 2, 1/2p.GlobalNews item - De Beers
DM201507-0832
2015
Idex OnlineFatality reported in Kimberley Diamonds Lerala mine.Idexonline, June 11, 1/4p.Africa, BotswanaNews item - Kimberley Diamonds
DM201507-0833
2015
Idex OnlineTACY's 2014 Diamond Pipeline: the year the industry lost confidence in its future.Idex Online, June 11, 2p. ChartGlobalNews item - Diamond pipeline
DM201507-0844
2015
Idex OnlineDe Beers satisfied with new Namibian sales agreement.Idex Online, June 25, 1/4p.Africa, NamibiaNews tem - De Beers
DM201508-0834
2015
Idex OnlineSarine Technologies Galaxy System scans 10 millionth stone.Idex online, July 2, 1/4p.TechnologyNews item - Sarine
DM201508-0835
2015
Idex OnlineRio Tinto Diamonds has completed the sale of its two holdings in Zimbabwe. 78% interest in Murowa diamonds to RZ Murowa Holdings Limited ( Zimbabwean independent company)Idex online, July 3, 1p.Africa, ZimbabweNews item - Rio Tinto
DM201508-0836
2015
Idex OnlineWho wears the jewelry? ( women buying for themselves)Idex online, July 9, 1p.GlobalNews item - markets
DM201509-0837
2015
Idex OnlineRio Tinto diamond production +18 % in H1 2015.Idex Online, Aug. 6, 1/4p.GlobalNews item - Rio Tinto
DM201509-0838
2015
Idex OnlineResearchers discover 20+ potential diamond deposits in Indian state of Telgana. Mahbubnagar district.Idex Online, Aug. 11, 1/4p.IndiaNews item - Telgana
DM201509-0839
2015
Idex OnlineAlrosa releases 2014 social and environmental report.Idexonline.com, Aug. 27, 1/4p.RussiaNews item - Alrosa
DM201509-0840
2015
Idex OnlineThe government of Madhya Pradesh is planning to establish a Diamond Park Project in the commercial capital of Indore.Idexonline.com, Aug. 25, 1/2p.India, Madhya PradeshNews item - processing
DM201510-2044
2015
Idex OnlineThe Hatton Garden Safe Deposit - appointed liquidators for it.Idexonline, Aug. 28, 1p.Europe, United KingdomNews item - Hatton Garden Safe Deposit
DM201510-2045
2015
Idex OnlineAlrosa's Zharkov emphasizes need to stabilize market at EEF ( Eastern Economic Forum).Idexonline, Sept. 7, 1/2p.RussiaNews item - Alrosa
DM201510-2046
2015
Idex OnlineAlrosa to drop rough prices by 10% at September sight.Idexonline, Sept. 18, 1/4p.RussiaNews item - Alrosa
DM201510-2047
2015
Idex OnlineIdex online DEF responds to Time Magazine article ( Blood Diamonds). Open letter "Diamonds do Good".Idexonline, Sept. 13, 2p.GlobalNews item - Time Magazine
DM201511-2143
2015
Idex OnlineKDL secures another $ 2.2 million in debt finance. Lerala ( from Zhejiang Huitong Auction Co.)Idex Online, Oct. 12, 1/4p.Africa, BotswanaNews item - Kimberley Diamonds
DM201511-2144
2015
Idex OnlineAlrosa developing lab-grown diamond screening technology.Idex Online, Oct. 15, 1/2p.TechnologyNews item - synthetics
DM201512-2251
2015
Idex OnlineFusion/Hennig to tender 128 carat yellow diamond. Superkolong tailings plantIdex Online, Nov. 5, 1/4p.Africa, South AfricaNews item - Fusion/Hennig
DM201512-2252
2015
Idex OnlineAnglo American has made a number of changes …. De Beers Cleaver appointed group director - Strategy and Business development; Mostyn appointed executive head of Strategy and Corporate Affairs.Idex Online, Nov. 11, 1/4p.GlobalNews tem - Anglo American
DM201512-2253
2015
Idex OnlineBotswana Diamonds reports $ 512,000 operating loss for 2015.Idex Online, Nov. 19, 1/4p.Africa, BotswanaNews item - Botswana Diamonds
DS201507-0317
2015
Ignaov, P.A., Novikov, K.V., Shmonov, A.M., Razumov, A.N., Kilizhikov, O.K.Comparative analysis of ore bearing structures in Maiskoe, Markha and Ozernoe kimberlite bodies at the Nakyn field, Yakutia.Geology of Ore Deposits, Vol. 57, 2, pp. 111-117.RussiaDeposit - Nakyn
DS201506-0276
2015
Ignatov, P.A., Novikov, K.V., Shmonov, A.M., Razumov, A.N., Kilizhikov, O.K.Comparative analysis of ore-bearing structures in Maiskoe, Markha and Ozernoe kimberlite bodies at the Nakyn Field, Yakutia.Geology of Ore Deposits, Vol. 57, 2, pp. 111-117.RussiaDeposit - Nakyn
DM201503-0842
2015
IIa TechnologiesScientific luminaries see great potential for grown diamonds. Dr. MisraIia Technologies, Jan. 30, 1p.TechnologyNews item - IIa Technologies
DM201503-0845
2015
Investing in African Mining IndabaAs South Africa loses its mining lustre, these countries are waiting to pounce, and some of the region's biggest players. DR Congo, Angola, Rwanda, EndiamaInvesting in African Mining Indaba, Feb. 17, 3p.Africa, South AfricaNews item - review
DS201509-0401
2015
Ionov, D.A., Carlson, R.W., Doucet, L.S., Golovin, A.V., Oleinikov, O.B.The age and history of the lithospheric mantle of the Siberian craton: Re-Os and PGE study of peridotite xenoliths from the Obnazhennaya kimberlite.Earth and Planetary Science Letters, Vol. 428, pp. 108-119.Russia, SiberiaDeposit - Obnazhennaya

Abstract: The formation age of the lithospheric mantle of the Siberian craton (one of the largest on Earth) is not well established; nearly all published whole-rock Re–Os data are for mantle xenoliths from a single kimberlite in the center of the craton (Udachnaya). We report Re–Os isotope and PGE concentration data for 19 spinel and garnet peridotite xenoliths from the Obnazhennaya kimberlite in the northeastern portion of the craton. Most samples in this study, and many Obnazhennaya peridotites in general, show a combination of relatively low Al2O3 (0.1–2%) with high CaO (1.4–4%) concentrations. Only four dunites and harzburgites in our sample suite have low contents of both Al2O3 and CaO (0.1–0.8%), but their relatively low Mg# (0.888–0.919) and highly variable Os concentrations (0.6–35 ppb) suggest they may have formed in melt migration channels rather than as residues of partial melt extraction. A group of six Ca-rich (2.0–3.2% CaO) peridotites yields the highest Re–Os model ages (mean TRD = 2.8 Ga, mean TMA = 3.5 Ga). Eight peridotites with low to moderate Al2O3 (<2%) and Mg# ?0.91, including three low-Ca harzburgites, yield lower Re–Os model ages (mean TRD = 1.9 Ga, mean TMA = 2.2 Ga). The remainder of the samples may not yield meaningful TRD ages because they are not refractory (Al2O3 >2.6% and/or Mg# ?0.90). We interpret these results as evidence for a two-stage formation of the lithospheric mantle. The peridotites formed at the two stages show very similar chemical compositions. The enrichment in Ca, which we attribute to widespread post-melting metasomatism by carbonate-rich melts, may have taken place either at the end of the Archean melting event, when at least one Ca–Al-rich peridotite was formed, or later. The combined Re–Os age data on xenoliths from Obnazhennaya and Udachnaya suggest that the lithospheric mantle beneath the Siberian craton was not formed in a single event, but grew in at least two events, one in the late Archean and the other in the Paleoproterozoic. This study further indicates that the formation of highly melt-depleted lithospheric mantle was not limited to the Archean, but continued well into the Paleoproterozoic when the Siberian craton was stabilized.
DS201512-1932
2015
Isaenko, S.I., Shumilova, T.G., Shevchuk, S.S.Carbon matter in kimberlite rocks of the Charteskii Complex ( Subpolar Urals).Doklady Earth Sciences, Vol. 464, 2, pp. 1062-1065.RussiaCarbon

Abstract: Results of the study of carbon material (CM) discovered in kimberlite-like rocks of the Charteskii Complex (Subpolar Urals) are considered. It is shown that CM is represented by partially oxidized graphite and optically transparent amorphous CM (presumably diamond-like carbon). The data obtained are important for estimation of the diamond potential of this object, as well as for understanding of the new mechanism of the formation of diamond-like carbon and diamond.
DS201502-0065
2014
Isola, I., Mazzarini, F., Bonini, M., Cortiz, G.Spatial variability of volcanic features in early-stage rift settings: the case of the Tanzanian divergence, East African Rift.Terra Nova, Vol. 26, pp. 461-468.Africa, TanzaniaRifting, magmatism
DS201511-1844
2015
Ivanov, A.V.Why volatiles are required for cratonic flood basalt volcanism: two examples from the Siberian craton.Geological Society of America Special Paper, No. 514, pp. SPE514-19.Russia, SiberiaMagmatism

Abstract: The Siberian craton was affected by flood basalt volcanism at least twice during the Devonian (Yakutsk-Vilyui province) and Permian-Triassic (Siberian province) periods. In both cases volcanism appeared as brief pulses of flood basalt eruptions, followed by kimberlitic (and lamproitic) emplacement. Pressure estimations for the kimberlite-entrained mantle xenoliths reflect that the lithosphere was 190-230 km thick at the time of the Devonian flood basalt volcanism. Differently from Devonian kimberlites, the majority of Triassic kimberlites are diamond free, but at least one Triassic kimberlite pipe and some lamproites are diamondiferous, suggesting that the Siberian lithosphere remained thick during the Permian-Triassic flood basalt volcanic activity. If both the lithosphere and the asthenosphere were volatile poor, thick cratonic lithosphere prevented melting even at an elevated geotherm. During the Paleozoic, Siberia was surrounded by subduction systems. The water deep cycle in association with fast subduction and slab stagnation in the mantle transition zone is proposed to cause fluxing of the asthenosphere by water plus other fluids via wet diapir formation in the mantle transition zone. Such diapirs started to melt in the asthenosphere beneath thick cratonic lithosphere, producing voluminous melts. Mafic melts probably accumulated beneath cratonic lithosphere and rapidly erupted on the surface in response to stress-induced drainage events, as assumed for some other cratonic flood basalts.
DS201505-0242
2015
Jablon, M., Navon, O.The role of high density Micro inclusion fluids in the growth of monocrystalline diamonds.Israel Geological Society, Abstracts 1p.Africa, Guinea, South AfricaFibrous diamonds
DS201507-0318
2015
Jagoutz, O., Kelemen, P.B.Role of arc processes in the formation of continental crust.Annual Review of Earth and Planetary Sciences, Vol. 43, pp. 363-404.MantleMagmatism
DS201503-0151
2015
Jakubec, J., Johnson, M.The Jericho diamond mine - what happened?Vancouver Kimberlite Cluster, Feb. 20, 1p. AbstractCanada, NunavutDeposit - Jericho
DS201504-0203
2015
Janak, M., Froitzheim, N., Yoshida, K., Sasinkova, V., Nosko, M., Kobayashi,T., Hirajima, T., Vrabec, M.Diamond in metasedimentary crustal rocks from Pohorje, eastern Alps: a window to deep continental subductionJournal of Metamorphic Geology, Vol. 33, 5, pp. 495-512.Europe, SloveniaSubduction
DM201502-0846
2015
JCK onlineDe Beers CEO: we take new reports of undisclosed synthetics "very seriously". Mellier and need for marketing.JCKOnline.com, Jan. 13, 3p.GlobalNews item - De Beers
DM201503-0847
2015
JCK onlineAn anthropologist talks about why people want diamonds.JCKOnline.com, Jan. 30, 2p.GlobalNews item - markets
DM201504-0848
2015
JCK OnlineDiamond Intelligence Breifs changing format. … briefing with in depth stories 12 times or more a year. Elininating the weekly news briefs at back of the newsletter which are available from other sources.jckonline.com, Mar. 16, 1/2p.GlobalNews item - DIB
DS201511-1845
2015
Jellinek, A.M., Jackson, M.G.Connections between bulk composition, geodynamics and habitability of Earth.Nature Geoscience, Vol. 8, pp. 587-593.MantleGeodynamics

Abstract: The bulk composition of the silicate part of Earth has long been linked to chondritic meteorites. Ordinary chondrites — the most abundant meteorite class — are thought to represent planetary building materials. However, a landmark discovery showed that the 142Nd/144Nd ratio of the accessible parts of the modern terrestrial mantle on Earth is greater than that of ordinary chondrites. If Earth was derived from these precursors, mass balance requires that a missing reservoir with 142Nd/144Nd lower than ordinary chondrites was isolated from the accessible mantle within 20 to 30 million years of accretion. This reservoir would host the equivalent of the modern continents' budget of radioactive heat-producing elements (uranium, thorium and potassium), yet has not been discovered. We argue that this reservoir could have been lost to space by ablation from early impactors. If so, Earth's radiogenic heat generation is between 18 and 45% lower than estimates based on a chondritic composition. Calculations of Earth's thermal history that incorporate such reduced radiogenic heating are consistent with a transition to the current plate tectonic mode in the past 2.5 billion years or so, a late onset of the dynamo and an evolving rate of volcanic outgassing consistent with Earth's long-term habitable climate. Reduced heat production compared with Venus and Mars could also explain aspects of the differences between the current climatic regimes of these planets and Earth.
DS201512-1934
2015
Jenkins, J., Cottaar, S., White, R.S., Deuss, A.Depressed mantle discontinuities beneath Iceland: evidence of a garnet controlled 660 km discontinuity?Earth and Planetary Science Letters, Vol. 432, pp. 159-168.Europe, IcelandMantle plume

Abstract: The presence of a mantle plume beneath Iceland has long been hypothesised to explain its high volumes of crustal volcanism. Practical constraints in seismic tomography mean that thin, slow velocity anomalies representative of a mantle plume signature are difficult to image. However it is possible to infer the presence of temperature anomalies at depth from the effect they have on phase transitions in surrounding mantle material. Phase changes in the olivine component of mantle rocks are thought to be responsible for global mantle seismic discontinuities at 410 and 660 km depth, though exact depths are dependent on surrounding temperature conditions. This study uses P to S seismic wave conversions at mantle discontinuities to investigate variation in topography allowing inference of temperature anomalies within the transition zone. We employ a large data set from a wide range of seismic stations across the North Atlantic region and a dense network in Iceland, including over 100 stations run by the University of Cambridge. Data are used to create over 6000 receiver functions. These are converted from time to depth including 3D corrections for variations in crustal thickness and upper mantle velocity heterogeneities, and then stacked based on common conversion points. We find that both the 410 and 660 km discontinuities are depressed under Iceland compared to normal depths in the surrounding region. The depression of 30 km observed on the 410 km discontinuity could be artificially deepened by un-modelled slow anomalies in the correcting velocity model. Adding a slow velocity conduit of ?1.44% reduces the depression to 18 km; in this scenario both the velocity reduction and discontinuity topography reflect a temperature anomaly of 210 K. We find that much larger velocity reductions would be required to remove all depression on the 660 km discontinuity, and therefore correlated discontinuity depressions appear to be a robust feature of the data. While it is not possible to definitively rule out the possibility of uncorrected velocity anomalies causing the observed correlated topography we show that this is unlikely. Instead our preferred interpretation is that the 660 km discontinuity is controlled by a garnet phase transition described by a positive Clapeyron slope, such that depression of the 660 is representative of a hot anomaly at depth.
DS201503-0152
2015
Jensen, S.Diamonds beneath the Popigai crater - northern Russia.Denver Geophysical Society, The Record, No. 3, Feb. pp. 3-5.RussiaPopigai - rehash
DS201509-0403
2015
Jessell, M., Santoul, J., Baratoux, L., Youbi, N., Ernst, R.E., Metelka, V., Miller, J., Perrouty, S.An updated map of West African mafic dykes.Journal of African Earth Sciences, in press availableAfrica, West AfricaGeophysics - magnetics

Abstract: Studies of mafic dyke swarms may simultaneously provide information on the mechanical, geochemical, geochronological and magnetic environments at the time of their formation. The mafic intrusive history of different cratons can also be potentially used to unravel their assembly into their current configuration. The identification and classification of dykes is a first step to all these studies. Fortunately, even in regions with poor outcrop, we can use the strong magnetic response of mafic dykes to identify and map their extent. In West Africa the first maps of mafic dyke distribution were made over 40 years ago, but there are still large areas where there are almost no published data. In this paper we present a significantly updated map of mafic dykes for the West Africa Craton based in large part on new interpretations of the regional airborne magnetic database. This map includes the locations of over three thousand dykes across the craton, which locally shows several orientation clusters that provide a minimum estimate for the total number of dyke swarms in this region. Whilst we will have to wait until systematic dating of the different swarms is completed, we can demonstrate that there is a long and complex history of mafic magmatism across the craton, with up to 26 distinct dyke swarms mapped based according to their orientation. The mapping and dating of these swarms will provide key constraints on the assembly of the fragments that make up the modern continents.
DS201510-1773
2015
Jessell, M.W., Begg, G.C., Miller, M.S.The geophysical signatures of the West African Craton.Precambrian Research, in press available, 22p.Africa, West AfricaGeophysics - gravity

Abstract: This paper examines existing and newly compiled geophysical representations of the West African Craton (WAC) in terms of its large-scale tectonic architecture. In order to build an interpretation with a significant depth extent we draw upon a range of geophysical data, principally seismic tomographic inversions, receiver functions, gravity and magnetics. We present these results as a series of layers providing a series of depth slices though the cratonic lithosphere. The different geophysical methods suggest partitioning of the WAC into two tectonic elements at the largest scale which is observed in both seismic tomographic images, lithosphere-asthenosphere boundary (LAB) models and long wavelength gravity signals. The different models of the Moho, or crust-mantle boundary, based on these gravity or seismic datasets show little or no correlation, either for short or long-wavelength features, and show little correlation with new receiver function inferred crustal thickness estimates. Manual interpretation of low-wavelength gravity and magnetic data suggest a possible continuation of the WAC across the western margin of the modern boundary, and also highlight distinct domains interpreted to be of Birimian age.
DS201507-0319
2015
Jia, Y., Kerrich, R.N isotope composition of the primitive mantle compared to diamonds.Lithos, Vol. 233, pp. 131-138.MantleNitrogen - subduction
DS201509-0404
2015
Johnson, B., Goldblatt, C.The nitrogen budget of Earth.Earth Science Reviews, Vol. 148, pp. 150-173.MantleNitrogen

Abstract: We comprehensively compile and review N content in geologic materials to calculate a new N budget for Earth. Using analyses of rocks and minerals in conjunction with N–Ar geochemistry demonstrates that the Bulk Silicate Earth (BSE) contains ~ 7 ± 4 times present atmospheric N (4 × 1018 kg N, or PAN), with 27 ± 16 × 1018 kg N. Comparison to chondritic composition, after subtracting N sequestered into the core, yields a consistent result, with BSE N between 17 ± 13 × 1018 kg to 31 ± 24 × 1018 kg N. Embedded in the chondritic comparison we calculate a N mass in Earth's core (180 ± 110 to 30 ± 180 × 1018 kg) as well as present discussion of the Moon as a proxy for the early mantle. Significantly, our study indicates that the majority of the planetary budget of N is in the solid Earth. We suggest that the N estimate here precludes the need for a “missing N” reservoir. Nitrogen–Ar systematics in mantle rocks and primary melts identify the presence of two mantle reservoirs: MORB-source like (MSL) and high-N. High-N mantle is composed of young, N-rich material subducted from the surface and identified in OIB and some xenoliths. In contrast, MSL appears to be made of old material, though a component of subducted material is evident in this reservoir as well. Taking into account N mass and isotopic character of the atmosphere and BSE, we calculate a ?15N value of ~ 2%. This value should be used when discussing bulk Earth N isotope evolution. Additionally, our work indicates that all surface N could pass through the mantle over Earth history, and in fact the mantle may act as a long-term sink for N. Since N acts as a tracer of exchange between the atmosphere, oceans, and mantle over time, clarifying its distribution in the Earth is critical for evolutionary models concerned with Earth system evolution. We suggest that N be viewed in the same light as carbon: it has a fast, biologically mediated cycle which connects it to a slow, tectonically-controlled geologic cycle.
DS201511-1846
2012
Johnson, C.N., Stachel, T., Muehlenbachs, K., Stern, R.A., Armstrong, J.P.The micro/macro diamond relationship: a case study from the Artemisia kimberlite ( Northern Slave Craton) Canada.Lithos, Vol. 148, pp. 86-97. Available pdfCanada, Northwest TerritoriesMicrodiamonds - responses

Abstract: Size frequency distributions are the principal tool for predicting the macro-diamond grade of new kimberlite discoveries, based on micro-diamonds (i.e., diamond ? 0.5 mm) recovered from small exploration samples. Lognormal size frequency distributions – as observed for the Artemisia kimberlite (Slave Craton, Canada) – suggest a common source for micro- and macro-diamonds recovered from single samples, an implication that has never been conclusively tested. We analyzed 209 diamonds between 0.2 and 2 mm in size from the Artemisia kimberlite for their carbon isotopic compositions and nitrogen characteristics to determine the nature of the micro-/macro-diamond relationship.-Despite overall similarity in the ?13C distributions of micro- and macro-diamonds – both are bimodal with peaks in classes ? 5.0 to ? 4.5‰ and ? 3.5 to ? 3.0‰ – rare diamonds with ?13C between ? 14.2 and ? 24.5‰ of presumed eclogitic origin are restricted to macro-diamonds, whereas positive values are only observed for micro-diamonds. In addition, a shift in main mode and median value in ?13C of about +1‰ is observed for micro- relative to macro-diamonds. Fundamental differences between micro- and macro-diamonds at Artemisia were revealed through the analysis of nitrogen concentrations: 68% of micro-diamonds are Type II (“nitrogen free”) versus 21% of macro-diamonds, and only 19% of micro-diamonds have nitrogen contents > 100 atomic ppm versus 43% of macro-diamonds. Similarly, the presence of a detectable hydrogen related peak (at 3107 cm? 1) increases from 40% for micro-diamonds to 94% for macro-diamonds.-Previous studies on diamond populations from individual deposits have documented that single batches of ascending kimberlite or lamproite magma sample multiple diamond subpopulations formed during distinct growth events in compositionally variable sources and at various depth levels. The Artemisia data clearly show that even over a fairly narrow size interval, spanning the micro- to macro-diamond transition, the specific diamond subpopulations present and their relative proportions may vary significantly with diamond size. At Artemisia, we conclude that the observed lognormal size distribution is not a reflection of an entirely common origin of micro- and macro-diamonds.
DS201506-0277
2015
Johnson, M.L.Colour grading of synthetic moissanite.The Journal of Gemmology, Vol. 34, 5, pp. 384-385.TechnologyMoissanite
DS201510-1774
2015
Johnson, P., Moe, K.S., D'Haenens-Johansson, U., Rzhevskii, A.Discovery and distrbution of the [SI-V] defect in HPHT-grown gem quality diamonds.GSA Annual Meeting, Paper 300-12, 1p. Abstract only BoothTechnologySynthetic diamonds

Abstract: Defect of [Si-V]- is common in CVD synthetic diamonds, and its occurrence was also reported in some rare natural diamonds (Breeding and Wang, 2008). It is an important feature employed for gem diamond identification, and also has great potential for applications in industry. However little is known about how the silicon impurity gets into diamond lattice either in synthetic or natural diamonds. In this study, we discovered the occurrence of [Si-V]- in HPHT synthetic diamonds and the correlation between its precipitation and diamond growth sectors was successfully determined. Total 20 samples, HPHT grown diamond wafers from NDT (New Diamond Technology) were studied in addition to one type IIb HPHT synthetic diamond submitted to GIA Laboratory for grading. Distributions of defects in these samples were carefully mapped using infrared microscopy at room temperature and an imaging Raman microscope at liquid nitrogen temperature. Defect of [Si-V]- has doublet emissions at 736.6/736.9 nm (Clark et al., 1995), and can be effectively excited using 633 nm laser. Analyses were conducted at Liquid Nitrogen temperature as the detection of the Si related emissions peak is temperature dependent (Feng and Schwartz 1993). Additionally, the solvent catalysts used in the HPHT methods to grow synthetic diamond either intentionally or unintentionally contain nickel in varying quantities. Nickel impurity creates optical centers which emit a doublet peak at 882.6/884.3nm, and can be easily excited using 780 nm laser. The [SiV]- is clearly observed in only certain growth sectors of the synthetic crystal and the distribution is not homogeneous. By comparing the two acquired maps one acquired at 633nm excitation showing the [Si-V]- distribution and one acquired with 780nm excitation showing the nickel defect distribution, it was found that the [Si-V]- is confined to the same growth sector as Ni related defect with higher concentrations/intensity at the edges of these sectors. Since it is well known that the Ni defect is confined exclusively to the octahedral growth sectors {111} of diamond (Lawson et al., 1993), this study for the first time confirmed that [Si-V]- is confined to the {111} octahedral growth sectors. This new discovery leads to discussion as to the incorporation of silicon in diamond and the relationship to other impurities.
DS201511-1847
2015
Julian, B.R., Foulger, G.R., Hatfield, O., Jackson, S.E., Simpson, E., Einbeck, J., Moore, A.Hotspots in hindsight. Mentions kimberlitesGeological Society of America Special Paper, No. 514, pp. SPE514-08.MantleHotspots

Abstract: Thorne et al. (2004), Torsvik et al. (2010; 2006) and Burke et al. (2008) have suggested that the locations of melting anomalies ("hot spots") and the original locations of large igneous provinces ("LIPs") and kimberlite pipes, lie preferentially above the margins of two "large lower-mantle shear velocity provinces", or LLSVPs, near the bottom of the mantle, and that the geographical correlations have high confidence levels (> 99.9999%) (Burke et al., 2008, Fig. 5). They conclude that the LLSVP margins are "Plume-Generation Zones", and that deep-mantle plumes cause hot spots, LIPs, and kimberlites. This conclusion raises questions about what physical processes could be responsible, because, for example, the LLSVPs are apparently dense and not abnormally hot (Trampert et al., 2004). The supposed LIP-hot spot-LLSVP correlations probably are examples of the "Hindsight Heresy" (Acton, 1959), of performing a statistical test using the same data sample that led to the initial formulation of a hypothesis. In this process, an analyst will consider and reject many competing hypotheses, but will not adjust statistical assessments correspondingly. Furthermore, an analyst will test extreme deviations of the data, , but not take this fact into account. "Hindsight heresy" errors are particularly problematical in Earth science, where it often is impossible to conduct controlled experiments. For random locations on the globe, the number of points within a specified distance of a given curve follows a cumulative binomial distribution. We use this fact to test the statistical significance of the observed hot spot-LLSVP correlation using several hot-spot catalogs and mantle models. The results indicate that the actual confidence levels of the correlations are two or three orders of magnitude smaller than claimed. The tests also show that hot spots correlate well with presumably shallowly rooted features such as spreading plate boundaries. Nevertheless, the correlations are significant at confidence levels in excess of 99%. But this is confidence that the null hypothesis of random coincidence is wrong. It is not confidence about what hypothesis is correct. The correlations probably are symptoms of as-yet-unidentified processes.
DS201506-0278
2015
Justo, J.F., Morra, G., Yuen, D.A.Viscosity undulations in the lower mantle: the dynamical role of iron spin transition.Earth and Planetary Science Letters, Vol. 421, pp. 20-26.MantleCore
DS201503-0153
2014
Kaban, M.K., Mooney, W.D., Cloetingh, S.A.P.Density, temperature and composition of the North American lithosphere - new insights from a joint analysis of seismic, gravity and mineral physics data: 1. density structure of the crust and upper mantle.Geochemistry, Geophysics, Geosystems: G3, Vol. 15, 12, pp. 4781-4807.MantleGeophysics - seismic
DS201511-1848
2015
Kaban, M.K., Mooney, W.D., Petrunin, A.G.Cratonic root beneath North America shifted by basal drag from the convecting mantle.Nature Geoscience, Vol. 8, 10, pp. 797-800.United States, CanadaGeophysics - seismics

Abstract: Stable continental cratons are the oldest geologic features on the planet. They have survived 3.8 to 2.5 billion years of Earth’s evolution1, 2. The key to the preservation of cratons lies in their strong and thick lithospheric roots, which are neutrally or positively buoyant with respect to surrounding mantle3, 4. Most of these Archaean-aged cratonic roots are thought to have remained stable since their formation and to be too viscous to be affected by mantle convection2, 3, 5. Here we use a combination of gravity, topography, crustal structure and seismic tomography data to show that the deepest part of the craton root beneath the North American Superior Province has shifted about 850?km to the west-southwest relative to the centre of the craton. We use numerical model simulations to show that this shift could have been caused by basal drag induced by mantle flow, implying that mantle flow can alter craton structure. Our observations contradict the conventional view of cratons as static, non-evolving geologic features. We conclude that there could be significant interaction between deep continental roots and the convecting mantle.
DS201511-1849
2016
Kalashnikov, A.O., Yakovenchuk, V.N., Pakhomovsky, Y.A.A., Bazai, A.V., Sokharev, V.A., Konopleva, N.G., Mikhailova, J.A., Goryainov, P.M., Ivanyuk, G.Yu.Scandium of the Kovdor baddeleyite apatite magnetite deposit ( Murmansk region, Russia): mineralogy, spatial distribution, and potential source.Ore Geology Reviews, Vol. 72, pp. 532-537.RussiaCarbonatite
DS201502-0066
2015
Kalashnyk, A.Regularities of spatial association of major endogenous uranium deposits and kimberlitic dykes in the uranium ore regions of the Ukrainian Shield.Economic Geology Research Institute 2015, Vol. 17,, # 2872, 1p. AbstractRussia, UkraineKimberlite dykes
DS201511-1850
2015
Kaldos, R., Guzmics, T., Mitchell, R.H., Dawson, J.B., Milke, R., Szabo, C.A melt evolution model for Kerimasi volcano, Tanzania: evidence from carbonate melt inclusions in jacupirangite.Lithos, Vol. 238, pp. 101-119.Africa, TanzaniaCarbonatite

Abstract: This study presents compositional data for a statistically significant number (n=180) of heated and quenched (recreated) carbonate melt inclusions trapped in magnetite and clinopyroxene in jacupirangite from Kerimasi volcano (Tanzania). On the basis of homogenization experiments for clinopyroxene-hosted melt inclusions and forsterite-monticellite-calcite phase relations, a range of 1000 to 900 °C is estimated for their crystallization temperatures. Petrographic observations and geochemical data show that during jacupirangite crystallization, a CaO-rich and alkali-"poor" carbonate melt (relative to Oldoinyo Lengai natrocarbonatite) existed and was entrapped in the precipitating magnetite, forming primary melt inclusions, and was also enclosed in previously crystallized clinopyroxene as secondary melt inclusions. The composition of the trapped carbonate melts in magnetite and clinopyroxene are very similar to the parental melt of Kerimasi calciocarbonatite; i.e., enriched in Na2O, K2O, F, Cl and S, but depleted in SiO2 and P2O5 relative to carbonate melts entrapped at an earlier stage and higher temperature (1050-1100 °C) during the formation of Kerimasi afrikandite. Significant compositional variation is shown by the major minerals of Kerimasi plutonic rocks (afrikandite, jacupirangite and calciocarbonatite). Magnetite and clinopyroxene in the jacupirangite are typically transitional in composition between those of afrikandite and calciocarbonatite. These data suggest that the jacupirangite represents an intermediate stage between the formation of afrikandite and calciocarbonatite. Jacupirangite most probably formed when immiscible silicate and carbonate melts separated from the afrikandite body, although the carbonate melt was not separated completely from the silicate melt fraction. In general, during the evolution of the carbonate melt at Kerimasi, concentrations of P2O5 and SiO2 decreased, whereas volatile content (alkalis, S, F, Cl and H2O) increased. Volatiles were incorporated principally in nyerereite, shortite, burbankite, nahcolite and sulfohalite as identified by Raman spectrometry. These extremely unstable minerals cannot be found in the bulk rock, because of alteration by secondary processes. On the basis of these data, an evolutionary model is developed for Kerimasi plutonic rocks.
DS201505-0240
2015
Kalnins, L.M., Simons, F.J., Kirby, J.F., Wang, D.V., Olhede, S.C.On the robustness of estimates of mechanical anisotropy in the continental lithosphere: a North American case study and global reanalysis.Earth and Planetary Science Letters, Vol. 419, pp. 43-51.United States, CanadaTectonics
DS201509-0405
2015
Kamenetsky, V.S., Mitchell, R.H., Maas, R., Giuliani, A., Gaboury, D., Zhitova, L.Chlorine in mantle derived carbonatite melts revealed by halite in the St. Honore intrusion ( Quebec, Canada).Geology, Vol. 43, 8, pp. 687-690.Canada, QuebecCarbonatite

Abstract: Mantle-derived carbonatites are igneous rocks dominated by carbonate minerals. Intrusive carbonatites typically contain calcite and, less commonly, dolomite and siderite as the only carbonate minerals. In contrast, lavas erupted by the only active carbonatite volcano on Earth, Oldoinyo Lengai, Tanzania, are enriched in Na-rich carbonate phenocrysts (nyerereite and gregoryite) and Na-K halides in the groundmass. The apparent paradox between the compositions of intrusive and extrusive carbonatites has not been satisfactorily resolved. This study records the fortuitous preservation of halite in the intrusive dolomitic carbonatite of the St.-Honoré carbonatite complex (Québec, Canada), more than 490 m below the present surface. Halite occurs intergrown with, and included in, magmatic minerals typical of intrusive carbonatites; i.e., dolomite, calcite, apatite, rare earth element fluorocarbonates, pyrochlore, fluorite, and phlogopite. Halite is also a major daughter phase of melt inclusions hosted in early magmatic minerals, apatite and pyrochlore. The carbon isotope composition of dolomite (?13C = –5.2‰) and Sr-Nd isotope compositions of individual minerals (87Sr/86Sri = 0.70287 in apatite, to 0.70443 in halite; ?Nd = +3.2 to +4.0) indicate a mantle origin for the St.-Honoré carbonatite parental melt. More radiogenic Sr compositions of dolomite and dolomite-hosted halite and heavy oxygen isotope composition of dolomite (?18O = +23‰) suggest their formation at some time after magma emplacement by recrystallization of original magmatic components in the presence of ambient fluids. Our observations indicate that water-soluble chloride minerals, common in the modern natrocarbonatite lavas, can be significant but ephemeral components of intrusive carbonatite complexes. We therefore infer that the parental magmas that produce primary carbonatite melts might be enriched in Na and Cl. This conclusion affects existing models for mantle source compositions, melting scenarios, temperature, rheological properties, and crystallization path of carbonatite melts.
DS201506-0279
2015
Kamenetsky, V.S., Yaxley, G.M.Carbonate-silicate iquid immiscibility in the mantle propels kimberlite magma ascent.Geochimica et Cosmochimica Acta, Vol. 158, pp. 48-56.MantleCarbonatite, content of kimberlite melts
DS201510-1776
2015
Kamenetsky, V.S.,Park, J-W., Mungall, J.E., Pushkarev, E.V., Ivanov, A.V., Kamenetsky, M.B., Yaxley, G.M.Crystallization of platinum group minerals from silicate melts: evidence from Cr-spinel hosted inclusions in volcanic rocks.Geology, Vol. 43, 10, pp. 903-906.RussiaMeimechite

Abstract: The formation of platinum-group minerals (PGM) during magma differentiation has been suggested to be an important process in primitive magma evolution, but decisive textural evidence is difficult to obtain because PGM tend to be very small and very rare. We have investigated Cr-spinel phenocrysts from two oxidized magmas (Siberian meimechite and Vanuatu [Ambae Island] arc picrite) and one reduced magma (Uralian [Russia] ankaramite) for PGM inclusions and their platinum-group element (PGE) contents. We observed Os-Ir and Pt-Fe alloys entrapped as inclusions in Cr-spinel in all three suites of lava. The alloys may occur in association with PGE-bearing sulfides and co-trapped silicate melt. Cr-spinel crystals also contain measurable amounts of Os, Ir, Ru, and Rh, which are at concentrations 2×–100× higher than mantle values. Thermodynamic models indicate that the arc picrite and ankaramite melts were probably both saturated with the observed PGM phases, whereas the Os-Ir alloy grain observed in the meimechite is not in equilibrium with the “bulk” melt. Our results demonstrate that PGM (alloys and sulfides) occur as liquidus phases in primitive (unfractionated) melts at high temperature and at a variety of redox conditions, and that Cr-spinel is a significant host of PGE, either in the crystal structure or as PGM inclusions.
DS201511-1851
2015
Kaminsky, F., Matzel, J., Jacobsen, B., Hutcheon, I., Wirth, R.Isotopic fractionation of oxygen and carbin in decomposed lower-mantle inclusions in diamond. Rio Soriso Mineralogy and Petrology, DOI 10. 1007/s00710-015-0401-7South America, Brazil, Mato GrossoJuina area

Abstract: Two carbonatitic mineral assemblages, calcite + wollastonite and calcite + monticellite, which are encapsulated in two diamond grains from the Rio Soriso basin in the Juina area, Mato Grosso State, Brazil, were studied utilizing the NanoSIMS technique. The assemblages were formed as the result of the decomposition of the lower-mantle assemblage calcite + CaSi-perovskite + volatile during the course of the diamond ascent under pressure conditions from 15 to less than 0.8 GPa. The oxygen and carbon isotopic compositions of the studied minerals are inhomogeneous. They fractionated during the process of the decomposition of primary minerals to very varying values: ?18O from ?3.3 to +15.4?‰SMOW and ?13C from ?2.8 to +9.3?VPDB. These values significantly extend the mantle values for these elements in both isotopically-light and isotopically-heavy areas.
DS201504-0204
2015
Kaminsky, F.V., Ryabchikov, I.D., McCammon, C.A., Longo, M., Abakumov, A.M., Turner, S., Heidari, H.Oxidation potential in the Earth's lower mantle as recorded by ferropericlase inclusions in diamond.Earth and Planetary Science Letters, Vol. 417, pp. 49-56.South America, BrazilDeposit - Juina
DS201504-0205
2015
Kaminsky, F.V., Ryabchikov, I.D., Wirth, R.A primary natrocarbonatite association in the deep Earth.Mineralogy and Petrology, in press available 12p.South America, BrazilDeposit - Inclusions in Juina
DC201504-1504
2015
Karelian Diamond Resources plc.Discovery of potential new diamond source… kimberlite in Kuhmo area of eastern Finland.Karelian Diamond Resources, Mar. 20, 1p.Europe, FinlandNews item - press release
DC201507-1505
2015
Karelian Diamond Resources plc.Kimberlite intersected in five further pits in Kuhmo.Karelian Diamond Resources, June 10, 1p.Europe, FinlandNews item - press release
DC201508-1506
2015
Karelian Diamond Resources plc.Karelian Diamonds gets "excellent" chemistry results at Riihivaara. Kuhmo region.Karelian Diamond Resources Plc., July 1, 2p.Europe, FinlandNews item - press release
DS201509-0407
2014
Karfunkel, J., Hoover, D., Fernandes, A.F., Sgarbi, G.M.C., Kambrock, K., Oliviera, G.D.Diamonds from the Coromandel area, west Minas Gerais State, Brazil: an update and new dat a on surface sources and origin.Brazil Journal of Geology, Vol. 44, 2, pp. 325-338.South America, Brazil, Minas GeraisDeposit - Coromandel

Abstract: Important diamond deposits southeast of Coromandel and the local geology have been studied in an attempt to understand what surface source provided the stones. River gravels of Pleistocene to Recent age from this region have supplied most of Brazil’s large diamonds over 100 ct. The upper cretaceous Capacete Formation of the Mata da Corda Group, composed of mafic volcanoclastic, pyroclastic and epiclastic material, has been worked locally for diamonds, nevertheless considered non-economic. The authors present results of their study of a deactivated small mine, representing the first report with description and analyses of two gem diamonds washed from this material. Hundreds of kimberlites, discovered in the last half century in the region, are sterile or non-economic. We propose that the surface source of the diamonds is the Capacete “conglomerado”. The volume of this material is enormous representing a potential resource for large-scale mining. The authors suggest detailed studies of the volcanic facies of this unit focusing on the genesis, distribution and diamond content. As to the question concerning the origin of these diamondiferous pyroclastic rocks, the authors exclude the kimberlites and point towards the large Serra Negra and Salitre alkaline complexes which are considered the primary source for the pyroclastic units of the Mata da Corda Group. They propose that early eruptive phases of this alkaline complex brought diamonds from a mantle source to the surface, much as happens with traditional kimberlites, to explain the association of such huge carbonatite complexes and diamonds.
DS201509-0408
2015
Karfunkel, J., Hoover, D., Fernandes, A.F., Sgarbi, G.M.C., Oliviera, G.D., Walde, D., Michelfelder, G.Surface source of Coromandel diamonds ( Minas Gerais State) Brazil and their possible origin from the Serra Negra/Salitre Supervolcano.Neues Jahrbuch fur Geologie und Palaontologie , Vol. 277, 2, pp. 237-250.South America, Brazil, Minas GeraisDeposit - Coromandel

Abstract: The origin of diamonds in the Coromandel area has been an enigma for many years, in spite of high investment in conventional and high tech prospecting methods by major mining companies for over half a century. The authors review the history, and then discuss the two principal hypotheses to explain the source of these alluvial diamonds. After mapping the headwater region of one of the richest alluvial diamond rivers, the Santo Antônio do Bonito River, they reject both principal hypotheses and conclude that the surficial source can be only the Upper Cretaceous Capacete Formation, composed of pyroclastics and epiclastics. Based on geophysical data from the literature, combined with field observations the authors suggest that the largest alkaline complex, situated within the diamond producing area, the Serra Negra/Salitre Complex has been the primary source for those pyroclastics of the Capacete Formation and the diamonds. The plugs of this complex are 15-30 times deeper than average kimberlites and other alkaline complexes in the region, and its excess of volume of the intrusive is three orders of magnitude larger than a typical kimberlite. With an intrusive volume of over 1000 km3 the complex is suggested to be a possible supervolcano. This explains the vast areal distribution of the pyroclastics and diamonds. This new hypothesis has advantages and disadvantages, some of them discussed in the paper and leading to the conclusion that further research is needed.
DS201502-0067
2015
Kargin, A., Sazonova, L., Nosova, A., Kovalchuk, E., Minevrina, E.Metasomatic processes in the mantle beneath the Arkangelsk province, Russia: evidence from garnet in mantle peridotite xenoliths, Grib pipe.Economic Geology Research Institute 2015, Vol. 17,, # 748, 1p. AbstractRussia, Kola Peninsula, ArchangelDeposit - Grib
DS201505-0243
2015
Katzir, Y., Anenburg, M., Kaminchik, J., Segev, A., Blichert-Toft, J., Spicuzza, M.J., Valley, J.W.Garnet pyroxenites as markers of recurring extension and magmatism at the rifted margins of the Levant basin.Israel Geological Society, Abstracts 1p.Europe, Israel, Mt. CarmelPyroxenite
DS201509-0409
2015
Kaur, G., Mitchell, R.H.Mineralogy of the P-12 K-Ti-richterite diopside olivine lamproite from Wajrakarur, Andhra Pradesh, India: implications for subduction related magmatism in eastern India.Mineralogy and Petrology, In press available 23p.India, Andhra PradeshDeposit - P-12

Abstract: The P-12 "para-kimberlite" from Wajrakarur consists of forsteritic olivine, Al-Na-poor diopside, Fe-Ti-rich, Al-poor phlogopite, K-Ti-richterite, spinel, perovskite, cymrite, apatite, barite, Ba-Sr- bearing calcite, gittinsite, witherite, strontianite, and hydrogrossular (hydrogarnet). The rock also contains small clasts consisting dominantly of calcite, with lesser Ba-Sr-bearing calcite, cymrite, barite, strontianite, witherite, apatite, and hydrogrossular. Two generations of forsteritic olivine (Fo80-93) crystals are present: common phenocrystal-to-microphenocrystal; and rare anhedral macrocrystic olivines. Phlogopite occurs as microphenocrysts and as groundmass poikilitic plates with inclusions of spinel, perovskite, apatite, and chlorite pseudomorphs (after pyroxene). Phlogopites also occur as reaction rims around olivine crystals. The phlogopites have extremely low Al2O3 (2.2-3.8 wt.%), moderate-to-high FeO (6.9-16 wt.%), TiO2(1.9-4.6 wt.%), and Na2O (0.4-2.7 wt.%) contents and are enriched in fluorine (up to 6.0 wt.%) and considered to be tetraferriphlogopite. The pyroxenes occur in five parageneses as: (1) phenocrysts and microphenocrysts; (2) small slender crystals(<30 µm) forming part of the groundmass; (3) the cores of richterite crystals; (4) reaction products replacing earlier-formed olivine; (5) acicular crystals mantling carbonate clasts. These pyroxenes do not differ significantly in composition and are all diopsides with minor variation in their TiO2, Al2O3, Na2O contents. Titanian-potassium richterite commonly occurs as: (1) groundmass poikilitic plates; (2) small prismatic crystals (<30 µm); (3) reaction rims on olivine and pyroxene crystals. Groundmass poikilitic richterites commonly enclose pyroxene and apatite. Perovskites have a bimodal size distribution. Small (<20 µm) euhedral perovskites are scattered throughout the groundmass, whereas larger (100-300 µm) subhedral-to-euhedral perovskites are patchily-zoned and commonly broken. Micro-clasts consisting of accumulations of perovskite with phlogopite and apatite are also present. Spinels occur as large atoll crystals and small (<20 µm), euhedral-to-subhedral crystals, scattered throughout the groundmass. Some small spinel crystals are also present in the rims of olivine and pyroxene crystals. Atoll spinels are up to 100 µm in size, commonly with single and double cores. Atoll spinels are typically associated with perovskites. The euhedral-to-subhedral small spinels are ulvospinels. The atoll spinels have cores of titanian aluminous magnesiochromite with rims of magnesian titaniferous magnetite. The spinels have compositions which evolve along the lamproite-spinel compositional trend. Zoned calcite crystals occur as residual phases. Late stage residual calcite and carbonate clasts host prismatic cymrite crystals which are interpreted as pseudomorphs after potassium feldspar and/or barite. Subhedral-to-euhedral gittinsite and its Sr-analog are reported for the first time from the groundmass carbonate-chlorite mesostasis of a lamproite. Square-to-rectangular crystals of cymrite and hydrogrossular occur in the carbonate clasts and groundmass material. Barite anhedra commonly occur in the carbonate clasts together with witherite, strontianite, and Ba-Sr-bearing calcite. The texture and compositions of olivine, phlogopite, spinel, and K-Ti-richterite, together with the presence of cymrite pseudomorphs, possibly after potassium feldspar, demonstrate that this intrusion is a bona fide olivine lamproite and not a kimberlite. It is postulated that this, and other lamproites, located adjacent to the Eastern Ghats Mobile Belt, are derived by extensional decompressional melting of ancient subduction zones underlying the cratonic regions.
DC201501-1507
2014
Kennady Diamonds Inc.Kennady Diamonds intersects kimberlite at Kelvin.Kennady Diamonds Inc., Dec. 16, 1p.Canada, Northwest TerritoriesNews item - press release
DC201502-1508
2014
Kennady Diamonds Inc.Kennady Diamonds announces Kelvin mini-bulk sample grade of 2.59 carats per tonne. Kennady Diamonds Inc., Dec. 24, 1p.Canada, Northwest TerritoriesNews item - press release
DC201503-1509
2015
Kennady Diamonds Inc.Kennady Diamonds announces Kelvin exploration results. Kennady Diamonds Inc., Jan. 26, 2p.Canada, Northwest TerritoriesNews item - press release
DC201503-1510
2015
Kennady Diamonds Inc.Kennady Diamonds intercepts kimberlite at Kelvin.Kennady Diamonds Inc., Feb. 2, 1p.Canada, Northwest TerritoriesNews item - press release
DC201503-1511
2015
Kennady Diamonds Inc.Kennady Diamonds intercepts 54.5 meters of kimberlite at Kelvin.Kennady Diamonds Inc., Feb. 12, 2p.Canada, Northwest TerritoriesNews item - press release
DC201503-1512
2015
Kennady Diamonds Inc.Dermot Desmond backed diamond explorer a mine ' within five years'. KelvinKennady Diamonds Inc., Feb. 10, 1/4p.Canada, Northwest TerritoriesNews item - press release
DC201503-1513
2015
Kennady Diamonds Inc.Kennady Diamonds closes first tranche of C$20 million non-brokered private placement.Kennady Diamonds Inc., Feb. 19, 1p.Canada, Northwest TerritoriesNews item - press release
DC201504-1514
2015
Kennady Diamonds Inc.Kennady Diamonds intersects 80 meters of kimberlite at Kelvin.Kennady Diamonds Inc., Feb. 24, 3p.Canada, Northwest TerritoriesNews item - press release
DC201504-1515
2015
Kennady Diamonds Inc.Kennady Diamonds closes second tranche of $ C 20 million non-brokered private placement.Kennady Diamonds Inc., Feb. 25, 1p.Canada, Northwest TerritoriesNews item - press release
DC201504-1516
2015
Kennady Diamonds Inc.Kennady Diamond closes final tranche of non-brokered private placement.Kennady Diamonds Inc., Mar. 10, 1p.Canada, Northwest TerritoriesNews item - press release
DC201504-1517
2015
Kennady Diamonds Inc.Kennady Diamonds intersects kimberlite at Faraday.Kennady Diamonds Inc., Mar. 18, 2p.Canada, Northwest TerritoriesNews item - press release
DC201504-1518
2015
Kennady Diamonds Inc.Kennady Diamonds intersects 37 meters of kimberlite at Faraday.Kennady Diamonds Inc., Mar. 24, 2p.Canada, Northwest TerritoriesNews item - press release
DC201505-1519
2015
Kennady Diamonds Inc.Kennady Diamonds extends strike of Faraday and intersects 52 meters of kimberlite.Kennady Diamonds Inc., Mar. 30, 4p.Canada, Northwest TerritoriesNews item - press release
DC201505-1520
2015
Kennady Diamonds Inc.Kennady Diamonds recovers 436 tonne Kelvin bulk sample: intersects 76 meters of kimberlite at Faraday.Kennady Diamonds Inc., Apr. 9, 2p.Canada, Northwest TerritoriesNews item - press release
DC201505-1521
2015
Kennady Diamonds Inc.Kennady Diamonds updates Kennady North drill program.Kennady Diamonds Inc., Apr. 20, 3p.Canada, Northwest TerritoriesNews item - press release
DC201505-1522
2015
Kennady Diamonds Inc.Kennady Diamonds announces Kelvin diamonds recovery results. Kennady Diamonds Inc., Apr. 23, 2p.Canada, Northwest TerritoriesNews item - press release
DC201506-1523
2015
Kennady Diamonds Inc.Kennady Diamonds updates Kennady North drill program.Kennady Diamonds Inc., May 1, 1p.Canada, Northwest TerritoriesNews item - press release
DC201506-1524
2015
Kennady Diamonds Inc.Kennady Diamonds intersects 73 meters of kimberlite at Faraday 2. Kennday NorthKennady Diamonds Inc., May 19, 3p.Canada, Northwest TerritoriesNews item - press release
DC201506-1525
2015
Kennady Diamonds Inc.Kennady Diamonds drills 194 meters of kimberlite at Kelvin.Kennady Diamonds Inc., May 27, 2p.Canada, Northwest TerritoriesNews item - press release
DC201507-1526
2015
Kennady Diamonds Inc.Kennady Diamonds drills 178 meters of kimberlite at Kelvin.. North lobe.Kennady Diamonds Inc., June 4, 3p.Canada, Northwest TerritoriesNews item - press release
DC201507-1527
2015
Kennady Diamonds Inc.Kennady Diamonds drills 159 meters of kimberlite at Kelvin.Kennady Diamonds Inc., June 11, 2p.Canada, Northwest TerritoriesNews item - press release
DC201507-1528
2015
Kennady Diamonds Inc.Kennady Diamonds drills 46 meters of kimberlite at Faraday 2.Kennady Diamonds Inc., June 16, 2p.Canada, Northwest TerritoriesNews item - press release
DC201507-1529
2015
Kennady Diamonds Inc.Kennady Diamonds drills 156 meters of kimberlite at Kelvin and 51 meters of kimberlite at Faraday 2.Kennady Diamonds Inc., June 25, 3p.Canada, Northwest TerritoriesNews item - press release
DC201508-1530
2015
Kennady Diamonds Inc.Kennady Diamonds updates Kennady North drill program.Kennady Diamonds Inc., July 13, 2p.Canada, Northwest TerritoriesNews item - press release
DC201508-1531
2015
Kennady Diamonds Inc.Kennady Diamonds announces Faraday 2 diamond recovery results.Kennady Diamonds Inc., July 15, 3p.Canada, Northwest TerritoriesNews item - press release
DC201508-1532
2015
Kennady Diamonds Inc.Kennady Diamonds finds Faraday 2 diamond during core logging. Kennady Diamonds Inc., July 16, 1p.Canada, Northwest TerritoriesNews item - press release
DC201508-1533
2015
Kennady Diamonds Inc.Kennady Diamonds drills 92 meters of kimberlite at Kelvin.Kennady Diamonds Inc., July 23, 1p.Canada, Northwest TerritoriesNews item - press release
DC201509-1534
2015
Kennady Diamonds Inc.Kennady Diamonds announces C$4 M non-brokered private placement. KelvinKennady Diamonds Inc., July 29, 1p.Canada, Northwest TerritoriesNews item - press release
DC201509-1535
2015
Kennady Diamonds Inc.Kennady Diamonds closes C$4 million non-brokered private placement. KelvinKennady Diamonds Inc., Aug. 12, 1p.Canada, Northwest TerritoriesNews item - press release
DC201509-1536
2015
Kennady Diamonds Inc.Provides Kennady North project update and exploration of the MZ kimberlite.Kennady Diamonds Inc., Aug. 17, 2p.Canada, Northwest TerritoriesNews item - press release
DC201509-1537
2015
Kennady Diamonds Inc.Kennady Diamonds annnounces Kelvin bulk sample diamond recovery results.Kennady Diamonds Inc., Aug. 26, 3p.Canada, Northwest TerritoriesNews item - press release
DC201510-2349
2015
Kennady Diamonds Inc.Kennady Diamonds updates Kennady North drilling.Kennady Diamonds Inc., Aug. 31, 3p.Canada, Northwest TerritoriesNews item - press release
DC201510-2350
2015
Kennady Diamonds Inc.Kennady Diamonds announces C$48 million private placement.Kennady Diamonds Inc., Sept. 16, 1p.Canada, Northwest TerritoriesNews item - press release
DC201510-2351
2015
Kennady Diamonds Inc.Kennady Diamonds updates Kennady North drilling. KelvinKennady Diamonds Inc., Sept. 21, 2p.Canada, Northwest TerritoriesNews item - press release
DC201511-2386
2015
Kennady Diamonds Inc.Kennady Diamonds closes first tranche of C$48 million non-brokered private placement ( Kelvin, Faraday, MZ and Doyle)Kennady Diamonds Inc., Oct. 1, 2p.Canada, Northwest TerritoriesNews item - press release
DC201511-2387
2015
Kennady Diamonds Inc.Kennady Diamonds announces Kelvin North sample grade of 2.6 carats per tonne.Kennady Diamonds Inc., Oct. 5, 3p.Canada, Northwest TerritoriesNews item - press release
DC201511-2388
2015
Kennady Diamonds Inc.Kennady Diamonds closes final tranche of $ 48 million non-brokered private placement North project.Kennady Diamonds Inc., Oct. 8, 1p.Canada, Northwest TerritoriesNews item - press release
DC201511-2389
2015
Kennady Diamonds Inc.Mr. Dermot Desmond announces further investment in Kennady Diamonds Inc. ( 23.6%)Kennady Diamonds Inc., Oct. 9, 1p.Canada, Northwest TerritoriesNews item - press release
DC201512-2435
2015
Kennady Diamonds Inc.Kennady Diamonds updates Kennady North drilling.Kennady Diamonds Inc., Oct. 28, 3p.Canada, Northwest TerritoriesNews item - press release
DC201512-2436
2015
Kennady Diamonds Inc.Kennady Diamonds announces Kelvin North sample grade of 2.53 carats per tonne.Kennady Diamonds Inc., Nov. 19, 4p.Canada, Northwest TerritoriesNews item - press release
DS201511-1852
2015
Kennett, B.L.N.Lithosphere-asthenosphere P wave reflectivity across Australia.Earth and Planetary Science Letters, Vol. 431, pp. 225-235.AustraliaGeophysics - seismics - cratons

Abstract: A direct image of P-wave reflectivity in the lithosphere and asthenosphere beneath seismic stations is extracted from stacked autocorrelograms of continuous component records. The autocorrelograms emphasise near vertically travelling waves, so that multiples are more muted than in receiver function studies and it is possible to work at higher frequencies than for receiver functions. Across a wide range of geological environments in Australia, in the 0.5-4.0 Hz frequency band, distinct reflections are seen in the crust underlain by weaker reflectivity in the lithosphere and asthenosphere. The base of crustal reflectivity fits well with Moho estimates from other classes of information. Few mantle reflectors have been seen in conventional reflection profiling at frequencies above 10 Hz; the presence of reflections in the 0.5-4.0 Hz band suggests variations on vertical scales of a few hundred metres with amplitudes of the order of 1%. There are slight indications of a change of reflection character in the lower part of the lithosphere in the transition to the asthenosphere. At a few stations there is a very clear lamination at asthenospheric depth, as well as reflections from the base of the S wave low velocity zone. Reflection bands often occur at depths where discontinuities have been inferred from S wave receiver function work at the same station, but would not by themselves be distinctive of a mid-lithosphere discontinuity.
DS201506-0281
2015
Kent, D.V., Kjarsgaard, B.A., Gee, J.S., Muttoni, G., Heaman, L.M.Tracking the Late Jurassic apparent ( or true) polar shift in U-Pb-dated kimberlites from cratonic North America ( Superior Province of Canada).Geochemistry, Geophysics, Geosystems: G3, Vol. 16, 4, pp. 983-994.Canada, Ontario, TimiskamingDeposit - Peddie
DS201502-0068
2015
Khokhryakov, A.F., Nechaev, D.V.Typomorphic featues of graphite inclusions in diamond: experimental data.Russian Geology and Geophysics, Vol. 56, 1-2, pp. 232-238.TechnologyDiamond inclusions
DS201508-0361
2015
Khokhryakov, A.F., Palyanov, Y.N.Effect of crystal defects on diamond morphology during dissolution in the mantle.American Mineralogist, Vol. 100, pp. 1528-1532.TechnologyDiamond morphology
DM201503-0849
2015
Kilalea, DDominion Diamond Corp Jay - a medium term jewel for DDC.RBC Capital Markets, Jan. 27, 7p.Canada, Northwest TerritoriesNews item - Dominion
DM201503-0850
2015
Kilalea, DPetra Diamonds Ltd. H1 IMS: near term pain ahead of grade delivery; but dividends starting.RBC Capital Markets, Jan. 26, 11p.Africa, South AfricaNews item - Petra
DM201503-0851
2015
Kilalea, DGem Diamonds Limited .. Tough rough conditions weigh…Letseng and Ghaghoo RBC Capital Markets, Jan. 28, 11p.Africa, Botswana, LesothoNews item - Gem Diamonds
DM201503-0852
2015
Kilalea, DAlrosa Ao Political backdrop and currency weigh.RBC Capital Markets, Jan. 29, 11p.RussiaNews item - Alrosa
DC201509-1541
2015
Kilalea, D.Anglo American plc. Dark side of the moon. Challenges.RBC Capital Markets, Aug. 4, 16p.GlobalNews item - Anglo
DM201501-0853
2014
Kilalea, D.RBC Diamond Digest: push and pull between diamantaires and miners on prices to continue in 2015.RBC Capital Markets, Dec. 9, 38p.GlobalNews item - review rough prices
DM201501-0854
2014
Kilalea, D.Dominion Diamond Corporation.. Positive Q3 with balance sheet and dividend focus.RBC Capital Markets, Dec. 12, 7p.Canada, Northwest TerritoriesNews item - Dominion
DM201502-0855
2014
Kilalea, D.Stornoway Diamond Corp. NAV discount offers attractive entry point. Positive RBC Capital Markets, Dec. 18, 7p.Canada, QuebecNews item - Stornoway
DM201502-0856
2014
Kilalea, D.Lucara looks to divest Mothae to focus on better opportunities. PositiveRBC Capital Markets, Dec. 18, 1/4p.Africa, LesothoNews item - Lucara
DM201502-0857
2015
Kilalea, D.Firestone Diamonds plc. Initiating coverage: a new diamond mine in Lesotho.RBC Capital Markets, Jan. 21, 20p.Africa, LesothoNews item - Firestone
DM201502-0858
2015
Kilalea, D.Petra Diamonds Ltd. H1 IMS: near term pain ahead of grade delivery but dividends starting.RBC Capital Markets, Jan. 26, 9p.Africa, South AfricaNews item - Petra
DM201502-0859
2015
Kilalea, D.RBC Diamond digest .. A difficult market for 2015, De Beers stepping up to the plate, bank debt still a concern, currency issues.RBC Capital Markets, Jan. 26, 18p.GlobalNews item - overview for 2015
DM201504-2467
2015
Kilalea, D.The start of a new funding formula…. RBC Capital Markets , Mar. 5, 6p.GlobalNews item - prices, banks
DM201504-2468
2015
Kilalea, D.Rerating driven by improving quality of diamond miners, not rising rough prices.RBC Capital Markets , Mar. 25, 16p.GlobalNews item - overview of diamond companies
DM201504-2479
2015
Kilalea, D.RBC diamond conference feedback. .. Strong sector… marketing concernsRBC Capital Markets , Mar. 6, 10p.GlobalNews item - robust sector
DM201505-0860
2015
Kilalea, D.De Beers finds conditions tough in March.RBC Capital Markets, Mar. 31, 2p.GlobalNews item - De Beers
DM201505-0861
2015
Kilalea, D.Dominion Diamond Corp. Q4 EPS misses on FX, otherwise robust.RBC Capital Markets, Apr. 9, 7p.Canada, Northwest TerritoriesNews item - Dominion
DM201505-0862
2015
Kilalea, D.ABN AMRO exits Indian loan book to a local bank.RBC Capital Markets, Apr. 10, 1/4p.IndiaNews item - ABN Amro
DM201505-0863
2015
Kilalea, D.Large stones pick up again with a 342 ct high colour gem recovered at Karowe.RBC Capital Markets, Apr. 21, 1p.Africa, BotswanaNews item - Lucara
DM201505-0864
2015
Kilalea, D.Petra Diamonds Ltd. Balance sheet strengthened and value adding new Culli nan plant.RBC Capital Markets, Apr. 24, 12p.Africa, South AfricaNews item - Petra
DM201505-0865
2015
Kilalea, D.Lucara Diamonds - large stones pick up again with 342 ct high colour gem recovered at Karowe.RBC Capital Markets, Apr. 24, 1/2p.Africa, BotswanaNews item - Lucara
DM201506-0866
2015
Kilalea, D.Stornoway broadening the equity register.RBC Capital Markets, May 1, 1/2p.Canada, QuebecNews item - Stornoway
DM201506-0867
2015
Kilalea, D.Lucara Diamond Corporation enters into agreement with Paragon Diamonds for the sale of Mothae.RBC Capital Markets, May 5, 1p.Africa, LesothoNews item - Lucara
DM201506-0868
2015
Kilalea, D.Lucara Diamond Corp. Q1 weaker than RBC driven by top line; guidance unchanged. KaroweRBC Capital Markets, May, 13, 8p.Africa, BotswanaNews item - Lucara
DM201506-0869
2015
Kilalea, D.Petra Diamonds Ltd. Putting focus on the new plant. CullinanRBC Capital Markets, May 15, 8p.Africa, South AfricaNews item - Petra
DM201506-0870
2015
Kilalea, D.Polished picks up but rough lags as summer begins.RBC Capital Markets, May 27, 18p.GlobalNews item - markets
DM201507-0871
2015
Kilalea, D.Dominion Diamond Corp. Q1 Preview - a tough quarter with pressure on margins.RBC Capital Markets, June 3, 6p.Canada, Northwest TerritoriesNews item - press release
DM201507-0872
2015
Kilalea, D.Firestone Diamonds plc. Delays and some capex creep at Liqhobong.RBC Capital Markets, June 23, 4p.Africa, LesothoNews item - Firestone
DM201508-0873
2015
Kilalea, D.RBC Diamond Digest.. Through the glass darkly.RBC Capital Markets, July , 17p.GlobalNews item - markets
DM201508-0874
2015
Kilalea, D.Alrosa Ao Q2 production a little weaker than forecast.RBC Capital Markets, July 21, 7p.RussiaNews item - Alrosa
DM201508-0875
2015
Kilalea, D.Diamond digest: Buyers rebel against high rough prices. DTCRBC Capital Markets, July 22, 4p.GlobalNews item - De Beers
DM201508-0876
2015
Kilalea, D.Petra Diamonds : Q4 production and new guidance.RBC Capital Markets, July 27, 10p.Africa, South AfricaNews item - Petra
DM201509-0877
2015
Kilalea, D.Lucara Diamond Corporation.Good Q2 revenue drives a beat in H1. KaroweRBC Capital Markets, Aug. 12, 4p.Africa, BotswanaNews item - Lucara
DM201509-0878
2015
Kilalea, D.Lucara Diamond Corporation. Lower sales guidance impacts on rating. KaroweRBC Capital Markets, Aug. 13, 7p.Africa, BotswanaNews item - Lucara
DM201509-0879
2015
Kilalea, D.Lucara Diamond Corp. Another bounty of sparkling nuggets. KaroweRBC Capital Markets, Aug. 18, 4p.Africa, BotswanaNews item - Lucara
DM201509-0880
2015
Kilalea, D.Gem Diamonds Limited H1 results a beat driven by costs. Letseng GhaghooRBC Capital Markets, Aug. 19, 2p.Africa, Lesotho, BotswanaNews item - Gem Diamonds
DM201509-0881
2015
Kilalea, D.Stornoway Diamond Corp. On track and getting closer to production. RenardRBC Capital Markets, Aug. 19, 11p.Canada, QuebecNews item - Stornoway
DM201509-0882
2015
Kilalea, D.Gem Diamonds Limited Waiting on Ghaghoo.RBC Capital Markets, Aug. 20, 5p.Africa, BotswanaNews item - Gem Diamonds
DM201509-0883
2015
Kilalea, D.Dominion Diamond Corporation. Ekati plant changes start delivering. Our view: a good quarter from an efficiency perspective, we expect more to come.RBC Capital Markets, Aug. 21, 5p.Canada, Northwest TerritoriesNews item - Dominion
DM201509-0884
2015
Kilalea, D.Anglo American plc. De Beers reported to have lowered prices 7-10%.RBC Capital Markets, Aug. 24, 4p.GlobalNews item - De Beers
DM201509-0885
2015
Kilalea, D.Kimberley dat a show price weakness for 2014; this year should fall more.RBC Capital Markets, Aug. 25, 5p.GlobalNews item - prices
DM201510-2048
2015
Kilalea, D.The investment case fades for a while.RBC Capital Markets, Diamond Digest, Sept. 7, 18p.GlobalNews item - prices, supply, demand
DM201510-2049
2015
Kilalea, D.Dominion Diamond Corp. Q2 a miss driven by one off factors; inventory builds.RBC Capital Markets, Sept. 11, 4p.Canada, Northwest TerritoriesNews item - Dominion
DM201510-2050
2015
Kilalea, D.Dominion Diamond Corp. Q2 a miss driven by one off factors; inventory builds. Adjusting model.RBC Capital Markets, Sept. 14, 5p.Canada, Northwest TerritoriesNews item - Dominion
DM201510-2051
2015
Kilalea, D.Gem fetches $ 19 m for 357ct white stone in Antwerp.RBC Capital Markets, Sept. 14, 1p.Africa, LesothoNews item - Gem Diamonds
DM201510-2052
2015
Kilalea, D.Petra Diamonds Ltd. Rough pricing is the key to near-term risk.RBC Capital Markets, Sept. 18, 4p.Africa, South AfricaNews item - Petra
DM201510-2053
2015
Kilalea, D.Global diamond jewellery growth projected at 3 % in USD terms by De Beers - but less rough forecast to be sold. RBC Capital Markets, Sept. 21, 1p.GlobalNews item - jewellery
DM201510-2054
2015
Kilalea, D.Firestone's frst drawdown of Liqhobong debt - project on track for first production Q4 2016.RBC Capital Markets, Sept. 24, 1/4p.Africa, LesothoNews item - Firestone
DM201511-2145
2015
Kilalea, D.Renard ahead of schedule as second tranche of stream received.RBC Capital Markets, Oct.. 1, 1p.Canada, QuebecNews item - Stornoway
DM201511-2146
2015
Kilalea, D.Mountain Province Diamonds Inc. suffering from lack of interest. Gahcho KueRBC Capital Markets, Oct. 1, 13p.Canada, Northwest TerritoriesNews item - Mountain Province Diamonds
DM201511-2147
2015
Kilalea, D.De Beers struggles in October Sight.RBC Capital Markets, Oct. 12, 4p.GlobalNews item - De Beers
DM201511-2148
2015
Kilalea, D.Lucara site visit to Karowe.RBC Capital Markets, Oct. 8, 4p.Africa, BotswanaNews item - Lucara
DM201511-2149
2015
Kilalea, D.Lucara site visit highlights plant advances. Karowe.RBC Capital Markets, Oct. 14, 18p.Africa, BotswanaNews item - Lucara
DM201512-2254
2015
Kilalea, D.Lucara Diamond Corp. a credible result in a tough market.RBC Capital Markets, Nov. 6, 9p.Africa, BotswanaNews item - Lucara
DM201512-2255
2015
Kilalea, D.Cloudy outlook should persist well into 2016. Overview of companiesRBC Capital Markets, Nov. 10, 14p.GlobalNews item - markets
DM201512-2256
2015
Kilalea, D.Gem Diamonds Limited … Large stone sweetens Letseng revenue in softer market. ( 357 carat stone sold for $ 19.3 m.RBC Capital Markets, Nov. 11, 5p.Africa, LesothoNews item - Gem Diamonds
DM201512-2257
2015
Kilalea, D.Petra Diamonds Ltd. Shining the spotlight on the balance sheet.RBC Capital Markets, Nov. 11, 18p.Africa, South AfricaNews item - Petra
DM201512-2258
2015
Kilalea, D.Petra's in the pink - 23 ct pink diamond recovered at Williamson.RBC Capital Markets, Nov. 27, 1p.Africa, TanzaniaNews item - Petra
DC201504-1544
2015
Kimberley Diamonds Ltd.Directors' report: Ellendale, LeralaKimberley Diamonds Ltd., Mar. 6, 2p.Australia, Africa, BotswanaNews item - press release
DC201505-1545
2015
Kimberley Diamonds Ltd.Ellendale diamond mine to continue operating in FY2016. Processing high grade stockpiles from Ellendale E4 and coarse tailings from E9.Kimberley Diamonds Ltd., Apr. 1, 2p.AustraliaNews item - press release
DC201506-1546
2015
Kimberley Diamonds Ltd.Highlights Ellendale and Lerala. Kimberley Diamonds Ltd., Apr. 30, 1p.Australia, Africa, BotswanaNews item - press release
DC201507-1547
2015
Kimberley Diamonds Ltd.Market update .. Ellendale diamond mine E4 and E9. Lerala funding.Kimberley Diamonds Ltd., May 26, 3p.Australia, Africa, BotswanaNews item - press release
DC201507-1548
2015
Kimberley Diamonds Ltd.KDL subsidiary earns 50% interest in Botswana joint venture. Lerala with Tilwane Kimberley Diamonds Ltd., June 6, 1p.Africa, BotswanaNews item - press release
DC201508-1542
2015
Kimberley Diamonds Ltd.Lerala project timeline and key milestones.Kimberley Diamonds Limited, July 24, 3p.Africa, BotswanaNews item - press release
DC201508-1543
2015
Kimberley Diamonds Ltd.Lump sum turnkey contract for Lerala plant modifications excecuted. ConsulmetKimberley Diamonds Limited, July 20, 3p.Africa, BotswanaNews item - press release
DC201509-1549
2015
Kimberley Diamonds Ltd.Lerala site update. Consulmet have substantially completed the upgrade.Kimberley Diamonds Ltd., Aug. 24, 1p.Africa, BotswanaNews item - press release
DC201510-2352
2015
Kimberley Diamonds Ltd.Annual statement of mineral resources … Lerala, Ellendale, Smoke Creek.Kimberley Diamonds Ltd., Sept. 8, 60p.Africa, Botswana, AustraliaNews item - press release
DC201510-2353
2015
Kimberley Diamonds Ltd.Market update - mining preparations Lerala Pit K3 de-watering.Kimberley Diamonds Ltd., Sept. 18, 2p.Africa, BotswanaNews item - press release
DC201511-2390
2015
Kimberley Diamonds Ltd.Potential for diamond bearing alluvial deposits at Lerala.Kimberley Diamonds Limited, Oct. 16, 5p.Africa, BotswanaNews item - press release
DC201512-2437
2015
Kimberley Diamonds Ltd.Final regulatory approval granted for Lerala mine re-opening.Kimberley Diamonds Ltd., Oct. 29, 1p.Africa, BotswanaNews item - press release
DS201503-0154
2015
King, J., Shigley, J.E., Jannucci, C.Exceptional pink to red diamonds: a celebration of the 30th. Argyle tender.Gems & Gemology, Vol. 50, 4, winter 2014, 15p.AustraliaHistory, review Argyle
DS201511-1853
2015
King, S.D.Mantle convection, the asthenosphere, and Earth's thermal history.Geological Society of America Special Paper, No. 514, pp. SPE514-07.MantleGeothermometry

Abstract: Calculations of mantle convection generally use constant rates of internal heating and time invariant core-mantle boundary temperature. In contrast parameterized convection calculations, sometimes called thermal history calculations, allow these properties to vary with time but only provide a single average temperature for the entire mantle. Here I consider 3D spherical convection calculations that run for the age of the Earth with heat producing elements that decrease with time, a cooling core boundary condition, and a mobile lid. The calculations begin with a moderately hot initial temperature, consistent with a relatively short accretion time for the formation of the planet. I find that the choice of a mobile or stagnant lid has the most significant effect on the average temperature as a function of time in the models. However the choice of mobile versus stagnant lid has less of an effect on the distribution of hot and cold anomalies within the mantle, or planform. I find the same low-degree (one upwelling or two upwelling) temperature structures in the mobile lid calculations that have previously been found in stagnant lid calculations. While having less of an effect on the mean mantle temperature, the viscosity of the asthenosphere has a profound effect on the pattern of temperature anomalies, even in the deep mantle. If the asthenosphere is weaker than the upper mantle by more than an order of magnitude, then the low-degree (one or two giant upwellings) pattern of temperature anomalies results. If the asthenosphere is less than an order of magnitude weaker than the upper mantle, then the pattern of temperature anomalies has narrow cylindrical upwellings and cold down going sheets. The low-degree pattern of temperature anomalies is more consistent with the plate model than the plume model (Foulger, 2007).
DS201502-0069
2014
Kinzie, C.R., Que Hee, S.S., Stich, A., Tague, K.A., Mercer, C., Razink, J.J., Kennett, D.J., DeCarli, P.S., Bunch, T.E., Wittke, J.H., Israde-Alantara, I., Bischoff, J.L., Goodyear, A.C., Tankersley, K.B., Kimbel, D.R., Culleton, B.J., Erlandson, J.M.Nanodiamond-rich layer across three continents consistent with major cosmic impact at 12,800 Cal BP.Journal of Geology, Vol. 122, Sept. pp. 475-506.South America, BrazilNanodiamonds
DS201502-0070
2015
Kiseleva, O., Zhmodik, S.Distribution and PGE mineralization in the formation of chromitite in ophiolite complexes ( Ospina-Kitoi Kharanur) and ultrabasic massifs of eastern Sayan, Southern Siberia.Economic Geology Research Institute 2015, Vol. 17,, #3203, 1p. AbstractRussiaMelting
DS201511-1854
2015
Kitawaki, H., Hisanaga, M., Yamamoto, M.Type 1b yellow to brownish yellow CVD synthetic diamonds seen at CGL.Journal of Gemmology, Vol. 34, 7, pp. 594-605.TechnologySynthetics

Abstract: In mid-2012, one of the international diamond grading laboratories in Antwerp reported undisclosed CVD synthetic diamonds, causing a stir in the diamond industry (Even-Zohar, 2012). Since then, reports of undisclosed CVD synthetics have also emerged from gem testing laboratories in India and China (D’ Haenens-Johanson et al., 2013; Song et al., 2014). Central Gem Laboratory (CGL) also reported on undisclosed over 1 ct size CVD synthetic diamonds (Kitawaki et al., 2013). Gem quality CVD products have been improved in their size and quality year after year, and a variety of colours have appeared. Most of the CVD synthetic diamonds reported previously are type II, however, recently some yellow CVD synthetic diamonds containing isolated substitutional nitrogen have been supplied to the gem market (Moe et al., 2014; Hainschwang, 2014). This report describes the gemmological features of fifteen yellow to brownish yellow type Ib CVD synthetic diamonds submitted to CGL without disclosure.
DM201510-2055
2015
Klein, G.Looking to Lac de Gras.Resourceclips.com, Aug. 27, 5p.Canada, Northwest TerritoriesLac de Gras arena
DS201509-0410
2015
Klein, G.New theory adds salt and water to diamond formation recipe. Ekati field Resource Clips, Aug. 19, 1/2p.Canada, Northwest TerritoriesDeposit - Fox

Abstract: Happening as it does deep within the Earth’s mantle, the process of creating diamonds has always been a bit murky. Laypeople understand the explanation has something to do with enormous pressure exerted on carbon. Hollywood once portrayed the process, perhaps just a tad simplistically, when it showed Superman producing a diamond by squeezing a lump of coal in his hand. But a paper published by the academic journal Nature on August 19 suggests ancient seawater played a key role, at least in the diamonds of the Northwest Territories’ Slave Craton.
DS201503-0155
2015
Kleinhanns, I.C., Fullgraf, T., Wilsky, F., Nolte, N., Fliegel, D., Klemd, R., Hansen, B.T.U-Pb zircon ages and (isotope) geochemical signatures of the Kamanjab In lier ( NW Namibia): constraints on Palaeoproterozoic crustal evolution along the southern Congo craton.Geological Society of London Special Publication: Continent formation through time., No. 389, pp. 165-195.Africa, NamibiaGeochemistry
DS201510-1777
2014
Koctizin, Yr.A.Trace element composition of primitive mantle - non-chondrite model.Deep-seated magmatism, its sources and plumes, Proceedings of XIII International Workshop held 2014., Vol. 2014, pp. 39-65.MantleGeochronology - isotope data
DS201510-1778
2015
Kogarko, L.N.Fractionation of zirconium and hafnium during evolution of a highly alkaline magmatic system, Lovozero massif, Kola Peninsula.Doklady Earth Sciences, Vol. 463, 2, pp. 792-794.Russia, Kola PeninsulaLovozero Masdif
DS201510-1779
2014
Kogarko, L.N.Geochemical features of radioactive elements in ultramafic-alkaline rocks ( example - largest in the globe Guli complex). Deep-seated magmatism, its sources and plumes, Proceedings of XIII International Workshop held 2014., Vol. 2014, pp. 22-31.Russia, SiberiaDeposit - Guli Complex
DS201511-1855
2015
Kolb, J., Bagas, L., Fiorentini, M.L.Metallogeny of the North Atlantic Craton in Greenland. ( not specific to diamonds).Mineralogical Magazine, Vol. 79, 4, pp. 815-855.Europe, GreenlandMetallogeny

Abstract: The North Atlantic Craton (NAC) extends along the coasts of southern Greenland. At its northern and southern margins, Archaean rocks are overprinted by Palaeoproterozoic orogeny or overlain by younger rocks. Typical granite-greenstone and granite-gneiss complexes represent the entire Archaean, with a hiatus from ~3.55-3.20 Ga. In the granulite- and amphibolite-facies terranes, the metallogeny comprises hypozonal orogenic gold and Ni-PGE-Cr-Ti-V in mafic-ultramafic magmatic systems. Gold occurrences are widespread around and south of the capital, Nuuk. Nickel mineralization in the Maniitsoq Ni project is hosted in the Norite belt; Cr and PGE in Qeqertarssuatsiaq, and Ti-V in Sinarsuk in the Fiskenæsset complex. The lower-grade metamorphic Isua greenstone belt hosts the >1000 Mt Isua iron deposit in an Eoarchaean banded iron formation. Major Neoarchaean shear zones host mesozonal orogenic gold mineralization over considerable strike length in South-West Greenland. The current metallogenic model of the NAC is based on low-resolution data and variable geological understanding, and prospecting has been the main exploration method. In order to generate a robust understanding of the metal endowment, it is necessary to apply an integrated and collective approach. The NAC is similar to other well-endowed Archaean terranes but is underexplored, and is therefore likely to host numerous targets for greenfields exploration.
DS201512-1935
2015
Kon, Y., Araoka, D., Ejima, T., Hirata, T.Rapid and precise determination of major and trace elements in CCRMP and USGS geochemical reference samples using femtosecond laser ablation ICP-MS.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov. 13-14, pp. 245-250.TechnologyCarbonatite

Abstract: We measured 10 major (SiO2, TiO2, Al2O3, total Fe2O3, MnO, MgO, CaO, Na2O, K2O, and P2O5) and 32 trace (Sc, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Nb, Cs, Ba, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Pb, Th, and U) elements in 16 geochemical reference samples (AGV-1, AGV-2, BCR-1, BCR- 2, BHVO-2, BIR-1a, DNC-1a, G-2, GSP-1, GSP-2, MAG-1, QLO-1, RGM-1, RGM-2, SGR-1b, and STM-1) distributed by United States Geological Survey (USGS) and three reference rock samples (SY-2, SY-3, and MRG-1) provided by Canadian Certifi ed Reference Materials Project (CCRMP) using inductively coupled plasma -mass spectrometry coupled with the femtosecond laser ablation sample introduction technique (fsLA-ICP-MS). Before the elemental analysis, fused glassbeads were prepared from the mixture of sample powder and high-purity alkali fl ux with a mixing ratio of 1:10. The abundances of the major and trace elements were externally calibrated by using glass beads containing the major and trace elements prepared from 17 Geological Survey of Japan (GSJ) geochemical reference samples (JB-1, JB-1a, JB-2, JB-3, JA-1, JA-2, JA-3, JR-1, JR-2, JR-3, JP-1, JGb-1, JGb-2, JG-1a, JG- 2, JG-3, and JSy-1). Typical analysis repeatabilities for these geochemical reference samples were better than 3% for Al2O3 and Na2O; <5% for SiO2, TiO2, total Fe2O3, MnO, MgO, CaO, K2O, P2O5, Zn, Rb, Sr, Zr, Nb, Ba, Nd, and U; <8% for Sc, V, Cr, Co, Y, Cs, La, Ce, Pr, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Pb, and Th; <11% for Ni and Cu. These data clearly demonstrate that high analytical repeatability can be achieved by the fsLA-ICP-MS technique with glass beads made from 0.5 g larger samples.
DS201506-0282
2015
Koptev, A., Calais, E., Burov, E., Leroy, S., Gerya, T.Dual continental rift systems generated by plume-lithosphere interaction. Central East African RiftNature Geoscience, Vol. 8, pp. 388-392.AfricaMagmatism
DS201510-1780
2015
Korsakov, A.V., Zhimuev, E.I., Mikhailenko, D.S., Demin, S.P., Kozmenko, O.A.Graphite pseudomorphs after diamonds: an experimental study of graphite morphology and the role of H2O in the graphitization process.Lithos, Vol. 236-237, pp. 16-26.TechnologyGraphite
DS201503-0156
2015
Kotkova, J., Janak, M.UHP kyanite eclogite associated with garnet peridotite and diamond bearing granulite, northern Bohemian Massif.Lithos, Vol. 226, pp. 255-264.EuropeBohemian
DS201503-0157
2015
Kozlov, E.N., Arzamastsev, A.A.Petrogenesis of metasomatic rocks in the fenetized zones of the Ozernaya Varaka alkaline ultrabasic complex Kola Peninsula.Petrology, Vol. 23, 1, pp. 45-67.Russia, Kola PeninsulaAlkalic
DS201509-0411
2015
Krupchatnikov, V.I., Vrublevskii, V.V., Kruk, N.N.Early Mesozoic lamproites and monzonitoids of southeastern Gorny Altai: geochemistry, Sr-Nd isotope composition, and sources of melts.Russian Geology and Geophysics, Vol. 56, pp. 825-843.RussiaChuya Complex

Abstract: Small intrusions of lamprophyres and lamproites (Chuya complex) and K-monzonitoids (Tarkhata and Terandzhik complexes) are widespread in southeastern Gorny Altai. Geochronological (U-Pb and Ar-Ar) isotope studies show their formation in the Early-Middle Triassic (~ 234-250 Ma). Lamproites have been revealed within two magmatic areas and correspond in geochemical parameters to the classical Mediterranean and Tibet orogenic lamproites. According to isotope data ((87Sr/86Sr)T = 0.70850-0.70891, (143Nd/144Nd)T = 0.512157-0.512196, 206Pb/204Pb = 17.95-18.05) and Th/La and Sm/La values, the Chuya lamproites and lamprophyres melted out from the enriched lithospheric mantle with the participation of DM, EM1, EM2, and SALATHO. The monzonitoid series of the Tarkhata and Terandzhik complexes are similar in petrographic and geochemical compositions but differ significantly in Sr-Nd isotope composition: The Tarkhata monzonitoids are close to the Chuya lamproites, whereas the Terandzhik ones show a higher portion of DM ((87Sr/86Sr)T = 0.70434-0.70497, (143Nd/144Nd)T = 0.512463-0.512487) in their source, which suggests its shallower depth of occurrence and the higher degree of its partial melting as compared with the derivates of the Chuya and Tarkhata complexes. The studied rock associations tentatively formed in the postcollisional setting under the impact of the Siberian superplume.
DS201511-1856
2015
Kryvoshlyk, IgorMathematical calculations of kimberlite diamond grade.Kryvoshlyk, 38ppt. Available ppt. Email ikryvoa481 @hotmail.comTechnologyMicrodiamonds - responses

Abstract: Diamond grade is the most important parameter of a kimberlite rock. A few hundreds of microprobe analyses of garnets picked randomly from a kimberlite concentrate might be enough to calculate mathematically accurate diamond grade.
DS201511-1857
2015
Kryvoshlyk, IgorKimberlite diamond grade ( actual projects and numbers)Kryvoshlyk, 18ppt. Available ppt. email ikryvoa481 @hotmail.comTechnologyMicrodiamonds - responses
DS201502-0071
2015
Kuzyura, A.V., Litvin, Yu.A., Jeffries, T.Interface partition coefficients of trace elements in carbonate-silicate parental media for diamonds and paragenetic inclusions ( experiments at 7.0-8.5 Gpa)Russian Geology and Geophysics, Vol. 56, 1-2, pp. 221-231.TechnologyDiamond inclusions
DS201511-1858
2013
Kvasnytsya, V.Crystal forms of natural microdiamonds.Diamond and Related Materials, Vol. 39, pp. 89-97.TechnologyMicrodiamonds - responses

Abstract: Geometrical crystallographic features of rare diamond micro-crystals (0.3-0.5 mm in diameter) from kimberlites having different complex flat and smooth faces are described. Such polyhedrons of microdiamonds are typically composed of two or more combinations of seven different crystal forms belonging to hexoctahedral symmetry class: octahedron, cube, rhombic dodecahedron, trisoctahedron, trapezohedron, tetrahexahedron and hexoctahedron. Many of them are not yet known for macro-crystals of this mineral. All these forms are found as small faces on the octahedral crystals. Both flat and smooth faces of octahedron and cube on such crystals have their own growth sectors. Flat faces of rhombic dodecahedron, different trisoctahedrons, trapezohedrons and hexoctahedrons occur as so-called faces of degeneration of octahedral growth planes. Nature of tetrahexahedron flat faces is not clear. An investigation of the complex diamond polyhedrons should give a new idea on crystal morphology of diamond, make more precise its symmetry and be important for the explanation of the nature of diamond on the whole.
DM201505-0886
2015
Kwantes, J.Comments on Peregrine Diamonds. PositiveResource Opportunities, Apr. 21, 1/4p.Canada, Nunavut, Baffin IslandNews item - Peregrine
DS201510-1781
2015
Kyser, K., Barr, J., Ihlenfeld, C.Applied geochemistry in mineral exploration and mining.Elements, Vol. 11, Aug. pp. 241-246.TechnologyNot specific to diamonds

Abstract: The prosperity of our societies and our standards of living are directly related to our ability to find, exploit, and manage our metal and mineral resources. Metal and mineral deposits are, in fact, geochemical anomalies and, as such, applied geochemistry plays a critical role throughout the mineral resources value chain, from early stage exploration to mine closure. The fundamentals of element mobility (i.e. transport and fixation) in the near-surface environment are used by geochemists to detect mineral deposits at depth, reveal element distributions in and around deposits, assess the total geochemical environment, and refine effective and benign extraction and waste disposal techniques. Both pure- and applied-research ventures play fundamental roles in providing the techniques to manage metal resources and thereby benefit society.
DM201508-0887
2015
Laniado, E.A.Forging a path ahead for the diamond market.info @ehudlaniado.com, July 6, 3p.GlobalNews item - markets
DS201510-1782
2015
Lavrentev, Yu.G., Karmanov, N.S., Usova, L.V.Electron probe microanalysis of minerals: micranalyzer or scanning electron microscope?Russian Geology and Geophysics, Vol. 56, pp. 1154-1161.TechnologySpectrometry

Abstract: The results of electron probe microanalysis of several rock-forming minerals by wavelength-dispersive spectrometry (WDS) and energy-dispersive spectrometry (EDS) are compared, and the metrological characteristics of both methods are studied. The measurements were made with the use of a JXA-8100 (JEOL) microanalyzer with five wavelength-dispersive spectrometers and a MIRA 3 LMU (Tescan) scanning electron microscope equipped with an INCA Energy 450 XMax 80 (Oxford Instruments) microanalysis system. Specimens with olivine, garnet, pyroxene, ilmenite, and Cr-spinel grains were analyzed. The variation coefficients that characterize the repeatability of a single determination are found to be ~ 0.5% for WDS and ~ 0.9% for EDS in the compositional range of the main components (C > 10%). For minor components (1% < C < 10%), the variation coefficients are 1.4% and 3.0%, respectively, and for impurities (0.3% < C < 1%), 2.7% and 13%, respectively. For lower contents EDS is almost inapplicable. The ratio of the results obtained by the two methods is reproduced with high precision: For major components, the variation coefficient is 0.56%; for minor components, 1.7%; and even for impurities, it is ~ 8%. The magnitude of the bias is between 0.2 and 3.2 rel.%, which is acceptable. The results show that the accuracies of WDS and EDS are similar for measuring major and minor components of rock-forming minerals. Energy-dispersive spectrometry is inferior to wavelength-dispersive spectrometry for impurities and is completely inapplicable for still lower contents. This method is easier to implement, and the results are available soon after switching on the instrument. Wavelength-dispersive spectrometry needs more time for preparation, but it ensures a precise high-efficiency large-scale analysis of samples of similar compositions, even when the element contents are lower than 1%.
DS201507-0320
2015
Lazereva, E.V., Zhmodik, S.M., Dobretsov, N.L., Tolstov, A.V., Shcherbov, B.L., Karmanov, N.S., Gerasimov, E.Yu., Bryanskaya, A.V.Main minerals of abnormally high grade ores of the Tomtor deposit ( Arctic Siberia).Russian Geology and Geophysics, Vol. 56, pp. 844-873.RussiaDeposit - Tomtor
DS201509-0412
2015
Le Losq, C., Mysen, B.O., Cody, G.D.Water and magmas: insights about the water solution mechanisms in alkali silicate melts from infrared, Raman, and 29 Si solid-state NMR spectroscopies.Progress in Earth and Planetary Science, Vol. 2, 22p.MantleMagmatism

Abstract: Degassing of water during the ascent of hydrous magma in a volcanic edifice produces dramatic changes in the magma density and viscosity. This can profoundly affect the dynamics of volcanic eruptions. The water exsolution history, in turn, is driven by the water solubility and solution mechanisms in the silicate melt. Previous studies pointed to dissolved water in silicate glasses and melts existing as molecules (H 2 O mol species) and hydroxyl groups, OH. These latter OH groups commonly are considered bonded to Si 4+ but may form other bonds, such as with alkali or alkaline-earth cations, for instance. Those forms of bonding influence the structure of hydrous melts in different ways and, therefore, their properties. As a result, exsolution of water from magmas may have different eruptive consequences depending on the initial bonding mechanisms of the dissolved water. However, despite their importance, the solution mechanisms of water in silicate melts are not clear. In particular, how chemical composition of melts affects water solubility and solution mechanism is not well understood. In the present experimental study, components of such information are reported via determination of how water interacts with the cationic network of alkali (Li, Na, and K) silicate quenched melts. Results from 29 Si single-pulse magic-angle spinning nuclear magnetic resonance ( 29 Si SP MAS NMR), infrared, and Raman spectroscopies show that decreasing the ionic radius of alkali metal cation in silicate melts results in decreasing fraction of water dissolved as OH groups. The nature of OH bonding also changes as the alkali ionic radius changes. Therefore, as the speciation and bonding of water controls the degree of polymerization of melts, water will have different effects on the transport properties of silicate melts depending on their chemical composition. This conclusion, in turn, may affect volcanic phenomena related to the viscous relaxation of hydrous magmas, such as for instance the fragmentation process that occurs during explosive eruptions.
DS201508-0362
2015
Lee, C-T.A., Anderson, D.L.Continental crust formation at arcs, the arclogite "delamination" cycle, and one origin for fertile melting anomalies in the mantle.Science Bulletin, DOI: 10.1007/s11434-015-088-6 online 16p.MantleEclogite
DS201508-0363
2015
Lee, C-T.A., McKenzie, N.R.Geochemistry: rise of the continents.Nature Geoscience, Vol. 8, pp. 506-507.MantlePlate Tectonics
DS201502-0072
2015
Lee, J., Jung, H.Lattice- preferred orientation of olivine found in diamond bearing garnet peridotites in Finsch, South Africa and implications for seismic anisotropy.Journal of Structural Geology, Vol. 70, Jan. pp. 12-22.Africa, South AfricaDeposit - Finsch
DS201511-1859
2014
Lee, J.A., Caudill, S.B., Mixon, F.G.Jr.Shine bright like a diamond: a hedonic model of grading and pricing an experience good. ( diamonds)Applied Economics, Vol. 46, 16, pp. 1829-1838.GlobalDiamond market

Abstract: Diamonds are generally evaluated on the basis of sensory characteristics, such as carat (weight), colour, clarity and cut. However, given the experience goods nature of diamonds, few consumers grasp how the sensory characteristics of these stones are evaluated by the gemological grading laboratories that independently issue diamond reports. This study extends prior research by determining whether diamonds graded by certain gemological laboratories are subject to pricing premiums or discounts in online retail markets. Regression models employing a sample of 169 483 real-time diamond offerings from online diamond retailers (e.g. Blue Nile, James Allen and Adiamor) find significant price discounts attributable to diamonds graded by the European Gemological Laboratory USA in relation to diamonds graded by the Gemological Institute of America (GIA) and significant price premiums attributable to diamonds graded by the American Gem Society in relation to diamonds graded by the GIA.
DS201502-0073
2015
Lee, S., Suh, J., Park, H-D.BoreholeAR: a mobile tablet application for effective borehole database visualization using an augmented reality technology.Computers & Geosciences, Vol. 76, pp. 41-49.TechnologyNot specific to diamonds
DC201509-1550
2015
Lemarne Corporation LimitedSigned two non-binding heads of agreement with Central Kimberley Diamonds ( CKD) and Unique Sapphires Pty. Ltd. ( an interest in Palmietfontein diamond project.Lemarne Corporation Limited, Aug. 18, 3p.Africa, South AfricaNews item - press release
DS201508-0364
2015
Li, H., Zhang, Z., Ernst, R., Lu, L., Santosh, M., Zhang, D., Cheng, Z.Giant radiating mafic dyke swarm of the Emeishan Large Igneous Province: identifying the mantle plume centre.Terra Nova, Vol. 27, 4, pp. 247-257.ChinaMantle plume
DS201507-0321
2015
Li, M., McNamara, A.K.The difficulty for subducted oceanic crust to accumulate at the Earth's core-mantle boundary.Journal of Geophysical Research, Vol. 118, 4, pp. 1807-1816.MantleSubduction
DS201511-1860
2014
Linton, T., Paul, A.Cultj diamond selector IIItm. ( jewellery stores)Australian Gemmologist, Vol. 24, 2, pp. 46-47.TechnologyDiamond tester
DS201507-0322
2015
Liu, J., Scott, J.M., Martin, C.E., Pearson, D.G.The longevity of Archean mantle residues in the convecting upper mantle and their role in young continent formation.Earth and Planetary Science Letters, Vol. 424, pp. 109-118.MantleConvection
DS201511-1861
2015
Liu, L.The ups and downs of North America: evaluating the role of mantle dynamic topography since the Mesozoic.Reviews of Geophysics, Vol. 53, 3, pp. 1022-1049.Canada, United StatesGeodynamics

Abstract: The driving force for transient vertical motions of Earth's surface remains an outstanding question. A main difficulty lies in the uncertain role of the underlying mantle, especially during the geological past. Here I review previous studies on both observational constraints and physical mechanisms of North American topographic evolution since the Mesozoic. I first summarize the North American vertical motion history using proxies from structural geology, geochronology, sedimentary stratigraphy, and geomorphology, based on which I then discuss the published physical models. Overall, there is a progressive consensus on the contribution of mantle dynamic topography due to buoyancy structures associated with the past subduction. At the continental scale, a largely west-to-east migrating deformation pattern suggests an eastward translation of mantle dynamic effects, consistent with models involving an eastward subduction and sinking of former Farallon slabs since the Cretaceous. Among the existing models, the inverse model based on an adjoint algorithm and time-dependent data constraints provides the most extensive explanations for the temporal changes of North American topography since the Mesozoic. At regional scales, debates still exist on the predicted surface subsidence and uplift within both the western and eastern United States, where discrepancies are likely due to differences in model setup (e.g., mantle dynamic properties and boundary conditions) and the amount of time-dependent observational constraints. Toward the development of the next-generation predictive geodynamic models, new research directions may include (1) development of enhanced data assimilation capabilities, (2) exploration of multiscale and multiphysics processes, and (3) cross-disciplinary code coupling.
DS201508-0365
2015
Liu, Xi, Zhong, ShijieThe long wave length geoid from three dimensional spherical models of thermal and thermochemical mantle convection.Journal of Geophysical Research, Vol. 120, 6, pp. 4572-4596.MantleGeothermometry
DS201508-0366
2015
Liu, Y., Chen, Z., Yang, Z., Sun, X., Zhu, Z., Zhang, Q.Mineralogical and geochemical studies of brecciated ores in the Dalucao REE deposit, Sichuan Province, southwestern China.Ore Geology Reviews, Vol. 70, pp. 613-636.ChinaCarbonatite
DS201502-0074
2015
Logvinova, A.M., Taylor, L.A., Fedorova, E.N., Yelisseyev, A.P., Wirth, R., Howarth, G., Reutsky, V.N., Sobolev, N.V.A unique Diamondiferous peridoite xenolith from the Udachnaya kimberlite pipe, Yakutia: role of subduction in diamond formation.Russian Geology and Geophysics, Vol. 56, 1, pp. 306-320.Russia, YakutiaDeposit - Udachnaya
DS201501-0031
2014
Lollar, B.S., Onstott, T.C., Lacrampe-Couloume, G., Ballentine, C.J.The contribution of the Precambrian continental lithosphere to global H2 production.Nature, Vol. 516, Dec. 18, pp. 379-382.MantleHydrogeology
DS201502-0075
2014
Lollar, S.Ancient, hydrogen rich waters discovered deep underground at locations around the world.Nature, Vol. 516, pp. 379-382.Canada, Africa, South Africa, Europe, ScandinaviaChemistry - water
DS201510-1783
2015
Lombard, L.Threat economies and armed conservation in northeastern Central African Republic.Geoforum, in press availableAfrica, Central African RepublicCSR

Abstract: This article, based on ethnographic and archival research in the northeastern parklands of the Central African Republic (CAR), explores the area’s history of armed conservation. Critical scholarly accounts of armed conservation practices and projects often starkly contrast the people involved in them: there are agents of the state, or state-like actors, who seek to dominate, territorialize, and discipline, often using violence to do so, and there are local populations who are dispossessed of their lands and resources without compensation and forced into new kinds of poverty, despite rhetoric and practices meant to inculcate "local participation". The case presented here forces us to re-think these accounts. Rather than pursuing authority in the sense of expanding control over other people, people in northeastern CAR (whether putatively in favor of or opposed to conservation) are working to create and maintain access to the status of an income. To do so they engage in practices of threatening and hiding. While the means to use physical force are not equally shared, capacities to threaten and hide are widely held, and organizational and other hierarchies are unstable, making it difficult to describe any of this as a matter of domination and resistance. Expanding on literature that examines processes of green militarization (Lunstrum, 2014), the article focuses on the interactional dynamics of armed conservation to show that threats are as important as acts of physical violence, and that hiding-whether in the bush or plain sight-is critical to understanding armed conservation in an area where the state is largely seen as absent.
DM201507-0888
2015
London Mining JournalBotswana, diamonds and the Russian connection. John Teeling comments.London Mining Journal, June 3, 1/2p.Africa, BotswanaNews item - Connemara
DM201508-0889
2015
London Mining JournalAlrosa Grib grab could be nearer. ( Grib sits inside a giant oil company )London Mining Journal, July 7, 1/4p.RussiaNews item - Grib
DM201510-2056
2015
London Mining JournalSynthetics' impact not clear-cut.London Mining Journal, Sept. 14, 1/2p.GlobalNews item - synthetics
DM201511-2150
2015
London Mining JournalDiamonds in the rough… Anglo American, courtesy of De Beers division, is in the news today thanks to a poor outlook for diamonds, but the company with the bigger problem is the world's third biggest diamond miner, Rio Tinto.London Mining Journal, Oct. 22, 1p.GlobalNews item - De Beers, Rio Tinto
DM201512-2327
2015
London Mining JournalWilliam Lamb has been named CEO of the year.London Mining Journal, Oct. 29, 1/2p.Africa, BotswanaNews item - Lucara
DS201505-0238
2015
Loomis, I.Earth's tectonic plates skitter about.Sciencemag.org, Mar. 20, 1p.GlobalGeodynamics
DS201506-0283
2015
Loranov, S.S., Goncharov, A.F., Litasov, K.D.Optical properties of siderite ( FeCo3) across the spin transition: crossover to iron rich carbonates in the lower mantle.American Mineralogist, Vol. 100, pp. 1059-1064.MantleSubduction
DS201503-0158
2015
Lu, G., Kaus, B.J.P., Zhao, L., Zheng, T.Self-consistent subduction initiation induced by mantle flow.Terra Nova, Vol. 27, 2, pp. 130-138.MantleSubduction
DC201502-1551
2015
Lucapa Diamond CompanyDiamond mining results at Lulo.Lucapa Diamond Company, Jan 22, 3p.Africa, AngolaNews item - press release
DC201504-1552
2015
Lucapa Diamond CompanyLucapa prepares to mine high grade diamond areas at Lulo. Lucapa Diamond Company, Mar. 10, 4p.Africa, AngolaNews item - press release
DC201505-1553
2015
Lucapa Diamond CompanyLucapa steps up kimberlite diamond program at Lulo. L46 and E46Lucapa Diamond Company, Mar. 23, 2p.Africa, AngolaNews item - press release
DC201505-1554
2015
Lucapa Diamond CompanyChairman's summary of year to date … Lulo Lucapa Diamond Company, Apr. 1p.Africa, AngolaNews item - press release
DC201505-1555
2015
Lucapa Diamond CompanyLucapa exceeds diamond mining and processing targets. 1,335 carats. LuloLucapa Diamond Company, Apr. 8, 5p.Africa, AngolaNews item - press release
DC201505-1556
2015
Lucapa Diamond CompanyLarge 63 carat type 11a diamond recovered at Lulo.Lucapa Diamond Company, Apr. 16, 3p.Africa, AngolaNews item - press release
DC201508-1557
2015
Lucapa Diamond CompanyNew fleet arrives to scale up diamond mining at Lulo.Lucapa Diamond Company, June 30, 2p.Africa, AngolaNews item - press release
DC201508-1558
2015
Lucapa Diamond CompanyLucapa is pleased to announce the Lulo diamond project achieved its monthly processing target of 10,000 bulk cubic metres for the month of June.Lucapa Diamond Company, July 6, 3p.Africa, AngolaNews item - press release
DC201509-1559
2015
Lucapa Diamond CompanyDiamond mining licence expanded at Lulo.Lucapa Diamond Company Limited, Aug. 6, 3p.Africa, AngolaNews item - press release
DC201509-1560
2015
Lucapa Diamond CompanyMore large diamonds at Lulo. Lucapa Diamond Company Limited, Aug. 18, 4p.Africa, AngolaNews item - press release
DC201510-2354
2015
Lucapa Diamond CompanyMore large valuable diamonds at Lulo 40.59 ( type IIa)Lucapa Diamond Company, Sept. 15, 3p.Africa, AngolaNews item - press release
DC201510-2355
2015
Lucapa Diamond CompanyLulo diamonds sell for $ 1.02 million.Lucapa Diamond Company, Sept. 14, 2p.Africa, AngolaNews item - press release
DC201511-2391
2015
Lucapa Diamond Company74.5 carat diamond among more large recoveries at Lulo. L259 kimberliteLucapa Diamond Company, Oct. 19, 3p.Africa, AngolaNews item - press release
DC201512-2438
2015
Lucapa Diamond CompanyLulo diamonds sell for $A 2.1 million.Lucapa Diamond Corporation, Nov. 16, 1p.Africa, AngolaNews item - press release
DC201512-2439
2015
Lucapa Diamond CompanyLucapa Diamond to explore L259and L13/15 kimberlites.Lucapa Diamond Corporation, Nov. 23, 1p.Africa, AngolaNews item - press release
DC201501-1561
2014
Lucara Diamond CorporationProvides operating outlook for 2015. KaroweLucara Diamond Corporation, Dec. 8, 2p.Africa, BotswanaNews item - press release
DC201502-1562
2014
Lucara Diamond CorporationLucara announces decision on Mothae.Lucara Diamond Corporation, Dec. 22, 1p.Africa, LesothoNews item - press release
DC201502-1563
2014
Lucara Diamond CorporationLucara announces corporate change. George leaving.Lucara Diamond Corporation, Dec. 31, 1p.Africa, BotswanaNews item - press release
DC201503-1564
2015
Lucara Diamond CorporationLucara declares special dividend on strong 2014 performance. KaroweLucara Diamond Corporation, Feb. 18, 1p.Africa, BotswanaNews item - press release
DC201505-1565
2015
Lucara Diamond CorporationLucara recovers 342 carat diamond at its Karowe mine.Lucara Diamond Corporation, Apr. 20, 2p.Africa, BotswanaNews item - press release
DC201506-1566
2015
Lucara Diamond CorporationLucara enters into a memorandum of understanding to sell Mothae.Lucara Diamond Corporation, May 4, 1p.Africa, LesothoNews item - press release
DC201506-1567
2015
Lucara Diamond CorporationFirst quarter results: Lucara on schedule to complete plant optimization and to process South Lobe ore. ( Karowe)Lucara Diamond Corporation, May, 12, 6p.Africa, BotswanaNews item - press release
DC201506-1568
2015
Lucara Diamond CorporationExceptional stone tender announced. KaroweLucara Diamond Corporation, May 26, 1p.Africa, BotswanaNews item - press release
DC201508-1569
2015
Lucara Diamond CorporationLucara's exceptional stone tender. KaroweLucara Diamond Corporation, July 16, 1p.Africa, BotswanaNews item - press release
DC201509-1570
2015
Lucara Diamond CorporationLucara reports strong Q2 performance and updates on the plant optimization project. KaroweLucara Diamond Corporation, Aug. 11, 3p.Africa, BotswanaNews item - press release
DC201509-1571
2015
Lucara Diamond CorporationLucara reports ongoing recovery of exceptional diamonds. Karowe 336, 184, 94, 86 carats stones.Lucara Diamond Corporation, Aug. 17, 2p.Africa, BotswanaNews item - press release
DC201510-2356
2015
Lucara Diamond CorporationLucara announces dates for second exceptional stone tender. Nov. 2-11. KaroweLucara Diamond Corporation, Sept. 8, 2p.Africa, BotswanaNews item - press release
DC201511-2392
2015
Lucara Diamond CorporationLucara provides exploration update. Karowe and BK02, AK11 and AK12.Lucara Diamond Corporation, Oct. 15, 1p.Africa, BotswanaNews item - press release
DC201512-2440
2015
Lucara Diamond CorporationLucara generates strong quarterly cash flow and significant operating margins. KaroweLucara Diamond Corporation, Nov. 5, 5p.Africa, BotswanaNews item - press release
DC201512-2441
2015
Lucara Diamond CorporationLucara adds $ US 30 million to 2015 revenue from latest exceptional stone tender.Lucara Diamond Corporation, Nov. 12, 1p.Africa, BotswanaNews item - press release
DC201512-2442
2015
Lucara Diamond CorporationLucara makes diamond history; recovers 1,111 carat diamond.Lucara Diamond Corporation, Nov. 18, 1p.Africa, BotswanaNews item - press release
DS201508-0367
2015
Luguet, A., Behrens, M., Pearson, D.G., Konig, S., Herwartz, D.Significance of the whole rock Re-Os ages in cryptically and modally metasomatized cratonic peridotites: constraints from HSE-Se-Te systematics.Geochimica et Cosmochimica Acta, Vol. 164, pp. 441-463.Africa, BotswanaDeposit - Letlhakane
DS201511-1862
2015
Lustrino, M., Anderson, D.L.The mantle isotopic printer: basic mantle plume geochemistry for seismologists and geodynamicists.Geological Society of America Special Paper, No. 514, pp. SPE514-16.MantlePhysics

Abstract: High-temperature geochemistry combined with igneous petrology is an essential tool to infer the conditions of magma generation and evolution in the Earth’s interior. During the last thirty years a large number of geochemical models of the Earth, essentially inferred from the isotopic composition of basaltic rocks, have been proposed. These geochemical models have paid little attention to basic physics concepts, broad-band seismology, or geological evidence, with the effect of producing results that are constrained more by assumptions than by data or first principles. This may not be evident to seismologists and geodynamicists. A common view in igneous petrology, seismology and mantle modelling is that isotope geochemistry (e.g., the Rb-Sr, Sm-Nd, U-Th-Pb, U-Th-He, Re-Os, Lu-Hf, and other more complex systems) has the power to identify physical regions in the mantle, their depths, their rheological behaviour and the thermal conditions of magma generation. We demonstrate the fallacy of this approach and the model-dependent conclusions that emerge from unconstrained or poorly constrained geochemical models that do not consider physics, seismology (other than teleseismic travel time tomography and particularly compelling colored mantle cross sections) and geology. Our view may be compared with computer printers. These can reproduce the entire range of colors using a limited number of basic colors (black, magenta, yellow, and cyan). Similarly, the isotopic composition of oceanic basalts and nearly all their primitive continental counterparts can be expressed in terms of a few mantle end-members. The four most important (actually "most extreme", since some are extraordinarily rare) mantle end-members identified by isotope geochemists are DMM or DUM [Depleted MORB (mid-ocean-ridge basalt) Mantle or Depleted Upper Mantle], HiMu (High-Mu, where Mu = ? = 238U/204Pb), EMI and EMII (Enriched Mantle type I and type II). Other mantle end-members, or components, have been proposed in the geochemical literature (e.g., PHeM, FoZo, LVC, PreMa, EMIII, CMR, LoMu, and C) but these can be considered to be less extreme components or mixtures in the geochemical mantle zoo. Assuming the existence of these extreme "colors" in the mantle isotopic printer, the only matter for debate is their location in the Earth’s interior. At least three need long-time insulation from convection-driven homogenization or mixing processes. In other words, it needs to be defined where these extreme isotopic end-members are located. In our view, no geochemical, geological, geophysical and physical arguments require the derivation of any basalt or magma from the deep mantle. Arguments to the contrary are assumption-based. The HiMu, EMI and EMII end-members can be entirely located in the shallow non-convecting volume of the mantle, while the fourth, which is by far the more abundant volumetrically, (DMM or DUM) can reside in the Transition Zone. This view is inverted compared with current canonical geochemical views of the Earth’s mantle, where the shallowest portions are assumed to be DMM-like (ambient mantle) and the EMI-EMII-HiMu end-members are assumed to be isolated, located in the deep mantle, and associated with thermal anomalies. We argue that the ancient, depleted signatures of DMM imply long-term isolation from recycling and crustal contamination while the enriched components are not free of contamination by shallow materials and can therefore be shallow.
DS201504-0206
2015
Luth, R.W., Stachel, T.The buffering capacity of lithospheric mantle: implications for diamond formation.Contributions to Mineralogy and Petrology, Vol 168, 12p.MantleOxygen barometry
DS201508-0368
2015
Lyalina, L., Zolotarev, A.Jr., Selivanova, E., Savchenko, Ye., Zozulya, D., Krivovichev, S., Mikhailova, Yu.Structural characterization and composition of Y-rich hainite from Sakharojok nepheline syenite pegmatite ( Kola Peninsula, Russia).Mineralogy and Petrology, Vol. 109, 4, pp. 443-451.Russia, YakutiaNepheline syenite
DM201502-0890
2014
MacauhubSale of diamonds earns Angola US$ 1.2 billionMacauhub/AO, Dec. 26, 1/4p.Africa, AngolaNews item - economics
DM201502-0891
2015
MacauhubAngola expects important discovery of diamond deposits ( Alrosa and Endiama).Macauhub/AO, Jan. 22, 1p.Africa, AngolaNews item - Endiama
DM201503-0892
2015
MacauhubAngola mines 10 million carats of diamonds in 2014 ( worth 1.6 billion.Macauhub.com, Feb. 12, 1/4p.Africa, AngolaNews item - Endiama
DM201504-0893
2015
MacauhubAngolan government grants new artisanal diamond mining rights. Between Lunda Norte and Lunda Sul.Macauhub.com.mo, Mar. 12, 1/4p.Africa, AngolaNews item - legal
DM201506-0894
2015
MacauhubRevenue from sale of diamonds in Angola grows 8.8 % in January/February. 1.4 million carats sold for $US 195.7 million.Macauhub.com, Apr. 23, 1/4p.Africa, AngolaNews item - economics
DM201509-0895
2015
MacauhubDiamond sales increase by 35% in Angola. Tchiuzo, Luaxe, KimangueMacauhub.com, Aug. 3, 1/4p.Africa, AngolaNews item - production
DM201511-2151
2015
MacauhubChairman of Angola's Endiama's proposes more commercial promotion of diamonds.macauhub.com, Oct. 8, 1/4p.Africa, AngolaNews item - Endiama
DM201512-2259
2015
MacauhubDiamond sales in Angola total US$99 million in September.macauhub.com, Nov. 4, 1/4p.Africa, AngolaNews item - Endiama
DS201503-0159
2015
MacGregor, D.The Fairway concept and chance mapping: African petroleum and carbonatite examples.PDAC 2015, Abstract, 1p.Africa, East AfricaCarbonatite
DS201509-0414
2015
Macgregor, I.D.Empirical geothermometers and geothermobarometers for spinel peridotite phase assemblages.International Geology Review, Vol. 57, 15, pp. 1940-1974.TechnologyPeridotite, experimental petrology

Abstract: Experimental synthesis of spinel peridotite phase assemblages for a range of compositions that mimic natural samples is used to derive a set of empirical geothermometers and geothermobarometers represented by multiple linear regression best-fit surfaces that link the variables of temperature, pressure, and composition. The calibrated geothermometers use reactions that govern the solubility of Al and Cr in both pyroxenes and the Mg–Fe exchange between silicates and spinel. Geothermobarometers map the Mg–Fe exchange between coexisting olivine and clinopyroxene and pyroxenes and Ca–Mg exchange between coexisting pyroxenes. Application of the geothermometers and geothermobarometers to suites of naturally occurring samples indicates that while reactions governing the Cr and Al solubility and solvus of orthopyroxene give useful estimates of ‘original’ mantle temperatures and pressures, respectively, comparable reactions for clinopyroxene yield estimates that are variably dependent on the transport phase of the sample suites. Temperature and pressure estimates from reactions governing Mg and Fe exchange between silicates and spinel and coexisting silicates are all sensitive to the later transport stage of the samples.
DS201512-1936
2015
Mackay, D.A.R., Simandl, G.J.Niobium and tantalum: geology, markets, and supply chains.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov. 13-14, pp. 13-22.GlobalNiobium, tantalum

Abstract: Until 2014, niobium (Nb) and tantalum (Ta) were on the critical metals list of the European Union (European Commission, 2011; 2014). Both Ta and Nb have high levels of supply chain risk and even temporary disruptions in supply could be difficult to cope with. The Ta market is subject to infl ux of ‘conflict’ columbite-tantalite concentrate, or ’Coltan,’ into the supply chain, displacing production in Australia and Canada. The growing consumer appetite for goods made of ethically sourced or ‘confl ict-free’ minerals and metals has put pressure on manufacturers of components for consumer electronics, such as smart phones, laptop computers, computer hard drives, digital cameras, GPS navigation systems, and airbag triggers to stop using Ta from ‘confl ict’ areas. Other uses of Ta include medical implants, super alloys used in jet turbine and rocket nozzle production, corrosion prevention in chemical and nuclear plants, as a sputtering target, and in optical lenses (Tantalum-Niobium International Study Center, 2015a, b). These applications make Ta economically and strategically important to industrialised countries (European Commission, 2011, 2014; Brown et al., 2012; Papp, 2012). Niobium (Nb) is primarily used in high-strength low-alloy (HSLA) steel used extensively in the oil and gas and automotive industries. Niobium is also a major component in vacuum-grade alloys used in rocket components and other aeronautic applications (Tantalum-Niobium International Study Center, 2015a, c). Demand for Nb is increasing due to greater use of Nb in steel making in China, India, and Russia (Roskill, 2013b; Mackay and Simandl, 2014). Because most primary Nb production is restricted to a single country (Brazil), security of supply is considered at risk (European Commission, 2014). New sources of supply may be developed to diversify geographic location of supply for strategic reasons (Mackay and Simandl, 2014). Herein we summarize the geology, market, and supply chains of Niobium and Tantalum metals.
DS201512-1937
2015
Mackay, D.A.R., Simandl, G.J.,Ma, W., Gravel, J., Redfearn, M.Indicator minerals in exploration for speciality metal deposits: a QEMSCAN approach.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov. 13-14, pp. 211-218.TechnologyRare earths

Abstract: Quantitative Evaluation of Materials by Scanning electron microscopy (QEMSCAN®) was used to assess carbonatite indicator minerals in fl uvial sediments from the drainage area of the Aley carbonatite, in north-central British Columbia. QEMSCAN® is a viable method for rapid detection and characterization of carbonatite indicator minerals with minimal processing other than dry sieving. Stream sediments from directly above, and up to 11 km downstream, of the carbonatite deposit were selected for this indicator mineral study. The geology of the Aley carbonatite is described by Mäder (1986), Kressal et al. (2010), McLeish (2013), Mackay and Simandl (2014), and Chakhmouradian et al. (2015). Traditional indicator mineral exploration methods use the 0.25-2.0 mm size fraction of unconsolidated sediments (Averill, 2001, 2014; McCurdy, 2006, 2009; McClenaghan, 2011, 2014). Indicator minerals are detectable by QEMSCAN® at particle sizes smaller than those used for hand picking (<0.25 mm). Pre-concentration (typically by shaker table) is used before heavy liquid separation, isodynamic magnetic separation, optical identifi cation using a binocular microscope, and hand picking (McClenaghan, 2011). Following additional sieving, the 0.5-1 and 1-2 mm fractions are hand picked for indicator minerals while the 0.25-0.5 mm fraction is subjected to paramagnetic separation before hand picking (Averill, 2001; McClenaghan, 2011). Hand picking indicator minerals focuses on monomineralic grains, and composite grains may be lost during processing. Composite grains are diffi cult and time consuming to hand pick and characterize using optical and Scanning Electron Microscopy (SEM) methods. A single grain mount can take 6-12 hours to chemically analyse (Layton- Matthews et al., 2014). Detailed sample analysis using the QEMSCAN® Particle Mineral Analysis routine allows for 5-6 samples to be analyzed per day. When only mineral identifi cation and mineral concentrations and counts are required, the use of a Bulk Mineral Analysis routine reduces the analysis time from ~4 hours to ~30 minutes per sample.
DS201509-0415
2015
Magee, C., Mahaaj, S.M., Wrona, T., Jackson, A-L.Controls on the expression of igneous intrusions in seismic reflection data.Geosphere, Vol. 11, 4, pp. 1024-1041.MantleMagmatism

Abstract: The architecture of subsurface magma plumbing systems influences a variety of igneous processes, including the physiochemical evolution of magma and extrusion sites. Seismic reflection data provides a unique opportunity to image and analyze these subvolcanic systems in three dimensions and has arguably revolutionized our understanding of magma emplacement. In particular, the observation of (1) interconnected sills, (2) transgressive sill limbs, and (3) magma flow indicators in seismic data suggest that sill complexes can facilitate significant lateral (tens to hundreds of kilometers) and vertical (<5 km) magma transport. However, it is often difficult to determine the validity of seismic interpretations of igneous features because they are rarely drilled, and our ability to compare seismically imaged features to potential field analogues is hampered by the limited resolution of seismic data. Here we use field observations to constrain a series of novel seismic forward models that examine how different sill morphologies may be expressed in seismic data. By varying the geologic architecture (e.g., host-rock lithology and intrusion thickness) and seismic properties (e.g., frequency), the models demonstrate that seismic amplitude variations and reflection configurations can be used to constrain intrusion geometry. However, our results also highlight that stratigraphic reflections can interfere with reflections generated at the intrusive contacts, and may thus produce seismic artifacts that could be misinterpreted as real features. This study emphasizes the value of seismic data to understanding magmatic systems and demonstrates the role that synthetic seismic forward modeling can play in bridging the gap between seismic data and field observations.
DS201505-0237
2014
Majka, J., Rosen, A., Janak, M., Froitzheim, N., Klonowska, I., Maneck, M., Sasinkova, V., Yoshida, K.Microdiamond discovered in the Seve Nappe (Scandinavian Caledonides) and its exhumation by the "vacuum-cleaner" mechanism.Geology, Vol. 42, 12, pp. 1107-110.EuropeMicrodiamonds
DS201502-0076
2014
Majka, J., Rosen, A., Janak, M., Froitzheim, N., Klonowska, I., Manecki, M., Sasinkova, V., Yoshida, K.Microdiamond discovered in the Seve Nappe ( Scandinavian Caledonides) and its exhumation by the "vacuum-cleaner" mechanism.Geology, Vol. 42, 12, pp. 1107-1110.Europe, SwedenSubduction, microdiamond
DS201512-1938
2015
Malich, K.N., Khiller, V.V., Badanina, I.Yu., Belousova, E.A.Results of dating of thorianite and badeleyite from carbonatites of the Guli massif, Russia.Doklady Earth Sciences, Vol. 464, 2, pp. 1029-1032.RussiaCarbonatite

Abstract: The isotopic -geochronological features of thorianite and baddeleyite from carbonatites of the Guli massif, located within Maimecha -Kotui province in the north of the Siberian Platform, are characterized for the first time. The economic complex platinum-group element (PGE) and gold placer deposits are closely related to the Guli massif. Similar geochronological data for thorianite (250.1 ± 2.9 Ma, MSWD = 0.09, n = 36) and baddeleyite (250.8 ± 1.2 Ma, MSWD = 0.2, n = 6) obtained by two different methods indicate that carbonatites were formed close to the Permian -Triassic boundary and are synchronous with tholeiitic flood basalts of the Siberian Platform.
DS201501-0018
2015
Manson, M.Jacques Cartier's legacy: the Renard diamond project under construction.PDAC 2015, 1p. AbstractCanada, QuebecDeposit - Renard
DS201507-0323
2016
Mantovani, M.S.M., Louro, V.H.A., Ribeiro, V.B., Requejo, H.S., dos Santos, R.P.Z.Geophysical analysis of Catalao 1 alkaline carbonatite complex in Goias, Brazil.Geophysical Prospecting, Vol. 64, pp. 216-227.South America, BrazilDeposit - Catalao
DS201512-1939
2015
Mao, M., Simandl, G.J., Spence, J., Marshall, D.Fluorite trace-element chemistry and its potential as an indicator mineral: evaluation of LA-ICP-MS method.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov. 13-14, pp. 251-264.TechnologyRare earths

Abstract: Fluorite (CaF2) belongs to the isometric system, with a cubic, face-centred lattice. Fluorite commonly forms cubes or octahedrons, less commonly dodecahedrons and, rarely, tetrahexahedrons, trapezohedrons, trisoctahedrons, hexoctahedrons, and botyroidal forms. Fluorite is transparent to translucent, and has vitreous luster. It occurs in a variety of colours including purple, green, blue, or yellow, however it can also be colourless, and can exhibit colour zoning, (Staebler et al., 2006). Fluorite from many localities is fl uorescent (Verbeek, 2006). Fluorite density varies from 3.0-3.6 g/cm3, depending to a large extent on inclusions and impurities in the crystal lattice (Staebler et al., 2006), and its hardness is 4 on Mohs scale (Berry et al., 1983). Many single fl uorite crystals display sector zoning, refl ecting preferential substitution and incorporation of trace elements along successive crystal surfaces (Bosce and Rakovan, 2001). The Ca2+ ion in the fl uorite crystal structure can be substituted by Li+, Na+, K+, Mg2+, Mn2+, Fe2+,3+, Zn2+, Sr2+, Y3+, Zr4+, Ba2+, lanthanides ions, Pb2+, Th4+, and U4+ ions (Bailey et al., 1974; Bill and Calas, 1978, Gagnon et al., 2003; Schwinn and Markl, 2005; Xu et al., 2012; Deng et al., 2014). Concentrations of these impurities do not exceed 1% (Deer, 1965) except in yttrofl uorite (Ca,Y)F2-2.33 and cerfl uorite (Ca,Ce)F2-2.33 (Sverdrup, 1968). Fluorite occurs in a variety of rocks, as an accessory and as a gangue mineral in many metalliferous deposits and, in exceptional cases, as the main ore constituent of economic deposits (Simandl, 2009). Good examples of fl uorite mines are Las Cuevas, Encantada-Buenavista (Mexico); St. Lawrence pluton-related veins and the Rock Candy Mine (Canada); El Hamman veins (Morocco) and LeBurc Montroc -Le Moulinal and Trebas deposits (France) as documented by Ruiz et al. (1980), Grogan and Montgomery (1975), González-Partida et al. (2003), Munoz et al. (2005), and Fulton III and Miller (2006). Fluorite also commonly occurs adjacent to or within carbonatites and alkaline complexes (Kogut et al., 1998; Hagni,1999; Alvin et al., 2004; Xu et al., 2004; Salvi and Williams-Jones, 2006); Mississippi Valley-type (MVT) Pb- Zn-F-Ba deposits; F-Ba-(Pb-Zn) veins (Grogan and Bradbury, 1967 and 1968; Baxter et al., 1973; Kesler et al., 1989; Cardellach et al., 2002; Levresse et al., 2006); hydrothermal Fe (±Au, ±Cu) and rare earth element (REE) deposits (Borrok et al., 1998; Andrade et al., 1999; Fourie, 2000); precious metal concentrations (Hill et al., 2000); fl uorite/metal-bearing skarns (Lu et al., 2003); Sn-polymetallic greissen-type deposits (Bettencourt et al., 2005); and zeolitic rocks and uranium deposits (Sheppard and Mumpton, 1984; Cunningham et al., 1998; Min et al., 2005). Ore deposit studies that document the trace element distribution in fl uorite are provided by Möller et al. (1976), Bau et al. (2003), Gagnon et al. (2003), Schwinn and Markl (2005), and Deng et al. (2014). The benchmark paper by Möller et al. (1976) identifi ed variations in the chemical composition of fl uorites according their origin (sedimentary, hydrothermal, or pegmatitic). Recently, Makin et al. (2014) compiled trace-element compositions of fl uorite from MVT, fl uorite-barite veins, peralkaline-related, and carbonatite-related deposits. They showed that fl uorite from MVT and carbonatite deposits can be distinguished through trace element concentrations, and that the REE concentration of fl uorite from veins is largely independent of the composition of the host rock. Based on the physical and chemical properties of fl uorite, its association with a variety of deposit types, and previous studies, it is possible that fl uorite can be used as a proximal indicator mineral to explore for a variety of deposit types. Unfortunately, the compilation by Makin et al. (2014) contained chemical analyses performed at different laboratories using different analytical techniques (including laser ablation-inductively coupled plasma mass spectrometry (LA-ICP-MS), electron microprobe, neutron activation, and ICP-MS), and precision and accuracy varied accordingly. As an orientation survey, herein we present data from fi ve deposits, with two samples from the Rock Candy deposit (British Columbia), and one sample from each of Kootenay Florence (British Columbia), Eaglet (British Columbia), Eldor (Quebec), and Hastie quarry (Illinois) deposits (Table 1). The main objectives of this study are to: 1) assess variations in chemical composition of fl uorite in the samples and deposit types; 2) evaluate relations between analyses made using laser ablation-inductively coupled plasma mass spectrometry on individual grains [LA-ICP-MS(IG)], and those made using laser ablation-inductively coupled plasma mass spectrometry on fused beads [LA-ICP-MS(FB)] and X-ray fl uorescence (XRF); 3) test the use of stoichiometric Ca content as an internal fl uorite standard, such has been done by Gagnon et al. (2003) and Schwinn and Markl, (2005); 4) select the elements that are commonly present in concentrations above the lower limit of detection of LA-ICP-MS and available for constructing discrimination diagrams; 5) consider if our results agree with the preliminary discrimination diagrams of Makin et al. (2014).
DC201507-1572
2015
Marange Resources PVT Ltd.Marange Resources is now technically insolvent with the companies liabilities exceeding assets by a staggering US$74,7 million.The Independent ( Zimbabwe), June 22, 1p.Africa, ZimbabweNews item - Marange Resources
DC201504-1573
2015
Margaret Lake Diamonds Inc.Announces non-brokered private placement. ( prospect near Gahcho Kue).Margaret Lake Diamonds Inc., Mar. 19, 1p.Canada, Northwest TerritoriesNews item - press release
DC201505-1574
2015
Margaret Lake Diamonds Inc.Closes non-brokered private placement $ 100,620.Margaret Lake Diamonds Inc., Mar. 27, 1p.Canada, Northwest TerritoriesNews item - press release
DC201505-1575
2015
Margaret Lake Diamonds Inc.High priority drill targets defined on Margaret Lake property.Margaret Lake Diamonds Inc., Apr. 20, 1p.Canada, Northwest TerritoriesNews item - press release
DC201508-1576
2015
Margaret Lake Diamonds Inc.Margaret Lake Diamonds Inc. acquisition of 100% interest in Margaret Lake property & land use permit.Margaret Lake Diamonds Inc., July 13, 1p.Canada, Northwest TerritoriesNews item - press release
DS201512-1940
2015
Markwitz, V., Hein, K.A.A., Jessell, M.W., Miller, J.Metallogenic portfolio of the West African Craton. ( mentions kimberlites)Ore Geology Reviews, Oct 28 10.024Africa, West AfricaReguibat shield, Kenema-Man shield

Abstract: The West African Craton hosts major resources of gold, iron ore, aluminium ore, diamonds, phosphates and manganese. This portfolio of ore deposits is linked to the formation of Archean -Paleoproterozoic greenstone belts, Jurassic rifting and extended periods of Mesozoic to Cenozoic weathering and erosion. We give a brief overview of the temporal and spatial distribution patterns of West African ore deposits with emphasis on the main commodity types. The oldest ore forming processes generated major resources in iron ore and gold in the Kénéma -Man and Reguibat Shields during the Neo-Archean. The majority of gold, porphyry copper, lead -zinc and sedimentary manganese deposits formed during the Paleoproterozoic, dominantly within the Baoulé-Mossi domain. At the same time diamond-bearing kimberlites developed in Ghana. Another distinct diamond event has been recognized in the Mesozoic of the Kénéma -Man shield. Isolated occurrences of IOCG's as well as copper -gold and gold formed in Pan-African/Variscan belts. During the Neoproterozoic, the majority of mineralization consists of sedimentary iron ore and phosphate deposits located within intracratonic basins. During the Phanerozoic aluminium ore, phosphates and mineral sands concentrated along the margins of the coastal and intracratonic basins.
DS201510-1784
2015
Markwitz, V., Hein, K.A.A., Miller, J.Compilation of West African mineral deposits: spatial distribution and mineral endowment. ( mentions diamonds)Precambrian Research, in press available, 21p.Africa, Mali, Mauritania, Senegal, Burkina Faso, Ghana, Ivory CoastMetallogeny

Abstract: The West African Craton is highly endowed in minerals, and their spatial and temporal distribution varies from single to multi-phase mineralization events. They are broadly related to three major tectono-metallogenic elements and formed during distinct mineral epochs: (1) In both Archean Shields (Kénéma-Man and Reguibat) and Paleoproterozoic domains (Baoulé-Mossi, Eglab). These are characterized by giant iron ore deposits that formed between ca. 2.5-2.3 Ga, nearly all gold, porphyry copper, lead-zinc and sedimentary manganese ore that developed between 2.2 and 2.1 Ga, and primary diamonds that formed between two intervals at ca. 2.2-2.0 Ga and in the Mesozoic. (2) Across Pan-African and Variscan belts. These are distinguished by major Precambrian IOCG's, copper-gold that formed at ca. 2.1 Ga and approximately 680 Ma, and Neoproterozoic sedimentary iron ore and phosphate deposits. (3) Within intracratonic and coastal basins. These include the development of Cenozoic lateritic bauxites over Mesozoic dolerites, Tertiary/Quaternary mineral sands deposits, oolitic iron ore and sedimentary phosphate deposits. Geological, spatial and temporal correlations using the multi-commodity West African Mineral Deposit Database highlight that gold and non-gold commodities formed in multiple phases. This commenced in the Liberian Orogeny (2.9-2.8 Ga) with the enrichment of iron ore, nickel sulphides, diamonds and gold in the earth's crust. The pre-Eburnean or Tangaean-EoEburnean-Eburnean I Event yielded gold, and the major Eburnean Orogeny yielded gold, iron ore, manganese, diamonds, magmatic nickel sulphides, copper-gold, lead-zinc, and REE minerals. Throughout the Pan-African event sedimentary manganese deposits, lead-zinc, REE minerals, sedimentary phosphates, and again gold were formed. Primary diamonds and magmatic nickel sulphides are related to the break-up of Gondwana, followed by an intense lateritic weathering period that formed bauxite deposits along the craton margin.
DS201505-0255
2015
Marquardt, H., Miyagi, L.Slab stagnation in the shallow mantle linked to an increase in mantle viscosity.Nature Geoscience, Vol. 8, pp. 311-314.MantleSubduction
DS201507-0324
2015
Marques de Morais, R.Blood diamonds: torture and corruption in Angola. IN ENGLISH publ originally in Portugal in 2011.Diamonds.net, English translation 156p. Pdf availableAfrica, AngolaBook
DS201502-0077
2014
Martens, U., Restrepo, J.J., Ordonez-Carmona, O., Correa-Martinez, A.M.The Tahami and Anaconda terranes of the Colombian Andes: missing links between South American and Mexican Gondwana margins.Journal of Geology, Vol. 122, Sept. pp. 507-530.South America, MexicoTectonics
DS201510-1785
2015
Martin, A.P., Price, R.C., Cooper, A.F., McCammon, C.A.Petrogenesis of the rifted southern Victoria Land lithospheric mantle, Antarctica, inferred from petrography, geochemistry, thermobarometry and oxybarometry of peridotite and pyroxenite xenoliths from the Mount Morning eruptive centre.Journal of Petrology, Vol. 56, 1, pp. 193-226.AntarcticaMelting, subduction

Abstract: The lithospheric mantle beneath West Antarctica has been characterized using petrology, whole-rock and mineral major element geochemistry, whole-rock trace element chemistry and Mössbauer spectroscopy data obtained on a suite of peridotite (lherzolite and harzburgite) and pyroxenite xenoliths from the Mount Morning eruptive centre, Southern Victoria Land. The timing of pyroxenite formation in Victoria Land overlaps with subduction of the Palaeo-Pacific plate beneath the Gondwana margin and pyroxenite is likely to have formed when fluids derived from, or modified by, melting of the subducting, eclogitic, oceanic crustal plate percolated through peridotite of the lithospheric mantle. Subsequent melting of lithospheric pyroxenite veins similar to those represented in the Mount Morning xenolith suite has contributed to the enriched trace element (and isotope) signatures seen in Cenozoic volcanic rocks from Mount Morning, elsewhere in Victoria Land and Zealandia. In general, the harzburgite xenoliths reflect between 20 and 30% melt depletion. Their depleted element budgets are consistent with Archaean cratonization ages and they have mantle-normalized trace element patterns comparable with typical subcontinental lithospheric mantle. The spinel lherzolite mineral data suggest a similar amount of depletion to that recorded in the harzburgites (20-30%), whereas plagioclase lherzolite mineral data suggest <15% melt depletion. The lherzolite (spinel and plagioclase) xenolith whole-rocks have compositions indicating <20% melt depletion, consistent with Proterozoic to Phanerozoic cratonization ages, and have mantle-normalized trace element patterns comparable with typical depleted mid-ocean ridge mantle. All peridotite xenoliths have undergone a number of melt-rock reaction events. Melting took place mainly in the spinel peridotite stability field, but one plagioclase peridotite group containing high-sodium clinopyroxenes is best modelled by melting in the garnet field. Median oxygen fugacity estimates based on Mössbauer spectroscopy measurements of spinel and pyroxene for spinel-facies conditions in the rifted Antarctic lithosphere are -0·6 ?log fO2 at Mount Morning and –1·0 ± 0·1 (1?) ?log fO2 for all of Victoria Land, relative to the fayalite-magnetite-quartz buffer. These values are in good agreement with a calculated global median value of -0·9 ± 0·1 (1?) ?log fO2 for mantle spinel-facies rocks from continental rift systems.
DM201502-0896
2015
Marus, Y.The Argyle diamond phenomenon. Analysis of all Argyle tenders.leibish.com, Jan. 25, 11p.AustraliaNews item - Argyle
DS201504-0207
2014
Masselot, M.J.Diamants noirs polycrusallns rencontres en joaillerie.Thesis, 'Diplome D'Universite de Gemmologie devant l'Universite de Nantes U.F.R. des Sciemces et des Techniques, April , 55p. AvailableTechnologyBlack diamond
DS201510-1786
2015
Massuyeau, M., Gardes, E., Morizet, Y., Gaillard, F.A model for the activity of silica along the carbonatite-kimberlite-mellilitite-basanite melt compositional joint.Chemical Geology, Vol. 418, pp. 206-216.TechnologyKimberlite

Abstract: Carbon dioxide and water, being present in the Earth's mantle at concentration levels of tens to hundreds of ppm, greatly lower the peridotite solidus temperature and drastically modify the composition of produced melts. The presence of CO2 produces silica-poor, carbonate-rich liquids at the onset of melting, and these liquids shift toward silica rich compositions as the degree of melting increases. Numerous geochemical observations and experimental studies have revealed the complexity of the transition between carbonate-rich and silicate-rich melts. It is characterized by a strongly non-linear evolution and, under specific conditions, by immiscibility. To better constrain this transition, we have used the thermodynamic activity of silica as a probe of the mixing properties between molten carbonate and molten silicate. The activity of silica (aSiO2(l))aSiO2l was calculated for a large number of experimental liquids from two equilibria: olivine-orthopyroxene-melt and immiscible silicate-rich melt-carbonate-rich melt (491 data points ranging from 1 to 14 GPa and 1090 to 1800 °C). We modelled aSiO2(l)aSiO2l during incipient melting of the peridotite in presence of CO2 with a generalized Margules function. Our model reproduces well the silica activity-composition relationships of the experimental database, and can be used to predict the silica content of the melts coexisting with olivine and orthopyroxene. We show that water content and Ca/Mg ratio in the melts have an important influence on the aSiO2(l)aSiO2l. In contrast to a recent empirical model (Dasgupta et al., 2013), the analysis of the experimental database reveals that the transition from carbonate to silicate melt with decreasing depth should occur abruptly in oceanic mantle. Our model predicts that carbonatitic melts with ~ 5 wt.% SiO2 can be stabilized from ~ 150 km depth, at the onset of incipient melting by "redox melting", up to ~ 75 km, above which the liquid evolves abruptly to a carbonated silicate composition (> ~ 25 wt.% SiO2). In the cratonic mantle lithosphere, our model predicts that carbonatitic melts are prevailing up to shallow depth, and conflicts the recent model (Russell et al., 2012) of CO2-saturation triggered by orthopyroxene assimilation during kimberlite ascent.
DS201501-0019
2015
Masy, J., Niu, F., Levander, A., Schmitz, M.Lithospheric expression of cenozoic subduction, mesozoic rifting and the Precambrian shield in Venezuela.Earth and Planetary Science Letters, Vol. 410, pp. 12-24.South America, VenezuelaSubduction
DS201512-1941
2015
Mather, A.E., Mills, S., Stokes, M., Fyfe, R.Ten years on: Google Earth offer the geoscience community?Geology Today, Vol. 31, 6, pp. 216-221.TechnologyGoogle Earth

Abstract: Google Earth has been part of most geoscientists' computer (and mobile) desktops for a decade, and this year Google Earth Professional has become freely available to all with a universal license key. Many users are still, however, not aware of the full potential that it can offer across a range of teaching and research areas in the geosciences. Here a pragmatic look is taken at some of the current key uses in terms of resources and applications and how they can help in research and training educational roles in the geosciences.
DS201512-1942
1989
McCandless, T.E.Microdiamonds from the Sloan 1 and 2 kimberlites, Colorado, USA.28th International Geological Congress, Washington DC, Workshop on Diamonds, extended abstracts, pp. 44-46.United States, Colorado PlateauMicrodiamonds
DS201512-1943
1999
McCandless, T.E., Letendre, J., Eastoe, C.J.The morphology and carbon isotope chemistry of microdiamonds from the Dachine Diamondiferous body, French Guiana.Proceedings of rhe 7th International Kimberlite Conference, Vol. 2, pp. 550-556.South America, French GuianaMicrodiamonds
DS201512-1944
1994
McCandless, T.E., Waldman, M.A., Gurney, J.J.Macro- and microdiamonds from Arkansas lamproites: morphology, inclusions and isotope geochemistry.Proceedings of the 5th. International Kimberlite Conference, Vol. 2, pp. 78-97.United States, ArkansasMicrodiamonds

Abstract: The first report of diamond in igneous rock in the United States originated at Prairie Creek, Arkansas. We have examined the morphological, carbon isotope, and inclusion characteristics of diamonds from Prairie Creek, and from the Twin Knobs # 1, #2, Black Lick, and American lamproites. White is the most common macrodiamond color at Prairie Creek (62% of total), with 20% brown and 16% yellow. This contrasts with Australian lamproites where brown predominates, and with other North American localities such as the Sloan, Colorado kimberlites where yellow is rare. Lamination lines indicate ductile deformation at mantle conditions. The macrodiamonds are very resorbed; 82% are equiform or distorted tetrahexahedroida and none are octahedra. Low relief surfaces indicate prolonged and/or intense resorption. Microdiamonds differ dramatically, with octahedra and fragn~ents common and tetrahexahedroida abscnL Serrate laminae, knob-like asperities, pointed plates, ribbing, and non-uniform resorption are the most common surface features. Diamonds from the Twin Knobs # 1 lamproite are similar to microdiamonds with respect to size and surface features. Magnetite and olivine (F093) are the only primary inclusions foqnd in the diamonds, although inclusions of peridotitic and eclogitic parageneses have been reported in previous studies. Carbon isotope B13c values for Prairie Creek macrodiamonds peak at-3.0 to -6.2 %o (ave. -4.7 %o for 19 stones) and -10.3 to -10.6 %o (ave. -10.5 %o for 2 stones). The diamonds with magnetite and olivine inclusions have B13c values of -5.1 %o and -4.0 %o respectively. Microdiamonds from Prairie Creek, Twin Knobs #2, American, and Black Lick are similar to Prairie Creek macrodiamonds ( -0.5 to -7 .8; ave. -4.1 %o for 8 stones). A Prairie Creek and a Black Lick microdiamond have B13c values of -26.1 and -25.2%orespectively, and the latter exhibits non-uniform resorption. Lamination lines on macrodiamonds and xenocrystic surface features on microdiamonds imply that both are xenocrysts in lamproite. Carbon isotopes are characteristic of a peridotitic or primordial carbon reservoir. Two 13cdepleted microdiamonds may be from a subducted carbon source. In comparison to macrodiamond populations from most kimberlites, Prairie Creek macrodiamonds are intensely resorbed, and lamproite may be more corrosive than kimberlite \\ ith respect to diamond resorption. Microdiamonds were probably encapsulated in xenolith material ani.! esca•,)ed resorption. The differences in size and color of Prairie Creek macrodiamonds relative to Sloan kimberlitic diamonds are genetic, and may be related to their formation in lithosphere of differing age and tectonic history.
DS201504-0208
2015
McGuiness, L.P., Jelezko, F.Look but don't touch the metals.Science, Vol. 347, 6226, pp. 1073-1074 Mar. 6.TechnologyMetal conductivity, atomic defects in diamond
DS201509-0416
2015
McKenzie, D., Daly, M.C., Priestley, K.The lithospheric structure of Pangea.Geology, Vol. 43, 9, pp. 783-786.MantlePangea

Abstract: Lithospheric thickness of continents, obtained from Rayleigh wave tomography, is used to make maps of the lithospheric thickness of Pangea by reconstructing the continental arrangement in the Permian. This approach assumes that lithosphere moves with the overlying continents, and therefore that the arrangement of both can be obtained using the poles of rotation obtained from magnetic anomalies and fracture zones. The resulting reconstruction shows that a contiguous arc of thick lithosphere underlay most of eastern Pangea. Beneath the western convex side of this arc, there is a wide belt of thinner lithosphere underlying what is believed to have been the active margin of Pangea, here named the Pangeides. On the inner side of this arc is another large area of thin lithosphere beneath the Pan-African belts of North Africa and Arabia. The arc of thick lithosphere is crossed by bands of slightly thinner lithosphere that lie beneath the Pan-African and Brasiliano mobile belts of South America, Africa, India, Madagascar, and Antarctica. This geometry suggests that lithospheric thickness has an important influence on continental deformation and accretion.
DS201512-1945
2015
McKillop, R.J., Sacco, D.A.Using property scale surficial geology mapping to refine kimberlite indicator mineral dispersal patterns at the Redemption project, NWT.43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 64.Canada, Northwest TerritoriesDeposit - Redemption

Abstract: Surficial sediment (e.g., till) sampling is an effective tool for mineral exploration in the glaciated landscapes of Canada. Dispersal patterns identified through surficial sampling are studied and used to identify their smaller, mineralized bedrock sources. Data compiled from multiple sampling programs, such as those included in the Kimberlite Indicator and Diamond Database (KIDD), can produce misleading dispersal patterns due to variability in sampling and analysis protocols. The accurate delineation of dispersal patterns requires an understanding of the genesis, comparability and distribution of sediment samples on which the dispersal patterns are based. Using an example from a recent study of the South Coppermine indicator mineral train on the Redemption Project, we demonstrate a method for reducing the variability in the data set that utilizes property-scale surficial geology mapping to systematically filter and normalize the data. The surficial geology mapping identified the nature and distribution of sediments, as well as specific till units that have been reworked to differing degrees by a combination of glacial meltwater, modern drainage and periglacial processes, which can affect the concentration of kimberlite indicator minerals (KIMs). A derivative map depicting till sampling suitability based on basal till potential and the level of reworking was used to classify and group samples into subset populations, from which less-favourable samples were filtered. KIM counts in the remaining sample data were then leveled (normalized) according to the thickness of the sampled till unit to reduce the bias produced by higher anomalies common to thin till units. The filtered and normalized data produced a sharper, more accurate KIM dispersal pattern and a new basis for interpreting possible provenance envelopes, from which lower-risk exploration targets can be identified.
DS201512-1946
2015
McKillop, R.J., Turner, D.G., Sacco, D.A.Quaternary geology interpretation for the Slave surficial materials and permafrost study.43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 65.Canada, Northwest TerritoriesGeomorphology

Abstract: The Northwest Territories Geological Survey recently funded a strategic overburden drilling program in the Lac de Gras (NTS 076D) and Alymer Lake (NTS 076C) map areas of the Slave Province, Northwest Territories. This program was designed to help stimulate mineral exploration, and to collect permafrost and geotechnical data required for future infrastructure development. To provide guidance for the drill program and a basis for interpreting the results, we compiled, analyzed and interpreted an unprecedented collection of privately-collected and public data. The data set included extensive LiDAR-derived hillshade models; regional surficial and bedrock geology mapping; and mineralogical, geochemical, grain size and sample description data from surface sediment (till) samples. Our systematic mapping of the LiDAR coverage area resulted in the identification of 649 linear features, including eskers, meltwater channels, moraines, paleo-shorelines and streamlined bedforms, which strengthened understanding of local ice flow histories and patterns of deglaciation. Based on a comprehensive review and re-evaluation of the data, we identified six important trends: (1) samples collected from till blankets have lower indicator mineral counts than those collected from till veneers and thick, hummocky till deposits; (2) indicator mineral counts from glaciofluvial sediments were lower and show more subtle anomalies than those from till; (3) the =0.5 mm size-fraction in the mineralogy data set has ~25-40% higher indicator mineral counts than the >0.5 mm size-fraction; (4) when comparing the analytical results of different size fractions, Cr and La concentrations are higher in the clay-sized fraction, while Ba concentrations are higher in the silt- and clay-sized fraction; (5) anomalous Au concentrations in the northern portion of the study area likely represent a lithological change and subsequent glacial dispersion, rather than significant mineralization; and (6) local variations in pyrope and Cr-diopside counts in the study area may affect interpretations of kimberlite indicator mineral dispersal plumes. We also delineated 60 areas of interest that present unique research opportunities, or represent important data gaps that compromise the understanding of glacial history, mineral dispersal and permafrost conditions within the region.
DS201512-1947
2015
McLachlan, C.Diavik mine operational update.43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 66.Canada, Northwest TerritoriesDeposit - Diavik

Abstract: Since 2003 Diavik Diamond Mines Inc. has been mining diamonds from kimberlite pipes located below the waters of Lac de Gras. Diavik produces 6-7 million carats annually and in 2012 Diavik transitioned to a fully underground mine. Diavik’s 9.2 megawatt award winning wind farm has confirmed Diavik as a leader in cold climate, off grid renewable energy. Diavik recently began construction on its A21 project, which will bring its fourth kimberlite pipe into production in 2018. This presentation will provide an operational update on the amazing Diavik operation.
DS201512-1948
2015
McLeod, W., Coyne, P.Challenges and triumps on the Inuvik to Tuktoyaktuk highway.43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 66.Canada, Northwest TerritoriesIce road

Abstract: The Inuvik to Tuktoyaktuk Highway (ITH) has been an idea for over 50 years. It was only in the past decade that the project gained traction towards becoming a reality. Once constructed, the ITH will be an all-weather link between these two communities in the Mackenzie Delta region of the Northwest Territories. Working collaboratively with our aboriginal partnership company KAVIK-STANTEC in Inuvik, Stantec has completed a variety of tasks ranging from baseline environmental assessment (wildlife, vegetation, and terrain), regulatory support and civil engineering design services. Crews hit the ground in the winter of 2013/2014 and the project is now entering its third and final winter construction season. The project team (designers, constructors and the Owner) contended with several challenges in bringing the project to fruition. Some of these included: • Fast track schedule • Weather constraints • Data refinements • Climate change considerations • Large complexity of the project (requiring collaborative approach) When completed, the ITH will span over 140 km and provide a vital access route for industry and the public. Stantec will discuss the challenges and triumphs in working on this diverse project working in this remote landscape.
DS201510-1787
2015
McManus, C.E., Dowe, J., McMillan, N.J.Determination of diamond provenance is possible with multivariate analysis of LIBS spectra. ( Laser Induced Breakdown Spectroscopy)GSA Annual Meeting, Paper 300-4, 1p. Abstract only BoothTechnologySpectroscopy

Abstract: The ability to accurately determine the provenance of gem diamonds impacts economic, political, and national security arenas. Currently, provenance determinations rely on: 1) gemological and mineralogical features of stones, such as spectroscopic measurements, geochemistry, and inclusions, and 2) certification and tracking of individual stones through the Kimberly Process Certificate Scheme. Unfortunately, during cutting and polishing, many gemological features are obliterated and tracking individual stones through the chain of custody can be difficult. This study resulted in a highly successful method for determining provenance of cut diamonds from information in the stone itself. A set of 30 cut diamonds from each of ten controlled localities and one set of 30 synthetic diamonds were analyzed by Laser-Induced Breakdown Spectroscopy (LIBS). The sample set (330 total diamonds) includes both kimberlite and placer diamonds from five countries and five different cratons. LIBS acquires the atomic emission spectra released from a material during laser ablation. The spectra contain information from nearly every element in the periodic table, and thus are unique chemical, or quantagenetic, signatures of the material. Spectra were analyzed using a Bayesian statistical method that compares groups of samples defined by the reported locations of the stones to clusters of samples defined by spectral similarity. Ideally, each spectral cluster coincides with a group of stones. The spectrum of each sample is compared to a set of reference spectra from each group to determine the probable provenance of the sample. The correlation between groups and clusters was excellent, with average accuracy of 98%, suggesting that diamonds from each location are spectrally similar to each other and distinct from those from other locations. This is true even for diamonds from kimberlites in close proximity to each other. Synthetic diamonds are easily distinguished from natural diamonds (100% success). Some groups of diamonds in the study are more heterogeneous than others. For instance, a placer group has five recognizable spectrally-defined sub-clusters. This work demonstrates that diamond provenance can be determined at a high level of confidence on individual cut gemstones.
DS201512-1949
2015
McManus, C.E., Dowe, J., McMillan, N.J.Determination of diamond provenance is possible with multivariate analysis of LIBS spectra.Materialytics.com, Available from c.McManus @materialytics.com 1 poster ( 4 parts)GlobalLaser Induced Breakdown Spectroscopy

Abstract: The ability to accurately determine the provenance of gem diamonds impacts economic, political, and national security arenas. Currently, provenance determinations rely on: 1) gemological and mineralogical features of stones, such as spectroscopic measurements, geochemistry, and inclusions, and 2) certification and tracking of individual stones through the Kimberly Process Certificate Scheme. Unfortunately, during cutting and polishing, many gemological features are obliterated and tracking individual stones through the chain of custody can be difficult. This study resulted in a highly successful method for determining provenance of cut diamonds from information in the stone itself. A set of 30 cut diamonds from each of ten controlled localities and one set of 30 synthetic diamonds were analyzed by Laser-Induced Breakdown Spectroscopy (LIBS). The sample set (330 total diamonds) includes both kimberlite and placer diamonds from five countries and five different cratons. LIBS acquires the atomic emission spectra released from a material during laser ablation. The spectra contain information from nearly every element in the periodic table, and thus are unique chemical, or quantagenetic, signatures of the material. Spectra were analyzed using a Bayesian statistical method that compares groups of samples defined by the reported locations of the stones to clusters of samples defined by spectral similarity. Ideally, each spectral cluster coincides with a group of stones. The spectrum of each sample is compared to a set of reference spectra from each group to determine the probable provenance of the sample. The correlation between groups and clusters was excellent, with average accuracy of 98%, suggesting that diamonds from each location are spectrally similar to each other and distinct from those from other locations. This is true even for diamonds from kimberlites in close proximity to each other. Synthetic diamonds are easily distinguished from natural diamonds (100% success). Some groups of diamonds in the study are more heterogeneous than others. For instance, a placer group has five recognizable spectrally-defined sub-clusters. This work demonstrates that diamond provenance can be determined at a high level of confidence on individual cut gemstones.
DC201503-1577
2015
MDN Inc.MDN acquires 20 blocks of high grade niobium claims in Ontario. Prairie Lake ( alkaline)MDN Inc., Feb. 24, 1p.Canada, OntarioNews item - press release
DC201505-1578
2015
MDN inc.MDN acquires 20 blocks of high grade niobium claims in Ontario. ( Prairie Lake carbonatite)MDN Inc., Feb. 24, 1p.Canada, OntarioNews item - press release
DC201506-1579
2015
MDN Inc.Prospecting work begins on Prairie Lake. MDN Inc., May 27, 1p.Canada, OntarioNews item - press release
DS201511-1863
2015
Meissner, R., Ramasar, V.Governance and politics in the upper Limpopo River basin, South Africa.Geojournal, Vol. 80, 5, pp. 689-709.Africa, South AfricaMentions Venetia

Abstract: Everyday international political economy (EIPE) offers an opportunity to rethink the role of individuals and citizenry in shaping governance of natural resources. In South Africa, significant progress has been made by government in re-shaping water governance since the end of apartheid in the early 1990s. The role of government in water governance and water politics has thus been emphasised to a large degree. This study looks at historical material to assess the role that water politics and EIPE has played in shaping the use and management of water resources in the country. Case studies are analysed of two quaternary catchments, A63E and A71L in the Limpopo River Basin, to show how everyday actions by different actors has shaped the current waterscape in the basin. Four events, namely, the politics of the Middle Iron Age State at Mapungubwe; the development of the Mapungubwe National Park and World Heritage Site; the management of water for the De Beers Venetia Diamond Mine; and the establishment of the Coal of Africa Limited colliery are discussed in terms of the agential power at play during each event. The conclusions of the study are that EIPE and reflexive agential power are important factors in water governance that can sometimes be ignored through neoliberal institutionalism. In the current and future governance of water in South Africa they can offer an alternative view of the role and importance of actors and pathways for development.
DS201503-0160
2015
Menezes Filho, L.A.D., Atencio, D., Andrade, M.B., Downs, R.T., Chaves, M.L.S.C., Romano, A.W., Scholz, R., Persiano, A.I.C.Pauloabibite, trigonal NaNbO3, isostructural with ilmenite, from the Jacupiranga carbonatite, Cajati, Sao Paulo, Brazil.American Mineralogist, Vol. 100, pp. 442-446.South America, BrazilCarbonatite
DC201502-1580
2015
Merlin Diamonds LimitedBlumont Group drops its takeover bid.Merlin Diamonds, Jan. 16, 1/2p.AustraliaNews item - press release
DC201504-1581
2015
Merlin Diamonds Limited$4.5 million R & D refund brings Merlin Diamond mine closer to production.Merlin Diamonds Limited, Mar. 19, 1p.AustraliaNews item - press release
DC201506-1582
2015
Merlin Diamonds LimitedMerlin mine - mining operations and exploration update.Merlin Diamonds Limited, Apr. 30, 2p.AustraliaNews item - press release
DC201509-1583
2015
Merlin Diamonds LimitedMerlin diamond project .. Mechanical clamshell grab mining ( barge).Merlin Diamonds Limited, July 30, 14p.AustraliaNews item - press release
DC201512-2443
2015
Merlin Diamonds LimitedMerlin mine - final design of barge and gantry mining.Merlin Diamonds Limited, Oct. 30, 1p. HighlightsAustraliaNews item - press release
DC201505-1584
2015
Metalex Ventures Ltd.U2 kimberlite bulk sample permitting complete.Metalex Ventures Ltd., Apr. 21, 2p.Canada, Ontario, AttawapiskatNews item - press release
DC201504-1588
2015
Meteoric Resources NLQuarterly report: Webb project.Meteoric Resources NL., Mar. 12, 1p.AustraliaNews item - press release
DC201505-1585
2015
Meteoric Resources NLWebb exploration update 51 kimberlite bodies… Type 1 ( no microdiamonds determined as yet)Meteoric Resources NL, Mar. 26, 4p.AustraliaNews item - press release
DC201506-1586
2015
Meteoric Resources NLDiamond anomaly reinforced at Webb. Kimberlite clusterMeteoric Resources NL, Apr. 23, 11p.AustraliaNews item - press release
DC201509-1587
2015
Meteoric Resources NLWebb project update Quarterly report.Meteoric Resources NL, July 30, 9p.AustraliaNews item - press release
DC201512-2444
2015
Meteoric Resources NLWebb diamond joint venture update. Microdiamond samplesMeteoric Resources nl, Oct. 28, 1p. HighlightsAustraliaNews item - press release
DS201510-1788
2015
Michelfelder, G.S., Karfunkel, J., Fernandes, A.F., Sgarbi, N.C., Hoover, D.B., Krambrock, K., Walde, D.Surface source of Coromandel diamonds ( Minas Gerais State), Brazil) and their possible origin from the Serra Negra/Salitre supervolcano.GSA Annual Meeting, Paper 300-1, 1p. Abstract only BoothSouth America, Brazil, Minas GeraisDeposit - Coromandel

Abstract: The origin of diamonds in the Coromandel area has been an enigma for many years, in spite of high investment in conventional and high tech prospecting methods by major mining companies for over half a century. The authors review the history, and then discuss the two principal hypotheses to explain the source of these alluvial diamonds. After mapping the headwater region of one of the richest alluvial diamond rivers, the Santo Antônio do Bonito River, they reject both principal hypotheses and conclude that the surficial source can be only the Upper Cretaceous Capacete Formation, composed of pyroclastics and epiclastics. Based on geophysical data from the literature, combined with field observations the authors suggest that the largest alkaline complex, situated within the diamond producing area, the Serra Negra/Salitre Complex has been the primary source for those pyroclastics of the Capacete Formation and the diamonds. The plugs of this complex are 15-30 times deeper than average kimberlites and other alkaline complexes in the region, and its excess of volume of the intrusive is three orders of magnitude larger than a typical kimberlite. With an intrusive volume of over 1000 km3 the complex is suggested to be a possible supervolcano. This explains the vast areal distribution of the pyroclastics and diamonds. This new hypothesis has advantages and disadvantages, some of them discussed in the paper and leading to the conclusion that further research is needed.
DS201502-0078
2014
Midende, G., Boulvais, P., Tack, L., Melcher, F., Gerdes, A., Dewaele, S., Demaiffe, D., Decree, S.Petrography, geochemistry and U-Pb zircon age of the Matongo carbonatite Massif ( Burundi): implication for the Neoproterozoic geodynamic evolution of Central Africa.Journal of African Earth Sciences, Vol. 100, pp. 656-674.Africa, BurundiCarbonatite
DS201507-0325
2015
Mikhailova, J.A., Kalashnikov, A.O., Sokharev, V.A., Pakhomovsky, Y.A., Konopleva, N.G., Yakovenchuk, V.N., Bazai, A.V., Goryainov, P.M., Ivanyuk, G.Yu.3D mineralogical mapping of the Kovdor phoscorite-carbonatite complex, Russia.Mineralium Deposita, In press available. 19p.RussiaCarbonatite
DS201502-0079
2015
Mikhno, A.O., Korsakov, A.V.Carbonate, silicate, and sulfide melts: heterogeneity of the UHP mineral forming media in calc-silicate rocks from the Kokchetav massif.Russian Geology and Geophysics, Vol. 56, 1-2, pp. 81-99.Russia, KazakhstanKokchetav massif
DS201502-0080
2014
Milan, R.The mineralogical system: 2 D projections and their potential in mineral identification.European Journal of Mineralogy, Vol. 26, 6, pp. 703-710.TechnologyMineralogy
DS201507-0326
2015
Milani, S., Nestola, F., Alvaro, M., Pasqual, D., Mazzucchelli, M.L., Domeneghetti, M.C., Geiger, C.A.Diamond -garnet geobarometry: the role of garnet compressibility and expansivity.Lithos, Vol. 227, pp. 140-147.TechnologyGeobarometry
DS201501-0020
2014
Mildragovic, D., Francis, D., Weis, D., Constantin, M.Neoarchean ( c.2.7Ga) plutons of the Ungava craton, Quebec, Canada: parental magma compositions and implications for Fe-rich mantle source regions.Journal of Petrology, Vol. 55, 12, pp. 2481-2512.Canada, QuebecMelting
DS201511-1864
2015
Milidragovic, D., Francis, D.Ca. 2.7 Ga ferropicrite magmatism: a record of Fe-rich heterogeneities during Neoarchean global mantle melting.Geochimica et Cosmochimica Acta, in press available 20p.Canada, Ontario, QuebecUngava craton

Abstract: Although terrestrial picritic magmas with FeOTOT ?13 wt.% are rare in the geological record, they were relatively common ca. 2.7 Ga during the Neoarchean episode of enhanced global growth of continental crust. Recent evidence that ferropicritic underplating played an important role in the ca. 2.74–2.70 Ga reworking of the Ungava craton provides the impetus for a comparison of ca. 2.7 Ga ferropicrite occurrences in the global Neoarchean magmatic record. In addition to the Fe-rich plutons of the Ungava craton, volumetrically minor ferropicritic flows, pyroclastic deposits, and intrusive rocks form parts of the Neoarchean greenstone belt stratigraphy of the Abitibi, Wawa, Wabigoon and Vermillion domains of the southern and western Superior Province. Neoarchean ferropicritic rocks also occur on five other Archean cratons: West Churchill, Slave, Yilgarn, Kaapvaal, and Karelia; suggesting that ca. 2.7 Ga Fe-rich magmatism was globally widespread. Neoarchean ferropicrites form two distinct groups in terms of their trace element geochemistry. Alkaline ferropicrites have fractionated REE profiles and show no systematic HFSE anomalies, broadly resembling the trace element character of modern-day ocean island basalt (OIB) magmas. Magmas parental to ca. 2.7 Ga alkaline ferropicrites also had high Nb/YPM (>2), low Al2O3/TiO2 (<8) and Sc/Fe (-3 × 10?4) ratios, and were enriched in Ni relative to primary pyrolite mantle-derived melts. The high Ni contents of the alkaline ferropicrites coupled with the low Sc/Fe ratios are consistent with derivation from olivine-free garnet-pyroxenite sources. The second ferropicrite group is characterized by decisively non-alkaline primary trace element profiles that range from flat to LREE-depleted, resembling Archean tholeiitic basalts and komatiites. In contrast to the alkaline ferropicrites, the magmas parental to the subalkaline ferropicrites had flat HREE, lower Nb/YPM (<2), higher Al2O3/TiO2 (8-25) and Sc/Fe (-4 × 10?4) ratios, and were depleted in Ni relative to melts of pyrolitic peridotite; suggesting they were derived from garnet-free peridotite sources. Neodymium isotopic evidence indicates that the source of alkaline ferropicrites was metasomatically enriched shortly before magma generation (-3.0 Ga), but the subalkaline ferropicrites do not show evidence of precursor metasomatism. The metasomatic enrichment of the alkaline ferropicrite sources may have been accompanied by conversion of Fe-rich peridotite to secondary garnet-pyroxenite. Melting experiments on "pyrolitic" compositions and consideration of the dependence of the density of silicate liquids on pressure and temperature, suggest that ferropicrites cannot originate by melting of normal terrestrial mantle (Mg-number = 0.88-0.92) at high pressures and temperatures. The geochemical similarity between the subalkaline ferropicrites and the shergottite-nakhlite-chassigny (SNC) and howardite-eucrite-diogenite (HED) differentiated meteorites suggests, however, that the Fe-rich mantle may originate from the infall of Fe-rich chondritic meteorites. The occurrence of ca. 2.7 Ga Fe-rich rocks on at least six cratons that are commonly coeval with the more ubiquitous komatiites and Mg-tholeiites is consistent with the existence of heterogeneous Fe-rich "plums" throughout the Neoarchean mantle. The paucity of ferropicrites in the post-2.7 Ga geological record suggests that majority of these Fe-rich plums have been melted out during the global Neoarchean melting of the mantle.
DS201512-1950
2015
Miller, R.R.Pantellerite hosted rare earth element mineralization in southeast Labrador: the Foxtrot deposit.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov. 13-14, pp. 109-118.Canada, LabradorRare earths

Abstract: The Foxtrot rare earth element (REE) deposit is hosted by peralkaline volcanic rocks, primarily pantellerite and commendite fl ows and ash-fl ow tuffs, of the Fox Harbour Volcanic belt in southeast Labrador, near the coastal community of St Lewis (Fig. 1). Search Minerals personnel discovered the deposit in 2010 as a result of a REE exploration program in southeast Labrador. Exploration diamond drilling in late 2010, 2011, and early 2012, totalling 72 diamond-drill holes and 18,855 metres, outlined a Dy-Nd-Y-Tb deposit of 9.2 million tonnes indicated resource (cut-off 130 ppm Dy), grading 189 ppm Dy, 1442 ppm Nd and 1040 ppm Y, and, 5.2 million tonnes inferred resource, grading 176 ppm Dy, 1233 ppm Nd, and 974 ppm Y (Table 1; Srivastava et al., 2012, 2013). A smaller highgrade resource (HGC) was also defi ned (Table 1) and was the subject of a Preliminary Economic Assessment (Srivastava et al., 2013). The Foxtrot deposit and the Fox Harbour Volcanic belt have been the target of continued REE exploration and the subject of engineering and metallurgical studies (Srivastava et al., 2012, 2013; Search Minerals 2014, 2015b) to evaluate the possibility of developing a REE mine at Foxtrot and a REE processing plant in the St. Lewis area (Fig. 1). Herein we outline the geology and mineralization of the Foxtrot REE deposit and develop a preliminary exploration model for REE mineralization in the Fox Harbour Volcanic belt and related belts in southeast Labrador.
DS201512-1951
2015
Miller, V.S., Naeth, M.A.Development of soils and plant communities for reclamation in northern diamond mines.43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 68.Canada, Northwest TerritoriesReclamation

Abstract: Reclamation research in the north over the past 30 years has primarily focused on oil and gas and transportation corridor disturbances. Among industries, disturbances caused by infrastructure and transportation corridors are similar. However, each industry has its unique by products that determine which reclamation methods are most appropriate to achieve end land use goals and the relative ease of reclamation. The purpose of this research program is to develop methods to enhance revegetation of disturbed sites at diamond mines in the north, in particular to create soil like substrates on sites where soil has been removed with the use of onsite and commercial materials and to reestablish a diverse native plant community. Reclamation substrates include by products from the diamond mining process like crushed rock, till/lake sediment, processed kimberlite and various combinations of till/lake sediment and processed kimberlite. Greenhouse experiments were also conducted at the University of Alberta to test a range of substrates and amendments with potential to aid reclamation in the field. In 2013 and 2014, research sites were established at Diavik Diamond Mine using the best performing substrates to determine the effect of micro topography, addition of organic matter and erosion control on native grass and forb establishment; effective moss propagation techniques and; effective lichen propagation methods. Preliminary results and observations from completed greenhouse experiments and the first two growing seasons will be discussed. This research directly enhances knowledge and sustainability of northern regions. It will lead to recommendations for enhanced reclamation protocols to be used by industry and government in the north.
DS201512-1952
2015
Milligan, R., Fedortchouk, Y., Normandeau, P.X., Fulop, A.Comparative study of composition and occurrence of apatite in Snap Lake and Ekati kimberlites.43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 69.Canada, Northwest TerritoriesDeposit - Snap Lake, Ekati

Abstract: Kimberlites are volcanic ultra-potassic rocks present mostly in cratonic settings and some are diamond bearing. Kimberlite magma is derived from the upper mantle, however, its primary composition is still unknown. Assimilation of mantle and crustal material, loss of volatiles during eruption and high degree of alteration all result in variable compositions of kimberlite magma reaching the surface. Studies have shown that kimberlitic fluid has a significant effect on the quality and preservation of diamonds carried to the surface. By better understanding the primary composition of kimberlites, and the processes that drive kimberlite eruption, we can attempt to gain some diagnostic knowledge of the economic viability of a particular kimberlite. Apatite is a common mineral in kimberlite, which composition is sensitive to volatiles and the presence of magmatic fluid. This study will look at the variation of apatite in kimberlites, how different geology indicates their different fluid histories, and the potential for using apatite as an indicator of fluid content and composition in kimberlite magma. The study uses polished sections from different kimberlite lithologies within the Snap Lake kimberlite and from six Ekati Mine kimberlites. Apatite grains were examined using scanning electron microscope (back scatter imaging) and composition was obtained with wavelength-dispersive spectroscopy mode of electron-microprobe analyzes. Snap Lake is a single dyke of coherent kimberlite facies. The dyke intruded in a near-horizontal orientation, and has an average vertical thickness of 2.5 m. There is significant incorporation of crustal material, and the kimberlite is highly altered, possibly a result of interaction with abundant xenoliths. The studied Ekati kimberlites include: two coherent kimberlites - Grizzly and Leslie, and four kimberlites with resedimented volcaniclastic kimberlite facies – Misery, Koala, Panda, and Beartooth. These kimberlites show significant variations in the apatite crystallizing from the melts. At Snap Lake apatite occurs late, interstitially in the groundmass. These anhedral apatites appear to have no zonation, and crystallize around microphenocrysts of olivine and phlogopite. There is also a late component of apatite, possibly associated with carbonate veins that fracture olivine macrocrysts. Sub- to euhedral apatite grains (max 50 µm) crystalize in a carbonate host within a fracture or crack in olivine macrocrysts. In the Ekati kimberlites, apatite is extremely rare to absent in Misery, Panda, and Beartooth kimberlites, but abundant in Grizzly, Koala, and Leslie. Leslie has plenty of euhedral zoned and unzoned apatite associated with monticellite set in carbonate matrix. Grizzly has abundant small (~10 µm) anhedral apatite. Koala contains both anhedral and euhedral apatite, some of which is zoned. The presentation will report the initial results of this study and possible applications for the behavior of volatiles in the studied kimberlite magmas and examine their relationship with the features of the diamond population.
DM201505-0897
2015
MinesiteConroy discussing kimberlite body in FIn land at Seitapera in the Kuhmo district.Minesite.com, Apr. 1, 1p.Europe, FinlandNews item - Karelian Diamonds
DM201506-0898
2015
MinesiteFive Star Diamonds has a 3.5 hectare kimberlite pipe in the Goais region of Brazil. Construction of a pilot plant has commenced.Minesite.com, Apr. 30, 1/4p.South America, BrazilNews item - Five Star
DM201501-0899
2014
MinewebAlrosa to sell more diamonds direct to India.Mineweb.com, Dec. 11, 1/2p.Russia, IndiaNews item - Alrosa
DM201502-2469
2015
minewebRough diamond prices drop.Mineweb.com, Jan. 8, 1p.GlobalNews item - prices
DM201502-2470
2015
MinewebPetra Diamonds sees FY results below market concensus.Mineweb.com, Jan. 26, 1p.Africa, South AfricaNews item - Petra
DM201503-0900
2015
MinewebAlrosa sees moderate growth in 2015 diamond sales.Mineweb.com, Jan. 29, 1p. RussiaNews item - Alrosa
DM201503-0901
2015
MinewebDiamonds are Anglo's best friend.Mineweb.com, Feb. 17, 1p.GlobalNews item - De Beers
DM201507-0902
2015
MinewebBotswana's Okavango diamond sales fall 20%.Mineweb.com, May 28, 1p.Africa, BotswanaNews item - Okavango
DM201509-0903
2015
MinewebCreditors confident as Zimbabwe consolidates Marange diamond fields.Mineweb.com, Aug. 2, 1p.Africa, ZimbabweNews item - Gye Nyame
DM201512-2260
2015
MinewebWhy is beneficiation in the diamond industry failing? Legislation has become a defining feature of the investment regime and is now a liability.Mineweb.com, Oct. 28, 2p.Africa, South Africa, AngolaNews item - beneficiation
DM201512-2261
2015
MinewebRough diamond bubble bust ( Part 1) M. Rapaport.Mineweb.com, Nov. 25, 1/4p.GlobalNews item - rough markets
DM201507-0904
2015
Mining MagazineDebmarine offshore mining vessel gets heavy lift. Johnson Crane Hire has performed heavy lifting for Gariep off shore vessel.Mining Magazine, May 29, 1/4p.Africa, NamibiaNews item - Debmarine
DM201503-0905
2015
Mining ReviewThe lab grown diamond threat - a reality in 10-15 years?Mining Review.com, Feb. 20, 2p.TechnologyNews item - synthetics
DM201506-0906
2015
Mining.comDe Beers paid only $ 226 in royalties for its Ontario mine last year - report. VictorMining.com, May 12, 1p.Canada, OntarioNews item - De Beers
DM201506-0907
2015
Mining.comAlexkor making progress towards sustainability. Production increase from 46,000 to 79,000 carats.Mining.com, May 14, 1/2p.Africa, South AfricaNews item - Alexkor
DM201501-0908
2014
MiningmxZimbabwe, a place of rewards and sanctions.Miningmx.com, Dec. 9, 1/2p.Africa, ZimbabweNews item - legal
DM201502-2471
2015
MiningmxRockwell unveils $C 28.5 m diamond deal.Miningmx.com, Jan. 7, 1p.Africa, South AfricaNews item - Rockwell
DM201503-0909
2015
MiningmxDiamond price weakness 'short lived'. Miningmx.com, Jan. 28, 1p.GlobalNews item - prices
DM201503-0910
2015
MiningmxLace mine to start production in H2.Miningmx.com, Jan. 30, 1/4p.Africa, South AfricaNews item - DiamondCorp
DM201503-0911
2015
MiningmxWomen should become "one of the boys".Miningmx.com, Feb. 17, 1p.GlobalNews item - WIM
DM201504-0912
2015
MiningmxGemfields to add sapphires to product suite. ( emeralds)Miningmx.com, Mar. 11, 1/4p.Africa, Zambia, MozambiqueNews item - Gemfields
DM201504-0913
2015
MiningmxZim diamond miners told to sell 50% in shares.Miningmx.com, Mar. 13, 1p.Africa, ZimbabweNews item - legal
DM201505-0914
2015
MiningmxTimeless De Beers buys priceless time for Anglo.Miningmx.com, Apr. 2, 2p.GlobalNews item - De Beers
DM201505-0915
2015
MiningmxMugabe says indigenisation is 'generous'.Miningmx.com, Apr. 9, 1p.Africa, ZimbabweNews item - legal
DM201505-0916
2015
MiningmxRio's Murowa cut output 61% to avoid tax.Miningmx.com, Apr. 23, 1p.Africa, ZimbabweNews item - Rio Tinto
DM201506-0917
2015
MiningmxState Diamond Trade under attack. Allowed to purchase 10% of local diamond producers run of mine … only managed to buy some 4%.Miningmx.com, May 14, 1p.Africa, South AfricaNews item - SDT
DM201507-0918
2015
MiningmxTrans Hex caps a good year with 10c/s payout. KleinzeeMiningmx.com, June 2, 1p.Africa, South Africa, AngolaNews item - Trans Hex
DM201508-0919
2015
MiningmxDe Beers looks to SA with fresh eyes.Miningmx.com, July 22, 2p.Africa, South AfricaNews item - De Beers
DM201509-0920
2015
MiningmxGemfields dancing a merry jig. Miningmx.com, July 30, 1p.Africa, ZambiaNews item - Gemfields
DM201510-2109
2015
MiningmxMarket misery fetters Botswana ambitions.Miningmx.com, Sept. 11, 3p.Africa, BotswanaNews item - economics
DM201511-2152
2015
MiningmxSA diamond sector dying on the vine. Zlotowski's Diamond Cutting Works intending to close its doors. Miningmx.com, Oct. 6, 2p.Africa, South AfricaNews item - Zlotowski
DM201511-2153
2015
MiningmxDe Beers cuts 2015 production forecast again. Jwaneng and OrapaMiningmx.com, Oct. 25, 1p.Africa, BotswanaNews item - Debswana
DS201507-0327
2015
Mints, M.V.Post collisional lamproites of the Por'ya Guba dike fields.East European Craton: Early Precambrian history & 3 D. Model Authors: M.V. Mints, K.A. Dokukina, A.N. Konilov, I.B. Philippova, C.L. Zlobin., GSA SPE 510, 433p. Chapter 11, section 3Russia, Kola PeninsulaLamproite
DS201507-0328
2015
Mironov, V.P., Rakevich, A.L., Stepanov, F.A., Emelyanova, A.S., Zedgenizov, D.A., Shatsky, V.S., Kagi, H., Martynovich, E.F.Luminescence in diamonds of the Sao Luiz placer ( Brazil).Russian Geology and Geophysics, Vol. 56, pp. 729-736.South America, BrazilDiamond luminesence
DS201506-0284
2015
Miyahara, M., Ohtani, E., El Goresy, A., Lin, Y., Feng, L.,Zhang, J-C., Gillet, P., Nagase, T., Muto, J., Nishijima, M.Unique large diamonds in a urelilite from Almahat a Sitta TC3, asteroid.Geochimica et Cosmochimica Acta, Vol. 163, pp. 14-26.TechnologyUrelilite
DM201501-0921
2014
Mmegi OnlineDebswana squeezes first carats from tailings dumps.Mmegi.com, Dec. 2, 2p.Africa, BotswanaNews item - Debswana
DM201508-0922
2015
Mmegi OnlineBCL ( Bamangwato Concessions) mentions ongoing exploration for diamonds in the western part of the country.mmegi.bw, June 29, 1/8p.Africa, ZimbabweNews item - BCL
DS201510-1789
2015
Moe, K.S., Yang, J-S, Johnson, P., Xu, X., Wang, W.Microdiamonds in chromitite and peridotite. Type 1aB and 1bGSA Annual Meeting, Paper 300-5, 1p. Abstract only BoothRussiaSpectroscopy
DS201506-0285
2015
Molnar, P.Gravitational instability of mantle lithosphere and core complexes.Tectonics, Vol. 34, 3, pp. 478-487.MantleGeophysics - seismics
DC201506-1592
2015
Monax MiningKimberlite project update on EL 5347 proposed drilling.Monax Mining, Apr. 29, 1/4p. AustraliaNews item - press release
DC201501-1593
2014
Monax Mining LimitedAdditional kimberlites identified near Monax's Maragaret Dam project in S.A.Monax Mining Limited, Nov. 30, 5p.AustraliaNews item - press release
DC201507-1594
2015
Monax Mining LimitedKimberlite project update … Margaret Dam tenement for drilling.Monax Mining Limited, May 29, 1p.AustraliaNews item - press release
DC201507-1595
2015
Monax Mining LimitedKimberlite project - drilling commenced on the Margaret Dam licence 5347.Monax Mining Limited, June 26, 4p.AustraliaNews item - press release
DC201508-1596
2015
Monax Mining LimitedMargaret Dam project - drilling completed.Monax Mining Limited, July 6, 1p.AustraliaNews item - press release
DC201509-1597
2015
Monax Mining LimitedQuarterly report … Margaret Dam tenement update p. 6.Monax Mining Limited, July 30, 16p.AustraliaNews item - press release
DC201512-2445
2015
Monax Mining LimitedPACE funding for maiden kimberlite drilling on EL 5347Monax Mining Limited, Oct. 31, 1p. AustraliaNews item - press release
DS201501-0021
2014
Montsion, J.M.Disrupting Canadian sovereignty? The First Nations & Chin a strategy revisited.Geoforum, Vol. 58, pp. 114-121.CanadaLegal - CSR
DS201501-0022
2014
Moore, A.E.The origin of large irregular gem-quality type II diamonds and the rarity of blue type IIB varieties.South African Journal of Geology, Vol. 117, pp. 233-250.Africa, South Africa, LesothoType 11 diamonds
DS201502-0081
2015
Moore, M., Chakhmouradian, A.R., Mariano, A.N., Sidhu, R.Evolution of rare-earth mineralzation in the Bear Lodge carbonatite, Wyoming: mineralogical and isotopic evidence.Ore Geology Reviews, Vol. 64, pp. 499-521.United States, Wyoming, Colorado PlateauDeposit - Bear Lodge
DS201502-0082
2014
Moreno Chavez, G., Sarocchi, D., Arce Santana, E., Borselli, L.Using Kinect to analyze pebble to block-sized clasts in sedimentology.Computers & Geosciences, Vol. 72, pp. 18-32.TechnologyNot specific to diamonds
DS201503-0162
2015
Mosate, M.R.Debswana Diamond Company: sustainable water use.PDAC 2015, Abstract, 1p.Africa, NamibiaCSR - water
DS201506-0286
2015
Motoki, M.H., Ballmer, M.D.Intraplate volcanism due to convective instability of stagnant slabs in the mantle transition zone.Geochemistry, Geophysics, Geosystems: G3, Vol. 16, 2, pp. 538-551.MantleSubduction
DC201502-1600
2015
Mountain Province Diamonds Inc.Mountain Province Diamonds updates term loan facility. $ US370 millionMountain Province Diamonds Inc., Jan. 8, 1p.Canada, Northwest TerritoriesNews item - press release
DC201503-1601
2015
Mountain Province Diamonds Inc.Mountain Province Diamonds announces credit approval for US$370 M term loan facility.Mountain Province Diamonds Inc., Feb. 3, 1p.Canada, Northwest TerritoriesNews item - press release
DC201503-1602
2015
Mountain Province Diamonds Inc.Mountain Province Diamonds announces C$95 M rights offering.Mountain Province Diamonds Inc., Feb. 18, 3p.Canada, Northwest TerritoriesNews item - press release
DC201504-1598
2015
Mountain Province Diamonds Inc.Announces diamond recovery results from 2014 Tuzo Deep drill program.Mountain Province Diamonds, Mar. 4, 2p.Canada, Northwest TerritoriesNews item - press release
DC201504-1599
2015
Mountain Province Diamonds Inc.Mountain Province Diamonds provides Gahcho Kue project update.Mountain Province Diamonds, Mar. 17, 3p.Canada, Northwest TerritoriesNews item - press release
DC201505-1603
2015
Mountain Province Diamonds Inc.Mountain Province Diamonds announces completion of primary syndication of US $ 370 million term loan facility.Mountain Province Diamonds Inc., Mar. 25, 1p.Canada, Northwest TerritoriesNews item - press release
DC201505-1604
2015
Mountain Province Diamonds Inc.Mountain Province Diamonds C$95 million rights offering completed and oversubscribed.Mountain Province Diamonds Inc., Mar. 31, 1p.Canada, Northwest TerritoriesNews item - press release
DC201505-1605
2015
Mountain Province Diamonds Inc.Mountain Province Diamonds closes term loan facility to fund Gahcho Kue to commercial production.Mountain Province Diamonds Inc., Apr. 7, 2p.Canada, Northwest TerritoriesNews item - press release
DC201506-1607
2015
Mountain Province Diamonds Inc.Mountain Province Diamonds welcomes Societe Generale to lending syndicate.Mountain Province Diamonds Inc., May 7, 2p.Canada, Northwest TerritoriesNews item - press release
DC201508-1606
2015
Mountain Province Diamonds Inc.Mountain Province's Gahcho Kue diamond mine 62 percent complete.Mountain Province Diamonds Inc., July 7, 1p.Canada, Northwest TerritoriesNews item - press release
DC201511-2393
2015
Mountain Province Diamonds Inc.Updates Gahcho Kue… overall project more than 70 % complete.. On plan and budget for first production H2 2016.Mountain Province Diamonds Inc., Oct. 6, 3p.Canada, Northwest TerritoriesNews item - press release
DC201511-2394
2015
Mountain Province Diamonds Inc.Mountain Province appoints vice president diamond marketing. R. MackieMountain Province Diamonds Inc., Oct. 15, 1p.Canada, Northwest TerritoriesNews item - press release
DS201512-1953
2015
Muir, R.J.Digital field mapping - making the change from paper to touchscreen technology.Geology Today, Vol. 31, 6, pp. 232-236.TechnologyMapping

Abstract: Current desktop technology is largely mouse-driven, but many analysts predict that in less than five years we will have a professional workforce that have only experienced learning in a touchscreen environment. Midland Valley have developed a digital mapping tool for smartphones called FieldMove Clino, which has been downloaded more than 20 000 times over the past year. The free version offers an effective way of introducing students to digital field mapping. However, many geoscience departments and teachers of field mapping have yet to make the switch from traditional paper-based methods to digital technology. This article aims to answer some of the frequently asked questions about digital field mapping and outlines some of the advantages for improving field skills and geological thinking in students.
DS201510-1790
2015
Muirhead, J.D., Kattenhorn, S.A., Le Corvec, N.Unravelling the complexity of upper crustal dike networks in continental rifts: examples from East Africa.Geochemistry, Geophysics, Geosystems: G3, Vol. 16, in press availableAfrica, East AfricaDyke swarms

Abstract: The role of dike intrusion in driving continental breakup is fundamental to our understanding of plate tectonics. Buck (2004) showed that the breakup of thick continental lithosphere requires more than far-field tectonic forces, illustrating the important role of dike opening in driving extension during the earliest stages of rifting. Upper crustal diking in rift environments is often depicted to occur through long (up to 80 km), sub-parallel swarms intruding along the full length of rift basins. These assertions are supported by recent dike-driven rifting events in Iceland and Ethiopia (Wright et al., 2012), and inform numerical modelling studies addressing the mechanical effects of dike intrusion to rift processes (e.g., Buck et al., 2005). Our current view of dike networks, however, may be biased to evolved (>20 Ma), oceanic (e.g., Krafla) or nascent (e.g., Dabbahu-Manda-Hararo) spreading centers. This is largely because magmatic rifting occurs in these regions with a high enough frequency that it can be persistently captured using modern-day monitoring techniques (e.g., InSAR and seismicity). Dike networks throughout other sectors of the East African Rift may instead exhibit greater complexity, particularly in early-stage rifts (<10 Ma) undergoing infrequent diking episodes (Calais et al., 2008). By unravelling the contributions of dikes in these basins we can further refine our understanding of the role of magmatism during continental rift initiation. Current geophysical techniques (e.g., seismic reflection) lack the capacity to resolve thin, sub-vertical structures in the sub-surface, and thus reconstructing the geometries of cooled, upper crustal dike swarms poses a significant challenge. Recent structural and volcanological studies in both active and eroded monogenetic volcanic fields have illustrated the utility of volcanic vent alignments and cone morphometrics for inferring the distributions and orientations of upper crustal dikes (Kiyosugi et al., 2012; Le Corvec et al., 2013; Keir et al., 2015). The East African Rift exhibits numerous monogenetic cone fields that may help us understand the distribution and geometry of shallow dike-feeders emplaced in the last few million years (Korme et al., 1997; Mazzarini et al., 2013). Building on these studies and methods, we performed a comparative analysis of upper crustal diking in various rift basins throughout East Africa, based on the distributions, alignments and morphologies of monogenetic cones (Muirhead et al., 2015).
DS201502-0083
2014
Mukherjee, A., Jha, S., Babu, E.V.S.S.K., Verma, C.B.Discovery of a kimberlite pipe near Budikonda, Dharwar craton, south India: field approaches, preliminary petrography and mineral chemistry. KL-7Journal of the Geological Society of India, Vol. 84, 6, pp. 633-644.India, South IndiaKalyandurg cluster
DC201508-1608
2015
Mustang Resources Ltd.Update on Save River project.Mustang Resources , July 15, 2p.Africa, MozambiqueNews item - press release
DC201508-1609
2015
Mustang Resources Ltd.Save River IR.Mustang Resources , July 24pp.Africa, MozambiqueNews item - press release
DC201511-2395
2015
Mustang Resources Ltd.Continuing diamond recovery and expansion at Save River.Mustang Resources Ltd., Oct. 1, 2p.Africa, MozambiqueNews item - press release
DC201511-2396
2015
Mustang Resources Ltd.Save River diamond project - update.Mustang Resources Ltd., Oct 19, 18p.Africa, MozambiqueNews item - Mustang
DC201503-1610
2015
Mwana Africa plc.Excerpt - diamonds - Klipspringer… price per carat $ 19.31.Mwana Africa plc., Feb. 16, 1/2p.Africa, South AfricaNews item - press release
DC201505-1611
2015
Mwana Africa plc.Update section: diamonds - Klipspringer .Mwana Africa plc., Apr. 16, 1/2p.Africa, South AfricaNews item - press release
DC201511-2397
2015
Mwana Africa plc.Mwana Africa changing name to Asa Resources.Mwana Africa plc., Oct. 1, 1p.Africa, South AfricaNews item - press release
DS201502-0084
2015
Nadeau, O., Cayer, A., Pelletier, M., Stevenson, R., Jebrak, M.The Paleoproterozoic Montviel carbonatite hosted REE-Nb deposit, Abitibi, Canada: Geology, Mineralogy, Geochemistry and Genesis.Ore Geology Reviews, Vol. 67, pp. 314-335.Canada, QuebecCarbonatite
DS201511-1865
2015
Nadeau, O., Stevenson, R., Jebrak, M.Evolution of Montviel alkaline-carbonatite complex by coupled fractional crystallization, fluid mixing and metasomatism. Pts. 1 and 2.Ore Geology Reviews, Vol. 72, pp. 1143-1162.Canada, QuebecCarbonatite

Abstract: Magmatic volatiles are critically important in the petrogenesis of igneous rocks but their inherent transience hampers the identification of their role in magmatic and mineralization processes. We present evidence that magmatic volatiles played a critical role in the formation of the 1894 Ma Paleoproterozoic Montviel alkaline-carbonatite complex, Canada, and the related carbonatite-hosted REE-Nb deposit. Field and drill core relationships indicate that lithological units of the complex were emplaced in the following order: clinopyroxenites, melteigites, ijolites, melanosyenites, leucosyenites, granites, lamprophyric silicocarbonatites, rare magnesiocarbonatites, calciocarbonatites, ferrocarbonatites, late mixed carbonatites, kimberlitic silicocarbonatites and polygenic breccias. Magmatic minerals within these units were systematically metasomatized. In undersaturated silicate rocks, augite recrystallized to aegirine–augite and aegirine, plagioclase recrystallized to albite, and nepheline recrystallized with analcime, cancrinite and albite. Primary biotite was replaced by secondary, REE-rich metasomatic biotite, particularly along fractures and alteration pockets. In carbonatites, liquidus phases consisted of calcite and dolomite and were recrystallized to ferroan dolomite, ankerite, siderite, barytocalcite, witherite and strontianite, which are intimately related to the REE-bearing carbonates and fluorocarbonates. Biotite is common to all lithologies, ranges in REE concentrations from 1.5 to 230 ppm and yielded subsolidus crystallization temperatures ranging from 770 °C to 370 °C. Sm-Nd isotope analyses from biotite and aegirine-augite yield a range of ?Nd values (+ 3.4 to ? 3.0) that suggests mixing of fluids from three sources during the crystallization of the Montviel magmas. The clinopyroxenites to melteigite, ijolites and melanosyenites crystallized augite and biotite with initial ?Nd value ? 3.4 and these minerals were metasomatized by a 1st fluid, lowering their ?Nd to values comprised between 0.8 and 3.4. Silicocarbonatites and carbonatites subsequently crystallized aegirine-augite and biotite with initial ?Nd value ? 2.6 and a 2nd fluid metasomatized the minerals to lower ? values. Both the 1st and the 2nd fluids eventually mixed with a 3rd recrystallizing aegirine-augite and biotite and lower their ?Nd values down to ? 3.0. The results presented herein suggest that the mantle magmas evolved through 4 distinct mantle pulses by fractional crystallization, mixing of depleted mantle fluids with crustal fluids, and metasomatism. Some of the silicate rocks also show evidence of assimilation of wall rock as part of their petrogenetic evolution. During the last stages of its evolution in carbonatites, the fluid source transited from the depleted mantle to the crust and we speculate that this resulted in a violent explosive eruption creating the diatreme-shaped, HREE-rich polygenic breccia.
DM201512-2328
2015
National PostDiamond jackpot is historic, says Canadian miner. Stone believed second -largest ever found.National Post Newspaper, Nov. 19, 1/2p.Africa, BotswanaNews item - press release
DS201502-0085
2015
Nature GeoscienceRussia's scientific legacy. See Feb hilight Front cover page for search stringNature Geoscience, Vol. 8, 1p.TechnologyHistory - Lomonosov University
DS201512-1954
2015
Nature GeoscienceProtect sites and samples…. Field samples.Nature Geoscience, Vol. 8, 11, p. 815.GlobalField samples
DS201505-0244
2015
Navon, O.Granulitic xenoliths and the formation of the lower crust below southern Syria and northern Israel and Jordan.Israel Geological Society, Abstracts 1p.Europe, Syria, Israel, JordanMineralogy
DS201506-0287
2015
Nedosekova, I.L., Belousova, E.A., Belyatsky, B.V.Hf isotopes and trace elements as indicators of zircon genesis in the evolution of the alkaline-carbonatite magmatic system ( Il'meno-Visnevogorskii complex, Urals, Russia.)Doklady Earth Sciences, Vol. 461, 2, pp. 384-389.Russia, UralsCarbonatite
DS201510-1791
2015
Nelson, W.R., Furman, T., Pitcavage, E.M.Exploring the link between metasomatized lithosphere and continental rifting: a case study of the East African Rift.GSA Annual Meeting, Paper 131-2, 1p. Abstract onlyAfricaSCLM

Abstract: The subcontinental lithospheric mantle (SCLM) is foundational to understanding the construction, destruction, and division of tectonic plates. Tectonic processes, in turn, both directly and indirectly influence the lithosphere’s thermal, physical and mineralogical properties. Mantle melting and melt/fluid percolation cause fundamental changes to the lithosphere that affect its composition and stability. Specifically, metasomatism by silicate melts and hydrous/carbonated fluids can create lithologies (i.e. pyroxenites) that are denser, more fusible, and less viscous than adjacent peridotite. The resulting density instabilities may lead to lithospheric erosion, topographic uplift and even continental rifting. We explore the link between metasomatized SCLM, mafic volcanism and associated continental rifting in the Ugandan portion of the Western Rift of the East African Rift System using Re-Os isotopes from both alkaline mafic lavas and pyroxenite mantle xenoliths. The lavas record age-corrected 187Os/188Os that range from 0.1421 to 0.2105, which is more radiogenic than primitive mantle (0.1296; Meisel et al., 2001). These data demonstrate that many of the lavas were derived from a metasomatized mantle source though a few have experienced crustal contamination. The mantle xenoliths also record a wide range of 187Os abundances. One peridotite xenolith has a mildly radiogenic signature (187Os/188Os = 0.1342) whereas the pyroxenites span a wide range of 187Os/188Os ratios (0.1401-0.5052). One pyroxenite recorded a mildly unradiogenic 187Os/188Os value (0.127) and has 0.96 ppb of Os. Based on these data, we conclude that the lavas were derived from metasomatized SCLM. Some of the SCLM was sampled by mantle xenoliths but, as a whole, the SCLM is more heterogeneous than the lavas suggest. The widespread, metasomatized SCLM readily contributed to melt generation both in situ as well as during foundering via lithospheric drip (Furman et al., in review). The SCLM-derived volcanism occurred prior to and during Western Rift extension, suggesting that the metasomatized SCLM played a vital role in rift development.
DS201501-0023
2014
Nemeth, P.Asteroid impacts on Earth make structurally bizarre diamonds. Diamond grains from the Canyon Diablo meteroriteNature Communications, Nov. 20, 2p.United States, ArizonaLonsdaleite
DS201504-0211
2015
Nestola, F.The crucial role of crystallography in diamond research.Rendiconzi Lincei Scienze Fisiche E Naturel, Vol. 26, 2, pp. 225-233.MantleDiamond inclusions
DS201502-0086
2015
Neuser, R.D., Schertl, H-P., Logvinova, A.M., Sobolev, N.V.An EBSD study of olivine inclusions in Siberian diamonds: evidence for syngenetic growth?Russian Geology and Geophysics, Vol. 56, 1, pp. 321-329.RussiaDiamond morphology
DC201508-1612
2015
New Nadina Explorations LimitedNew Nadin a Explorations Limited to acquire Kettle River Resources Ltd.New Nadina Explorations Limited, July 20, 1p.Canada, Northwest TerritoriesNews item - press release
DC201505-1613
2015
Newfield Resources LimitedDMS plant successfully commissioned. Allotropes diamond project, SL.Newfield Resources Limited, Mar. 31, 1p.Africa, Sierra LeoneNews item - press release
DC201506-1614
2015
Newfield Resources LimitedAllotropes diamond project - JORC alluvial exploration target.Newfield Resources Limited, Apr. 20, 5p.Africa, Sierra LeoneNews item - press release
DC201508-1615
2015
Newfield Resources LimitedMining licence granted at Allotropes diamond project. Golu sites ( Sewa River system)Newfield Resources Limited, July 1, 3p.Africa, Sierra LeoneNews item - press release
DC201509-1616
2015
Newfield Resources LimitedSierra Leone diamond projects.. Golu Newfield Resources Limited, July 31, 34p.Africa, Sierra LeoneNews item - press release
DC201511-2398
2015
Newfield Resources LimitedReview of activities .. Alluvial Newfield Resources Limited, Sept. 30, 60p.Africa, Sierra LeoneNews item - press release
DC201512-2446
2015
Newfield Resources LimitedGolu bulk sampling.. Planning for follow up airborne mag survey targets, drill testing and plan for advanced stage dredging program on Sewa River.Newfield Resources Limited, Oct. 30, 1p. HighlightsAfrica, Sierra LeoneNews item - press release
DS201503-0163
2015
Newton, A.Archean Earth: alkaline lakes of old.Nature Geoscience, Vol. 8, p. 90.MantleAlkalic
DS201502-0087
2015
Nikolenko, E., Tychkov, N., Afanasiev, V.Mantle xenocrysts of the Chompolo kimberlite field, Aldan shield, south Yakutia.Economic Geology Research Institute 2015, Vol. 17,, # 2471, 1p. AbstractRussiaDeposit - Chompolinskoe
DS201502-0088
2015
Nimis, P., Goncharov, A., Ionov, D.A., McCammon, C.Fe3 partitioning systematics between orthopyroxene and garnet in mantle peridotite xenoliths and implications for thermobarometry of oxidized and reduced mantle rocks.Contributions to Mineralogy and Petrology, Vol. 169, 6p.MantlePeridotite
DS201506-0288
2015
Nkono, C., Femenias, O., Lene, A., Mercier, J-C., Ngounouno, F.Y., Demaiffe, D.Relationship between the fractal dimension of orthopyroxene distribution and the temperature in mantle xenoliths.Geological Journal, in press availableRussia, PolandXenoliths
DS201510-1792
2015
Nkoudandou, O.F., Bardintzeff, J-M., Fagny, A.M.Sub-continental lithospheric mantle structure beneath the Adamawa plateau inferred from the petrology of ultramafic xenoliths from Ngaoundere, Cameroon, Central Africa. Journal of African Earth Sciences, Vol. 111, pp. 26-40.Africa, CameroonLherzolite, Harzburgite, Olivine websterite

Abstract: Ultramafic xenoliths (lherzolite, harzburgite and olivine websterite) have been discovered in basanites close to Ngaoundéré in Adamawa plateau. Xenoliths exhibit protogranular texture (lherzolite and olivine websterite) or porphyroclastic texture (harzburgite). They are composed of olivine Fo89-90, orthopyroxene, clinopyroxene and spinel. According to geothermometers, lherzolites have been equilibrated at 880-1060 °C; equilibrium temperatures of harzburgite are rather higher (880-1160 °C), while those of olivine websterite are bracketed between 820 and 1010 °C. The corresponding pressures are 1.8-1.9 GPa, 0.8-1.0 GPa and 1.9-2.5 GPa, respectively, which suggests that xenoliths have been sampled respectively at depths of 59-63 km, 26-33 km and 63-83 km. Texture and chemical compositional variations of xenoliths with temperature, pressure and depth on regional scale may be ascribed to the complex history undergone by the sub-continental mantle beneath the Adamawa plateau during its evolution. This may involve a limited asthenosphere uprise, concomitantly with plastic deformation and partial melting due to adiabatic decompression processes. Chemical compositional heterogeneities are also proposed in the sub-continental lithospheric mantle under the Adamawa plateau, as previously suggested for the whole Cameroon Volcanic Line.
DC201502-1617
2015
North Arrow Minerals Inc.North Arrow updates Qilaugaq bulk sample processing.North Arrow Minerals Inc., Jan. 21, 2p.Canada, NunavutNews item - press release
DC201504-1618
2015
North Arrow Minerals Inc.North Arrow reports initial diamond recoveries from the first 609 tonnes of Qialugaq sample… two +4 carat yellow diamonds recovered. Q1-4North Arrow Minerals Inc., Feb. 26, 2p.Canada, NunavutNews item - press release
DC201505-1619
2015
North Arrow Minerals Inc.North Arrow discovers three new kimberlites at the Pikoo diamond project, Saskatchewan.. PK314 drilled to depth of 213m and PK 150 drilled to 199 m.North Arrow Minerals Inc., Mar. 30, 3p.Canada, SaskatchewanNews item - press release
DC201505-1620
2015
North Arrow Minerals Inc.North Arrow reports yellow diamonds from Q1-4 kimberlite are rare type 1b diamonds. Qilalugaq projectNorth Arrow Minerals Inc., Apr. 21, 2p.Canada, NunavutNews item - press release
DC201506-1621
2015
North Arrow Minerals Inc.North Arrow reports final diamond recoveries from Qilalugaq bulk sample.North Arrow Minerals Inc., May 5, 2p.Canada, Northwest TerritoriesNews item - press release
DC201506-1622
2015
North Arrow Minerals Inc.North Arrow announces $ 3 million private placement.North Arrow Minerals Inc., May 8, 1p.Canada, Northwest TerritoriesNews item - press release
DC201507-1623
2015
North Arrow Minerals Inc.North Arrow announces closing of $ 4 million bought deal.North Arrow Minerals Inc., May 28, 1p.Canada, Northwest TerritoriesNews item - press release
DC201507-1624
2015
North Arrow Minerals Inc.North Arrow updates the Redemption diamond project, Lac de Gras.North Arrow Minerals Inc., June 2, 1p.Canada, Northwest TerritoriesNews item - press release
DC201507-1625
2015
North Arrow Minerals Inc.North Arrow reports diamond valuation results from the Qilalugaq project. North Arrow Minerals Inc., June 9, 1p.Canada, Northwest TerritoriesNews item - press release
DC201510-2357
2015
North Arrow Minerals Inc.North Arrow confirms high diamond counts from Pk150 kimberlite Pikoo.North Arrow Minerals Inc., Sept. 8, 2p.Canada, SaskatchewanNews item - press release
DC201510-2358
2015
North Arrow Minerals Inc.North Arrow completes till sampling at the Mel diamond project, Nunavut.North Arrow Minerals Inc., Sept. 16, 1p.Canada, NunavutNews item - press release
DC201511-2399
2015
North Arrow Minerals Inc.North Arrow confirms four Diamondiferous kimberlites at Pikoo diamond project, Saskatchewan. PK314 and PK311 ( prev. PK150 drilled)North Arrow Minerals Inc., Oct. 20, 3p.Canada, SaskatchewanNews item - press release
DC201503-1626
2015
Northland Capital Partners LimitedParagon Diamonds … initiation: an emerging integrated diamond producer. LemphaneNorthland Capital Partners Limited Research Report, Feb. 2, 36p.Africa, LesothoNews item - Paragon
DC201503-1627
2015
Nouveau Monde Mining Enterprises Inc.Waasikuu kimberlite targets drilled . No kimberlitic rocks.Nouveau Monde Mining Enterprises, Feb. 5, 1/8p.Canada, QuebecNews item - press release
DS201507-0329
2015
Novella, D., Bolfan-Casanova, N., Nestola, F., Harris, J.W.H2O in olivine and garnet inclusions still trapped in diamonds from the Siberian craton: implications for the water content of cratonic lithosphere peridotites.Lithos, Vol. 230, pp. 180-183.RussiaDeposit - Udachnaya
DS201512-1955
2015
Novy, L., Petherbridge, W.Ekati Long Lake containment facility reclamation research.43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 76.Canada, Northwest TerritoriesDeposit - Ekati

Abstract: The Ekati Diamond Mine is a surface and underground diamond mine operated by Dominion Diamond Ekati Corporation. It is located near the Lac de Gras Northwest Territories, Canada approximately 300 km north of Yellowknife and roughly 200 km south of the Arctic Circle. The Ekati Long Lake Containment Facility (LLCF) is a five celled containment area for storage of processed kimberlite generated during the processing and extraction of diamonds from kimberlite ore. The LLCF has been in operation since 1998 and deposition of processed kimberlite has occurred within the three northern cells with the remaining two cells being used for water quality “polishing” to help meet discharge criteria. The Interim Closure and Reclamation Plan for Ekati outlines a plan to cover the LLCF kimberlite surface with a combination of rock and vegetation. The cover system looks to fulfill the closure objective of physically stabilizing the processed kimberlite and creating a landscape safe for wildlife and human use. Cell B of the LLCF has reached its capacity and is being used as a reclamation research area. The purpose of the reclamation research is to identify a long term cover design that can be expanded to the whole LLCF. A winter drilling investigation in Cell B of the LLCF was undertaken in 2013. The objective of the investigation was to characterize the processed kimberlite and its porewater chemistry. Results from the investigation indicated that permafrost has aggraded into the kimberlite and surface zone pore water concentrations were higher when compared to process plant discharge. In fall of 2013 various areas of Cell B were seeded with annual and perennial vegetation ground covers. Further seeding of Cell B was completed in the summer of 2014. Seed from a variety of sources that includes locally harvested and commercially available native plants and farm crops was applied at different rates using different seeding techniques. In the winter of 2013 rock was placed in various configurations within the seeded areas to evaluate its effects on vegetation growth and erosion control. A total of 25 hectares has been seeded in Cell B since the fall of 2013 and the results of initial monitoring are positive regarding establishment of long term ground cover on the kimberlite.
DS201506-0289
2015
Nowacki, A., Kendall, J-M., Wookey, J., Pemberton, A.Mid mantle anisotropy in subduction zones and deep water transport.Geochemistry, Geophysics, Geosystems: G3, Vol 16, 3, pp. 764-784.MantleSubduction
DM201501-0923
2014
Nunatsiaqonline.caAbandoned Nunavut diamond mine now belongs to the crown. Court documents show Shear Diamonds has legally forfeited assets and mineral leases Jericho Nunavut news, Dec. 19, 1p.Canada, NunavutNews item - Jericho
DS201510-1793
2015
Nutman, A.P., Bennett, V.C., Friend, C.R.L.Proposal for a continent 'Itsaqia' amalgamted at 3.66 Ga and rifted apart from 3.53 Ga: initiation of a Wilson Cycle near the start of the rock record.American Journal of Science, Vol. 315, 6, pp. 509-536.CanadaAcasta Gneiss

Abstract: A synthesis of the geological record of Earth's ten remaining oldest surviving gneiss complexes, each containing >3.6 Ga rocks, reveals a common history. We propose that the simplest scenario compatible with all observations is that of formation of an ancient continental mass, here named Itsaqia, by 3.66 Ga from amalgamation of earlier quartzofeldspathic crust, followed by initiation of continental break-up at 3.53 Ga by rifting. Evidence for this is reconstructed from the remaining oldest rock record (only ca. 10,000 km2 globally). Dominating the surviving fragments of the proposed Itsaqia continent are 3.9 to 3.66 Ga tonalites that represent juvenile crustal additions with whole-rock initial ?Nd >+1 and zircon initial ?Hf ? 0. Their trace element chemistry shows that they were derived by ca. 30 percent partial melting of garnetiferous, mostly eclogitized basic rocks, leaving behind a subcrustal garnet-rich restite. The tonalites contain inclusions of mafic rocks with chemical signatures diagnostic of mantle wedge fluxing, such as enrichment in the light rare earths and depletion of Nb and Ti. We interpret that this juvenile crust formed repeatedly in arc-like constructs at convergent plate boundaries. The Acasta Gneiss of Canada is the only undisputed surviving rock record of the proposed Itsaqia continent where crust formation extends back to the Hadean. Before ca. 3.66 Ga, individual gneiss complexes show distinct chronologies of crust formation, yet despite their present-day isolation, they underwent identical 3.66 to 3.6 Ga high temperature orogenic events (Isukasian orogeny) – which we contend indicates that from 3.66 Ga these complexes had amalgamated into a single continental mass. Rare surviving 3.66 Ga high-pressure granulite rocks that underwent rapid decompression indicate tectonic crustal thickening then collapse during amalgamation. This was followed by almost 50 million years of high heat flow and lower pressure metamorphism, most probably in an extensional setting. Starting from ca. 3.53 Ga, we propose that komatiite and basalt eruption and dike emplacement marked the start of Itsaqia's dismemberment by rifting. We further speculate that the deep mantle upwelling responsible for this plume-related magmatism was triggered by either the cascade of pre-3.66 Ga sub-Itsaqia high density garnet-rich restitic subduction graveyards into the lower mantle or the thermal insulation effect of Itsaqia. This resembles the mechanisms of supercontinent breakup throughout Earth's history. Hence we propose that Wilson Cycles of continent amalgamation and breakup were already initiated by the Eoarchean, near the start of the rock record. Australia's East Pilbara region was over the top of the plume, where the thermal impact destroyed Itsaqia by melting to give rise to felsic igneous rocks coeval with komatiites. Greenland's Itsaq Gneiss Complex was peripheral to the plume, and hence was heavily diked at ca. 3.5 Ga, but was not melted.
DM201501-0924
2014
ODBAOnline Diamond Buying Advice unveils new diamond search tool and website re-launch. Online Diamond Buying Advice, Dec. 9, 1p.TechnologyNews item - ODBA
DC201502-1628
2015
OGI GroupIncrease in underwriting commitment and commencement of trial mining program Save River diamonds project.OGI Group Limited, Jan. 7, 1p.Africa, MozambiqueNews item - press release
DS201510-1794
2015
Ogungbuyi, P.I., Janney, P.E., Harris, C.The petrogenesis and geochemistry of the Zandkopsdrift carbonatite complex, Namaqualand, South Africa.GSA Annual Meeting, Paper 131-14, 1p. Abstract onlyAfrica, South AfricaCarbonatite

Abstract: Petrologic and geochemical data for carbonatites and associated alkaline igneous rocks are presented for the Zandkopsdrift Carbonatite Complex, Namaqualand. The samples included in this study are relatively fresh, collected by coring at depths of >70 m below the weathered cap zone. The Zandkopsdrift complex is the only locality in the province known to contain significant carbonatite. The carbonatites studied are calico-, ferro- and silico- carbonatites, based on mineralogy, texture, and major element composition. They have low to moderate Mg-numbers (35-65), variable MgO contents (1.2-8.50 wt.%) and high atomic Ca/Ca+Mg (0.73-0.97), indicating that they are not likely simple mantle melts. The carbonatites contain significant apatite, magnetite, pyrochlore and phlogopite. Zandkopsdrift also contains significant amounts of aillikite and olivine melilitite. These rocks have relatively low SiO2 (25-31 wt.%) and Al2O3 (5.3- 6.1 wt.%), high K2O (6-6.3 wt.%) and TiO2 (5.6-9.5 wt.%) and moderate Mg numbers (51-58). ?18O and ?13C isotopes were measured for carbonatites and aillikites. ?13CPDB values are close to those expected for mantle-derived carbonatites (-3.9 to -8.83), while the ?18OSMOW values are significantly higher (+13. 25 to 21.84‰). The high ?18O value observed in carbonatites and aillikites is most likely attributable to secondary alteration by hydrous/hydrothermal fluids. This supports the inference that the Zandkopsdrift carbonatite is magmatic in origin but was later affected by secondary alteration which resulted in the elevated O stable isotopes. The ‘mantle-like’ ?13C is inconsistent with significant assimilation of C-bearing crustal rocks. Chondrite-normalised REE contents in the carbonatites are 2400 to 10,600 for La and 36 to 170 for Lu. The high REE contents of the carbonatites are most likely due to a combination of a source metasomatised by a highly LREE-enriched agent, as well as significant magmatic differentiation. The relatively fractionated composition of the Zandkopsdrift aillikites and melilitites is also consistent with this hypothesis. We propose that the Zandkopsdrift carbonatites were most likely formed by either immiscible liquid separation from or fractional crystallization of a moderately fractionated, carbonate-rich silicate parental magma. Session No. 131--Booth# 338
DS201510-1795
2015
Ohtani, E.Hydrous minerals and the storage of water in the deep mantle.Chemical Geology, Vol. 418, pp. 6-15.MantleWater

Abstract: Water is transported into the deep mantle via hydrous minerals in subducting slabs. During subduction, a series of minerals in these slabs such as serpentine or chlorite, Mg-sursassite and/or the 10 Å phase, and phase A can be stable at different pressures within the slab geotherms, and may transport significant amount of water into the Earth's interior. The transition zone has a large water storage capacity because of the high solubility of water in wadsleyite and ringwoodite. The recent discovery of hydrous ringwoodite and phase Egg as inclusions in ultra deep diamonds from Juina, Brazil suggests that the transition zone may indeed contain water. Seismic tomographic studies and electrical conductivity observations suggest that the transition zone may contain large amount of water, at least locally, beneath the subduction zones. The discovery of a new hydrous phase H, MgSiO2(OH)2, and its solid solution with isostructural phase ?-AlOOH, suggests that a significant amount of water could be stored in this hydrous magnesium silicate phase which is stable down to the lower mantle. Water may be transported into the bottom of the lower mantle via phase H–? solid solution in descending slabs. This new high pressure hydrous phase solid solution has a high bulk modulus and sound velocity owing to strong O-H bonding due to hydrogen bond symmetrization in the lower mantle. Therefore, water stored in this hydrous phase would not reduce the seismic wave velocity in the lower mantle, and is seismically invisible. Dehydration melting could then occur at the base of the lower mantle, providing a potential explanation for the ultralow-velocity zone at the core-mantle boundary. When this hydrous magnesium silicate phase or hydrous melt makes contact with the metallic outer core at the core-mantle boundary, then hydrogen is likely to dissolve into the core.
DS201503-0164
2015
Ohtani, E., Amaike, Y., Kamada, S., Sakamaki, T., Hirao, N.Stability of hydrous phase H MgSi04H2 under lower mantle conditions.Geophysical Research Letters, Vol. 41, 23, pp. 8283-8287.MantleMineralogy
DS201512-1956
2015
O'Keefe, M.Rough year creates opportunity in diamonds.Diamonds in Canada Magazine, Northern Miner, Nov. pp. 5-9.Global, CanadaDiamond industry
DS201508-0370
2015
O'Leary, M.C., Lange, R.A., Ai, Y.The compressability of CaCO3-Li2CO3-Na2CO3-K2CO3 liquids: application to natrocarbonatite and CO2- bearing nephelinite liquids from Oldoinyo Lengai.Contributions to Mineralogy and Petrology, Vol. 170, 18p.Africa, TanzaniaDeposit - Oldoinyo Lengai
DC201501-1629
2014
Olivut Resources Ltd.Exploration and funding update.Olivut Resources Ltd., Dec. 16, 1p.Canada, Northwest TerritoriesNews item - press release
DC201505-1630
2015
Olivut Resources Ltd.Funding and exploration update on HOAM project.Olivut Resources Ltd., Mar. 30. 1p.Canada, Northwest TerritoriesNews item - press release
DC201511-2400
2015
Olivut Resources Ltd.Olivut announces private placement of flow through shares and common shares.Olivut Resources Ltd., Sept. 30, 1p.Canada, Northwest TerritoriesNews item - press release
DS201503-0165
2015
O'Neill, C., Lenardic, A., Condie, K.C.Earth's punctuated tectonic evolution: cause and effect.Geological Society of London Special Publication: Continent formation through time., No. 389, pp. 17-40.MantleGeotectonics
DS201510-1796
2015
Ostrye, S., Jonathan, C., Tozer, R., Dirlam, D.M.The GIA Library's digitization project: providing access in a digital world.GSA Annual Meeting, Paper 300-2, 1p. Abstract only BoothTechnologyGIA library

Abstract: Through its digitization project, the Gemological Institute of America’s (GIA) Richard T. Liddicoat Library is making available digital copies of historic and unique books to geoscientists worldwide. By the end of 2015, more than 100 volumes from the library’s rare book collection, including the gemology and mineralogy library collected by John and Marjorie Sinkankas, will be posted online in a readily accessible, searchable format. In December 2014, the library purchased the BC100 Book Capture system by Digital Transitions. This equipment includes two Phase One digital camera backs with Schneider Kreuznach lenses, which photograph the two pages of an open book simultaneously. Images are captured at a minimum resolution of 300 pixels per inch, with higher resolutions used for books that are small, have highly detailed color images, or have small or faded text. Capture One imaging software is used to generate a TIFF image for each page. These TIFF files will be saved indefinitely as preservation masters, from which derivative files can be created and modified for future use. Then docWorks post-processing software by Content Conversion Specialists is used to perform optical character recognition (OCR) and generate a searchable PDF and ePub output for each book. The OCR supports a variety of languages including those using European and Cyrillic alphabets, as well as Chinese, Japanese, and Korean characters. A number of GIA’s digital books are now available online to view and download for free through Internet Archive (https://archive.org/details/@gia_library) with new books being uploaded every few days. Available books include out-of-copyright titles dating from 1496 to the 1920s. One of the oldest digitized books, Libellus de Lapidibus Preciosis (Book of Precious Stones) by Marbode, Bishop of Rennes, printed in 1511, was originally written in the 11th century and discusses properties of 60 gems. Another title, René Just Haüy’s influential Traité de Minéralogie (Treatise of Mineralogy) published in 1801, describes the laws governing crystal structure and was the first rational system for identifying and classifying minerals. The digitization project is ongoing with plans to ultimately post hundreds of volumes related to gems and minerals.
DS201512-1957
2015
Paget, M., Chiaramello, P.Goldsim water balance modeling of waste rock piles, Ekati waste rock storage area ( Ekati WRSA).43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 77.Canada, Northwest TerritoriesDeposit - Ekati

Abstract: The Ekati Waste Rock Storage Piles (WRSA) water balance model was developed in Goldsim as a module designed to support water quality estimates. The water balance module accounts for direct precipitation, snowmelt, seepage, runoff, and delays to flow within the WRSA. As the Ekati Mine is located within a climate zone of continuous permafrost, a portion of the water infiltrating the WRSA’s becomes trapped within the waste rock as ice when it encounters sub-freezing internal temperatures. Seepage leaching from the WRSAs is thus limited to the outer surface of the WRSAs (active layer) where water produced by melting of seasonal surficial ice and snow. The active layer was modeled by detaining all water in the WRSA from October to the end of June. After June the water was released from the layer using a delay function, which is described below. The model divides seepage and runoff into three physically-based flow paths. ? The primary flow path is of water that falls infiltrates vertically through the waste rock until it encounters an impermeable lens of ice-saturate rock, and travels horizontally, to ultimately emerge at the toe of the WRSAs. ? The secondary flow path is water that falls on the outer slopes of the WRSAs and seeps under the outer slopes to the toe. ? The third flow path is also of water that falls on the outer slopes of the WRSAs and travels along the surface of the WRSA to the toe as runoff. Water losses were accounted at the surface of the pile prior to infiltration and within the pile as follows; ? water losses from evaporation is represented by a runoff coefficients; and ? water loss to the pile is modeled based on a percentage of volume of waste rock. As each WRSA is saturation flows exiting the pile increase. Flat infiltration is the slowest flow path and creates base flows that maintain flows out of the WRSAs during late summer and early winter periods. The slopes seepage is released more slowly over several days or weeks. While slopes runoff is the fastest flow path creating storm peaks during rainfall events. Results of the total WRSA discharge are a constant slow outflow at the toe with small increases due to precipitation events and the freshet, which is consistent with observations of waste rock drainage. Flows are attenuated using a time delay, which was simulated for each flow path using an Erlang function. The Erlang function refers to a two-parameter Gaussian distribution, where the shape parameter n is an integer. Hydrologically, the parameter n corresponds to the number of hypothetical linear reservoirs (Nash 1957). For the slopes runoff, n = 1 is assumed, which gives an exponential distribution. For the flats infiltration and slope seepage n = 2 is assumed, which gives a typical unit hydrograph shape with a delayed peak flow. The value of the lag parameter for each component was determined through model calibration.
DS201509-0417
2015
Palyanov, Y.N., Borzdov, Y.M., Kupriyanov, I.N., Bataleva, Y.V., Khohkhryakov, A.F.Diamond crystallization from tin-carbon system at HPHT conditions.Diamond and Related Materials, Vol. 58, pp. 40-45.TechnologyDiamond synthetics

Abstract: Diamond crystallization from the tin–carbon system has been studied at 7 GPa and temperatures ranging from 1600 to 1900 °C with reaction times from 1 to 20 h. Both diamond growth on the seed crystals and diamond spontaneous nucleation were established, providing evidence for the catalytic ability of tin. A distinctive feature of the Sn–C system is the existence of a significant induction period preceding diamond spontaneous nucleation. Temperature and kinetics are found to be the main factors governing diamond crystallization process. The minimum parameters of diamond spontaneous nucleation are determined to be 7 GPa, 1700 °C and 20 h. The stable form of diamond growth is octahedron and it does not depend on temperature. Synthesized diamonds contain high concentrations of nitrogen impurities up to about 1600 ppm.
DS201502-0089
2015
Palyanov, Y.U., Sokol, A.G., Khokhryakov, A.F., Kruk, A.N.Conditions of diamond crystallization in kimberlite melt: experimental data.Russian Geology and Geophysics, Vol. 56, 1-2, pp. 196-210.TechnologyDiamond morphology
DS201504-0212
2015
Panero, W.R., Pigott, J.S., Reaman, D.M., Kabbes, J.E., Liu, Z.Dry ( Mg,Fe) SiO3 perovskite in the Earth's lower mantle.Journal of Geophysical Research, Vol. 120, 2, pp. 894-908.MantlePerovskite
DC201501-1632
2014
Pangolin Diamonds CorporationMicroprobe and drilling results from Malatswe, Botswana. Picroilmenites Pangolin Diamonds Corporation, Dec. 9, 2p.Africa, BotswanaNews item - press release
DC201502-1633
2015
Pangolin Diamonds CorporationPangolin discovers a second diamond area, Malatswae, Botswana.Pangolin Diamonds Corporation, Jan. 13, 2p.Africa, BotswanaNews item - press release
DC201505-1634
2015
Pangolin Diamonds CorporationPangolin closes $ 404,375 financing for diamond projects in Botswana.Pangolin Diamond Corporation, Mar. 27, 1p.Africa, BotswanaNews item - press release
DC201505-1635
2015
Pangolin Diamonds CorporationPangolin receives additional prospecting licences at the Malatswae diamond project, Botswana.Pangolin Diamond Corporation, Apr. 7, 1p.Africa, BotswanaNews item - press release
DC201507-1636
2015
Pangolin Diamonds CorporationUpdate for the MAL157 diamond, Malatswae diamond project, Botswana.Pangolin Diamonds Corporation, June 2, 2p.Africa, BotswanaNews item - press release
DC201508-1631
2015
Pangolin Diamonds CorporationPangolin appoints Dr. Leon Daniels as President/CEO and new BOD Patrick Harford; premium to market private placement ( up to $500,000)Pangolin Diamond Corporation, July 9, 1p.Africa, BotswanaNews item - press release
DC201508-1637
2015
Pangolin Diamonds CorporationPangolin updates Malatswae diamond project, Botswana.Pangolin Diamond Corporation, June 30, 1p.Africa, BotswanaNews item - press release
DC201508-1638
2015
Pangolin Diamonds CorporationPangolin receives positive kimberlite indicator analyses for Malatswae diamond project, Botswana.Pangolin Diamond Corporation, July 15, 2p.Africa, BotswanaNews item - press release
DC201509-1639
2015
Pangolin Diamonds CorporationUpdate for the Botswana exploration projects - DMS plant and soil sampling. Malatsawe, Rehobeth, Jwaneng South, Machaneng South projects.Pangolin Diamonds Corporation, July 29, 2p.Africa, BotswanaNews item - press release
DC201509-1640
2015
Pangolin Diamonds CorporationPangolin receives positive results from ground penetrating at Malatswae diamond project, Botswana.Pangolin Diamonds Corporation, Aug. 12, 3p.Africa, BotswanaNews item - press release
DC201510-2359
2015
Pangolin Diamonds CorporationPangolin receives positive results from ground penetrating radar survey at Malatswae diamond project, Botswana.Pangolin Diamonds Corporation , Sept. 23, 2p.Africa, BotswanaNews item - press release
DC201511-2401
2015
Pangolin Diamonds CorporationPangolin recovers fifth diamond from Malatswae diamond project, Botswana.Pangolin Diamonds Corporation, Sept. 29, 2p.Africa, BotswanaNews item - press release
DC201512-2447
2015
Pangolin Diamonds CorporationPangolin recovers 14 pyrope garnets from Malatswae.Pangolin Diamonds Corporation, Nov. 3, 1p.Africa, BotswanaNews item - press release
DC201512-2448
2015
Pangolin Diamonds CorporationPangolin recovers two diamond fragments from Malatswae.Pangolin Diamonds Corporation, Nov. 16, 1p.Africa, BotswanaNews item - press release
DC201512-2449
2015
Pangolin Diamonds CorporationPangolin reports pyrope G10 garnets, Malatswae diamond project, Botswana.Pangolin Diamonds Corporation, Nov. 19, 2p.Africa, BotswanaNews item - press release
DC201501-1641
2014
Paragon Diamonds LimitedParagon Diamonds update on processing plant for Lemphane kimberlite project Lesotho.Paragon Diamonds Limited, Nov. 25, 2p.Africa, LesothoNews item - press release
DC201503-1642
2015
Paragon Diamonds LimitedBinding MOU signed for US $ 12 m financing package. Triangle General Trading.Paragon Diamonds Limited, Jan. 28, 1p.AfricaNews item - press release
DC201504-1643
2015
Paragon Diamonds LimitedUpdate on Lemphane diamond project and placing. Paragon Diamonds Limited, Mar. 13, 4p.Africa, LesothoNews item - press release
DC201506-1644
2015
Paragon Diamonds LimitedMou to acquire Mothae kimberlite diamond project in Lesotho from Lucara.Paragon Diamonds Limited, May 5, 5p.Africa, LesothoNews item - press release
DC201507-1645
2015
Paragon Diamonds LimitedParagon Diamonds confident of Mothae approval ahead of Lesotho trip.Paragon Diamonds Limited, June 18, 2p.Africa, LesothoNews item - press release
DC201510-2360
2015
Paragon Diamonds LimitedPositive technical study for Mothae kimberlite project.Paragon Diamonds Limited, Sept. 15, 2p.Africa, LesothoNews item - press release
DS201503-0166
2015
Pasava, J., Malec, J., Griffin, W.L., Gonzalez-Jiminez, J.M.Re-Os isotopic constraints on the source of platinum-group minerals (PGMs) from the Vestrev pyrope rich garnet placer deposit, Bohemian Massif.Ore Geology Reviews, Vol. 68, pp. 117-1326EuropeGarnet mineralogy
DS201510-1797
2015
Pashkevich, I.K., Savchenko, A.S., Starostenko, V.I., Sharov, N.V.A three dimensional geophysical model of the Earth's crust in the central part of the Karelian Craton.Doklady Earth Sciences, Vol. 463, 2, pp. 808-812.RussiaGeophysics
DS201507-0330
2015
Pavlov, V.E., Shatsilli, A.V.Place of birth of the Siberian platform.Doklady Earth Sciences, Vol. 462, 1, pp. 444-448.RussiaMagmatism
DS201511-1866
2014
Payne, C., Bauer, R.Differing causes of colour in diamonds.Australian Gemmologist, Vol. 24, 1, pp. 15-16.TechnologyDiamond colour
DS201501-0025
2015
Pell, J.Building the diamond resource at Chidliak, Baffin Island, Nunavut.PDAC 2015, 1p. AbstractCanada, Nunavut, Baffin IslandDeposit - Chidliak
DS201501-0024
2015
Pell, J., Russell, J.K., Zhang, S.Kimberlite emplacement temperatures from conodont geothermometry.Earth and Planetary Science Letters, Vol. 411, pp. 131-141.Canada, Nunavut, Baffin IslandDeposit - Chidliak
DS201508-0371
2015
Pell, R.Kovdor plans for expansion. International Mining, July p. 16, 18, 20Russia, Kola PeninsulaDeposit - Kovdor
DC201501-1646
2014
Peregrine Diamonds Ltd.Peregrine prepares for Chidliak development program. Production in phases CH-6, CH-7 and CH-44 first phase.Peregrine Diamonds Limited, Dec. 7, 4p.Canada, Nunavut, Baffin IslandNews item - press release
DC201502-1650
2014
Peregrine Diamonds Ltd.Peregrine arranges $ 2.19 million private placement.Peregrine Diamonds Limited, Dec. 22, 1p.Canada, Nunavut, Baffin IslandNews item - press release
DC201502-1651
2014
Peregrine Diamonds Ltd.Peregrine completes $ 2.19 million private placement.Peregrine Diamonds Limited, Dec. 30, 1p.Canada, Nunavut, Baffin IslandNews item - press release
DC201502-1652
2015
Peregrine Diamonds Ltd.Peregrine reports 15% increase in CH-6 kimberlite inferred diamond resource to 8.57 million carats and significant kimberlite tonnage estimate increases for CH-6, CH-7 and CH-44.Peregrine Diamonds Ltd., Jan. 26, 6p.Canada, Nunavut, Baffin IslandNews item - press release
DC201503-1653
2015
Peregrine Diamonds Ltd.Peregrine forms, staffs new subsidiary. Peregrine Exploration Ltd.Peregrine Diamonds Ltd., Feb. 12, 2p.Canada, Nunavut, Northwest TerritoriesNews item - press release
DC201504-1654
2015
Peregrine Diamonds Ltd.Peregrine Files NI 43-101 technical report for Chidliak.Peregrine Diamonds Ltd., Feb. 24, 3p.Canada, Nunavut, Baffin IslandNews item - press release
DC201504-1655
2015
Peregrine Diamonds Ltd.Peregrine files updated technical report for Chidliak project.Peregrine Diamonds Ltd., Feb. 24, 1p.Canada, Nunavut, Baffin IslandNews item - press release
DC201504-1656
2015
Peregrine Diamonds Ltd.Peregrine identifies new zone with high diamond counts at Chidliak CH-7 kimberlite pipe.Peregrine Diamonds Ltd., Mar. 10, 5p.Canada, Nunavut, Baffin IslandNews item - press release
DC201504-1657
2015
Peregrine Diamonds Ltd.Peregrine begins bulk sample drilling at Chidliak. Update on 2015 diamond resource development program.Peregrine Diamonds Ltd., Mar. 23, 2p.Canada, Nunavut, Baffin IslandNews item - press release
DC201504-1658
2015
Peregrine Diamonds Ltd.Peregrine Diamonds announces transfer of assets to Peregrine exploration and commencement of exploration initiatives ( including extensive database)Peregrine Diamonds Ltd., Mar. 24, 3p.Canada, Northwest TerritoriesNews item - press release
DC201505-1659
2015
Peregrine Diamonds Ltd.Peregrine to acquire Diamexstrat Botswana. 8 highly prospective licences.Peregrine Diamonds Ltd., Mar. 30, 3p.Africa, BotswanaNews item - press release
DC201505-1660
2015
Peregrine Diamonds Ltd.Peregrine receives $ 11.85 million from warrant exercise.Peregrine Diamonds Ltd., Apr. 7, 1p.Canada, NunavutNews item - press release
DC201505-1661
2015
Peregrine Diamonds Ltd.Peregrine provides update on 2015 diamond resource development program.Peregrine Diamonds Ltd., Apr. 23, 2p.Canada, NunavutNews item - press release
DC201506-1662
2015
Peregrine Diamonds Ltd.Peregrine announces completion of RC drilling portion of 2015 diamond resource development at Chidliak. CH-7Peregrine Diamonds Ltd., May 14, 4p.Canada, Nunavut, Baffin IslandNews item - press release
DC201508-1647
2015
Peregrine Diamonds Ltd.Peregrine closes acquisition of Diamexstrat. Completes Botswana transaction and commences 2015 Botswana exploration program. DES U.K. Peregrine Diamonds Limited, July 14, 1p.Africa, BotswanaNews item - press release
DC201508-1648
2015
Peregrine Diamonds Ltd.Peregrine provides Chidliak bulk sample update and commences summer 2015 diamond resource development program.Peregrine Diamonds Limited, July 21, 3p.Canada, Nunavut, Baffin IslandNews item - press release
DC201509-1649
2015
Peregrine Diamonds Ltd.Peregrine Diamonds may benefit from new Iqaluit port.Peregrine Diamonds Limited, July 31, 1p.Canada, NunavutNews item - press release
DC201510-2361
2015
Peregrine Diamonds Ltd.Peregrine completes Field work program at Chidliak.Peregrine Diamonds Limited, Sept. 9, 3p.Canada, Nunavut, Baffin IslandNews item - press release
DC201511-2402
2015
Peregrine Diamonds Ltd.Peregrine to commence drilling kimberlite targets in Botswana. MoralanePeregrine Diamonds Ltd., Oct. 22, 2p.Africa, BotswanaNews item - press release
DC201512-2450
2015
Peregrine Diamonds Ltd.Peregrine dat a suggest Chidliak CH-7, CH-6 increases. New microdiamond dat a supports increased diamond content at CH-7 and the potential to add 2.5 to 3.1 million carats at CH-6.Peregrine Diamonds Limited, Nov. 17, 8p.Canada, Nunavut, Baffin IslandNews item - press release
DC201512-2451
2015
Peregrine Diamonds Ltd.Peregrine Diamonds arranges $ 7 million rights offering.Peregrine Diamonds Limited, Nov. 19, 2p.Africa, BotswanaNews item - press release
DS201507-0331
2015
Persikov, E.S., Bukhtiyarov, P.G., Sokol, A.G.Change in the viscosity of kimberlite and basaltic magmas during their origin and evolution ( prediction).Russian Geology and Geophysics, Vol. 56, pp. 885-892.Canada, Northwest Territories, RussiaDeposit - Jericho, Udachnaya
DC201506-1666
2015
Petra Diamonds LimitedDiamond miners agree to form a diamond producers association. Alrosa, De Beers, Rio Tinto, Dominion, Lucara, Petra, Gem DiamondsPetra Diamonds Limited, May 28, 1p.GlobalNews item - press release
DC201507-1663
2015
Petra Diamonds LimitedDiamond miners agree to form a diamond producers association.Petra Diamonds Limited, May 28, 1p.GlobalNews item - press release
DC201507-1664
2015
Petra Diamonds LimitedFY 2015 - market update ( diluted ore)Petra Diamonds Limited, June 12, 1p.Africa, South AfricaNews item - press release
DC201508-1665
2015
Petra Diamonds LimitedTrading update for the year ended 30 June 2015 FY 2016 guidance update.Petra Diamonds Limited, July 27, 2p.Africa, South AfricaNews item - press release
DC201510-2362
2015
Petra Diamonds LimitedPreliminary results announcement for the year ended 30 June 2015. Declaration of maiden dividend.Petra Diamonds Limited, Sept. 18, 4p.Africa, South AfricaNews item - press release
DC201512-2452
2015
Petra Diamonds LimitedTrading update - Q1 FY 2016 production and sales report.Petra Diamonds Limited, Oct. 28, 3p.Africa, South AfricaNews item - press release
DC201512-2453
2015
Petra Diamonds LimitedRecovery of 23 carat pink diamond at Williamson.Petra Diamonds Limited, Nov. 27, 1p.Africa, TanzaniaNews item - press release
DS201506-0290
2015
Petra Diamonds LimitedCullinan: The world's most celebrated diamond mine.Petra Diamonds Limited, petradiamonds.com March 20 pptAfrica, South AfricaDeposit - Cullinan - history
DS201502-0090
2015
Petrus, J.A., Ames, D.E., Kamber, B.S.On the track of the elusive Sudbury impact: geochemical evidence for a chondrite or comet bolide.Terra Nova, Vol. 27, 1, pp. 9-20.Canada, OntarioMeteorite
DS201506-0291
2015
Phani, P.R.C.Area selection for diamond exploration based on geological and morphostructural set-up: examples from Wajrakarur kimberlite field, India.Journal of Advanced chemical sciences, Vol. 1, 3, pp. 102-106.IndiaDeposit - Wajrakarur
DC201511-2403
2015
Phosphate Australia LimitedBlin a diamond project, Ellendale WA: acquisition. Alluvials and lamproite pipesPhosphate Australia Limited, Oct. 9, 21p.AustraliaNews item - press release
DS201511-1867
2015
Pilet, S.Generation of low-silica alkaline lavas: petrological constraints, models, and thermal implications.Geological Society of America Special Paper, No. 514, pp. SPE14-17.MantleMelting, metasomatism

Abstract: Various hypotheses for the origin of alkaline sodic mafic magmas have been proposed. This diversity of models is mainly related to the various constraints used to develop them. The goal of this paper is to test these different models using petrological and geochemical constraints in an attempt to understand why alkaline sodic rocks are so similar even while their environment of formation varies from oceanic to continental rift. Incompatible trace-element contents of alkaline basalts from ocean islands and continents show that the sources of these rocks are more enriched than primitive mantle. A fundamental question then is how the sources of alkaline rocks acquire these trace-element enrichments. Recycled oceanic crust, with or without sediment, is often invoked as a source component of alkaline magmas to account for their trace-element and isotopic characteristics. However, the fact that melting of oceanic crust produces silica-rich liquids seems to exclude the direct melting of eclogite derived from mid-ocean-ridge basalt to produce alkaline lavas. Recycling oceanic crust in the source of alkaline magma requires either (1) that the mantle "digests" this component producing metasomatized CO2-rich peridotitic sources or (2) that low-degree melt from recycled oceanic crust reacts with peridotite in the presence of CO2, producing low-silica alkaline melt by olivine dissolution and orthopyroxene precipitation. These two hypotheses are plausible in terms of major elements. However, they have specific implications about the type and proportion of recycled lithologies present in the asthenosphere to explain the specific trace-element pattern of intraplate alkaline lavas. A third hypothesis for the formation of alkaline magmas is the melting of metasomatized lithosphere. In this model, the major- and trace-element signature of alkaline magma is not controlled by the asthenospheric source (i.e., the amount of oceanic crust or CO2 present in the asthenosphere), but by the petrological process that controls the percolation and differentiation of low-degree asthenospheric melts across the lithosphere. This process forms amphibole-bearing metasomatic veins that are a candidate source of alkaline rocks. This hypothesis offers an explanation for the generation of the Na-alkaline lavas with similar major- and trace-element composition that are observed worldwide and for the generation of K- and Na-alkaline magma observed in continental settings. This hypothesis requires the formation of significant amounts of metasomatic veins within the lithosphere. Qualitative analyses of the thermal implication of the potential models for the generation of alkaline rocks demonstrate that such magma requires low potential temperature (Tp: 1320 °C to 1350 °C). If temperatures are higher, melting of the convecting mantle will erase any signature of low-degree melts produced from fertile mantle lithologies. This analysis suggests that a role for hot thermal plumes in the generation of intraplate volcanoes dominated by alkaline magmas is unrealistic.
DS201506-0292
2015
Pinti, D., Ishida, A., Takahata, N., Sano, Y.Carbon isotopes in a Juin a diamond with carbonate inclusions.Japan Geoscience Union Meeting, SCG16-05 May 28 abstractSouth America, BrazilDeposit - Juina
DS201506-0293
2015
PiperThe Precambrian supercontinent Palaeopangaea: two billion years of quasi-integrity and an appraisal of geological evidence.International Geology Review, Vol. 57, 11-12, pp. 1389-1417.GlobalPaleopangea
DS201503-0167
2015
Piper, J.D.A.Supercontinent integrity between 0.8 and 0.6 Ga: the nemesis of Rodinia?Geological Society of London Special Publication: Continent formation through time., No. 389, pp. 69-81.MantleRodinia
DS201503-0168
2015
Pirajno, F.Intracontinental anorogenic alkaline magmatism and carbonatites, associated mineral systems and the mantle plume connection. Brandberg, Erongo, Parana-Etendeka, Kruidfontein, GoudiniGondwana Research, Vol. 27, 3, pp. 1181-1216.Africa, East Africa, Namibia, South Africa, China, AustraliaCarbonatite
DS201510-1798
2015
Pirard, C., Hermann, J.Focused fluid transfer through the mantle above subduction zones.Geology, Vol. 43, 10, pp. 915-918.MantleSubduction

Abstract: Volcanic arcs above subduction zones are enriched in volatiles and fluid-mobile elements with respect to mid-oceanic ridge basalts. There is general consensus that this particular subduction zone signature is generated by fluid-induced extraction of these elements from subducted oceanic crust and its sedimentary cover. However, how these fluids are transferred through the mantle wedge to the locus of partial melting and what modification the fluids will experience is unresolved. Here we investigate the interaction of slab fluids with the mantle wedge through a series of high-pressure experiments. We explore two end-member processes of focused and porous reactive flow of hydrous slab melts through the mantle. Transfer by porous flow leads to the formation of hydrous minerals that sequester fluid-mobile elements and residual fluids characterized by trace element patterns inconsistent with typical arc lavas. In contrast, no hydrous minerals are formed in the reaction zone of experiments mimicking focused flow, and the typical trace element signature acquired during fluid extraction from the slab is preserved, indicating that this is an efficient process for element transfer through the mantle wedge.
DS201501-0026
2015
Pittari, A., Cas, R.A.F., Lefebvre, N., Kurszlaukis, S.Alteration styles in the Orion Central Volcanic Complex, Fort a la Corne kimberlite field, Saskatchewan, and their effects on primary volcaniclastic textures: implications for facies mapping and diamond exploration.Economic Geology, Vol. 110, pp. 146-171.Canada, SaskatchewanDeposit - Orion Central Volcanics
DS201509-0419
2015
Podvysotski, V.T., Bashinsli, S.I.A new dat a about Cretaceous Diamondiferous conglomerates in Juin a Province ( Mato Grosso state, Brazil).Vestnik VGU, Seria Geologia, IN RUSSIAN, No. 2, pp. 73-76.South America, Brazil, Mato GrossoDeposit - Juina area
DS201502-0091
2015
Poikilenko, N.P., Agashev, A.M., Litasov, K.D., Pokhilenko, L.N.Carbonatite metasomatism of peridotite lithospheric mantle: implications for diamond formation and carbonatite-kimberlite magmatism.Russian Geology and Geophysics, Vol. 56, 1, pp. 280-295.MantleCarbonatite
DS201503-0169
2015
Poirier, G.Renard: Quebec's first diamond mine.PDAC 2015, Abstract, 1p.Canada, QuebecDeposit - Renard
DS201512-1958
2015
Poitras, S.P.A geochemical study of diamond indicator minerals from the NWT interior platform.43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 86.Canada, Northwest TerritoriesGeochemistry

Abstract: The Central Mackenzie Valley (CMV) area of the Northwest Territories (NWT) comprises a Phanerozoic sedimentary basin that lies between the western margin of the Slave craton and the Cordillera. Although the region is considerably outside the bounds of the exposed Slave craton, both LITHOPROBE and more recent regional-scale surface wave studies (e.g., Priestley and McKenzie, 2006) indicate the likely presence of lithospheric mantle extending into the diamond stability field. Recent work conducted by Olivut Resources Ltd. led to the discovery of 29 kimberlites in the CMV. However, the indicator mineral chemistry of discovered kimberlites does not appear to be a good match (www.olivut.ca) with those during regional till and stream sediment sampling by the Geologic Survey of Canada (GSC) and Northwest Territories Geologic Survey (NTGS) in August 2003 and July 2005. We present new geochemical data on the regional indicator minerals with the aim of obtaining geotherm and depth of mantle sampling constraints on those indicator minerals discovered to date. A statistical evaluation of the data will compare the similarities to indicator mineral chemistry with parts of the Slave craton to evaluate whether the CMV indicators may ultimately be derived from that region. In total 3600 kimberlite indicator mineral grains were picked from the 0.25-2.0 mm size fractions. Peridotitic garnet grains dominate (46%), followed by magnesium ilmenite (26%), with decreasing individual proportions >15% of chromite, low-chrome diopside, olivine, chrome-diopside and eclogitic garnet. A sub-sample of these grains (3143) were analysed by EPMA. Garnet grains classify (after Grütter et al., 2004) as 1015 (62.1%) G9, 270 (16.5%) G11, 113 (6.9%) G10, 103 (6.3%) G12, 57 (3.5%) G1, 46 (2.8%) G10D, and the remaining 31 (1.9%) as G0, G3, G3D, G4, and G5. A sub-set of garnet grains (~700) were selected for LA-ICP-MS trace element analysis. Of the grains selected 74% G9, 14% G10 (and G10D), and 8% G11, with only 4% G12 and G0 (Grütter et al., 2004). Nickel concentrations from these grains range from 2.6-168.2 ppm, with the majority (>80%) between 20-100 ppm, yielding TNi (Canil, 1999) values ranging from 643-1348°C, with the majority between ~1000-1200°C. Using a central Slave craton geothermal gradient (Hasterok and Chapman, 2011), equilibration pressures for these garnet grains range from 20-80 kbars with the majority between 40-60 kbars (120-185 km). Preliminary analysis has 581 (81%) of the erupted peridotitic mantle garnet grains plotting within the diamond stability field (Kennedy and Kennedy, 1976). Of the 128 clinopyroxene grains analysed, only a few represent garnet peridotite (lherzolite) facies KIM clinopyroxene grains following compositional screening. Thermobarometry of these grains (Nimis and Taylor, 2000), assuming they were all derived from the same lithospheric section, yields P-T arrays identical to the central Slave geotherm that was 220 km thick at the time of eruption. These results are encouraging for diamond exploration. We thank Overburden Drilling Management Ltd. for grain picking and recovery of the small diamond, SGS Lakefield Research for mounting grains, and the GSC for probing of the grains.
DS201509-0420
2015
Poli, S.Carbon mobilized at shallow depths in subduction zones by carbonatitic liquids.Nature Geoscience, Vol. 8, pp. 633-636.MantleCarbonatite

Abstract: More than half a gigaton of CO2 is subducted into Earth’s interior each year1. At least 40% of this CO2 is returned to the atmosphere by arc volcanism2, 3, 4. Processes that are known to release carbon from subducting slabs—decarbonation or carbonate dissolution in fluids—can account for only a portion of the CO2 released at arc volcanoes5. Carbonatitic liquids may form from the subducting crust, but are thought to form only at very high temperatures. Melting of carbonated rocks could restrict the subduction of carbon into the deeper Earth. However, the behaviour of such rock types in subduction zones is unclear. Here I use laboratory experiments to show that calcium-rich hydrous carbonatitic liquids can form at temperatures as low as 870 to 900 °C, which corresponds to shallow depths of just 120 km beneath subduction zone arcs, in warm thermal regimes. I find that water strongly depresses the solidus for hydrous carbonate gabbro and limestone rocks, creating carbonatitic liquids that efficiently scavenge volatile elements, calcium and silicon, from the slab. These extremely mobile and reactive liquids are expected to percolate into the mantle wedge, and create a CO2 source for subduction zone magmatism. Carbonatitic liquids thus provide a potentially significant pathway for carbon recycling at shallow depths beneath arcs.
DS201504-0213
2015
Prescher, C., Dubrovinsky, L., Bykova, E., Kupenko, I., Glazyrin, K.High Poisson's ration of Earth's inner core explained by carbon alloying.Nature Geoscience, Vol. 8, 3, pp. 220-223.MantleCore, carbon
DS201508-0372
2015
Presser, J.Kalahari Craton, Yakutia craton area - seismic tomography.[email protected], 3 images dvs inverted x-1 pdfs availableAfricaMap - kimberlites
DS201509-0421
2015
Presser, J.Mantle tomography - Cullinan[email protected], pdf fileAfrica, South AfricaDeposit - Cullinan
DS201509-0422
2015
Presser, J.Mantle tomography Itapoti diamond area [email protected], pdf fileSouth America, ParaguayGeophysics - seismics
DS201511-1868
2015
Presser, J.Orapa - example using seismics[email protected], 1p. AvailableAfrica, BotswanaGeophysics - Orapa
DS201511-1869
2015
Presser, J.International Mir - example using seismics[email protected], 1p. AvailableRussiaGeophysics - Mir
DS201512-1959
2015
Presser, J.Botswana showing pipe locations,[email protected], 1 pdf availableAfrica, BotswanaGeophysics - pipes
DM201503-2480
2015
Proactive InvestorsDiamondCorp's progress on underground mine lauded by brokers. Laceproactiveinvestores.co.uk, Jan. 28, 1/2p.Africa, South AfricaNews item - DiamondCorp
DM201504-0925
2015
Purcell, W.Sandstorm Gold Ltd. Paid $52.5 million US to Iamgold Corp. for its 1 % gross proceeds royalty on Diavik mine. ( Iamgold has been receiving $ 7 or 8 million an year from it)Stockwatch Summary for March 23, Mar. 24, 1/4p.Canada, Northwest TerritoriesNews item - Diavik
DM201506-2472
2015
Purcell, W.92 Resources Corp. intends to acquire "certain rights" om a diamond prospect in Finland. Stockwatch Diamonds & Specialty Minerals, Summary April 27, 2p.Europe, FinlandNews item - 92 Resources
DC201501-1669
2014
Pure Grown DiamondsPure Grown Diamonds announces a scientific breakthrough .. Largest laboratory-cultivated white diamond 3.04 carats.Pure Grown Diamonds, Dec. 8, 1p.TechnologyNews item - press release
DC201508-1670
2015
Pure Grown DiamondsPure Grown Diamonds wins 2015 Eco-Excellence award.Pure Grown Diamonds, July 23, 1p.TechnologyNews item - press release
DS201510-1799
2014
Pushkarev, Y.D.Fundamental problems of the Earth evolution and the nature of D" layer as one of them.Deep-seated magmatism, its sources and plumes, Proceedings of XIII International Workshop held 2014., Vol. 2014, pp. 104-123.MantleGeodynamics
DM201504-0926
2014
Quenneville, G.They're back: History of diamond exploration - who will find diamond mine no. 5?Up Here Business Magazine, November pp. 23-26,28-30, 32, 38, 50.Canada, Northwest Territories, NunavutNews item - history
DS201507-0332
2015
Quere, S., Lowman, S., Arkani-Hamed, J.P.Subcontinental sinking slab remnants in a spherical geometry mantle model.Journal of Geophysical Research, Vol. 118, 4, pp. 1760-1777.MantleSubduction
DC201512-2454
2015
Raiman RocksRare fancy pink diamond and fancy blue diamond unveiled from the "rare diamonds of the world" collection. Pink Flame Type 11a and Ocean Blue… Type 11bRaimanRocks.com , Nov. 10, 1p.TechnologyNews item - diamond notable
DS201503-0170
2015
Rakhmanova, M.I., Nadolinny, V.A., Yuryeva, O.P., Pokhilenko, N.P., Logvinova, A.M.Pecularities of nitrogen impurity aggregation in diamonds from the Sytykanskaya pipe, Yakutia.European Journal of Mineralogy, Vol. 27, pp. 51-56.Russia, YakutiaDeposit - Sytykanskaya
DM201501-0927
2014
Rapaport MagazineBotswana's diamond landscape. Trading centre, goal of jewelery manufacturing, expanding Jwaneng, rough selling, ODCRapaport Magazine, December, 5p.Africa, BotswanaNews item - ODC
DM201501-0928
2014
Rapaport MagazineDesigning women.. History of women paving the way forward from Victorian era … Maker & Muse: women and Early Twentieth Century Art Jewelry exhibit in Chicago opens Feb. 14, 2015.Rapaport Magazine, December, 3p.GlobalNews item - history
DM201501-0929
2014
Rapaport MagazineLiquidity concerns… diamond markets, stable US demand, rough trends, Rapaport Magazine, December, 3p.GlobalNews item - economics
DM201501-0930
2014
Rapaport MagazineA more accessible De Beers. Simpler, more stringent contract, right goods in the right hands, De Beers Botswana structure, sight and feesRapaport Magazine, December, 4p.GlobalNews item - De Beers
DM201510-2057
2015
Rapaport MagazineUdachny update .. Moves underground.Rapaport Magazine, Sept. 3p.RussiaNews item - Udachny
DM201510-2058
2015
Rapaport MagazineDiamond dream East vs West. Markets and marketing traditions.Rapaport Magazine, Sept. 5p.GlobalNews item - markets
DM201511-2154
2015
Rapaport MagazineKimberley Process: where is it now?Rapaport Magazine, Sept. 3p.GlobalNews item - KPCS
DM201511-2155
2015
Rapaport Magazine100 carat diamond club. History and comments on notable diamonds.Rapaport Magazine, Oct. 13, 6p.GlobalNews item - diamond notable
DS201509-0423
2014
Ratheesh-Kumar, R.T., Ishwar-Kumar, C., Windley, B., Razakamanana, T., Nair, R.R., Sajeev, K.India-Madagascar paleo-fit based on flexural isostasy of their rifted margins.Gondwana Research, Vol. 28, 2, pp. 581-600.India, Africa, MadagascarTectonics

Abstract: The present study contributes new constraints on, and definitions of, the reconstructed plate margins of India and Madagascar based on flexural isostasy along the Western Continental Margin of India (WCMI) and the Eastern Continental Margin of Madagascar (ECMM). We have estimated the nature of isostasy and crustal geometry along the two margins, and have examined their possible conjugate structure. Here we utilize elastic thickness (Te) and Moho depth data as the primary basis for the correlation of these passive margins. We employ the flexure inversion technique that operates in spatial domain in order to estimate the spatial variation of effective elastic thickness. Gravity inversion and flexure inversion techniques are used to estimate the configuration of the Moho/Crust-Mantle Interface that reveals regional correlations with the elastic thickness variations. These results correlate well with the continental and oceanic segments of the Indian and African plates. The present study has found a linear zone of anomalously low-Te (1-5 km) along the WCMI (~1680 km), which correlates well with the low-Te patterns obtained all along the ECMM. We suggest that the low-Te zones along the WCMI and ECMM represent paleo-rift inception points of lithosphere thermally and mechanically weakened by the combined effects of the Marion hotspot and lithospheric extension due to rifting. We have produced an India-Madagascar paleo-fit representing the initial phase of separation based on the Te estimates of the rifted conjugate margins, which is confirmed by a close-fit correlation of Moho geometry and bathymetry of the shelf margins. The matching of tectonic lineaments, lithologies and geochronological belts between India and Madagascar provide an additional support for the present plate reconstruction.
DS201501-0027
2015
Read, G.Star-Orion South diamond project: optimizing a feasibility study.PDAC 2015, 1p. AbstractCanada, SaskatchewanDeposit - Star-Orion South
DS201504-0214
2010
Reidel, F., Dehler, M.Recovery of unliberated diamonds by x-ray transmission sorting. Earlier paper with size range +8mmThe South African Institute of Mining and Metallurgy, pp. 193-201.TechnologyDiamond recovery
DS201509-0424
2015
RenfroDigital photomicrography for gemologists.Gems & Gemology, Summer pp. 144-159.TechnologyPhotomicrography

Abstract: Until recently, film was the preferred medium used for capturing images through the microscope, primarily due to resolution limitations of digital-format cameras. The image quality that can now be achieved by digital cameras is equal, and in many ways superior, to the quality offered by film. Digital photomicrography allows gemologists the opportunity to instantly see the resultant images, which can then be adjusted with image-refining software so that they represent their subject as realistically as possible. This article offers examples of some basic techniques and tips on the application of digital processing to get the most out of photomicrographs.
DS201511-1870
2015
Renfro, N.The application of differential interference contrast microscopy to gemmology.Journal of Gemmology, Vol. 34, 7, pp. 616-622.TechnologyLuminescence
DC201510-2363
2015
Republic of MiningDe Beers and Attawapiskat .. After the Last River screens at Bay Street Film Festival in Thunder Bay. Video on website republicofmining.comCBC News , Sept. 10, 1p.Canada, OntarioNews item - Victor
DM201512-2262
2015
Republic of Mining10 billionaires and Leonardo DiCaprio just invested in a start up that claims it can grow hundreds of real diamonds in 2 weeks. Diamond Foundrybusiness insider.com, Nov. 11, 2p.TechnologyNews item - synthetics
DM201512-2263
2015
Republic of MiningIn diamond city, slowdown is not forever - Surat.TimesofIndia.com, Nov. 21, 1p.IndiaNews item - Surat
DM201512-2264
2015
Republic of MiningBotswana explores a future without sparklers.Businessdaylive.co.za, Nov. 23, 1p.Africa, BotswanaNews item - economics
DM201512-2265
2015
Republic of MiningRough diamond bubble bust ( Part 2) M. Rapaport.Mineweb.com, Nov. 25, 1p.GlobalNews item - rough markets
DM201508-2473
2015
Research and MarketsAnalyzing the major diamond mines worldwide 2015. In depth 29 mines analyzed.research and markets.com, July $ 750.00 a copy GlobalNews item - mines
DM201510-2059
2015
Resource ClipsBirks unveils the biggest diamond ever mined in Canada. North Star 15.1 carat.Resourceclips.com, Sept. 10, 1p.Canada, Northwest TerritoriesNews item - North Star
DM201511-2156
2015
Resource ClipsStornoway expands resources while building Quebec's first diamond mine.Resource Clips, Sept. 29, 3p.Canada, QuebecNews item - Stornoway
DM201511-2157
2015
Resource ClipsKimberley Process indicted. Tougher measures needed to end conflict diamond trade, says Amnesty International.Resource Clips, Sept. 30, 3p.Africa, Central African RepublicNews item - KP
DM201501-0931
2014
ReutersFinancing and marketing needed to spur diamond market growth - Bain.Reuters, Dec. 9, 1/2p.GlobalNews item - Bain
DM201502-0932
2014
ReutersChin a challenges India's polished diamond throne. Chin a getting rough from Africa.Reuters, Dec. 25, 1p.China, IndiaNews item - polishing
DM201503-0933
2015
ReutersRussian diamond miner Alrosa Q4 output up 8 % q/qReuters, Jan. 29, 1/4p.RussiaNews item - Alrosa
DM201503-0934
2015
ReutersRio Tinto may close Murowa diamond mine in Zimbabwe. Citing the regime of taxes announced by government.Reuters, Jan. 30, 1p.Africa, ZimbabweNews item - Rio Tinto
DM201503-0935
2015
ReutersEndiama to re-open idle mines Shiri Sangamina, Camafuca, Camazambo.Reuters, Jan. 16, 1/2p.Africa, AngolaNews item - Endiama
DM201503-0936
2015
ReutersDe Beers diamond division becoming Anglo American's crown jewel.Reuters, Feb. 13, 1p.GlobalNews item - De Beers
DM201510-2061
2015
ReutersCameroon involved in Central Africa 'blood diamond' trade: U.N. experts - by Louis Charanneau .Republic of Mining blog, Sept. 2, 1p.Africa, Central African RepublicNews item - CSR
DM201512-2266
2015
ReutersOnce in a blue moon diamond could fetch up to $ 55 million Sotheby's 12.03 carat ( Culli nan mine)Reuters, Nov. 4, 2p.Africa, South AfricaNews item - diamond notable
DM201512-2267
2015
ReutersPink diamond nets $ 28.55 mln in healthy stone market - Christie's. The Sweet Josephine bought by Chinese client in Hong Kong.Reuters, Nov. 10, 1/4p.TechnologyNews item - diamond notable
DM201512-2268
2015
ReutersThe extremely rare and flawless "Blue Moon Diamond" sold for $48.4 millionReuters, Nov. 11, 1p.TechnologyNews item - diamond notable
DM201512-2269
2015
ReutersBrazil's Odebrecht to sell assets for investment capital ( possible stake in diamond mine in Africa).Reuters, Nov. 18, 1p.AfricaNews item - Odebrecht
DM201512-2270
2015
ReutersRough diamond prices need to fall - RapaportReuters, Nov. 26, 1p.GlobalNews item - prices
DS201512-1960
2015
Reutsky, V., Borzdov, Y., Palyanov, Y., Sokol, A., Izokh, O.Carbon isotope fractionation during experimental crystallization of diamond from carbonate fluid at mantle conditions.Contributions to Mineralogy and Petrology, Vol. 170, pp. 41-MantleHPHT

Abstract: We report first results of a systematic study of carbon isotope fractionation in a carbonate fluid system under mantle PT conditions. The system models a diamond-forming alkaline carbonate fluid using pure sodium oxalate (Na2C2O4) as the starting material, which decomposes to carbonate, CO2 and elementary carbon (graphite and diamond) involving a single source of carbon following the reaction 2Na2C2O4 ? 2Na2CO3 + CO2 + C. Near-liquidus behaviour of carbonate was observed at 1300 °C and 6.3 GPa. The experimentally determined isotope fractionation between the components of the system in the temperature range from 1300 to 1700 °C at 6.3 and 7.5 GPa fit the theoretical expectations well. Carbon isotope fractionation associated with diamond crystallisation from the carbonate fluid at 7.5 GPa decreases with an increase in temperature from 2.7 to 1.6 ‰. This trend corresponds to the function ?Carbonate fluid-Diamond = 7.38 × 106 T?2.
DS201502-0092
2015
Reutsky, V.N., Palyanov, Yu.N., Borzdov, Yu.M., Sokol, A.G.Isotope fractionation of carbon during diamond cystallization in model systems.Russian Geology and Geophysics, Vol. 56, 1-2, pp. 239-244.TechnologyDiamond morphology
DS201505-0236
2015
Rey, P.F.The geodynamics of mantle melting.Geology, Vol. 43, 4, pp. 367-368.MantleMelting
DS201508-0373
2015
Robert, F.Relevance and importance of research in mineral exploration.SEG Newsletter, No. 102, July, p. 7.TechnologyNot specific to diamonds but interesting reading!
DS201503-0171
2015
Roberts, N.M.W., Spencer, C.J.The zircon archives of continent formation through time.Geological Society of London Special Publication: Continent formation through time., No. 389, pp. 197-225.MantleGeochronology
DS201503-0172
2015
Roberts, N.M.W., Van Kranendonk, J., Parman, S., Clift, P.D.Continent formation through time.Geological Society of London Special Publication: Continent formation through time., No. 389, pp. 1-16.GlobalGeotectonics
DS201502-0093
2014
Robinson, P.T., Trumbull, R.B., Schmitt, A., Yang, J-S., Li, J-W., Zhou, M-F., Erzinger, J., Dare, S., Xiong, F.The origin and significance of crustal minerals in ophiolitic chromitites and peridotites.Gondwana Research, Vol. 27 2, pp. 486-506.Peridotite
DC201501-1672
2014
Rockwell Diamonds Inc.Rockwell reports tenth successive quarterly imrovement and record diamond production and sales revenue.Rockwell Diamonds Inc., Dec. 15, 2p.Africa, South AfricaNews item - press release
DC201502-1673
2015
Rockwell Diamonds Inc.Rockwell announces an acquisition which will expand its operating and resource footprint in the Middle Orange River region of South Africa. Bondeo 140 CC Rockwell Diamonds Inc., Jan. 6, 2p.Africa, South AfricaNews item - press release
DC201502-1674
2015
Rockwell Diamonds Inc.Rockwell delivers increase and lower operating costs in Q3 due to higher volumes processed but lower grades lead to rationalization of Saxendrift Hill Complex and focus on Niewejaarskraal expansion ahead of acquisition of contiguous MOR alluvial diamond aRockwell Diamonds Inc., Jan. 13, 5p.Africa, South AfricaNews item - press release
DC201504-1675
2015
Rockwell Diamonds Inc.Rockwell issuses update on resource estimates and other developments in the Middle Orange River diamond fields.Rockwell Diamonds Inc., Mar. 9, 9p.Africa, South AfricaNews item - press release
DC201505-1676
2015
Rockwell Diamonds Inc.Rockwell sells non-core Tirisano project for a cash consideration of $ 6.3 million and provides an update on its Middle Orange River exploration activities. The Consortium ( operating team)Rockwell Diamonds Inc., Mar. 30, 2p.Africa, South AfricaNews item - press release
DC201505-1677
2015
Rockwell Diamonds Inc.Rockwell announces its quarterly production and sales update for the three months ending Feb. 28, 2015. MOR, Saxebdrift, Niewejaarskraal, Tirisano, KwartelspanRockwell Diamonds Inc., Apr. 20, 7p.Africa, South AfricaNews item - press release
DC201506-1678
2015
Rockwell Diamonds Inc.Rockwell looks to conclude its recently announced acquisition of Remhoogte Holsloot operation.Rockwell Diamonds Inc., May 27, 1p.Africa, South AfricaNews item - press release
DC201507-1679
2015
Rockwell Diamonds Inc.Rockwell shelves equity finance for Remhoogte… in favour of bridging finance. Diacore and BristowMiningmx.com, May 29, 1p.Africa, South AfricaNews item - Rockwell
DC201507-1680
2015
Rockwell Diamonds Inc.Announces results for the three and twelve months ended February 28, 2015.Rockwell Diamonds Inc., May 28, 1p.Africa, South AfricaNews item - press release
DC201507-1681
2015
Rockwell Diamonds Inc.Rockwell looks to conclude its recently announced acquisition of Remhoogte/Holsloot.Rockwell Diamonds Inc., May 27, 1p.Africa, South AfricaNews item - press release
DC201507-1682
2015
Rockwell Diamonds Inc.Rockwell turns to the future after closing the Bondeo 140 CC acquisition.Rockwell Diamonds Inc., June 25, 4p.Africa, South AfricaNews item - press release
DC201508-1683
2015
Rockwell Diamonds Inc.Rockwell gets through a tough quarter with support from key shareholders and outlines future plans following recent Bondeo 140 cc acquisition.Rockwell Diamonds Inc., July 14, 5p.Africa, South AfricaNews item - press release
DC201510-2364
2015
Rockwell Diamonds Inc.Rockwell records higher grades and increased sales in Q2 off the back of the Remhoogte Holsloot Complex acquisition.Rockwell Diamonds Inc., Sept. 21, 5p.Africa, South AfricaNews item - press release
DC201511-2404
2015
Rockwell Diamonds Inc.Rockwell delivers Q2 bottom line profit.Rockwell Diamonds Inc., Oct. 15, 6p.Africa, South AfricaNews item - press release
DS201512-1961
2015
Romano, M., Cifelli, TR.L.100 years of continental drift.Science, Vol. 350, 6263, pp. 915-916.MantleHistory - drift

Abstract: Alfred Wegener (1880-1930) was a leading explorer, geophysicist, and meteorologist from Germany, and pioneer in the exploration of Greenland (1). His seminal volume of meteorology (2) is universally considered a fundamental manual for this discipline and was long a reference text for students and specialists. Wegener's preeminent scientific legacy, however, is the continental drift hypothesis. He first presented his thesis to the scientific community on 6 January 1912 at the Geological Society of Frankfurt am Main, but his famous monograph on the subject dates to 1915 (3).
DS201511-1871
2003
Rombouts, L.Assessing the diamond potential of kimberlites from discovery to bulk sampling.Mineralium Deposita, Vol. 38, pp. 496-504. Available pdfGlobalMicrodiamonds - responses

Abstract: The economic evaluation of diamond-bearing kimberlites is usually carried out in four stages. Expenditure tends to increase by an order of magnitude at each successive stage. At the end of each stage, the sample results should be critically appraised before deciding to proceed to the next phase. In the first stage, even before individual kimberlite bodies have been discovered, the indicator mineral geochemistry will give a first rough idea of the diamond potential. The relative abundance of harzburgitic pyropes (subcalcic chrome-rich) is often directly correlated with the diamond grade. In the next stage, when the kimberlite body has been discovered, a relatively small sample of a few hundred kilograms will be enough to recover sufficient microdiamonds to allow an extrapolation of the size distribution towards the commercial-sized diamonds and a rough estimate of their grade. If positive, the third stage should be a limited bulk sampling programme (order of 200 tonnes) to determine the commercial-sized diamond grade, expressed as carats per tonne. The aim of the final stage is to obtain a parcel of the order of 1,000 carats to estimate the average commercial value of the diamonds. The robustness and reliability of the grade and value estimates can be verified with extreme value analysis and by obtaining the confidence limits with bootstrapping.
DS201508-0374
2015
Rondenay, S.The LAB in Limbo-Seismological insights into the Lithosphere-Asthenosphere system at subduction zones.Seminar speaker July 21, U of T., 1/2p. Abstract available.MantleSubduction
DS201511-1872
2015
Roskin, G.A.Synthetic gem quality diamonds: the product, the perception and the retailer.GemGuide, Vol. 34, 4, pp. 8-10.TechnologySynthetics
DM201501-0977
2014
Rough-PolishedStellar ups diamond grade, resource for Dyke 1 to 1.45 carats.rough-polished.com, Dec. 1, 1/4p.Africa, Sierra LeoneNews item - Stellar
DM201501-0978
2014
Rough-PolishedKimberley gets environmental nod as it seeks Botswana's Lerala mine.rough-polished.com, Dec. 1, 1/4p.Africa, BotswanaNews item - Kimberley
DM201501-0979
2014
Rough-PolishedAlrosa to build the new "Burevesnik" innovation centre by 2017 for $ 26 million ( x ray equipment ).rough-polished.com, Dec. 4, 1/4p.RussiaNews item - Alrosa
DM201501-0980
2014
Rough-PolishedWe fully support Zimbabwe organizing tenders at home - AWDC boss.rough-polished.com, Dec. 1, 1/2p.Africa, ZimbabweNews item - First Element
DM201501-0981
2014
Rough-PolishedDebswana says 2014 a good year, revenue widens.rough-polished.com, Dec. 4, 1/4p.Africa, BotswanaNews item - Debswana
DM201501-0982
2014
Rough-PolishedStellar set to generate early cash flow from surface mining at Tongo Dyke-1.rough-polished.com, Dec. 4, 1/4p.Africa, GhanaNews item - Stellar
DM201501-0983
2014
Rough-PolishedDiamcor loss narrows.rough-polished.com, Dec. 3, 1/4p.Africa, South AfricaNews item - Diamcor
DM201501-0984
2014
Rough-PolishedZimbabwe ordered ZMDC to publish financial statements.rough-polished.com, Dec. 3, 1/4p.Africa, ZimbabweNews item - ZMDC
DM201501-0985
2014
Rough-PolishedAnalysts at Barclay's Capital raised the target price for Alrosa's stock saying to buy. rough-polished.com, Dec. 2, 1/4p.RussiaNews item - Alrosa
DM201501-0986
2014
Rough-PolishedDat a exchange between Belgium and Chin a on rough diamond trade now fully automated.rough-polished.com, Dec. 2, 1/4p.Europe, Belgium, ChinaNews item - legal
DM201501-0987
2014
Rough-PolishedDebswana recovers first stones from Jaweng tailings.rough-polished.com, Dec. 5, 1/4p.Africa, BotswanaNews item - Debswana
DM201501-0988
2014
Rough-PolishedBotswana diamond manufacturers up in arms with government over levy.rough-polished.com, Dec. 5, 1/4p.Africa, BotswanaNews item - legal
DM201501-0989
2014
Rough-PolishedOur goal is to create a think tank, which will come up with ideas how to reach outside our closed circuit and bring people the message about diamonds, tell them why they should buy them. rough-polished.com, Dec. 8, 1p.GlobalNews item - WDMF
DM201501-0990
2014
Rough-PolishedLeaders to deliberate on marketing and financing of global diamond industry.rough-polished.com, Dec. 8, 1/4p.GlobalNews item - WDMF
DM201501-0991
2014
Rough-PolishedPetra's BEE partners settle loans.rough-polished.com, Dec. 8, 1/4p.Africa, South AfricaNews item - Petra
DM201501-0992
2014
Rough-PolishedDiamcor sells almost 3,500 carats in Q2 2015 Krone-Endorarough-polished.com, Dec. 8, 1/4p.Africa, South AfricaNews item - Diamcor
DM201501-0993
2014
Rough-PolishedAlrosa held a meeting with long-term clients… market perspective.rough-polished.com, Dec. 9, 1/4p.RussiaNews item - Alrosa
DM201501-0994
2014
Rough-PolishedAlrosa will take part in bidding for the right to mine diamonds at Molodo in Yakutia. Alluvialsrough-polished.com, Dec. 9, 1/4p.RussiaNews item - Alrosa
DM201501-0995
2014
Rough-PolishedBelgian court rules in favour of Zim, dislodges attachment of gems worth over $ 45 million by Amari ( Marange)rough-polished.com, Dec. 9, 1/4p.Africa, ZimbabweNews item - Amari
DM201501-0996
2014
Rough-PolishedAlrosa sold a diamond for $ 1.8 million at Sotheby's 47.48 carats.rough-polished.com, Dec. 11, 1/4p.RussiaNews item - Alrosa
DM201501-0997
2014
Rough-PolishedIndian government confirms proposal for SNZ for rough diamonds. ( Special Notified Zone)rough-polished.com, Dec. 11, 1/4p.IndiaNews item - SNZ
DM201501-0998
2014
Rough-PolishedDe Beers to produce up to 34 mln carats next year.rough-polished.com, Dec. 11, 1/4p.GlobalNews item - De Beers
DM201501-0999
2014
Rough-PolishedStellar acquires a $ 2mln bridging loan.rough-polished.com, Dec. 11, 1/4p.Africa, GuineaNews item - Stellar
DM201501-1000
2014
Rough-PolishedNDTC pays $ 62 million in annual royalties to Namibia.rough-polished.com, Dec. 11, 1/4p.Africa, NamibiaNews item - NDTC
DM201501-1001
2014
Rough-PolishedLucara says Karowe to produce 400 k carats next year.rough-polished.com, Dec. 10, 1/4p.Africa, BotswanaNews item - Lucara
DM201501-1002
2014
Rough-PolishedAmari not giving up on Zim diamonds, appeals latest ruling.rough-polished.com, Dec. 10, 1/4p.Africa, ZimbabweNews item - Amari
DM201501-1003
2014
Rough-PolishedAlrosa supervisory board approves 2015 budget.rough-polished.com, Dec. 12, 1/4p.RussiaNews item - Alrosa
DM201501-1004
2014
Rough-PolishedAlrosa inks agreement with 12 Indian companies for direct rough supply.rough-polished.com, Dec. 12, 1/4p.Russia, IndiaNews item - Alrosa
DM201501-1005
2014
Rough-PolishedZim diamond miners accused of tax evasion. Marangerough-polished.com, Dec. 12, 1/4p.Africa, ZimbabweNews item - legal
DM201501-1006
2014
Rough-PolishedLucapa records more exceptional diamond grades at Lulo.rough-polished.com, Dec. 12, 1/4p.Africa, AngolaNews item - Lucapa
DM201501-1007
2014
Rough-PolishedKiran Gems signs long term supply contract with Alrosa at WDC.rough-polished.com, Dec. 16, 1/4p.RussiaNews item - Alrosa
DM201501-1008
2014
Rough-PolishedHistoric world diamond conference exceeds expectations.rough-polished.com, Dec. 16, 1/4p.IndiaNews item - WDC
DM201501-1009
2014
Rough-PolishedAngola earns $ 6.5 billion in 9 months from diamond revenue.rough-polished.com, Dec. 16, 1/4p.Africa, AngolaNews item - economics
DM201501-1010
2014
Rough-PolishedRockwell production, revenue continues to go up.rough-polished.com, Dec. 16, 1/4p.Africa, South AfricaNews item - Rockwell
DM201501-1011
2014
Rough-PolishedAlrosa announced liquidity improvement measures.rough-polished.com, Dec. 15, 1/4p.RussiaNews item - Alrosa
DM201501-1012
2014
Rough-PolishedDemand for diamonds in the world is very high - AWDC. ( Antwerp)rough-polished.com, Dec. 15, 1p.GlobalNews item - economics
DM201501-1013
2014
Rough-PolishedDiamond industry organizations to struggle against conflict diamonds.rough-polished.com, Dec. 15, 1/4p.GlobalNews item - KP
DM201501-1014
2014
Rough-PolishedDominion Diamond revenue soared 50% in Q3 2015 financial year.rough-polished.com, Dec. 15, 1/4p.Canada, Northwest TerritoriesNews item - Dominion
DM201501-1015
2014
Rough-PolishedKristall will buy 11,500 carats of rough diamonds in the course of one month.rough-polished.com, Dec. 17, 1/4p.RussiaNews item - Kristall
DM201501-1016
2014
Rough-PolishedAlrosa expects profits to decline 2.6 times in 2014 due to weakened ruble.rough-polished.com, Dec. 19, 1/4p.RussiaNews item - Alrosa
DM201501-1017
2014
Rough-PolishedKristall production corporation OAO makes an exclusive offer at its online marketplace.rough-polished.com, Dec. 19, 1/4p.RussiaNews item - Kristall
DM201501-1018
2014
Rough-PolishedRising diamond revenues helping Angola offset dropping oil income.rough-polished.com, Dec. 19, 1/4p.Africa, AngolaNews item - Endiama
DM201501-1019
2014
Rough-PolishedDiamond output of Severalmaz will exceed 1.6 million carats by the end of the year.rough-polished.com, Dec. 18, 1/4p.RussiaNews item - Severalmaz
DM201502-1020
2014
Rough-PolishedThe Diamond Valley project in Yakutsk will not be implemented. rough-polished.com, Dec. 24, 1/4p.RussiaNews item - Diamond Valley
DM201502-1021
2014
Rough-PolishedLucara to offload Lesotho's Mothae asset.rough-polished.com, Dec. 24, 1/4p.Africa, LesothoNews item - Lucara
DM201502-1022
2014
Rough-PolishedScio Diamond Technology gets $ 2.5 million growth funding.rough-polished.com, Dec. 24, 1/4p.TechnologyNews item - Scio
DM201502-1023
2014
Rough-PolishedWeak ruble may diminish diamond prices by 2-5 percent.rough-polished.com, Dec. 23, 1/4p.RussiaNews item - economics
DM201502-1024
2014
Rough-PolishedNamibia's Q3 diamond output slides. Fell by 12.3 % to 446,637 caratsrough-polished.com, Dec. 22, 1/4p.Africa, NamibiaNews item - Namdeb
DM201502-1025
2014
Rough-PolishedLucapa to start mining alluvial diamonds at Angola's Lulo next month.rough-polished.com, Dec. 22, 1/4p.Africa, AngolaNews item - Lucapa
DM201502-1026
2014
Rough-PolishedBy next March, Alrosa plans to bring its foreign currency assets to the level of October 2014.rough-polished.com, Dec. 29, 1/4p.RussiaNews item - Alrosa
DM201502-1027
2014
Rough-PolishedGSI opens new lab in Botswana.rough-polished.com, Dec. 29, 1/4p.Africa, BotswanaNews item - GSI
DM201502-1028
2014
Rough-PolishedAnother kimberlite pipe found in Anantapur district in India. KL-7rough-polished.com, Dec. 29, 1/4p.India, Andhra PradeshNews item - Kalyandurg
DM201502-1029
2014
Rough-PolishedSurat may have a new diamond bourse in 4 years.rough-polished.com, Dec. 29, 1/4p.IndiaNews item - Surat
DM201502-1030
2014
Rough-PolishedAlrosa wins auction for Molodo diamond placer.rough-polished.com, Dec. 26, 1/4p.RussiaNews item - Alrosa
DM201502-1031
2014
Rough-PolishedKennady Diamonds bulk sample indicates grade of 2.59 carats per tonne.rough-polished.com, Dec. 26, 1/4p.Canada, Northwest TerritoriesNews item - Kennady
DM201502-1032
2014
Rough-PolishedDiamcor Mining to raise $ 3 million in private stock placement.rough-polished.com, Dec. 26, 1/4p.Africa, South AfricaNews item - Diamcor
DM201502-1033
2014
Rough-PolishedWe are highly optimistic about increased demand in 2015 - Vipul Shahrough-polished.com, Dec. 26, 1/4p.GlobalNews item - GJEPC
DM201502-1034
2014
Rough-PolishedU.S. online Christmas ecommerce spending + 15% to $ 48 billion.rough-polished.com, Dec. 25, 1/4p.Global, United StatesNews item - economics
DM201502-1035
2014
Rough-PolishedEPL Diamond will continue to buy rough from Alrosa.rough-polished.com, Dec. 31, 1/4p.RussiaNews item - Alrosa
DM201502-1036
2014
Rough-PolishedLukoil plans to produce 2 million carats of rough in 2015.rough-polished.com, Dec. 31, 1/4p.RussiaNews item - Lukoil
DM201502-1037
2015
Rough-PolishedDiamonds lend class, grandeur and style to any outfit and occasion.rough-polished.com, Jan. 5, 1p.IndiaNews item - diamond
DM201502-1038
2015
Rough-PolishedAngola's Catoca says 2014 was a difficult year, outlines priorities for 2015.rough-polished.com, Jan. 12, 1/4p.Africa, AngolaNews item - Catoca
DM201502-1039
2015
Rough-PolishedStellar recovers diamond ore grade of 15 cpht from Baoule trial mining.rough-polished.com, Jan. 12, 1/4p.Africa, GuineaNews item - Stellar
DM201502-1040
2015
Rough-PolishedRussia will develop the Sestroretsk diamond pipe. Discussion is about INREAL and synthetics.rough-polished.com, Jan. 12, 1p.RussiaNews item - Inreal
DM201502-1041
2015
Rough-PolishedThe Ghaghoo narrative.rough-polished.com, Jan. 15, 1p.Africa, BotswanaNews item - Gem Diamonds
DM201502-1042
2015
Rough-PolishedA happier year ahead?rough-polished.com, Jan. 14, 1/4p.GlobalNews item - prices and liquidity
DM201502-1043
2015
Rough-PolishedDiamond producers fear competition as consumers find new best friends.rough-polished.com, Jan. 13, 1/4p.GlobalNews item - markets
DM201502-1044
2015
Rough-PolishedDiamond beneficiation seen as potential answer to Zim's economic malaise.rough-polished.com, Jan. 15, 1/4p.Africa, ZimbabweNews item - polishing
DM201502-1045
2015
Rough-PolishedCredit Suisse evaluates Alrosa market perspective high.rough-polished.com, Jan. 14, 1/4p.RussiaNews item - Alrosa
DM201502-1046
2015
Rough-PolishedAnalytics: Synthetic diamonds: response adequate to challenge.rough-polished.com, Jan. 14, 1p.TechnologyNews item - synthetics
DM201502-1047
2015
Rough-PolishedBarclays Capital analytics raised the traget price of Alrosa securities.rough-polished.com, Jan. 16, 1/4p.RussiaNews item - Alrosa
DM201502-1048
2015
Rough-PolishedTax returns on diamond mining in Arkhangelsk region soared six fold in 2014.rough-polished.com, Jan. 16, 1/4p.Russia, Archangel, Kola PeninsulaNews item - economics
DM201502-1049
2015
Rough-PolishedRio Tinto's Chief Executive presses Indian PM for Bunder project approval.rough-polished.com, Jan. 16, 1/4p.IndiaNews item - Rio Tinto
DM201502-1050
2015
Rough-PolishedFirst Ghaghoo tender by Gem Diamonds in Antwerp.rough-polished.com, Jan. 19, 1/4p.Africa, BotswanaNews item - Gem Diamonds
DM201502-1051
2015
Rough-PolishedWorld diamond market is driven by globalization. Marcel Zalc.rough-polished.com, Jan. 19, 1p.GlobalNews item - markets
DM201502-1052
2015
Rough-PolishedRough diamond demand by Zim cutters remain 'very low'.rough-polished.com, Jan. 20, 1/4p.Africa, ZimbabweNews item - cutting
DM201502-1053
2015
Rough-PolishedAngola to re-open diamond cutting factory next month.rough-polished.com, Jan. 21, 1/4p.Africa, AngolaNews item - Sodiam
DM201502-1054
2015
Rough-PolishedRio Tinto's Zim diamond mine Q4' 2014 output drops. Murowarough-polished.com, Jan. 21, 1/4p.Africa, ZimbabweNews item - Rio Tinto
DM201502-1055
2015
Rough-PolishedPolished diamond demand in Russia grew 62% in December.rough-polished.com, Jan. 21, 1/4p.RussiaNews item - Kristall
DM201502-1056
2015
Rough-PolishedAngola's Endiama expects new 'large' diamond deposit recovery in Angola. rough-polished.com, Jan. 23, 1/4p.Africa, AngolaNews item - Endiama
DM201502-1057
2015
Rough-PolishedIndia to develop contacts with Russian diamond companies.rough-polished.com, Jan. 26, 1/4p.India, RussiaNews item - markets
DM201502-1058
2015
Rough-PolishedSunergy prepares for second diamond parcel sale, Sierra Leonean operation expansion.rough-polished.com, Jan. 26, 1/4p.Africa, Sierra LeoneNews item - Sunergy
DM201503-1059
2015
Rough-PolishedAlrosa conveys condolences on the passing of Fyodor Andreev.rough-polished.com, Jan. 30, 1/4p.RussiaNews item - Alrosa
DM201503-1060
2015
Rough-PolishedParagon signs a $ 12 m equity, debt finance package for Lemphane.rough-polished.com, Jan. 30, 1/4p.Africa, LesothoNews item - Paragon
DM201503-1061
2015
Rough-PolishedAlrosa Group performance in 2014: output reached 36.21 million carats, sales $ 5.05 billion.rough-polished.com, Jan. 29, 1/4p.RussiaNews item - Alrosa
DM201503-1062
2015
Rough-PolishedLucapa commences alluvial diamond mining at Lulo concession.rough-polished.com, Jan. 29, 1/4p.Africa, AngolaNews item - Lucapa
DM201503-1063
2015
Rough-PolishedJay kimberlite deposit to extend Ekati life cycle.rough-polished.com, Jan. 29, 1/4p.Canada, Northwest TerritoriesNews item - Dominion
DM201503-1064
2015
Rough-PolishedIsraeli diamond bourse leaders meet with De beers delegation.rough-polished.com, Jan. 29, 1/4p.Europe, IsraelNews item - De Beers
DM201503-1065
2015
Rough-PolishedA new platform for diamond e-commerce. Www.asapodiamonds.comrough-polished.com, Jan. 29, 1/4p.GlobalNews item - asapodiamnds
DM201503-1066
2015
Rough-PolishedZim's plans to merge Marange diamond firms facing resistence.rough-polished.com, Jan. 28, 1/4p.Africa, ZimbabweNews item - Marange
DM201503-1067
2015
Rough-PolishedSarine and HRD Antwerp to offer interoperability of computerized systems.rough-polished.com, Jan. 28, 1/4p.TechnologyNews item - Sarine
DM201503-1068
2015
Rough-PolishedAlrosa on the top of Corporate Social Responsibility list of Russian companies in January.rough-polished.com, Jan. 27, 1/4p.RussiaNews item - Alrosa
DM201503-1069
2015
Rough-PolishedLUKOIL diamond project to pay off in 5-6 years. Gribrough-polished.com, Feb. 3, 1/4p.Russia, Kola Peninsula, ArchangelNews item - LuKOIL
DM201503-1070
2015
Rough-PolishedMarange diamond miners rapped for failure to develop local communities.rough-polished.com, Feb. 3, 1/4p.Africa, ZimbabweNews item - Marange
DM201503-1071
2015
Rough-PolishedDiamonds to fund a third of Botswana's state budget.rough-polished.com, Feb. 4, 1/4p.Africa, BotswanaNews item - economics
DM201503-1072
2015
Rough-PolishedAngola, U.S. pledge to enforce KP core principles.rough-polished.com, Feb. 4, 1/4p.Africa, Angola, United StatesNews item - KP
DM201503-1073
2015
Rough-PolishedThe biggest polished synthetic diamond was created in Russia 10.31 IIa type.rough-polished.com, Feb 2, 1/4p.TechnologyNews item - synthetics
DM201503-1074
2015
Rough-PolishedAlrosa to cut on diamond stockpile, reduce credit burden in 2015.rough-polished.com, Feb. 5, 1/4p.RussiaNews item - Alrosa
DM201503-1075
2015
Rough-PolishedAngola re-opens diamond cutting, polishing factory. Sodiam rough-polished.com, Feb. 5, 1/4p.Africa, AngolaNews item - Sodiam
DM201503-1076
2015
Rough-PolishedRio's Murowa mine to close weighed down by new tax regime.rough-polished.com, Feb. 5, 1/4p.Africa, ZimbabweNews item - Rio Tinto
DM201503-1077
2015
Rough-PolishedBotswana diamond cutter, Teemane Manufacturing is set to shut down its 20 year operations due to low prices.rough-polished.com, Feb. 5, 1/4p.Africa, BotswanaNews item - Teemane
DM201503-1078
2015
Rough-PolishedDiamond polishers await outcome of Namibia-De Beers talks.rough-polished.com, Feb. 9, 1/4p.Africa, NamibiaNews item - Debswana
DM201503-1079
2015
Rough-PolishedGrizzly discoveries updates on resource properties. Buffalo Head Hills.rough-polished.com, Feb. 9, 1/4p.Canada, AlbertaNews item - Grizzly
DM201503-1080
2015
Rough-PolishedKennedy Diamonds announces $ 16 million share placement. ( Can $20m)rough-polished.com, Feb. 12, 1/4p.Canada, Northwest TerritoriesNews item - press release
DM201503-1081
2015
Rough-PolishedSouth Africa to provide mining regulatory certainty.rough-polished.com, Feb. 12, 1/4p.Africa, South AfricaNews item - legal
DM201503-1082
2015
Rough-PolishedAngola's Endiama courts investors.rough-polished.com, Feb. 11, 1/4p.Africa, AngolaNews item - Endiama
DM201503-1083
2015
Rough-PolishedLomonosov diamond deposit in the Arkangelsk region produced 6 million carats of diamonds since 2005.rough-polished.com, Feb. 10, 1/4p.RussiaNews item - Lomonosov
DM201503-1084
2015
Rough-PolishedDe Beers says AMS has never mistaken natural diamonds for synthetic.rough-polished.com, Feb. 12, 1/4p.TechnologyNews item - De Beers
DM201503-1085
2015
Rough-PolishedSA State diamond trader buys less rough.rough-polished.com, Feb. 12, 1/4p.Africa, South AfricaNews item - Diamond Trader
DM201503-1086
2015
Rough-PolishedDiamond mining in India: projects developed by Vajra diamond mining. Charles Devenishrough-polished.com, Feb. 11, 3p.IndiaNews item - Vajra
DM201503-1087
2015
Rough-PolishedAngola says artisanal diamond miners produced 935,000 carats in 2014.rough-polished.com, Feb. 13, 1/4p.Africa, AngolaNews item - artisans
DM201503-1088
2015
Rough-PolishedRio Tinto registers 6 % in diamond revenues.rough-polished.com, Feb. 13, 1/4p.GlobalNews item - Rio Tinto
DM201503-1089
2015
Rough-PolishedDRC denies suspending mining code talks.rough-polished.com, Feb. 13, 1/4p.Africa, Democratic Republic of CongoNews item - legal
DM201503-1090
2015
Rough-PolishedDe Beers 2014 sales, production up.rough-polished.com, Feb. 16, 1/4p.GlobalNews item - De Beers
DM201503-1091
2015
Rough-PolishedRosgeologiya estimates inferred diamond resources in the Tarydakskaya area.rough-polished.com, Feb. 16, 1/4p.RussiaNews item - Rosgeologiya
DM201503-1092
2015
Rough-PolishedAngola's diamond reserves seen at 300 million carats.rough-polished.com, Feb. 16, 1/4p.Africa, AngolaNews item - Endiama
DM201503-1093
2015
Rough-PolishedNo correlation between Namibia-De Beers talks and sightholders contracts - Katalirough-polished.com, Feb. 16, 1/4p.Africa, NamibiaNews item - De Beers
DM201503-1094
2015
Rough-PolishedZambia digs in on mining royalties.rough-polished.com, Feb. 16, 1/4p.Africa, ZambiaNews item - legal
DM201503-1095
2015
Rough-PolishedBotswana minister against rescue package for diamond manufacturer. Teemanerough-polished.com, Feb. 18, 1/4p.Africa, BotswanaNews item - Teemane
DM201503-1096
2015
Rough-PolishedDe Beers says diamond prices to recover in Q2.rough-polished.com, Feb. 17, 1/4p.GlobalNews item - De Beers
DM201503-1097
2015
Rough-PolishedIndia interested in small Angolan diamonds.rough-polished.com, Feb. 17, 1/4p.IndiaNews item - Endiama
DM201503-1098
2015
Rough-PolishedNamdeb's contractor's workers strike over wages.rough-polished.com, Feb. 19, 1/4p.Africa, NamibiaNews item - Namdeb
DM201503-1099
2015
Rough-PolishedDe Beers to spend 3 Billion on diamond mining operations.rough-polished.com, Feb. 19, 1/4p.GlobalNews item - De Beers
DM201503-1100
2015
Rough-PolishedStellar ready for first Baoule diamond sale.rough-polished.com, Feb. 20, 1/4p.Africa, GuineaNews item - Stellar
DM201503-1101
2015
Rough-PolishedPetra boosts H1 revenue despite drop in output.rough-polished.com, Feb. 20, 1/4p.Africa, South AfricaNews item - Petra
DM201503-1102
2015
Rough-PolishedFancy coloured diamond index reflects stable prices in Q4 2014.rough-polished.com, Feb. 19, 1/4p.GlobalNews item - colored diamonds
DM201504-1103
2015
Rough-PolishedDominion's Q4 sales reached $ 240 million.rough-polished.com, Feb. 24, 1/4p.Canada, Northwest TerritoriesNews item - Dominion
DM201504-1104
2015
Rough-PolishedSarine Technologies reports a 15% revenue growth in 2014.rough-polished.com, Feb. 24, 1/4p.TechnologyNews item - Sarine
DM201504-1105
2015
Rough-PolishedLucara boosts full year revenues to $ 266 million. Karowerough-polished.com, Feb. 24, 1/4p.Africa, BotswanaNews item - Lucara
DM201504-1106
2015
Rough-PolishedAlrosa is one of the Russian companies most frequently mention in international media.rough-polished.com, Feb. 26, 1/4p.RussiaNews tem - Alrosa
DM201504-1107
2015
Rough-PolishedAlrosa plans to repay more than $ 1 billion in loans by end of 2015.rough-polished.com, Feb. 25, 1/4p.RussiaNews item - Alrosa
DM201504-1108
2015
Rough-PolishedZim minister says Marange diamonds have dramatically shrunk.rough-polished.com, Feb. 25, 1/4p.Africa, ZimbabweNews item - Marange
DM201504-1109
2015
Rough-PolishedNamibia De Beers talks scheduled to end in June.rough-polished.com, Feb. 24, 1p.Africa, NamibiaNews item - De Beers
DM201504-1110
2015
Rough-PolishedBotswana Diamonds, Alrosa focus exploration work on 3 Orapa licence areas.rough-polished.com, Feb. 27, 1/4p. Africa, BotswanaNews item - Botswana Diamonds
DM201504-1111
2015
Rough-PolishedPeregrine confirms a 8.57 million carat inferred resource at CH-6 kimberlite.rough-polished.com, Feb. 17, 1/4p.Canada, Nunavut, Baffin IslandNews item - Peregrine
DM201504-1112
2015
Rough-PolishedLucapa suspends trading ahead of announcement on funding. Lulorough-polished.com, Feb. 27, 1/4p. Africa, AngolaNews item - Lucapa
DM201504-1113
2015
Rough-PolishedSberbank CIB said Alrosa securities undervalued.rough-polished.com, Mar. 4, 1/4p.RussiaNews item - Alrosa
DM201504-1114
2015
Rough-PolishedClever people stole info on Zim diamonds hidden by De Beers - Mugabe.rough-polished.com, Mar. 4, 1/4p.Africa, ZimbabweNews item - De Beers
DM201504-1115
2015
Rough-PolishedStellar starts Antwerp rough tender.rough-polished.com, Mar. 4, 1/4p.Africa, GuineaNews item - Stellar
DM201504-1116
2015
Rough-PolishedRussian rough exports up 7.7% Ministry of Finance.rough-polished.com, Mar. 4, 1/4p.RussiaNews item - production
DM201504-1117
2015
Rough-PolishedRio Tinto streamlines organizational structure to drive greater value.rough-polished.com, Mar. 3, 1/4p.GlobalNews item - Rio Tinto
DM201504-1118
2015
Rough-PolishedNorth Arrow reports an update on Qilalugaq bulk sampling processing.rough-polished.com, Mar. 2, 1/4p.Canada, NunavutNews item - North Arrow
DM201504-1119
2015
Rough-PolishedLiquidity challenged Botswana diamond cutters to emerge stronger - official.rough-polished.com, Mar. 2, 1/4p.Africa, BotswanaNews item - cutting
DM201504-1120
2015
Rough-PolishedDiamonds from Trans Hex's Angola, SA mines fetch weak average prices.rough-polished.com, Mar. 6, 1/4p.Africa, Angola, South AfricaNews item - Trans Hex
DM201504-1121
2015
Rough-PolishedLucapa inks $ 15 million bridge finance facility, raises $ 4.8 m. Lulorough-polished.com, Mar. 6, 1/4p.Africa, AngolaNews item - Lucapa
DM201504-1122
2015
Rough-PolishedEx-Mbada workers demand terminal benefits, beseige company offices.rough-polished.com, Mar. 6, 1/4p.Africa, ZimbabweNews item - Mbada
DM201504-1123
2015
Rough-PolishedPangolin recovers more diamonds from Botswana's Malatswae project.rough-polished.com, Mar. 6, 1/4p.Africa, BotswanaNews item - Pangolin
DM201504-1124
2015
Rough-PolishedRio Tinto launches world first analytics excellence centre in India.rough-polished.com, Mar. 6, 1/4p.IndiaNews item - Rio Tinto
DM201504-1125
2015
Rough-PolishedZim gets back majority of diamonds previously withheld in Belgium.rough-polished.com, Mar. 6, 1/4p.Africa, ZimbabweNews item - legal
DM201504-1126
2015
Rough-PolishedMorgan Stanley doubled its estimate of Alrosa shares, confirming the 'buy' rating.rough-polished.com, Mar. 11, 1/4p.RussiaNews item - Alrosa
DM201504-1127
2015
Rough-PolishedWDMF lauds diamond mining industry promotion efforts.rough-polished.com, Mar. 11, 1/4p.GlobalNews item - WDMF
DM201504-1128
2015
Rough-PolishedAlrosa launches mining at Botuobinskaya kimberlte pipe.rough-polished.com, Mar. 10, 1/4p.RussiaNews item - Alrosa
DM201504-1129
2015
Rough-PolishedAlrosa, Botswana Diamonds restart exploration in Orapa.rough-polished.com, Mar. 10, 1/4p.Africa, BotswanaNews item - Alrosa, Botswana Diamonds
DM201504-1130
2015
Rough-PolishedNamibian GVt gets draft agreement on new sales deal with De Beers. Debswanarough-polished.com, Mar. 10, 1/4p.Africa, NamibiaNews item - Debswana
DM201504-1131
2015
Rough-PolishedAngola approves new artisanal diamond mining licences.rough-polished.com, Mar. 13, 1/4p.Africa, AngolaNews item - legal
DM201504-1132
2015
Rough-PolishedFirestone Diamonds loss narrows.rough-polished.com, Mar. 13, 1/4p.Africa, Lesotho, BotswanaNews item - Firestone
DM201504-1133
2015
Rough-PolishedAlrosa is major budget contributing company for Yakutia.rough-polished.com, Mar. 12, 1/4p.Russia, YakutiaNews item - Alrosa
DM201504-1134
2015
Rough-PolishedAlrosa may revise its low margin projects if diamond prices decline.rough-polished.com, Mar. 12, 1/4p.RussiaNews item - Alrosa
DM201504-1135
2015
Rough-PolishedSmolensk Kristall will sell diamonds worth RUB 3 billion to Gokran.rough-polished.com, Mar. 12, 1/4p.RussiaNews item - Kristall
DM201504-1136
2015
Rough-PolishedRockwell says Remhoogte to add 63,500 ct to its diamond inventory.rough-polished.com, Mar. 12, 1/4p.Africa, South AfricaNews item - Rockwell
DM201504-1137
2015
Rough-PolishedNMDC to SC for extension of Panna mining period.rough-polished.com, Mar. 12, 1/4p.IndiaNews item - NMDC
DM201504-1138
2015
Rough-PolishedAlrosa shares included in market vector Russia index.rough-polished.com, Mar. 17, 1/4p.RussiaNews item - Alrosa
DM201504-1139
2015
Rough-PolishedWorld's biggest diamond producers to converge at 2nd DDC.rough-polished.com, Mar. 17, 1/4p.GlobalNews item - Dubai Diamond Conference
DM201504-1140
2015
Rough-PolishedAnglo says De Beers exploration expenditure topped $ 37 million in 2014.rough-polished.com, Mar. 17, 1/4p.GlobalNews item - Anglo
DM201504-1141
2015
Rough-PolishedParagon seeks to acquire new mine ahead of stage 1 diamond production at Lemphane. rough-polished.com, Mar. 17, 1/4p.Africa, LesothoNews item - Paragon
DM201504-1142
2015
Rough-PolishedGIA verifies Sarine's software products.rough-polished.com, Mar. 17, 1/4p.TechnologyNews item - Sarine
DM201504-1143
2015
Rough-PolishedThere are immense potentialities in India for diamond mining T. M. Baburough-polished.com, Mar. 17, 1/4p.IndiaNews item - mining
DM201504-1144
2015
Rough-PolishedZim diamond firms "agree" to merger.rough-polished.com, Mar. 19, 1/4p.Africa, ZimbabweNews item - legal
DM201504-1145
2015
Rough-PolishedDiamond Corp SA subsidiary inks $ 7 m royalty deal ( Lace with Acrux esources 3% net revenue royalty) on the first 12 m carats.rough-polished.com, Mar. 19, 1/4p.Africa, South AfricaNews item - DiamondCorp
DM201504-1146
2015
Rough-PolishedGem Diamonds revenue up 27% to $ 271 ,mrough-polished.com, Mar. 18, 1/4p.Africa, LesothoNews item - Gem Diamonds
DM201504-1147
2015
Rough-PolishedSarine launches Sarine Profile system for diamond trade.rough-polished.com, Mar. 18, 1/4p.TechnologyNews item - Sarine
DM201504-1148
2015
Rough-PolishedRio Tinto pays Zimbabwe $ 14 mln in taxes.rough-polished.com, Mar. 20, 1/4p.Africa, ZimbabweNews item - Rio Tinto
DM201504-1149
2015
Rough-PolishedDe Beers to upgrade DiamondView.rough-polished.com, Mar. 20, 1/4p.TechnologyNews item - De Beers
DM201504-1150
2015
Rough-PolishedAlrosa increased EBITA by 36% brining it to RUB 93.9 billion in 2014rough-polished.com, Mar. 23, 1/4p.RussiaNews item - Alrosa
DM201504-1151
2015
Rough-PolishedAlfa Bank experts start to analyze Alrosa.rough-polished.com, Mar. 23, 1/4p.RussiaNews item - Alrosa
DM201504-1152
2015
Rough-PolishedCIBJO diamond commission considers threat of questionable grading reports.rough-polished.com, Mar. 23, 1/4p.GlobalNews item - CIBJO
DM201504-1153
2015
Rough-PolishedIia Technologies opens diamond green house in Singapore.rough-polished.com, Mar. 23, 1/4p.SingaporeNews item - synthetics
DM201504-1154
2015
Rough-PolishedAlrosa plans to pay off $ 1 billion of debt this year.rough-polished.com, Mar. 24, 1/4p.RussiaNews item - Alrosa
DM201504-1155
2015
Rough-PolishedLucapa to implement two stage kimberlite exploration program at Lulo.rough-polished.com, Mar. 24, 1/4p.Africa, AngolaNews item - Lucapa
DM201504-1156
2015
Rough-PolishedAntwerp Police Commissioner and diamond squad head arrested on money laundering suspicion.rough-polished.com, Mar. 25, 1/4p.Europe, BelgiumNews item - legal
DM201505-0937
2015
Rough-PolishedDe Beers expects exponential sales growth in Chin a for diamond industry.rough-polished.com, Mar. 27, 1/4p.ChinaNews item - De Beers
DM201505-0938
2015
Rough-PolishedZimbabwe diamond exports continue to decline.rough-polished.com, Mar. 27, 1/4p.Africa, ZimbabweNews item - MMCZ
DM201505-0939
2015
Rough-PolishedIllegal diamond trade continues to flourish in CAR despite KP ban.rough-polished.com, Mar. 27, 1/4p.Africa, Central African RepublicNews item - legal
DM201505-0940
2015
Rough-PolishedAlrosa executive committee discussed Udachny MPD development… Verkhne Munskoye and Zarnitsarough-polished.com, Mar. 26, 1/4p.RussiaNews item - Alrosa
DM201505-0941
2015
Rough-PolishedZim diamond miners 'afraid to say no' to proposed merger.rough-polished.com, Mar. 26, 1/4p.Africa, ZimbabweNews item - legal
DM201505-0942
2015
Rough-PolishedStellar Diamonds advances key projects toward production.rough-polished.com, Mar. 31, 1/4p.Africa, Guinea, Sierra LeoneNews item - Stellar
DM201505-0943
2015
Rough-PolishedAlrosa, Kristall Production Corporation sign new long term contract.rough-polished.com, Mar. 31, 1/4p.RussiaNews item - Alrosa
DM201505-0944
2015
Rough-PolishedWhite Rivers Exploration seeks JV partner to develop SA alluvial asset. rough-polished.com, Mar. 31, 1p.Africa, South AfricaNews item - White Rivers
DM201505-0945
2015
Rough-PolishedAlrosa increased its diamond reserves by 25.6 million carats in 2014, driving its output to 32.2 million carats.rough-polished.com, Apr. 3, 1/4p.RussiaNews item - Alrosa
DM201505-0946
2015
Rough-PolishedModern Russian designers to showcase jewellery at Moscow Estet fashion week.rough-polished.com, Apr. 3, 1/4p.RussiaNews item - jewellery
DM201505-0947
2015
Rough-PolishedMedvedev signed government directive recommending Andrei Zharkov as candidate for Alrosa presidency.rough-polished.com, Apr. 6, 1/4p.RussiaNews item - Alrosa
DM201505-0948
2015
Rough-PolishedRussian government approved of Alrosa winning alluvial deposit auction. Molodo river arearough-polished.com, Apr. 6, 1/4p.Russia, YakutiaNews item - Alrosa
DM201505-0949
2015
Rough-PolishedDe Beers Group turning more sophistocated technology to identify synthetics.rough-polished.com, Apr. 6, 1/2p.TechnologyNews item - IIDGR
DM201505-0950
2015
Rough-PolishedAWDC renews support of DDI to sustain innovation and core functions.rough-polished.com, Apr. 6, 1/4p.GlobalNews item - DDI
DM201505-0951
2015
Rough-PolishedMwana Africa $ 100 mln needed to boost diamond output at DRC mine. Miba JVrough-polished.com, Apr. 14, 1/4p.Africa, Democratic Republic of CongoNews item - Mwana
DM201505-0952
2015
Rough-PolishedTsodilo acquires mobile DMS treatment plant for use at BK16 kimberlite project.rough-polished.com, Apr. 14, 1/4p.Africa, BotswanaNews item - Tsodilo
DM201505-0953
2015
Rough-PolishedIndia's outlook raised by Moody's: Fitch sees faster growth.rough-polished.com, Apr. 14, 1/4p.IndiaNews item - economics
DM201505-0954
2015
Rough-PolishedBotswana Diamonds issues shares in lieu of fees to John Teeling, others.rough-polished.com, Apr. 14, 1/4p.Africa, BotswanaNews item - Botswana Diamonds
DM201505-0955
2015
Rough-PolishedSarine announces FY2014 group performance.rough-polished.com, Apr. 13, 1/4p.TechnologyNews item - Sarine
DM201505-0956
2015
Rough-PolishedDominion Diamond sales up 22%.rough-polished.com, Apr. 10, 1/4p.Canada, Northwest TerritoriesNews item - Dominion
DM201505-0957
2015
Rough-PolishedLucapa says Lulo alluvial mining on track to becoming cash flow positive.rough-polished.com, Apr. 10, 1/4p.Africa, AngolaNews item - Lucapa
DM201505-0958
2015
Rough-PolishedFusion alternatives and Tzoffey's to hold special tenders during international rough diamond week.rough-polished.com, Apr. 10, 1/4p.GlobalNews item - Fusion
DM201505-0959
2015
Rough-PolishedAlrosa will not change the dividend policy - Ryaschin.rough-polished.com, Apr. 9, 1/4p.RussiaNews item - Alrosa
DM201505-0960
2015
Rough-PolishedKarelian Diamonds abandoning exploration in northern Finland. Kuhmo ( anti mining)rough-polished.com, Apr. 9, 1/4p.Europe, FinlandNews item - Karelian Diamonds
DM201505-0961
2015
Rough-PolishedIgor Kevchenkov: money invested in polished diamonds and gold are the most reliable investments.rough-polished.com, Apr. 13, 1p.RussiaNews item - economics
DM201505-0962
2015
Rough-PolishedZim set to commence diamond beneficiation. ZDTCrough-polished.com, Apr. 8, 1/4p.Africa, ZimbabweNews item - ZDTC
DM201505-0963
2015
Rough-PolishedRosatom invented world's best diamond seeking system. Ore processing machine for diamond detection.rough-polished.com, Apr. 15, 1/4p.TechnologyNews item - Ria.ru
DM201505-0964
2015
Rough-PolishedBotswana diamond polishers grapple with high operational costs.rough-polished.com, Apr. 15, 1/4p.Africa, BotswanaNews item - polishers
DM201505-0965
2015
Rough-PolishedAngolan police seize 9000 cts of diamond in Luvo northern Zaire Province.rough-polished.com, Apr. 15, 1/4p.Africa, AngolaNews item - legal
DM201505-0966
2015
Rough-PolishedSA diamond trader steals diamonds worth $ 1 million.rough-polished.com, Apr. 15, 1/4p.Africa, South AfricaNews item - legal
DM201505-0967
2015
Rough-PolishedAlrosa considers 2014 exploration performance.. All targets successfully achieved.rough-polished.com, Apr. 17, 1/4p.RussiaNews item - Alrosa
DM201505-0968
2015
Rough-PolishedDebswana to cease production at Botswana's first diamond mine, pit drying. 1977 Lethalkanerough-polished.com, Apr. 16, 1/4p.Africa, BotswanaNews item - Debswana
DM201505-0969
2015
Rough-PolishedNew record for lab grown diamonds set in Russia. Type Iia using HPHTrough-polished.com, Apr. 20, 1/4p.RussiaNews item - New Diamond Technology
DM201505-0970
2015
Rough-PolishedKristall plans to buy rough diamonds worth RUB 330 million in May.rough-polished.com, Apr. 17, 1/4p.RussiaNews item - Kristall
DM201505-0971
2015
Rough-PolishedMoody's upgrades Alrosa's CFR to Ba2 stable outlook.rough-polished.com, Apr. 22, 1/4p.RussiaNews item - Alrosa
DM201505-0972
2015
Rough-PolishedAlrosa seeks to operate in Dubai due to its proximity to India.rough-polished.com, Apr. 22, 1/4p.RussiaNews item - Alrosa
DM201505-0973
2015
Rough-PolishedRio Tinto - Argyle's production Q1 2015 up 31%.rough-polished.com, Apr. 22, 1/4p.AustraliaNews item - Rio Tinto
DM201505-0974
2015
Rough-PolishedStellar produces 5000 carats from Baoule kimberlite trial mining grade of 13.5 cpht.rough-polished.com, Apr. 22, 1/4p.Africa, GuineaNews item - Stellar
DM201505-0975
2015
Rough-PolishedAndrev Zharkov appointed as President of Alrosa.rough-polished.com, Apr. 23, 1/4p.RussiaNews item - Alrosa
DM201505-0976
2015
Rough-PolishedDe Beers Q1 output up 2%, revises full year guidance downwards.rough-polished.com, Apr. 23, 1/4p.GlobalNews item - De Beers
DM201506-1157
2015
Rough-PolishedAlrosa's net profit under RAS up 2.9 times in Q1.rough-polished.com, Apr. 24, 1/4p.RussiaNews item - Alrosa
DM201506-1158
2015
Rough-PolishedAlrosa's supervisory board proposes dividend payments for 2014.rough-polished.com, Apr. 24, 1/4p.RussiaNews item - Alrosa
DM201506-1159
2015
Rough-PolishedGlobal rough diamond output increased to 131.5 m ct in 2014 - research firm.rough-polished.com, May 22, 1/4p.GlobalNews item - markets
DM201506-1160
2015
Rough-PolishedDMCC Tradeflow launches 'loans for diamonds'.rough-polished.com, May 22, 1/4p.TechnologyNews item - DMCC
DM201506-1161
2015
Rough-PolishedZim diamond centre installs new machinery, cuts 100-700 stones a day.rough-polished.com, Apr. 29, 1/4p.Africa, ZimbabweNews item - cutting
DM201506-1162
2015
Rough-PolishedBotswana not willing to compromise government revenue from rough diamond sales.rough-polished.com, Apr. 29, 1/4p.Africa, BotswanaNews item - economics
DM201506-1163
2015
Rough-PolishedDe Beers may put up $ 1 billion worth of rough for sale at its May sight.rough-polished.com, Apr. 28, 1/4p.GlobalNews item - sight
DM201506-1164
2015
Rough-PolishedAlrosa to consider reduction of operating costs by 2-3% annually.rough-polished.com, May 5, 1/4p.RussiaNews item - Alrosa
DM201506-1165
2015
Rough-PolishedDebmarine Namibia gets $ 195 million for new sampling, exploration vessel.rough-polished.com, May, 5, 1/4p.Africa, NamibiaNews item - Debmarine
DM201506-1166
2015
Rough-PolishedZimbabwe provisionally suspends tax on diamond sales. 15%rough-polished.com, May 5, 1/4p.Africa, ZimbabweNews item - legal
DM201506-1167
2015
Rough-PolishedDiamcor pockets $ 5 mliion in revenue from SA project since 2013. Krone-Endorarough-polished.com, May 5, 1/4p.Africa, South AfricaNews item - Diamcor
DM201506-1168
2015
Rough-PolishedNorth Arrow reports final recovery of 384 carats from Qilalugaq bulk sample.rough-polished.com, May 8, 1/4p.Canada, Northwest TerritoriesNews item - North Arrow
DM201506-1169
2015
Rough-PolishedDe Beers cuts diamond prices at latest sale - report. 3%rough-polished.com, May 7, 1/4p.GlobalNews item - De Beers
DM201506-1170
2015
Rough-PolishedProposed Zim diamond merger "costly" - report.rough-polished.com, May 7, 1/4p.Africa, ZimbabweNews item - legal
DM201506-1171
2015
Rough-PolishedAlrosa recovered large diamond weighing 76.07 carats at Concentrating factory No. 14, Aikal.rough-polished.com, May 6, 1/4p.RussiaNews item - Alrosa
DM201506-1172
2015
Rough-PolishedDiamond Corp to start mining at Lace in second half of the year.rough-polished.com, May 6, 1/4p.Africa, South AfricaNews item - DiamondCorp
DM201506-1173
2015
Rough-PolishedFusion/Hennig to sell 30 carat ' Kimberley Purple' from Superkolong tailings plant.rough-polished.com, May 6, 1/4p.Africa, South AfricaNews item - Batia
DM201506-1174
2015
Rough-PolishedShore Gold commences large diamond drilling at Orion South.rough-polished.com, May 15, 1/4p.Canada, SaskatchewanNews item - Shore Gold
DM201506-1175
2015
Rough-PolishedIndian diamond industry to adopt more secure business systems. rough-polished.com, May 14, 1/4p.IndiaNews item - legal
DM201506-1176
2015
Rough-PolishedDe Beers acquires stake in Synova. Laser micro jet technology.rough-polished.com, May 14, 1/4p.TechnologyNews item - Synova
DM201506-1177
2015
Rough-PolishedMbada Diamonds fires 240 workers following strike.rough-polished.com, May 14, 1/4p.Africa, ZimbabweNews item - Mbada
DM201506-1178
2015
Rough-PolishedMarange Resources hit by $ 178 k lawsuit ( transport company)rough-polished.com, May 13, 1/4p.Africa, ZimbabweNews item - Marange
DM201506-1179
2015
Rough-PolishedAntwerp stregthens ties with Canadian miners. Renardrough-polished.com, May 13, 1/4p.Canada, QuebecNews item - Stornoway
DM201506-1180
2015
Rough-PolishedAlrosa gets Eyekitsky 31 million carat licence.rough-polished.com, May 15, 1/4p.Russia, YakutiaNews item - Alrosa
DM201506-1181
2015
Rough-PolishedWFDB to discuss diamond overgrading at Presidents meeting next month.rough-polished.com, May 19, 1/4p.TechnologyNews item - WFDB
DM201506-1182
2015
Rough-PolishedSA State diamond trader under fire.rough-polished.com, May 19, 1/4p.Africa, South AfricaNews item - SDT
DM201506-1183
2015
Rough-PolishedPetra Diamonds, SA workers union reach entrenchment deal.rough-polished.com, May 19, 1/4p.Africa, South AfricaNews item - Petra
DM201506-1184
2015
Rough-PolishedZimbabwe conducts third local diamond auction.rough-polished.com, May 18, 1/4p.Africa, ZimbabweNews item - auction
DM201506-1185
2015
Rough-PolishedIDE outlines actions following GIA alert on treated diamonds.rough-polished.com, May 20, 1/4p.TechnologyNews item - IDE
DM201506-1186
2015
Rough-PolishedSri Lanka to enter Botswana diamond market.rough-polished.com, May 20, 1/4p.Africa, BotswanaNews item - markets
DM201506-1187
2015
Rough-PolishedZim now "experienced" in diamond trading.rough-polished.com, May 21, 1/4p.Africa, ZimbabweNews item - sales
DM201506-1188
2015
Rough-PolishedLucapa rakes in $ 2.3 million from Lulo's fourth diamond sale.rough-polished.com, May 22, 1/4p.Africa, AngolaNews item - Lucapa
DM201506-1189
2015
Rough-PolishedDiacam360 to debut at upcoming JCK Las Vegas show. High quality photos and 360 degree videos.rough-polished.com, May 22, 1/4p.TechnologyNews item - Diacam360
DM201506-1190
2015
Rough-PolishedAnalysts: Alrosa may reduce diamond prices by 2-3% in May.rough-polished.com, May 21, 1/4p.RussiaNews item - Alrosa
DM201506-1191
2015
Rough-PolishedDominion Diamond's 1 Q rough diamond sales up 7 %.rough-polished.com, May 26, 1/4p.Canada, Northwest TerritoriesNews item - Domion
DM201506-1192
2015
Rough-PolishedLukfook Group signs three year sightholder sales contract with De Beers.rough-polished.com, May 26, 1/4p.ChinaNews item - De Beers
DM201506-1193
2015
Rough-PolishedAlrosa unearths large diamond weighing 78 carats. Mirrough-polished.com, May 25, 1/4p.RussiaNews item - Alrosa
DM201506-1194
2015
Rough-PolishedGem Diamonds declares maiden dividend. Letseng, Ghaghoorough-polished.com, May 25, 1/4p.Africa, Lesotho, BotswanaNews item - GEM Diamonds
DM201506-1195
2015
Rough-PolishedTrans Hex reports higher earnings.rough-polished.com, May 27, 1/4p.Africa, Angola, South AfricaNews item - Trans Hex
DM201507-1196
2015
Rough-PolishedHead of Yakutia and Alrosa president held a joint meeting.rough-polished.com, May 28, 1/4p.RussiaNews item - Alrosa
DM201507-1197
2015
Rough-PolishedDiamond Corp loss widens, mining starts at Lace mine.rough-polished.com, May 28, 1/4p.Africa, South AfricaNews item - DiamondCorp
DM201507-1198
2015
Rough-PolishedLucara readies for first exceptional stone tender in Botswana.rough-polished.com, May 28, 1/4p.Africa, BotswanaNews item - Lucara
DM201507-1199
2015
Rough-PolishedNew Namibia, De Beers sales agreement to come into force next month.rough-polished.com, May 28, 1/4p.Africa, NamibiaNews item - De Beers
DM201507-1200
2015
Rough-PolishedChanges are shaping the world's diamond market.rough-polished.com, May 28, 1/4p.GlobalNews item - markets
DM201507-1201
2015
Rough-PolishedWhat it will take for the synthetic diamond industry to be ( un) successful.rough-polished.com, May 27, 1/4p.TechnologyNews item - synthetics
DM201507-1202
2015
Rough-PolishedVIP diamond buyers resist De Beers pricing that boosted profits.rough-polished.com, May 26, 1/4p.GlobalNews item - De Beers
DM201507-1203
2015
Rough-PolishedPeregrine Diamonds Ltd. Joined the Diamond Bourse of Canada and is being represented by Dr. Jennifer Pell.rough-polished.com, May 27, 1/4p.CanadaNews item - Peregrine
DM201507-1204
2015
Rough-PolishedJPMorgan reduces Alrosa shares rating to 'hold', raises forecast cost by 66%.rough-polished.com, May 29, 1/4p.RussiaNews item - Alrosa
DM201507-1205
2015
Rough-PolishedSight okay, retail not at all.rough-polished.com, May 29, 1p.GlobalNews item - prices
DM201507-1206
2015
Rough-PolishedIndia's SNZ for rough trading to become operation from 1st July.rough-polished.com, June 2, 1/4p.IndiaNews item - SNZ
DM201507-1207
2015
Rough-PolishedBrazil Minerals completes first phase of new diamond & gold area geological assessment.rough-polished.com, June 2, 1/4p.South America, BrazilNews item - Brazil Minerals
DM201507-1208
2015
Rough-PolishedS & P confirmed Alrosa's rating, improved the outlook to positive.rough-polished.com, June 1, 1/4p.RussiaNews item - Alrosa
DM201507-1209
2015
Rough-PolishedAbbey Chikane's prescription on diamond beneficiation in southern Africa.rough-polished.com, June 1, 1p.AfricaNews item - KP
DM201507-1210
2015
Rough-PolishedAlrosa to repay $ 1 Bln of debt in autumn ahead of schedule.rough-polished.com, June 4, 1/4p.RussiaNews item - Alrosa
DM201507-1211
2015
Rough-PolishedDe Beers 2014 rough diamond sales for beneficiation in host countries up 11%.rough-polished.com, June 4, 1/4p.GlobalNews item - De Beers
DM201507-1212
2015
Rough-PolishedYakutia lowers target figures for gold mining, diamond manufacturing.rough-polished.com, June 4, 1/4p.RussiaNews item - Yakutia
DM201507-1213
2015
Rough-PolishedScio Diamond teams with Helzberg to test demand for lab-grown diamonds.rough-polished.com, June 4, 1/4p.TechnologyNews item - Scio Diamond
DM201507-1214
2015
Rough-PolishedBotswana Resource sector conference roars into life.rough-polished.com, June 9, 1/4p.Africa, BotswanaNews item - economics
DM201507-1215
2015
Rough-PolishedDTZ-OZGEO ordered to suspend diamond mining.rough-polished.com, June 8, 1/4p.Africa, ZimbabweNews item - DTZ-OZGEO
DM201507-1216
2015
Rough-PolishedBotswana Diamonds says new Diamondiferous kimberlite expected by year-end. ( Orapa region)rough-polished.com, June 11, 1/4p.Africa, BotswanaNews item - Botswana Diamonds
DM201507-1217
2015
Rough-PolishedRough, polished diamond prices mismatch driving demand downwards - Botswana minister.rough-polished.com, June 11, 1/4p.Africa, BotswanaNews item - prices
DM201507-1218
2015
Rough-PolishedDebswana says not worried about synthetic diamonds.rough-polished.com, June 11, 1/4p.Africa, BotswanaNews item - Debswana
DM201507-1219
2015
Rough-PolishedDTZ-OZGEO never stopped diamond mining operations in Zimbabwe.rough-polished.com, June 10, 1/4p.Africa, ZimbabweNews item - DTZ-OZGEO
DM201507-1220
2015
Rough-PolishedSA senior diamond valuator fired for probing De Beers - report.rough-polished.com, June 10, 1/4p.Africa, South AfricaNews item - De Beers
DM201507-1221
2015
Rough-PolishedAlrosa president to attend 2015 president's meeting … World Federation of Diamond Bourses.rough-polished.com, June 9, 1/4p.RussiaNews item - Alrosa
DM201507-1222
2015
Rough-PolishedMustang Resources recovers diamonds in Mozambique. Save Riverrough-polished.com, June 18, 1/4p.Africa, MozambiqueNews item - Mustang
DM201507-1223
2015
Rough-PolishedBotswana invites bids for new Orapa diamond licences.rough-polished.com, June 18, 1/4p.Africa, BotswanaNews item - legal
DM201507-1224
2015
Rough-PolishedPetra expects FY revenue to top $ 430 m.rough-polished.com, June 17, 1/4p.Africa, South AfricaNews item - Petra
DM201507-1225
2015
Rough-PolishedMuseum of Named Diamonds opens to focus on 'Diamond Story'. [email protected]rough-polished.com, June 17, 1/4p.GlobalNews item - diamonds notable
DM201507-1226
2015
Rough-PolishedBotswana Diamonds, Alrosa JV identify 'strong' anomaly on Orapa prospecting licence.rough-polished.com, June 19, 1/4p.Africa, BotswanaNews item - Botswana Diamonds, Alrosa
DM201507-1227
2015
Rough-PolishedDe Beers rakes in $ 550 m from June sight.rough-polished.com, June 19, 1/4p.GlobalNews item - De Beers
DM201507-1228
2015
Rough-PolishedLocal community stopped Alrosa's alluvial diamond mining at Malaya Kuonapka.rough-polished.com, June 18, 1/4p.Russia, YakutiaNews item - Alrosa
DM201507-1229
2015
Rough-PolishedAlrosa announces a RUB bn bond repayment.rough-polished.com, June 24, 1/4p.RussiaNews item - Alrosa
DM201507-1230
2015
Rough-PolishedGraff unveils 132 carat Golden Empress yellow diamond. From Letsengrough-polished.com, June 24, 1/4p.Africa, LesothoNews item - diamonds notable
DM201507-1231
2015
Rough-PolishedDDRC finds no synthetic diamond on screening.rough-polished.com, June 24, 1/4p.IndiaNews item - DDRC
DM201507-1232
2015
Rough-PolishedNew head of Alrosa says no need to change the company's strategy.rough-polished.com, June 23, 1/4p.RussiaNews item - Alrosa
DM201507-1233
2015
Rough-PolishedTsodilo subsidiary Bosoto takes possession of diamonds recovered from BK16.rough-polished.com, June 23, 1/4p.Africa, BotswanaNews item - Tsodilo
DM201507-1234
2015
Rough-PolishedTrying to fix supply driven diamond pipeline instead of generating demand.rough-polished.com, June 24, 1/4p.GlobalNews item - pipeline
DM201507-1235
2015
Rough-PolishedIt's time to regulate - and rename - lab grown diamonds.rough-polished.com, June 23, 1/4p.TechnologyNews item - synthetics
DM201507-1236
2015
Rough-PolishedAlrosa held annual general meeting of shareholders in Mirny.rough-polished.com, June 25, 1/4p.RussiaNews item - Alrosa
DM201507-1237
2015
Rough-PolishedAlrosa to increase revenue by 30% in 2015 through exports.rough-polished.com, June 25, 1/4p.RussiaNews item - Alrosa
DM201507-1238
2015
Rough-PolishedDe Beers yields to Namibia's demands - report.rough-polished.com, June 25, 1/4p.Africa, NamibiaNews item - De Beers
DM201507-1239
2015
Rough-PolishedKennady announces Kelvin sample grade of 2.74 carats per tonne.rough-polished.com, June 25, 1/4p.Canada, Northwest TerritoriesNews item - Kennady
DM201507-1240
2015
Rough-PolishedZim not relenting on diamond merger.rough-polished.com, June 25, 1/4p.Africa, ZimbabweNews item - legal
DM201508-1241
2015
Rough-PolishedNew proposals for Alrosa's strategy may follow - Galushka.rough-polished.com, June 29, 1/4p.RussiaNews item - Alrosa
DM201508-1242
2015
Rough-PolishedKP leaders stress consensus and bringing CAR, Venezuela back into compliance.rough-polished.com, June 29, 1/4p.Africa, Central African Republic, South America, VenezuelaNews item - KP
DM201508-1243
2015
Rough-PolishedParagon Diamonds loss widens.rough-polished.com, June 29, 1/4p.Africa, LesothoNews item - Paragon
DM201508-1244
2015
Rough-PolishedOver the long term, we can expect to see supply shortfall and rising prices.rough-polished.com, June 29, 1p.GlobalNews item - prices
DM201508-1245
2015
Rough-PolishedArgyle pink diamonds tender world preview at Sydney Opera House.rough-polished.com, June 29, 1/4p.AustraliaNews item - Argyle
DM201508-1246
2015
Rough-PolishedWorld's first electronic diamond exchange of Singapore to become operational in September.rough-polished.com, July 3, 1/4p.Asia, SingaporeNews item - DIE
DM201508-1247
2015
Rough-PolishedEllendale diamond mines goes into unexpected voluntary administration.rough-polished.com, July 3, 1/4p.AustraliaNews item - Ellendale
DM201508-1248
2015
Rough-PolishedNamibia establishing new sales and marketing company.rough-polished.com, July 3, 1/4p.Africa, NamibiaNews item - legal
DM201508-1249
2015
Rough-PolishedCAR to resume rough exports following KPCS's planrough-polished.com, July 2, 1/4p.Africa, Central African RepublicNews item - KP
DM201508-1250
2015
Rough-PolishedAlrosa president visits Angola.rough-polished.com, July 2, 1/4p.Africa, AngolaNews item - Alrosa
DM201508-1251
2015
Rough-PolishedRockwell Diamonds says Q1 was very challenging.rough-polished.com, July 2, 1/4p.Africa, South AfricaNews item - Rockwell
DM201508-1252
2015
Rough-PolishedKimberley Diamonds secures over $ 7 m to re-commision Botswana mine. Leralarough-polished.com, July 1, 1/4p.Africa, BotswanaNews item - Kimberley
DM201508-1253
2015
Rough-PolishedLucapa, partners seek to double diamond operations in Angola.rough-polished.com, July 1, 1/4p.Africa, AngolaNews item - Lucapa
DM201508-1254
2015
Rough-PolishedAustralia to withdraw candidacy for KP vice chair.rough-polished.com, July 2, 1/4p.AustraliaNews item - KP
DM201508-1255
2015
Rough-PolishedPangolin identifies anomalous kimberlite indicator minerals at Botswana project, Malatswaerough-polished.com, July 2, 1/4p.Africa, BotswanaNews item - Pangolin
DM201508-1256
2015
Rough-PolishedMonsoon floods damage diamond polishing units in Gujarat.rough-polished.com, July 2, 1/4p.IndiaNews item - Gujarat
DM201508-1257
2015
Rough-PolishedRenaissance Capital downgrades Alrosa's shares to sell and estimates them at $ 1.04.rough-polished.com, July 1, 1/4p.RussiaNews item - Alrosa
DM201508-1258
2015
Rough-PolishedAlrosa to up investment in Angola.rough-polished.com, July 3, 1/4p.Africa, AngolaNews item - Alrosa
DM201508-1259
2015
Rough-PolishedEllendale diamond mines goes into unexpected voluntary administration.rough-polished.com, July 3, 1/4p.AustraliaNews item - Ellendale
DM201508-1260
2015
Rough-PolishedThe three tipping points of Man-made diamonds.rough-polished.com, July 8, 1/4p.TechnologyNews item - synthetics
DM201508-1261
2015
Rough-PolishedMountain Province's Gahcho Kue diamond mine 62 percent complete.rough-polished.com, July 8, 1/4p.Canada, Northwest TerritoriesNews item - Mountain Province
DM201508-1262
2015
Rough-PolishedSA workers union against De Beers' planned sale of Kimberley Mines.rough-polished.com, July 8, 1/4p.Africa, South AfricaNews item - legal
DM201508-1263
2015
Rough-PolishedGems One rolls out the new 101 facet diamond cut.rough-polished.com, July 8, 1/4p.TechnologyNews item - Epic 101
DM201508-1264
2015
Rough-PolishedCommentary by John Teeling 'I would like to hold on to something commercial'.rough-polished.com, July 6, 1p.Africa, BotswanaNews item - Botswana Diamonds
DM201508-1265
2015
Rough-PolishedIndian diamond industry decides on 'no embargo on rough import'; suggests 'self-discipline'.rough-polished.com, July 8, 1/4p.IndiaNews item - BDB, MDMA
DM201508-1266
2015
Rough-PolishedYakutia produced 10.8% more diamonds in H1.rough-polished.com, July 10, 1/4p.Russia, YakutiaNews item - Alrosa
DM201508-1267
2015
Rough-PolishedRBZ subsidiary eyes $ 1 million for equipment to beneficiate diamonds.rough-polished.com, July 10, 1/4p.Africa, ZimbabweNews item - Reserve Bank
DM201508-1268
2015
Rough-PolishedBritish Embassy says Zim diamond industry 'politically sensitive'.rough-polished.com, July 10, 1/4p.Africa, ZimbabweNews item - legal
DM201508-1269
2015
Rough-PolishedGolden Saint Resources recovers 100 carats from bulk sampling in Sierra Leone.rough-polished.com, July 10, 1/4p.Africa, Sierra LeoneNews item - Golden Saint
DM201508-1270
2015
Rough-PolishedBelgian police are investigating illegal supply of diamonds from Africa.rough-polished.com, July 14, 1/4p.Europe, BelgiumNews item - legal
DM201508-1271
2015
Rough-PolishedParagon signs legally binding agreement to acquire Mothae.rough-polished.com, July 15, 1/4p.Africa, LesothoNews item - Paragon
DM201508-1272
2015
Rough-PolishedLucara's exceptional stone tender. Karowe rakes in $ 69 Million.rough-polished.com, July 20, 1/4p.Africa, BotswanaNews item - Lucara
DM201508-1273
2015
Rough-PolishedRiozim assures workers, community of its commitment to Murowa diamonds.rough-polished.com, July 20, 1/4p.Africa, ZimbabweNews item - RioZim
DM201508-1274
2015
Rough-PolishedTsodilo adopts new exploration geological model.rough-polished.com, July 17, 1/4p.Africa, BotswanaNews item - Tsodilo
DM201508-1275
2015
Rough-PolishedKennady announces Faraday 2 diamond recovery results.rough-polished.com, July 17, 1/4p.Canada, Northwest TerritoriesNews item - Kennady
DM201508-1276
2015
Rough-PolishedAlrosa reports H1 production and trading performance.rough-polished.com, July 21, 1/4p.RussiaNews item - Alrosa
DM201508-1277
2015
Rough-PolishedZim's Murowa Diamonds output dips in H1. ( 50% drop in the first half of year).rough-polished.com, July 21, 1/4p.Africa, ZimbabweNews item - Rio Tinto
DM201508-1278
2015
Rough-PolishedPangolin finds abundant "positive" kimberlitic ilmentes at Malatswae.rough-polished.com, July 21, 1/4p.Africa, BotswanaNews item - Pangolin
DM201508-1279
2015
Rough-PolishedPeregrine acquires Botswana diamond company. Diamexstratrough-polished.com, July 21, 1/4p.Africa, BotswanaNews item - Peregrine
DM201508-1280
2015
Rough-PolishedRio's Argyle diamond production up; Diavik flat.rough-polished.com, July 20, 1/4p.Australia, Canada, Northwest TerritoriesNews item - Rio Tinto
DM201508-1281
2015
Rough-PolishedDe Beers July sight realizes $ 200m as buyers reject goods.rough-polished.com, July 22, 1/4p.GlobalNews item - De Beers
DM201508-1282
2015
Rough-PolishedDiamcor rakes in over $ 450K from SA Q1 diamond sales.rough-polished.com, July 22, 1/4p.Africa, South AfricaNews item - Diamcor
DM201508-1283
2015
Rough-PolishedKimberley okays Lerala mining restart.rough-polished.com, July 22, 1/4p.Africa, BotswanaNews item - Kimberley Diamonds
DM201508-1284
2015
Rough-PolishedDTZ-OZGEO is steadily increasing production and exploration.rough-polished.com, July 22, 1/4p.Africa, ZimbabweNews item - DTZ-OZGEO
DM201508-1285
2015
Rough-PolishedTawana says BlueRock still interested in diamond resource. Kareevleirough-polished.com, July 23, 1/4p.Africa, South AfricaNews item - Tawana
DM201508-1286
2015
Rough-PolishedAlrosa increased net profit under RAS by 1.6 times. rough-polished.com, July 23, 1/4p.RussiaNews item - Alrosa
DM201508-1287
2015
Rough-PolishedAlfa-bank has lowered the estimate of Alosa's shares to 100 rubles. Maintain buy recommendation.rough-polished.com, July 23, 1/4p.RussiaNews item - Alrosa
DM201508-1288
2015
Rough-PolishedDe Beers reviews 2015 production guidance, H1 sales weaken.rough-polished.com, July 24, 1/4p.GlobalNews item - De Beers
DM201508-1289
2015
Rough-PolishedIDE holds symposium to discuss main issues facing the diamond industry.rough-polished.com, July 24, 1/4p.GlobalNews item - IDE
DM201508-1290
2015
Rough-PolishedMarange villagers accuse Zim environment agency of inaction as diamond miners destroy environment.rough-polished.com, July 24, 1/4p.Africa, ZimbabweNews item - CSR
DM201508-1291
2015
Rough-PolishedAlrosa completes open-pit mining at Udachnaya pipe.rough-polished.com, July 27, 1/4p.Russia, YakutiaNews item - Alrosa
DM201508-1292
2015
Rough-PolishedShortening the supply pipeline is a unique feature of the International Diamond Week in Israel.rough-polished.com, July 27, 1/4p.GlobalNews item - pipeline
DM201509-1293
2015
Rough-PolishedAlrosa announces a $ 85 mln bank loan repayment.rough-polished.com, July 29, 1/4p.RussiaNews item - Alrosa
DM201509-1294
2015
Rough-PolishedDe Beers says buyers can defer up to 75% of allocated rough at August sight.rough-polished.com, July 29, 1/4p.GlobalNews item - De Beers
DM201509-1295
2015
Rough-PolishedDiamond Corp frustrated by kimberlite development at Lace.rough-polished.com, Aug. 4, 1/4p.Africa, South AfricaNews item - DiamondCorp
DM201509-1296
2015
Rough-PolishedMwana Africa restarts SA underground mining . Klipspringerrough-polished.com, Aug. 4, 1/4p.Africa, South AfricaNews item - Mwana
DM201509-1297
2015
Rough-PolishedKP to brief UN on decision to allow CAR resume diamond exports in compliant zones.rough-polished.com, Aug. 3, 1/4p.Africa, Central African RepublicNews item - KP
DM201509-1298
2015
Rough-PolishedPetra boosts diamond output. Wiliamsonrough-polished.com, July 31, 1/4p.Africa, TanzaniaNews item - Petra
DM201509-1299
2015
Rough-PolishedBritish MP: the Kohinoor diamond should be returned to India.rough-polished.com, July 31, 1/4p.IndiaNews item - diamonds notable
DM201509-1300
2015
Rough-PolishedGye Nyame creditors seek to restart defunct mine despite Zim diamond mines consolidation plans. Marangerough-polished.com, Aug. 4, 1/4p.Africa, ZimbabweNews item - Gye Nyame
DM201509-1301
2015
Rough-PolishedAngola's H1 diamond sales up 35% to $ 573m.rough-polished.com, Aug. 5, 1/4p.Africa, AngolaNews item - Endiama
DM201509-1302
2015
Rough-PolishedBlue Star to offer 200 lots in polished diamond tender.rough-polished.com, Aug. 5, 1/4p.GlobalNews item - Blue Star
DM201509-1303
2015
Rough-PolishedGIA bars Indian company for fraudulent report inscription.rough-polished.com, Aug. 5, 1/4p.IndiaNews item - Cristy Gems
DM201509-1304
2015
Rough-PolishedDiamond prices, sentiment slump in July.rough-polished.com, Aug. 6, 1/4p.GlobalNews item - prices
DM201509-1305
2015
Rough-PolishedSeveralmaz reduces loss under RAS 2,4 times.rough-polished.com, Aug. 11, 1/4p.RussiaNews item - Alrosa
DM201509-1306
2015
Rough-PolishedAngola imposes moratorium on issuing mining licences.rough-polished.com, Aug. 11, 1/4p.Africa, AngolaNews item - legal
DM201509-1307
2015
Rough-PolishedAngola extends Lulo diamond mining concession.rough-polished.com, Aug. 11, 1/4p.Africa, AngolaNews item - Lucapa
DM201509-1308
2015
Rough-PolishedSarine's revenue declines significantly in Q2 2015 year on year on the back of challenging industry conditions.rough-polished.com, Aug. 11, 1/4p.TechnologyNews item - Sarine
DM201509-1309
2015
Rough-PolishedGemfields eyes 30% market share in India.rough-polished.com, Aug. 10, 1/4p.IndiaNews item - Gemfields
DM201509-1310
2015
Rough-PolishedTelangana sitting on a bed of diamonds.rough-polished.com, Aug. 12, 1/4p.IndiaNews item - Mahbubnagar
DM201509-1311
2015
Rough-PolishedZim establishes diamond cleaning facility.rough-polished.com, Aug. 12, 1/4p.Africa, ZimbabweNews item - laboratory
DM201509-1312
2015
Rough-PolishedOur business is built on trust and confidence is critical.rough-polished.com, Aug. 10, 1/4p.GlobalNews item - legal
DM201509-1313
2015
Rough-PolishedNamibia aiming for Botswana style diamond deal with De Beers.rough-polished.com, Aug. 9, 1/4p.Africa, NamibiaNews item - Debswana
DM201509-1314
2015
Rough-PolishedThe new diamond capital… India.rough-polished.com, Aug. 11, 1/4p.IndiaNews item - Polishing
DM201509-1315
2015
Rough-PolishedLucara Q2 revenue up to $ 38m, completes Botswana plant optimisation project. Karowerough-polished.com, Aug. 13, 1/4p.Africa, BotswanaNews item - Lucara
DM201509-1316
2015
Rough-PolishedMorgan Stanley kept the recommendation to buy Alrosa's shares.rough-polished.com, Aug. 12, 1/4p.RussiaNews item - Alrosa
DM201509-1317
2015
Rough-PolishedSierra Leone alluvial diamond deposits exhausted.rough-polished.com, Aug. 14, 1/4p.Africa, Sierra LeoneNews item - alluvials
DM201509-1318
2015
Rough-PolishedDe Beers granted new licences in Botswana, SA.rough-polished.com, Aug. 17, 1/4p.Africa, BotswanaNews item - De Beers
DM201509-1319
2015
Rough-PolishedPangolin optomistic of finding diamonds in Botswana. Profile by Leon Daniels on Malatswae project.rough-polished.com, Aug. 17, 1p.Africa, BotswanaNews item - Pangolin.
DM201509-1320
2015
Rough-PolishedBotswana seen facing budget deficit as diamond sales fall.rough-polished.com, Aug. 18, 1/4p.Africa, BotswanaNews item - legal
DM201509-1321
2015
Rough-PolishedIn Antwerp there are only 500 diamond cutters left.rough-polished.com, Aug. 18, 1/4p.Europe, BelgiumNews item - cutters
DM201509-1322
2015
Rough-PolishedCarnage in diamond cutting industry.rough-polished.com, Aug. 18, 1/4p.GlobalNews item - cutters
DM201509-1323
2015
Rough-PolishedAnglo switch an emblem of industry in reverse.rough-polished.com, Aug. 17, 1/4p.GlobalNews item - Anglo
DM201509-1324
2015
Rough-PolishedIndia's diamond market events in July 2015.rough-polished.com, Aug. 17, 1p.IndiaNews item - markets
DM201509-1325
2015
Rough-PolishedGSI in Surat begins to bulk batch testing of Stars and Melees.rough-polished.com, Aug. 20, 1/4p.IndiaNews item - GSI
DM201509-1326
2015
Rough-PolishedZimbabwe projects drop in mining production as reserves decline.rough-polished.com, Aug. 20, 1/4p.Africa, ZimbabweNews item - Marange
DM201509-1327
2015
Rough-PolishedStornoway will begin full-scale production at the Renard mine in mid 2017.rough-polished.com, Aug. 19, 1/4p.Canada, QuebecNews item - Stornoway
DM201509-1328
2015
Rough-PolishedStellar raises $ 300 k for group working capital. Baouerough-polished.com, Aug. 19, 1/4p.Africa, GuineaNews item - Stellar
DM201509-1329
2015
Rough-PolishedDiamond firm slapped with UN sanctions for CAR illegal trading. Kardiam ( Badica).rough-polished.com, Aug. 24, 1/4p.Africa, Central African RepublicNews item - Kardiam
DM201509-1330
2015
Rough-PolishedSoft diamond prices force Botswana to cut growth to 2.5%.rough-polished.com, Aug. 24, 1/4p.Africa, BotswanaNews item - prices
DM201509-1331
2015
Rough-PolishedDe Beers program distributes books to communities near Snap Lake and Victor.rough-polished.com, Aug. 24, 1/4p.Canada, Northwest Territories, OntarioNews item - CSR
DM201509-1332
2015
Rough-PolishedAlrosa reduced diamond sale in August, but did not amend prices.rough-polished.com, Aug. 27, 1/4p.RussiaNews item - Alrosa
DM201509-1333
2015
Rough-PolishedKimberley remains on track for Lerala production start next Feb.rough-polished.com, Aug. 27, 1/4p.Africa, BotswanaNews item - Kimberley Diamonds
DM201509-1334
2015
Rough-PolishedDiamond sales at Mwana's SA mine drop. Klipspringerrough-polished.com, Aug. 27, 1/4p.Africa, South AfricaNews item - Mwana
DM201510-2062
2015
Rough-PolishedDe Beers cautiously optimistic for outlook in major consumer markets.rough-polished.com, Aug. 31, 2p.GlobalNews item - De Beers
DM201510-2063
2015
Rough-PolishedAlrosa plans to adjust sales plan for H2.rough-polished.com, Sept. 3, 1/4p.RussiaNews item - Alrosa
DM201510-2064
2015
Rough-PolishedDiamond Corp pencils first Lace diamonds sale for Oct.rough-polished.com, Sept. 3, 1/4p.Africa, South AfricaNews item - DiamondCorp
DM201510-2065
2015
Rough-PolishedSmuggling of CAR diamonds into Cameroon, Chad fueling conflict.rough-polished.com, Sept. 3, 1/4p.Africa, Central African RepublicNews item - CSR
DM201510-2066
2015
Rough-PolishedNewly discovered Kamchatka diamond field may contain up to 10 million carats of diamonds. Ozernovo rough-polished.com, Sept. 3, 1/4p.RussiaNews item - Ozernovo
DM201510-2067
2015
Rough-PolishedAntwerp remains most important rough diamond trade hub.rough-polished.com, Sept. 2, 1/4p.Europe, BelgiumNews item - Antwerp
DM201510-2068
2015
Rough-PolishedAlrosa is waiting for diamond trade zone in India to form.rough-polished.com, Sept. 4, 1/4p.Russia, IndiaNews item - Alrosa
DM201510-2069
2015
Rough-PolishedAlrosa offers Chinese partners to participate in diamond cutting in Vladivorstok.rough-polished.com, Sept. 4, 1/4p.Russia, ChinaNews item - Alrosa
DM201510-2070
2015
Rough-PolishedAlrosa will not change the overall strategy due to easing of diamond prices.rough-polished.com, Sept. 4, 1/4p.RussiaNews item - Alrosa
DM201510-2071
2015
Rough-PolishedBotswana Diamonds, Alrosa to start drilling, intensive soil sampling in Orapa.rough-polished.com, Sept. 4, 1/4p.Africa, BotswanaNews item - Botswana Diamonds, Alrosa
DM201510-2072
2015
Rough-PolishedEpstein: the potential of the diamond exchange in the Russian Far East is limited.rough-polished.com, Sept. 4, 1/4p.RussiaNews item - AWDC
DM201510-2073
2015
Rough-PolishedDiamond bourse may be created in the Far East in 2016rough-polished.com, Sept. 3, 1/4p.RussiaNews item - bourse
DM201510-2074
2015
Rough-PolishedAlrosa raised $ 1.13 million during diamond week in Yakutia.rough-polished.com, Sept. 8, 1/4p.RussiaNews item - Alrosa
DM201510-2075
2015
Rough-PolishedAlrosa to sell no more than $ 295m worth of diamonds in Yakutia in 2015.rough-polished.com, Sept. 8, 1/4p.RussiaNews item - Alrosa
DM201510-2076
2015
Rough-PolishedAngola produces over 865 K ct in July, pockets $ 115m.rough-polished.com, Sept. 7, 1/4p.Africa, AngolaNews item -
DM201510-2077
2015
Rough-PolishedPortugal to become 7th KP authority in Europe.rough-polished.com, Sept. 7, 1/4p.Europe, PortugalNews item - KP
DM201510-2078
2015
Rough-PolishedAlrosa seeks government support for diamond mining at Verkne-Munskoye deposit. rough-polished.com, Sept. 9, 1/4p.Russia, YakutiaNews item - Alrosa
DM201510-2079
2015
Rough-PolishedAngola's Endiama licences two diamond exploration co-operatives, Nharea Ble province.rough-polished.com, Sept. 9, 1/4p.Africa, AngolaNews item - Endiama
DM201510-2080
2015
Rough-PolishedCatoca's 2014 diamond sales marginally up as output drops.rough-polished.com, Sept. 10, 1/4p.Africa, AngolaNews item - Catoca
DM201510-2081
2015
Rough-PolishedDharmanand an Research Centre introduces D-Secure for synthetics identification.rough-polished.com, Sept. 10, 1/4p.TechnologyNews item - Synthetics
DM201510-2082
2015
Rough-PolishedMwana raises funds to recommence production at mothballed SA diamond mine.rough-polished.com, Sept. 11, 1/4p.Africa, South AfricaNews item - Mwana
DM201510-2083
2015
Rough-PolishedGemfields pockets over $ 34 million from Kagem emeralds auction ( Zambia)rough-polished.com, Sept. 11, 1/4p.Africa, ZambiaNews item - Gemfields
DM201510-2084
2015
Rough-PolishedScio raises $ 1.6 million to fund synthetic diamond development.rough-polished.com, Sept. 11, 1/4p.TechnologyNews item - Scio
DM201510-2085
2015
Rough-PolishedBotswana Diamonds, Alrosa start drilling on 3 Orapa prospecting licences.rough-polished.com, Sept. 14, 1/4p.Africa, BotswanaNews item - Botswana Diamonds, Alrosa
DM201510-2086
2015
Rough-PolishedDebswana lowers 2015 diamond output guidance.rough-polished.com, Sept. 14, 1/4p.RussiaNews item - Alrosa
DM201510-2087
2015
Rough-PolishedRio Tinto to hold special tender for +10.8 carat stones at IDE ( coloured rough too)rough-polished.com, Sept. 14, 1/4p.AustraliaNews item - Rio Tinto
DM201510-2088
2015
Rough-PolishedIsrael's new AML law for diamond industry goes into effect Sept. 15th Money Laundering lawrough-polished.com, Sept. 14, 1/4p.Europe, IsraelNews item - legal
DM201510-2089
2015
Rough-PolishedKristall intends to sell a replica of the Grand Imperial Crown for 1 bn rubles.rough-polished.com, Sept. 15, 1/4p.RussiaNews item - Kristall
DM201510-2090
2015
Rough-PolishedLucapa grosses A$ 1 m from Lulo diamond auction.rough-polished.com, Sept. 15, 1/4p.Africa, AngolaNews item - Lucapa
DM201510-2091
2015
Rough-PolishedParagon ecstatic as study results show potential for average diamond value at Mothae.rough-polished.com, Sept. 16, 1/4p.Africa, LesothoNews item - Paragon
DM201510-2092
2015
Rough-PolishedLucapa recovers more 'large special' diamonds from Angola's Lulo.rough-polished.com, Sept. 16, 1/4p.Africa, AngolaNews item - Lucapa
DM201510-2093
2015
Rough-PolishedZim's Aurex diamond to be capacitated. … to enhance "high value" polished diamonds.rough-polished.com, Sept. 18, 1/4p.Africa, ZimbabweNews item - Aurex
DM201510-2094
2015
Rough-PolishedPetra Diamonds says FY 2015 revenue down 10%.rough-polished.com, Sept. 21, 1/4p.Africa, South AfricaNews item - Petra
DM201510-2095
2015
Rough-PolishedBrazil Minerals's diamond, gold mine receives 4 year environmental license renewal.rough-polished.com, Sept. 21, 1/4p.South America, BrazilNews item - Brazil Minerals
DM201510-2096
2015
Rough-PolishedSotheby's to auction 12 carat Blue Moon diamond.rough-polished.com, Sept. 21, 1/4p.GlobalNews item - diamonds notable
DM201510-2097
2015
Rough-PolishedDe Beers says 2015 a more challenging year.rough-polished.com, Sept. 22, 1/4p.GlobalNews item - De Beers
DM201510-2098
2015
Rough-PolishedRio Tinto's rare red and pink Argyle diamonds shine in Hong Kong.rough-polished.com, Sept. 22, 1/4p.AustraliaNews item - Rio Tinto
DM201510-2099
2015
Rough-PolishedPositive indicators for diamond industry ahead of holiday season. WFDB President.rough-polished.com, Sept. 23, 1/4p.GlobalNews item - markets
DM201510-2100
2015
Rough-PolishedLucapa finds two more diamonds weighing over 50 ct at Lulo.rough-polished.com, Sept. 23, 1/4p.Africa, AngolaNews item - Lucapa
DM201510-2101
2015
Rough-PolishedWeak global commodity markets force Rockwell Diamonds to delay equity financing.rough-polished.com, Sept. 23, 1/4p.Africa, South AfricaNews item - Rockwell
DM201510-2102
2015
Rough-PolishedPetra exploration expenditure rises to $ 5.6 million.rough-polished.com, Sept. 24, 1/4p.Africa, South AfricaNews item - Petra
DM201510-2103
2015
Rough-PolishedIndia stands 3rd only after US & Chin a in diamond consumption.rough-polished.com, Sept. 24, 1/4p.IndiaNews item - markets
DM201510-2104
2015
Rough-PolishedFirestone receives first drawdown on $ 7.6m for Liqhobong.rough-polished.com, Sept. 24, 1/4p.Africa, LesothoNews item - Firestone
DM201510-2105
2015
Rough-PolishedRio Tinto sees sparkle fade from Chinese diamond demand.rough-polished.com, Sept. 25, 1/4p.ChinaNews item - Rio Tinto
DM201511-2158
2015
Rough-PolishedDe Beers sees great opportunities for diamond industry in India.rough-polished.com, Sept. 28, 1/4p.IndiaNews item - De Beers
DM201511-2159
2015
Rough-PolishedAmnesty International reports on Blood Diamonds from CAR.rough-polished.com, Sept. 28, 1/4p.Africa, Central African RepublicNews item - legal
DM201511-2160
2015
Rough-PolishedFIMI: India must hike spending on mineral exploration.rough-polished.com, Sept. 28, 1/4p.IndiaNews item - FMFI
DM201511-2161
2015
Rough-PolishedAri Epstein, CEO of AWDC: diamond pipeline to unclog and demand to pick up in 2-3 months.rough-polished.com, Sept. 28, 1p.GlobalNews item - AWDC
DM201511-2162
2015
Rough-PolishedAngola made great strides as KP chair.rough-polished.com, Sept. 29, 1/4p.Africa, AngolaNews item - KP
DM201511-2163
2015
Rough-PolishedNamibia, De Beers yet to sign diamond sales deal - report.rough-polished.com, Sept. 30, 1/4p.Africa, NamibiaNews item - De Beers
DM201511-2164
2015
Rough-PolishedLucapa recovers 90.32 ct gem… Mining Block 8 at Lulo.rough-polished.com, Oct. 1, 1/4p.Africa, AngolaNews item - Lucapa
DM201511-2165
2015
Rough-PolishedParagon Diamonds issues revenues forecast for Lesotho mines. Lemphane and Mothaerough-polished.com, Oct. 1, 1/4p.Africa, LesothoNews item - Paragon
DM201511-2166
2015
Rough-PolishedIndia's BDB ( Bharat Diamond Bourse) in Mumbai has banned the trade in synthetic diamonds effective Otober 1.rough-polished.com, Oct. 5, 1/4p.IndiaNews item - synthetics
DM201511-2167
2015
Rough-PolishedAmnesty accuses Sodiam of stockpiling CAR conflict diamonds worth $ 7 m.rough-polished.com, Oct. 5, 1/4p.Africa, Central African RepublicNews item - Sodiam
DM201511-2168
2015
Rough-PolishedParagon Diamonds inks $ 15 m deal for Lesotho mines development.rough-polished.com, Oct. 5, 1/4p.Africa, LesothoNews item - Paragon
DM201511-2169
2015
Rough-PolishedSarine introduced Meteor system for inclusion mapping of smaller stones.rough-polished.com, Oct. 5, 1/4p.TechnologyNews item - Sarine
DM201511-2170
2015
Rough-PolishedTax revenue from diamond sales in the Arkhangelsk region up 4.5 times to 930 million rubles.rough-polished.com, Oct. 2, 1/4p.Russia, Kola Peninsula, ArchangelNews item - legal
DM201511-2171
2015
Rough-PolishedAlrosa to introduce diamond bourse project to Trutnev and Siluanov. rough-polished.com, Oct. 6, 1/4p.RussiaNews item - bourse
DM201511-2172
2015
Rough-PolishedGokhran bought more than half of polished diamonds required by quota from Kristall.rough-polished.com, Oct. 6, 1/4p.RussiaNews item - Kristall
DM201511-2173
2015
Rough-PolishedThe replica of the Great Imperial Crown of the Russian empire is a masterpiece of Russian gem cutters and evidence that they are among the best artisans in the world.rough-polished.com, Oct. 5, 1p.RussiaNews item - Kristall
DM201511-2174
2015
Rough-PolishedAlrosa to implement pillar mining at the Aikhal underground mine.rough-polished.com, Oct. 7, 1/4p.RussiaNews item - Alrosa
DM201511-2175
2015
Rough-PolishedBlueRock Diamonds gets UK 400k to fund SA operations. Kareevielrough-polished.com, Oct. 7, 1/4p.Africa, South AfricaNews item - BlueRock
DM201511-2176
2015
Rough-PolishedAlrosa extracts another king-size diamond, this time weighing 103 carats. Aikhalrough-polished.com, Oct. 9, 1/4p.RussiaNews item - Alrosa
DM201511-2177
2015
Rough-PolishedBotswana diamond output continues on downward projectory. rough-polished.com, Oct. 9, 1/4p.Africa, BotswanaNews item - production
DM201511-2178
2015
Rough-PolishedDiamcor Q2 diamond sales up.rough-polished.com, Oct. 9, 1/4p.Africa, South AfricaNews item - Diamcor
DM201511-2179
2015
Rough-PolishedAlrosa received a high rating for corporate goverance practice.rough-polished.com, Oct. 12, 1/4p.RussiaNews item - Alrosa
DM201511-2180
2015
Rough-PolishedEndiama boss blames soft market on "poor" marketing.rough-polished.com, Oct. 12, 1/4p.Africa, AngolaNews item - Endiama
DM201511-2181
2015
Rough-PolishedSynthetic stones will not be considered precious stones in Russia - Moiseev.rough-polished.com, Oct. 15, 1/4p.RussiaNews item - synthetics
DM201511-2182
2015
Rough-PolishedZimbabwe seeks partners to explore over 100 kimberlites across the country.rough-polished.com, Oct. 15, 1/4p.Africa, ZimbabweNews item - legal
DM201511-2183
2015
Rough-PolishedZim diamond output continues to plummet.rough-polished.com, Oct. 15, 1/4p.Africa, ZimbabweNews item - economics
DM201511-2184
2015
Rough-PolishedLucapa pockets over $ A 5 million from latest Lulo diamonds sale.rough-polished.com, Oct. 14, 1/4p.Africa, AngolaNews item - Lucapa
DM201511-2185
2015
Rough-PolishedZim mines minister: not" so sure we have a diamond sector' anymore.rough-polished.com, Oct. 16, 1/4p.Africa, ZimbabweNews item - Marange
DM201511-2186
2015
Rough-PolishedForced consolidation of Zim diamond mining firms: we are shooting ourselves in the foot, says lawyer.rough-polished.com, Oct. 16, 1/4p.Africa, ZimbabweNews item - legal
DM201511-2187
2015
Rough-PolishedBoard appointments taking place at Diamond Producers association.rough-polished.com, Oct. 19, 1/4p.GlobalNews item - DPA
DM201511-2188
2015
Rough-PolishedDe Beers sightholders defer 50pc of allocated goods at October sight.rough-polished.com, Oct. 19, 1/4p.GlobalNews item - De Beers
DM201511-2189
2015
Rough-PolishedRio Tinto Diamonds puts production on hold at Argyle; reduces production forecast for Q4.rough-polished.com, Oct. 19, 1/4p.AustraliaNews item - Rio Tinto
DM201511-2190
2015
Rough-PolishedWe should look at the chain of warranty as a solid ally of the Kimberley Process - S. Fischlerrough-polished.com, Oct. 19, 1p.GlobalNews item - KP
DM201511-2191
2015
Rough-PolishedAlrosa produced 29.6 million carats of diamonds driving sales to $ 2.7 billion in the first nine months of 2015.rough-polished.com, Oct. 21, 1/4p.RussiaNews item - Alrosa
DM201511-2192
2015
Rough-PolishedRockwell Diamonds Q2 revenue up 32%.rough-polished.com, Oct. 21, 1/4p.Africa, South AfricaNews item - Rockwell
DM201511-2193
2015
Rough-PolishedLucara gets nod to extract samples from BK02 kimberlite.rough-polished.com, Oct. 21, 1/4p.Africa, BotswanaNews item - Lucara
DM201511-2194
2015
Rough-PolishedKennady completes Kelvin diamond valuation.rough-polished.com, Oct. 21, 1/4p.Canada, Northwest TerritoriesNews item - Kennady
DM201511-2195
2015
Rough-PolishedZim needs $ 4 billion by 2020 to finance mining activities.rough-polished.com, Oct. 20, 1/4p.Africa, ZimbabweNews item - economics
DM201511-2196
2015
Rough-PolishedDe Beers Q3 diamond output drops 27% to 6 m ct as weak market conditions persist.rough-polished.com, Oct. 22, 1/4p.GlobalNews item - De Beers
DM201511-2197
2015
Rough-PolishedLucapa finds 14 more "special" diamonds at Lulo.rough-polished.com, Oct. 22, 1/4p.Africa, AngolaNews item - Lucapa
DM201511-2198
2015
Rough-PolishedZim's Murowa diamonds mothballed.rough-polished.com, Oct. 22, 1/4p.Africa, ZimbabweNews item - Marange
DM201511-2199
2015
Rough-PolishedLaboratory grown diamonds are now a fact of life for the industry. T. Moses ( GIA)rough-polished.com, Oct. 23, 1/4p.TechnologyNews item - synthetics
DM201512-2271
2015
Rough-PolishedLucapa awarded prospecting licence in Botswana's Orapa area.rough-polished.com, Oct. 27, 1/4p.Africa, BotswanaNews item - Lucapa
DM201512-2272
2015
Rough-PolishedZim mines minister Chidhakwa pressed to explain use of diamond revenue.rough-polished.com, Oct. 27, 1/4p.Africa, ZimbabweNews item - legal
DM201512-2273
2015
Rough-PolishedPetra Q1 output up marginally.rough-polished.com, Oct 29, 1/4p.Africa, South AfricaNews item - Petra
DM201512-2274
2015
Rough-PolishedAlrosa's net profit on RAS dropped 16% to 19.9 bn rubles in Jan-Sep.rough-polished.com, Oct. 28, 1/4p.RussiaNews item - Alrosa
DM201512-2275
2015
Rough-PolishedShore Gold released an updated diamond valuation results from Star-Orion South mine.rough-polished.com, Oct. 28, 1/4p.Canada, SaskatchewanNews item - Shore Gold
DM201512-2276
2015
Rough-PolishedDe Beers says regional synergy on diamond beneficiation good for SA.rough-polished.com, Oct. 30, 1/4p.Africa, South AfricaNews item - De Beers
DM201512-2277
2015
Rough-PolishedZim ups levy for miners to fund exploration activity.rough-polished.com, Oct. 30, 1/4p.Africa, ZimbabweNews item - legal
DM201512-2278
2015
Rough-PolishedSA diamond manufacturers told to turn "viscious circle of destruction" into virtuous circle of innovation".rough-polished.com, Oct. 30, 1/4p.Africa, South AfricaNews item - beneficiation
DM201512-2279
2015
Rough-PolishedKennady Diamonds announces updates Kennady North drilling.rough-polished.com, Nov. 3, 1/4p.Canada, Northwest TerritoriesNews item - Kennady
DM201512-2280
2015
Rough-PolishedUp to 3 billion carats of synthetic diamonds nourish jewelery market - media.rough-polished.com, Nov. 3, 1/4p.GlobalNews item - synthetics
DM201512-2281
2015
Rough-PolishedStellar Diamonds gets $ 2.65 m working capital. Tongo and Baoulerough-polished.com, Nov. 3, 1/4p.Africa, Sierra LeoneNews item - Stellar
DM201512-2282
2015
Rough-PolishedPolished diamond prices soften in October.rough-polished.com, Nov. 6, 1/4p.GlobalNews item - prices
DM201512-2283
2015
Rough-PolishedBotswana rough diamonds exports continues to fall.rough-polished.com, Nov. 6, 1/4p.Africa, BotswanaNews item - exports
DM201512-2284
2015
Rough-PolishedZim diamond mining firms told to pay up or risk losing shares in new consolidated firm. ZCDCrough-polished.com, Nov. 6, 1/4p.Africa, ZimbabweNews item - ZCDC
DM201512-2285
2015
Rough-PolishedGokhran sold $ 1.16 m worth of diamonds at its last tender of the year.rough-polished.com, Nov. 5, 1/4p.RussiaNews item - Gokhran
DM201512-2286
2015
Rough-PolishedDiamond Corp sees production ramp up at Lace year end, raises cash flow challenges.rough-polished.com, Nov. 5, 1/4p.Africa, South AfricaNews item - DiamondCorp
DM201512-2287
2015
Rough-PolishedZim mines minister says Marange licences expired.rough-polished.com, Nov. 5, 1/4p.Africa, ZimbabweNews item - Marange
DM201512-2288
2015
Rough-PolishedDiamond exploration projects benefiting Angolans - mines minister.rough-polished.com, Nov. 5, 1/4p.Africa, AngolaNews item - legal
DM201512-2289
2015
Rough-PolishedRussian government distinguished the work of scientists and engineers in diamond mining. ( permafrost)rough-polished.com, Nov. 9, 1/4p.Russia, YakutiaNews item - mining
DM201512-2290
2015
Rough-PolishedAngola rakes in about $ 100 m from Sept. diamond sales.rough-polished.com, Nov. 9, 1/4p.Africa, AngolaNews item - economics
DM201512-2291
2015
Rough-PolishedLucara Diamond 3 Q revenues top $ 91 million.rough-polished.com, Nov. 10, 1/4p.Africa, BotswanaNews item - Lucara
DM201512-2292
2015
Rough-PolishedStellar says Ebola-free Sierra Leone to benefit from its diamond deposits.rough-polished.com, Nov. 10, 1/4p.Africa, Sierra LeoneNews item - Stellar
DM201512-2293
2015
Rough-PolishedRio Tinto's Argyle pink diamonds tender delivers spectacular results.rough-polished.com, Nov. 11, 1/4p.AustraliaNews item - Rio Tinto
DM201512-2294
2015
Rough-PolishedGem Diamonds revises 2015 production guidance for Letseng.rough-polished.com, Nov. 13, 1/4p.Africa, LesothoNews item - Gem Diamonds
DM201512-2295
2015
Rough-PolishedLisbon: a new diamond exchange in the offing. ( private with private investors)rough-polished.com, Nov. 13, 1/4p.Europe, SpainNews item - diamond exchange
DM201512-2296
2015
Rough-PolishedThe downturn should stop by the middle of next year. Kristallrough-polished.com, Nov. 17, 1/4p.RussiaNews item - Kristall
DM201512-2297
2015
Rough-PolishedLucapa rakes in A$2.1 m from latest Lulo diamond sale.rough-polished.com, Nov. 17, 1/4p.Africa, AngolaNews item - Lucapa
DM201512-2298
2015
Rough-PolishedStellar secures loan to resume trial mining at Baoule, apply for Tongo mining licence.rough-polished.com, Nov. 17, 1/4p.Africa, Sierra LeoneNews item - Stellar
DM201512-2299
2015
Rough-PolishedDiamond Corp commissions conveyor belt at Lace mine.rough-polished.com, Nov. 16, 1/4p.Africa, South AfricaNews item - DiamondCorp
DM201512-2300
2015
Rough-PolishedParagon provisionally suspends shares over funding uncertainty.rough-polished.com, Nov. 18, 1/4p.Africa, LesothoNews item - Paragon
DM201512-2301
2015
Rough-PolishedAlrosa to update its consolidated budget for 2015.rough-polished.com, Nov. 17, 1/4p.RussiaNews item - Alrosa
DM201512-2302
2015
Rough-PolishedLucara finds 1,111 cart diamond in Botswana.rough-polished.com, Nov. 19, 1/4p.Africa, BotswanaNews item - Lucara
DM201512-2303
2015
Rough-PolishedLucara pockets $ 30 million from second exceptional stone tender.rough-polished.com, Nov. 18, 1/4p.Africa, BotswanaNews item - Lucara
DM201512-2304
2015
Rough-PolishedLucara recovers two more large white stones in Botswana. 813 and 374 Karowerough-polished.com, Nov. 20, 1/4p.Africa, BotswanaNews item - Lucara
DM201512-2305
2015
Rough-PolishedDominion Diamond sales drop 35% in Q3 2016.rough-polished.com, Nov. 23, 1/4p.Canada, Northwest TerritoriesNews item - Dominion
DM201512-2306
2015
Rough-PolishedPeregrine Diamonds announces $ 7 m rights issue to fund mining projects.rough-polished.com, Nov. 23, 1/4p.Canada, Nunavut, Baffin IslandNews item - Peregrine
DM201512-2307
2015
Rough-PolishedDPA's marketing iniative excites Indian diamond industry.rough-polished.com, Nov. 24, 1/4p.IndiaNews item - DPA
DM201512-2308
2015
Rough-PolishedBotswana Diamonds loss narrows during last fiscal year.rough-polished.com, Nov. 24, 1/4p.Africa, BotswanaNews item - Botswana Diamonds
DM201512-2309
2015
Rough-PolishedLucapa readies for next phase of Lulo exploration work.rough-polished.com, Nov. 24, 1/4p.Africa, AngolaNews item - Lucapa
DM201512-2310
2015
Rough-PolishedAlrosa reports Q3 and 9m IFRS results.rough-polished.com, Nov. 25, 1/4p.RussiaNews item - Alrosa
DM201512-2311
2015
Rough-PolishedOnly 4 of 13 diamond cutting, polishing factories in Namibia operational - minister.rough-polished.com, Nov. 25, 1/4p.Africa, NamibiaNews item - diamond cutting
DM201512-2312
2015
Rough-PolishedStellar Diamonds narrows FY losses to Lbs 3.05 m. Baoulerough-polished.com, Nov. 26, 1/4p.Africa, GuineaNews item - Stellar
DM201512-2313
2015
Rough-PolishedBotswana diamond cutting, polishing sector to have more work hours, days.rough-polished.com, Nov. 26, 1/4p.Africa, BotswanaNews item - cutting, polishing
DM201512-2314
2015
Rough-PolishedDiamond beneficiation remains Namibia's top priority.rough-polished.com, Nov. 26, 1/4p.Africa, NamibiaNews item - beneficiation
DM201512-2315
2015
Rough-PolishedHSBC says Anglo could rake in $ 10 b from De Beers IPO.rough-polished.com, Nov. 27, 1/4p.GlobalNews item - De Beers
DM201512-2316
2015
Rough-PolishedSupply more rough diamond to factories, WFDB urges southern Africa.rough-polished.com, Nov. 27, 1/4p.Africa, South AfricaNews item - WFDB
DS201511-1873
2013
Ruiz Cruz, M.D.Are nanotubes and carbon nanostructures the precursors of coexisting graphite and microdiamonds in UHP rocks.Diamond and Related Materials, Vol. 40, pp. 24-31.TechnologyMicrodiamonds - responses

Abstract: A transmission electron microscopy study of garnet from diamond-grade gneisses of the Betic Cordillera (Spain) has revealed the presence of abundant, previously unrecognized, nanosized carbonaceous grains, coexisting with micrometer-sized graphite and diamond. The nanosized particles occur as multiwall nanotubes, and as polyhedral and quasi-spherical graphite + diamond nanoparticles, whereas larger graphite particles appear as rods and as tabular crystals. The topotactic relationships between graphite in nanoparticles and in micrometer-sized particles and the host garnet suggest that carbon nano- and microparticles precipitated from an originally homogeneous solid solution of carbon in the garnet. Based on orientation relationships and on experimental data it is suggested that the three main types of nanosized particles (nanospheres, polyhedral particles and nanotubes) were the precursor of the three main types of larger carbon phases (diamond, tabular and rod-shaped graphite particles, respectively). It is interpreted, as in the case of diamond-graphite nanocomposites, that diamond formation in the core of the nanoparticles is due to an increase of the cross-links between the layers, and then, to the collapse, at a certain point, of the whole graphite structure into diamond. This finding opens a new door for explaining the origin of some metamorphic diamonds and of coexisting graphite and diamond in ultrahigh pressure rocks.
DS201512-1962
2015
Rukhov, A.S., Bell, K., Amelin, Y.Carbonatites, isotopes and evolution of continental mantle: an overview.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov. 13-14, pp. 39-64.MantleCarbonatite
DS201510-1800
2014
Ryabchikov, I.D., Kaminsky, F.V.The composition of the lower mantle: source of diamonds with high-pressure mineral inclusions.Deep-seated magmatism, its sources and plumes, Proceedings of XIII International Workshop held 2014., Vol. 2014, pp. 32-38.MantleExperimental petrology - ferropericlase
DS201502-0094
2015
Ryabov, V.The Early Triassic dyke belt in northern margin of Siberian platform.Economic Geology Research Institute 2015, Vol. 17,, # 2215, 1p. AbstractRussiaMinette, alnoite
DS201509-0425
2015
Ryberg, T., Haberland, C., Haberlau, T., Weber, M.H., Klaus, B., Behrmann, J.H., Jokat, W.Crustal structure of northwest Namibia: evidence for plume rift continent interaction.Geology, Vol. 43, 8,pp. 739-Africa, NamibiaPlume, rifting

Abstract: The causes for the formation of large igneous provinces and hotspot trails are still a matter of considerable dispute. Seismic tomography and other studies suggest that hot mantle material rising from the core-mantle boundary (CMB) might play a significant role in the formation of such hotspot trails. An important area to verify this concept is the South Atlantic region, with hotspot trails that spatially coincide with one of the largest low-velocity regions at the CMB, the African large low shear-wave velocity province. The Walvis Ridge started to form during the separation of the South American and African continents at ca. 130 Ma as a consequence of Gondwana breakup. Here, we present the first deep-seismic sounding images of the crustal structure from the landfall area of the Walvis Ridge at the Namibian coast to constrain processes of plume-lithosphere interaction and the formation of continental flood basalts (Paraná and Etendeka continental flood basalts) and associated intrusive rocks. Our study identified a narrow region (<100 km) of high-seismic-velocity anomalies in the middle and lower crust, which we interpret as a massive mafic intrusion into the northern Namibian continental crust. Seismic crustal reflection imaging shows a flat Moho as well as reflectors connecting the high-velocity body with shallow crustal structures that we speculate to mark potential feeder channels of the Etendeka continental flood basalt. We suggest that the observed massive but localized mafic intrusion into the lower crust results from similar-sized variations in the lithosphere (i.e., lithosphere thickness or preexisting structures).
DS201510-1801
2014
Sablukov, S.M., Sablukova, L.I., Stegnitskiy, Yu.B., Karpenko, M.A.Origin of the mantle xenoliths with green garnets from kimberlites ( Dike Newlands, southern Africa and Nyurbinskaya pipe, Yakutia).Deep-seated magmatism, its sources and plumes, Proceedings of XIII International Workshop held 2014., Vol. 2014, pp. 178-202.Africa, South Africa, Russia, YakutiaDeposit - Dike Newlands, Nyurbinskaya

Abstract: Green garnets occur in concentrates of diamondiferous kimberlite bodies in Yakutia (Udachnaya, Mir, etc.), South Africa (Newlands, Bellsbank), Venezuela (Guaniamo sills), and Canada (Mud Lake field). Mantle xenoliths of rocks containing such garnets are very rare. We found peridotite xenoliths with green garnet in situ in kimberlites of the Newlands dike. Xenoliths are irregular in form, 4.5*1.9 cm, 1.5*0.8 cm, and 1.0*0.5 cm in size, and have similar modal compositions: gar(70)+ol(28)+sp(2), gar(9)+ol(90)+sp(1) and gar(50)+ol(30)+sp(20). Rock texture is medium-crystalline, while structure is massive. We also identified a garnet macrocryst of 0.5*0.4 cm in size with a pale green kelyphytic rim. Garnet composition in the studied samples is quite constant and is characterized by the high Cr2O3 content (10.94-11.99%) and CaO content (19.52-24.94%) at the reduced contents of TiO2 (0.24-0.52%). The chrome spinel is high Cr2O3 (55%) content and the low TiO2 (0.5-0.6%) content. Olivine is high-Mg (Fo95), but elevated CaO content (0.09%). Isotopic composition of oxygen in garnet (?18O = 4.05-4.25 pm) and olivine (?18O = 4.91 pm) differs drastically from the mantle values. Rb-Sr and Sm-Nd isotopic composition show the relatively "young" model age of the sample relative to the depleted mantle (1.78 billion years), the age of formation of this rocks is also relatively "young" - probable mezoproterozoic. In kimberlites and placers of the Nyurbinskaya pipe (Nakyn field, Yakutia) there are 4 green garnet grains of 0.5-2.0 mm in size, including one intergrowth gar+sp. Most garnets are characterized by the higher CaO (18.06-22.87%) and TiO2 (1.46, 1.65, 1.75%) contents not noted before for similar garnets. Studied green garnets have the similar "sine wave" type of REE distribution for low-Ti garnets and a "raised" type of REE distribution with enrichment in medium and light REE for high-Ti garnet. All green garnets are characterized by an increased content of light REE and Sc. High-Ti garnets are characterized by an increased content of light and middle REE, as well as titanium, and a particularly sharply increased content of Zr (!). Paragenesis ol+sp is formed at 805oand 23.4 kbar, and paragenesis ol+gar is formed at 1080oand 23.8 kbar. The rocks are characterized by nonequilibrium paragenesis ol+sp+gar and formation at moderate depths (80-90 km) under conditions of high heat flow (52-55 mW/m2). Judging from modal composition of studied xenoliths (absence of clinopyroxene), variations in chemical compositions and trace element compositions, relatively "young" model age and non-mantle isotopy of oxygen in garnets, these rocks are not "wehrlites" and likely represent metasomatic rocks such as uvarovite-chromite veins or schlierens at the moderate depths of upper mantle - it is similar to uvarovite-chromite veins of the metasomatic or a hydrothermal origin in the crustal serpentinites.
DS201511-1874
2015
Saha, A., Manikyamba, C., Santosh, M., Ganguly, S., Khelen, A.C.Platinum Group Elements ( PGE) geochemistry of komatiites and boninites from Dharwar Craton, India: implications for mantle melting processes.Journal of Asian Earth Sciences, Vol. 105, pp. 300-319.IndiaBoninites

Abstract: High MgO volcanic rocks having elevated concentrations of Ni and Cr are potential hosts for platinum group elements (PGE) owing to their primitive mantle origin and eruption at high temperatures. Though their higher PGE abundance is economically significant in mineral exploration studies, their lower concentrations are also valuable geochemical tools to evaluate petrogenetic processes. In this paper an attempt has been made to evaluate the PGE geochemistry of high MgO volcanic rocks from two greenstone belts of western and eastern Dharwar Craton and to discuss different mantle processes operative at diverse geodynamic settings during the Neoarchean time. The Bababudan greenstone belt of western and Gadwal greenstone belt of eastern Dharwar Cratons are dominantly composed of high MgO volcanic rocks which, based on distinct geochemical characteristics, have been identified as komatiites and boninites respectively. The Bababudan komatiites are essentially composed of olivine and clinopyroxene with rare plagioclase tending towards komatiitic basalts. The Gadwal boninites contain clinopyroxene, recrystallized hornblende with minor orthopyroxene, plagioclase and sulphide minerals. The Bababudan komatiites are Al-undepleted type (Al2O3/TiO2 = 23-59) with distinctly high MgO (27.4-35.8 wt.%), Ni (509-1066 ppm) and Cr (136-3036 ppm) contents. These rocks have low ?PGE (9-42 ppb) contents with 0.2-2.4 ppb Iridium (Ir), 0.2-1.4 ppb Osmium (Os) and 0.4-4.4 ppb Ruthenium (Ru) among Iridium group PGE (IPGE); and 1.4-16.2 ppb Platinum (Pt), 2.8-19 ppb Palladium (Pd) and 0.2-9.8 ppb Rhodium (Rh) among Platinum group PGE (PPGE). The Gadwal boninites are high-Ca boninites with CaO/Al2O3 ratios varying between 0.8 and 1.0, with 12-24 wt.% MgO, 821-1168 ppm Ni and 2307-2765 ppm Cr. They show higher concentration of total PGE (82-207 ppb) with Pt concentration ranging from 13 to 19 ppb, Pd between 65 and 180 ppb and Rh in the range of 1.4-3 ppb compared to the Bababudan komatiites. Ir, Os and Ru concentrations range from 0.6 to 2.2 ppb, 0.2 to 0.6 ppb and 1.4 to 2.6 ppb respectively in IPGE. The PGE abundances in Bababudan komatiites were controlled by olivine fractionation whereas that in Gadwal boninites were influenced by fractionation of chromite and sulphides. The Al-undepleted Bababudan komatiites are characterized by low CaO/Al2O3, (Gd/Yb)N, (La/Yb)N, with positive Zr, Hf, Ti anomalies and high Cu/Pd, Pd/Ir ratios at low Pd concentrations suggesting the derivation of parent magma by high degrees (>30%) partial melting of mantle under anhydrous conditions at shallow depth with garnet as a residual phase in the mantle restite. The komatiites are geochemically analogous to Al-undepleted Munro type komatiites and their PGE compositions are consistent with Alexo and Gorgona komatiites. The S-undersaturated character of Bababudan komatiites is attributed to decompression and assimilation of lower crustal materials during magma ascent and emplacement. In contrast, the higher Al2O3/TiO2, lower (Gd/Yb)N, for Gadwal boninites in combination with negative Nb, Zr, Hf, Ti anomalies and lower Cu/Pd at relatively higher Pd/Ir and Pd concentrations reflect high degree melting of refractory mantle wedge under hydrous conditions in an intraoceanic subduction zone setting. Higher Pd/Ir ratios and S-undersaturation of these boninites conform to influx of fluids derived by dehydration of subducted slab resulting into high fluid pressure and metasomatism of mantle wedge.
DS201511-1875
2015
Saha, L., Frei, D., Gerdes, A., Pat, J.K., Sarkar, S., Patole, V., Bhandari, A., Nasipuri, P.Crustal geodynamics from the Archean Bundelk hand craton, India: constraints from zircon U-Pb-Hf isotope studies.Geological Magazine, Rapid communication Oct. 14p.IndiaTectonics, geochronology

Abstract: A comprehensive study based on U-Pb and Hf isotope analyses of zircons from gneisses has been conducted along the western part (Babina area) of the E–W-trending Bundelkhand Tectonic Zone in the central part of the Archaean Bundelkhand Craton. 207Pb-206Pb zircon ages and Hf isotopic data indicate the existence of a felsic crust at ~ 3.59 Ga, followed by a second tectonothermal event at ~ 3.44 Ga, leading to calc-alkaline magmatism and subsequent crustal growth. The study hence suggests that crust formation in the Bundelkhand Craton occurred in a similar time-frame to that recorded from the Singhbhum and Bastar cratons of the North Indian Shield.
DS201501-0028
2014
Salomon, E., Koehn, D., Passchier, C.Brittle reactivation of ductile shear zones in NW Namibia in relation to South Atlantic rifting. Tectonics, Vol. 34, pp. 70-85.Africa, NamibiaTectonics
DS201511-1876
2015
Salzmann, C.G., Murray, B.J., Shephard, J.J.Extent of stacking disorder in diamond. ( hexagonal)Diamond and Related Materials, Vol. 59, pp. 69-72.TechnologyLonsdaleite

Abstract: Hexagonal diamond has been predicted computationally to display extraordinary physical properties including a hardness that exceeds cubic diamond. However, a recent electron microscopy study has shown that so-called hexagonal diamond samples are in fact not discrete materials but faulted and twinned cubic diamond. We now provide a quantitative analysis of cubic and hexagonal stacking in diamond samples by analysing X-ray diffraction data with the DIFFaX software package. The highest fractions of hexagonal stacking we find in materials which were previously referred to as hexagonal diamond are below 60%. The remainder of the stacking sequences are cubic. We show that the cubic and hexagonal sequences are interlaced in a complex way and that naturally occurring Lonsdaleite is not a simple phase mixture of cubic and hexagonal diamond. Instead, it is structurally best described as stacking disordered diamond. The future experimental challenge will be to prepare diamond samples beyond 60% hexagonality and towards the so far elusive 'perfect' hexagonal diamond.
DC201502-1684
2015
Sanatana Diamonds Inc.Shareholders update : Green Lake prospect.Sanatana Resources, Jan. 23, 1/4p.Canada, SaskatchewanNews item - press release
DS201512-1963
2015
Sappin, A-A., Beaudoin, G.Rare earth elements in Quebec, Canada: main deposit types and their economic potential.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov. 13-14, pp. 265-Canada, QuebecRare earths

Abstract: Rare earth elements (REE) are strategic metals vital to global economic growth because they are used in a wide range of high-technology industries (e.g., energy, transport, and telecommunications; Walters et al., 2011). The world production and reserves are mainly owned by China. In 2008, the Chinese government introduced export quotas on rare metals, which led to a global search for new sources of REE. Québec has substantial REE resources (Simandl et al., 2012), which may contribute to future production. Gosselin et al. (2003) and Boily and Gosselin (2004) inventoried rare metals (REE, Zr, Nb, Ta, Be, and Li) occurrences and deposits in Québec and, based mainly on lithological association, subdivided them into seven types: 1) deposits associated with peraluminous granitic complexes; 2) deposits associated with carbonatite complexes; 3) deposits associated with peralkaline complexes; 4) deposits associated with placers and paleoplacers; 5) iron oxide, Cu, REE, and U deposits; 6) deposits associated with granitic pegmatites, migmatites, and peraluminous to metaluminous granites; and 7) deposits associated with calc-silicate and metasomatized rocks or skarns. Herein we review REE mineralization in the province, adopting a more genetic scheme based on the classifi cation of Walters et al. (2011). The REE occurrences and deposits are subdivided into primary deposits, formed by magmatic and/ or hydrothermal processes, and secondary deposits, formed by sedimentary processes and leaching. Primary deposits are then subdivided into four types: 1) carbonatite complex-associated; 2) peralkaline igneous rock-associated; 3) REE-bearing Iron- Oxide-Copper-Gold (IOCG) deposits; and 4) hyperaluminous/ metaluminous granitic pegmatite-, granite-, and migmatiteassociated deposits, and skarns. Secondary deposits are subdivided into two deposit types: 1) placers and paleoplacers and 2) REE-bearing ion-adsorption clays.
DS201509-0426
2015
Saraiva dos Santos, T.J., Da Silva Amaral, W., Ancelmi, M.F., Pitarello, M.Z., Fuck, R.A., Dantas, E.L.U-Pb age of coesite bearing eclogite from NW Borborema Province, NE Brazil: implications for western Gondwana assembly.Gondwana Research, Vol. 28, pp. 1183-1196.South America, BrazilUHP

Abstract: The Late Neoproterozoic assembly of western Gondwana played an important role in the subduction of oceanic and continental lithospheres. Such event was also a source of arc magmatism, reworking of cratonic margins and development of ultra-high pressure (UHP) suture zones. In the Borborema province, NE Brazil, we have described for the first time UHP rocks enclosed within gneiss migmatite and calc-silicate rocks. They bear coesite included in atoll-type garnet from metamafic rocks, identified by petrographic study and Raman microspectroscopy analysis. U-Pb zircon dating of the leucosome of the migmatites and the calc-silicate rock displays, concordant ages of 639 ± 10 Ma and 649.7 ± 5 Ma, respectively, here interpreted as the minimum age of the eclogitization event in the region. U-Pb zircon dating of the coesite-bearing rock defined a concordia age of 614. 9 ± 7.9 Ma that comprised the retrograde eclogitic conditions to amphibolite facies. The UHP rocks, mostly retrograded to garnet amphibolites, occur enclosed in the Paleoproterozoic continental block composed of calc-silicate rocks, migmatized sillimanite gneiss, mylonitic augen gneiss and granitic and tonalitic gneiss along a narrow N-S oriented belt between the Santa Quitéria magmatic arc and the Transbrasiliano lineament. This block was involved in the subduction to UHP eclogite depths, and was retrogressed to amphibolite during its exhumation and thrusting. Our data indicate an important Neoproterozoic transcontinental suture zone connecting the Pharusian belt with Borborema Province, and probably with the Brasília belt in central Brazil.
DS201504-0215
2015
Sarkar, C., Heaman, L.M., Pearson, D.G.Duration and periodicity of kimberlite volcanic activity in the Lac de Gras kimberlite field, Canada and some recommendations for kimberlite geochronology.Lithos, Vol. 218-219, pp. 155-166.Canada, Northwest TerritoriesDeposit - Eddie
DM201504-1335
2015
Saskatchewan Geological SurveyDiamond activity Fort a la Corne, Pikoo area.Saskatchewan Exploration and Development Highlights 2014, p. 10.Canada, SaskatchewanNews item - Pikoo
DS201501-0029
2014
Saskatchewan Mining AssociationWhere do diamonds come from and how can we find them? Overview of companies working in Saskatchewan ( Shore Gold, North Arrow, Stornoway)Saskatchewan Mining Association, Fall,Winter p. 5,6.Canada, SaskatchewanBrief overview
DS201511-1877
2015
Sastry, M.D., Mane, S., Gaonkar, M., Bhide, M.K., Desai, S.N., Ramachandran, K.T.Luminescence studies of gemstones and diamonds.International Journal of Luminescence and Applications, Vol. 5, 3, pp. 293-297.TechnologyLuminescence

Abstract: Some of the minerals like Corundum, chryso beryl, beryllium alumino silicate (emerald) and also Diamond exhibit exceptional optical properties[1] and in some cases attractive colours; in India these were recognized quite early since the days of Indus valley civilization. In more recent times there has been a lot of scientific interest in colours and colour modifications in Gem minerals and in Diamonds. Science of gem stones deals with their identification by non destructive means and understanding of origin of colour and excellent optical properties[1]. Optical methods have long been used to obtain properties like ‘Refractive Index’ which still remains an important parameter as a preliminary test to identify the gemstone/mineral. The spectroscopic studies of gem grade minerals are essentially directed towards some of these features in identifying and understanding the spectral properties of chromophores, either chemical impurities and/or radiation induced point defects, in solids. In this context a variety of spectroscopic methods are used to address the problems of the Gem stone identification and identification of origin of colours and colour modification treatments. The methods frequently used in Gem testing labs are the following: (i)Electronic absorption in UV-Visible-NIR range.(ii)UV-Vis excited luminescence, (iii) Vibrational spectra – Absorption in the Infra red range (iv) Vibrational spectra using Light Scattering (Raman spectroscopy) (v)Surface Fluorescence mapping Under deep UV excitation. The present paper deals with the luminescence studies in rubies, sapphires, emeralds and diamonds. Special mention may be made of fluorescence mapping using deep UV excitation (around 205 nm) corresponding to the band gap of diamond. Under such an excitation inter band excitation takes place creating a e-h pair and most of the absorption and subsequent emission being restricted to the surface. This makes surface mapping possible and thereby elucidating the growth patterns. This is invaluable in the diagnostics for the detection of synthetic diamonds. In this introductory presentation on the Luminescence methods in Gemmology, we give a brief account of optical spectroscopic methods which mainly deal with identification of corundum based gem stones (rubies, sapphire) and diamonds including the electronic absorption and luminescence of chromophore centres. In gem testing infrared absorption and Raman scattering methods are main work horses and they will be brought in as and when necessary to give a complete picture.
DS201508-0375
2015
Sautter, V.Martian crustal rocks bear a strong resemblance to tonalite-trondjemite-granodiorites… Earth's continental crust ( 2.5 billion years ago).Physics.org, July 14, 1/4p.MantleCrust - history
DS201502-0095
2014
Saveleva, V.B., Bazarova, E.P., Danilov, B.S.New finds of carbonatite like rocks in the western Baikal region.Doklady Earth Sciences, Vol. 459, 2, pp. 1483-1487.RussiaCarbonatite
DS201512-1964
2015
Saxon, M., Leijd, M., Forrester, K., Berg, J.Geology, mineralogy, and metallurgical processing of the Norra Karr heavy REE deposit, Sweden.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov. 13-14, pp. 97-108.Europe, SwedenRare earths

Abstract: The Norra Kärr peralkaline complex is about 300 km southwest of Stockholm in southern Sweden (Fig. 1). As the only heavy REE deposit in the European Union, Norra Kärr is signifi cant for the security of future REE, zirconium (Zr) and hafnium (Hf) supply (European Commission’s European Rare Earths Competency Network; ERECON, 2015). The project is well serviced by power and other infrastructure that will allow year-round mining and processing. A four-lane highway links Scandinavia to mainland Europe and passes with 1km of Norra Kärr. The skill-rich cities of Linköping and Jönköping, lie within daily commuting distances from Norra Kärr. A rail line that passes within 30 km of the site may be used to transport feed stocks and products. If Norra Kärr is developed, European REE users will no longer require substantial material stockpiles to deal with market uncertainties.
DS201507-0333
2015
Sazonova, L.V., Nosova, A.A., Kargin, A.V., Borisovskiy, S.E., Tretyachenko, V.V., Abazova, Z.M., Griban, Yu.G.Olivine from the Pionerskaya and V. Grib kimberlite pipes, Arkangelsk diamond province, Russia: types, composition, and origin.Petrology, Vol. 23, 3, pp. 227-258.RussiaDeposit - Grib
DS201510-1802
2015
Scheiber-Enslin, S.E., Ebbing, J., Webb, S.J.New depth maps of the main Karoo basin, used to explore the Cape isostatic anomaly, South Africa.South African Journal of Geology, Vol. 118, 3, pp. 225-248.Africa, South AfricaGeophysics - seismics

Abstract: Here we present a comprehensive depth and thickness map of the main Karoo and Cape Basins using borehole and reflection seismic data. The depth to the Whitehill Formation, which is the focus of current shale gas interest within the Karoo, is also mapped. Change: The deepest part of the basin is in the south, along the northern boundary of the Cape Fold Belt (~4000 m in the southwest Karoo and ~5000 m in the southeast; ~5500 to 6000 m sediment thickness). The Whitehill Formation along this boundary reaches a depth of ~3000 m in the southwest and ~4000 m in the southeast. Limited borehole data in the southeastern Karoo show a broad deepening of the basin here compared to the southwestern Karoo. In the southeast near East London faulting has resulted in deepening of the basin close to the coast, with the Whitehill Formation deepening to over ~5000 km. Seismic and borehole data show that the Cape Supergroup pinches out below the Karoo Basin around Beaufort West and Graaff-Reinet in the southern Karoo (32.6°S for the Bokkeveld and 32.4°S for the Table Mountain Group). The Cape Supergroup reaches thicknesses of around 4 km in the south. The gravity effect of these sediments does not account for the Cape Isostatic Anomaly (CIA) in the southern part of the Karoo Basin near Willowmore and Steytlerville, i.e., an ~45 mGal Bouguer gravity low. A refraction seismic profile over the anomaly shows this region is associated with a large volume of low velocity/density shallow sediments (4.5 m/s2, 2500 kg/m3), as well as a low velocity/density anomaly associated with a normal fault and the Klein Winterhoek Thrust Fault (5.5 m/s2, 2650 kg/m3). These low density shallow sediments are explained by uplift of Karoo and Cape sediments of ~2 km or greater that is evident on Soekor reflection seismic data. This deformation has brought lower density shales (1800 to 2650 kg/m3) of the Ecca Group closer to the surface. These shallower features along with a deeper lower crust in this region (6.5 m/s2, 2900 kg/m3) are interpreted to account for the CIA.
DS201502-0096
2014
Schingaro, E., Kullerud, K., laclamita, M., Mesto, E., Scordari, F., Zozulya, D., Erambert, M., Ravna, E.J.K.Yangzhumingite and phlogopite from the Kvaloya lamproite (North Norway): structure, composition and origin.Lithos, Vol. 210-211, pp. 1-13.Europe, NorwayLamproite
DS201511-1878
2015
Schmadicke, E., Gose, J., Reinhardt, J., Will, T.M., Stalder, R.Garnet in cratonic and non-cratonic mantle and lower crustal xenoliths from southern Africa: composition, water in corporation and geodynamic constraints.Precambrian Research, Vol. 270, pp. 285-299.Africa, South Africa, Lesotho, NamibiaKaapvaal craton, Rehoboth Terrane

Abstract: Garnets from kimberlite-hosted mantle and a few xenoliths from the lower crust were investigated for water, major, minor, and trace elements. Xenoliths from the mantle comprise pyroxenite, eclogite, alkremite, and peridotite, and crustal xenoliths are mafic high-pressure granulites. Samples from South Africa, Lesotho, and Namibia comprise two principal settings, Kaapvaal Craton (‘on craton’) and Rehoboth terrane (‘off craton’). The composition of garnet depends on rock type but is unrelated to the setting, except for Ti and Cr. In garnets from ‘off craton’ mantle xenoliths, Ti positively correlates with Cr whereas those from ‘on craton’ samples reveal a negative correlation between both elements. Rare earth element patterns indicative of a metasomatic overprint are observed in garnets from both settings, especially in eclogitic garnet. Water contents in garnet are low and range from <1 to about 40 ppm. No setting-related difference occurs, but a weak correlation between water and rock type exists. Water contents in garnets from eclogite and mafic granulite are lower than those in pyroxenite, alkremite, and peridotite. All garnets are water under-saturated, i.e. they do not contain the maximum amount of water that can be accommodated in the mineral structure. Cratonic and non-cratonic samples also show the same characteristics in the infrared (IR) absorption spectra. An absorption band at 3650 cm-1 is typical for most mantle garnets. Bands at 3520 and 3570 cm-1 are present only in TiO2-rich garnets from the Rehoboth terrane and are ascribed to a Ti-related hydrogen substitution. A number of garnets, especially from the Kaapvaal Craton, contain molecular water in addition to structural water. Molecular water is inhomogeneously distributed at grain scale pointing to local interaction with fluid and to disequilibrium at grain scale. These garnets consistently reveal either submicroscopic hydrous phases or additional IR bands at 3630 and 3610-3600 cm-1 caused by structural water. Both features do not occur in garnets in which molecular water is absent. The observations imply (i) relatively late introduction of fluid, at least in cases where hydrous phases formed, and (ii) a relatively dry environment because only water-deficient garnets are able to incorporate additional structural water. Most importantly, they imply (iii) that the low water contents are primary and not due to water loss during upward transport. This late water influx is not responsible for the metasomatic overprint indicated by garnet REE patterns. The results of this study suggest dry conditions in the lithosphere, including mantle and crustal sections of both the Kaapvaal Craton (‘on craton’) and the Rehoboth terrane (‘off craton’). If the low water contents contributed to the stabilization of the Kaapvaal cratonic root (Peslier et al., 2010) the same should apply to the Rehoboth lithosphere where the same variety of rock types occurs. The extremely low water contents in eclogite relative to pyroxenite may be explained by an oceanic crust origin of the eclogites. Subduction and partial melting would cause depletion of water and incompatible elements. The pyroxenites formed by crystal accumulation in the mantle and did not suffer melt depletion. Such a difference in origin can be reconciled with the low Ti contents in eclogitic garnet and the high Ti contents in pyroxenitic garnet.
DM201510-2060
2015
Schmadicke, E., Will, T.M., Mezger, K.A change of plans for Ekati. It’s a delay for Jas as Dominion beings the Sable kimberlite forward.Resourceclips.com, Sept. 14, 1p.Canada, Northwest TerritoriesNews item - Dominion
DS201511-1879
2015
Schmadicke, E., Will, T.M., Mezger, K.Garnet pyroxenite from the Shackleton Range, Antarctica: intrusion of plume-derived picritic melts in the continental lithosphere during Rodinia breakup.Lithos, Vol. 238, pp. 185-206.AntarcticaPicrite

Abstract: Lenses of ultramafic rocks occur in supracrustal high-grade gneiss in the northern Haskard Highlands, Shackleton Range, East Antarctica. Olivine-bearing garnet pyroxenite is the dominant rock type that is associated with hornblendite and subordinate spinel peridotite and amphibolite. The high-pressure (23-25 kbar) garnet-olivine assemblage of the pyroxenite formed during Pan-African eclogite-facies metamorphism. Associated collisional tectonics led to the incorporation of the ultramafic and mafic rocks in upper crustal rocks of a subducting continental margin. The ultramafic-mafic rocks are tracers of a palaeo-suture zone and are critical for reconstructing Gondwana amalgamation. Thus, it is important to infer the tectonic setting of the rocks prior to emplacement into their current position, i.e. were the rocks part of the oceanic crust, the sub-oceanic, or the sub-continental mantle? Major and trace elements together with Pb and Nd isotope data imply that the precursor rocks of the pyroxenites and hornblendites (the latter being retrogressed pyroxenite equivalents) formed as plume-related melts, with many characteristics typical for ocean-island tholeiitic magmas. Hence, pyroxenite and hornblendite are interpreted as metamorphic equivalents of picritic melts. They differ from most garnet pyroxenites worldwide in composition and genesis. The latter formed as high-pressure clinopyroxene-rich cumulates from basaltic melts. The volumetrically minor amphibolites, sharing many geochemical characteristics with pyroxenites and hornblendites, are also interpreted as metamorphic equivalents of plume-related melts. It is inferred that the picritic melts crystallized at medium- to high-pressure conditions in the upper continental mantle or in the transition zone between mantle and continental crust. The subordinate spinel peridotites are interpreted as fragments of the uppermost, depleted mantle. They are probably the wall rocks into which the picritic melts intruded. The Pb and Nd mantle separation ages of the picritic melts range from 770 to 870 Ma. These model ages are very similar to the emplacement ages of numerous global mafic and ultramafic dykes, which are genetically linked to mantle plume activity that initiated Rodinia rifting and breakup. The protoliths of pyroxenite and related rocks in the Shackleton Range most likely formed during the initial stages of plume magmatism that eventually led to Rodinia breakup.
DS201501-0030
2014
Schmidt, M.W., Gao, C., Golubkova, A., Rohrbach, A., Connolly, J.A.D.Natural moissanite ( SiC) - a low temperature mineral formed from highly fractionated ultra-reducing COH-fluids.Progress in Earth and Planetary Science, Vol. 1, pp. 27-Moissanite
DS201512-1965
2015
Schmidt, N., Kramers, P.The Gahcho Kue mine dewatering experience, winter 2014-2015.43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 93.Canada, Northwest TerritoriesDeposit - Gahcho Kue

Abstract: Construction of the De Beers Gahcho Kué Mine required that a portion of Kennady Lake be dewatered to provide access to kimberlite pipes on the lakebed. The Construction Water Management Plan considered an initial dewatering volume of approximately 18.7 Mm3, to be discharged to two downstream waterbodies (Lake N11 and Kennady Lake Area 8). This dewatering was originally planned to occur during the open water season, after the spring freshet peak. The project received its Type A Water Licence from the Mackenzie Valley Land and Water Board on September 24, 2014, and before that date it had become apparent that winter dewatering would be required to prevent a significant delay in the project development. Potential adverse impacts related to winter dewatering were identified and were primarily related to aufeis development. Aufeis is defined as an ice deposit, formed by vertical growth of layers as thin flows of water are exposed to freezing temperatures. These may have adverse effects on erosion, fish and fish habitat. Action levels for winter dewatering were developed, based on site-specific hydrological characteristics, and were included in the Aquatic Effects Monitoring Program for the Mine. This allowed field measurements to be compared to action levels during the dewatering program. Field measurements included telemetry to monitor lake hydrostatic water surface elevations, as well as periodic visits to the receiving lake outlets and downstream areas to examine ice and flow conditions. Winter dewatering commenced on December 20, 2014, with pumping to Kennady Lake Area 8. Pumping was suspended on January 4, 2015, as the action level for that location was approached. Approximately 779,000 m3 of water was released over 16 days. Dewatering discharges were then pumped to Lake N11, with pumping commencing on February 1, 2015 and continuing through the winter period, as the action level for that location was not exceeded. Over the 103 day period through May 14, 2015, approximately 6,021,000 m3 of water was released. A total of 6,800,000 m3 of water was discharged from Kennady Lake over the winter dewatering period, or about 36% of the planned initial dewatering volume. Winter and subsequent open-water season reconnaissance did not identify any adverse effects due to winter dewatering. This presentation will discuss winter dewatering risks, action level development, field program observations, and factors contributing to the overall success of the program.
DS201508-0376
2015
Schulze, D.J., Davis, D.W., Helmstaedt, H., Joy, B.Timing of the Cenozoic " Great Hydration" event beneath the Colorado Plateau: Th-Pb dating of monazite in Navajo volcanic field metamorphic eclogite xenoliths.Geology, Vol. 43, pp. 727-730.United States, Colorado PlateauDiatremes - Moses Rock, Mule's Ear, Garnet Ridge, Cane Valley, Red Mesa, Buell Park, Green Knobs
DS201506-0294
2015
Science DailyAscent or no ascent? How hot material is stopped in Earth's mantle.Science Daily, 4p.MantleMagmatism
DS201512-1966
2015
Science DailyLife on Earth likely started 4.1 billion years ago, much earlier than scientists thought.Science Daily, Oct. 19, 2p.AustraliaZircon geochronology
DC201506-1685
2015
Scio Diamond Technology CorporationScio Diamond doubles diamond-growing capacity.Scio Diamond Technology Corporation, Apr. 27, 1p.TechnologyNews item - press release
DC201507-1686
2015
Scio Diamond Technology CorporationScio Diamond's lab grown fancy pink diamonds reach retail market USA.Scio Diamond Technology Corporation, June 2, 1p.United StatesNews item - press release
DC201510-2365
2015
SDKA InternationalSubsidiary SDKA Diamonds DMCC announces membership to the Dubai multi commodities centre and the Dubai diamond exchange.SDKA International, Sept. 16, 1p.DubaiNews item - press release
DS201503-0173
2015
Selway, K., Ford, H., Kelemen, P.The seismic mid-lithosphere discontinuity.Earth and Planetary Science Letters, Vol. 414, March 15, pp. 45-57.MantleGeophysics - seismic
DS201510-1803
2015
Shapovalov, Yu.B., Gorbachev, N.S., Kostyuk, A.V., Sultanov, D.M.Geochemical features of carbonatites of the Fennoscandian shield.Doklady Earth Sciences, Vol. 463, 2, pp. 833-838.Europe, Norway, Russia, Kola Peninsula, KareliaCarbonatite

Abstract: The petrochemistry of carbonatites of three formation types were studied: (1) ultrahigh-pressure garnet-containing carbonatites (UHPC) of the Caledonian sheet (Tromsö, Norway); (2) rocks of the carbonatite-lkaline-ultrabasic Kovdor massif (the Kola Peninsula); and (3) rocks of the carbonatite-alkaline-gabbroid Tikshozero massif (north of Karelia). The samples of carbonatites were examined and tested with a microprobe; the microelements were determined using the ICP-MS technique at the Institute of Microelectronics Technology and High Purity Materials (Chernogolovka). The carbonatites of the Kovdor and Tikshozero massifs are characterized by similar negative REE trends, with a degree of REE enrichment of the Tikshozero carbonatites. The UHPC from Tromsö are different from those of the Kovdor and Tikshozero massifs in the negative trend along with lower concentrations of light REEs. The Tromsö UHPC are similar to the carbonatites of the Kovdor and Tikshozero massifs in the trend and concentrations of heavy REEs. The carbonatites of the Fennoscandian shield of various formation times and types are characterized by the geochemical similarity to those in different regions of the world with the sources associated to mantle plumes. This similarity might be caused by the formation of the mantle carbonated magmas of carbonatite-containing igneous complexes from a mantle source enriched under either mantle metasomatism or plume-lithosphere interaction, with similar mechanisms of formation. The appearance of the formations as such within a wide time interval points to the long-term occurrence of a superplume at the Fennoscandian shield and to permanent activation of the related processes of magma formation.
DS201502-0097
2015
Sharapov, V., Sorokin, K., Perepechko, Y.Dynamics of mantle rock metasomatic transformation in permeable lithospheric zones beneath Siberian craton.Economic Geology Research Institute 2015, Vol. 17,, # 2153, 1p. AbstractRussiaGeothermometry
DS201507-0334
2015
Sharapov, V.N., Chudnenko, K.V., Tomilenko, A.A.The physicochemical dynamics of carbonatization of the rocks of lithospheric mantle beneath the Siberian Platform.Russian Geology and Geophysics, Vol. 56, pp. 696-708.RussiaCarbonatite
DS201502-0098
2015
Sharkov, E.Petrological processes in mantle plume heads: evidence from study of mantle xenoliths in the late Cenozoic alkali Fe-Ti basalts in western Syria.Economic Geology Research Institute 2015, Vol. 17,, # 2144, 1p. AbstractAfrica, SyriaMagmatism
DS201504-0216
2015
Sharkov, E.V., Bogatikov, O.A.Roots of magmatic systems in the large continental igneous Provinces.Doklady Earth Sciences, Vol. 460, 2, pp. 154-158.Europe, SyriaMantle xenoliths
DS201502-0099
2014
Sharygin, I.S.Accessory minerals from shared lherzolites in the Udachnaya-East kimberlitic pipe ( Yakutia): origin and petrogenetic meaning. IN RUSSIANThesis, Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciemces, Novosibirsk, 248p. Available IN RUSSIANRussiaDeposit - Udachnaya-East
DS201509-0427
2015
Shatsky, V.S., Skuzovatov, S.Yu., Ragozin, A.L., Sobolev, N.V.Mobility of elements in a continental subduction zone: evidence from the UHP metamorphic complex of the Kokchetav massif.Russian Geology and Geophysics, Vol. 56, pp. 1016-1034.RussiaKokchetav massif

Abstract: We studied clastics of high-alumina garnet-kyanite-mica schists and garnet-kyanite-quartz granofelses, including diamond-bearing ones, found in the eluvial sediments near Lake Barchi. In contents of major elements the studied rocks correspond to argillaceous shales. The garnet-kyanite-quartz granofelses are poorer in K (0.49-1.35 wt.% K2O) than the garnet-kyanite-mica schists (4.9-2.2 wt.% K2O) but have the same contents of other major components. The REE patterns of most of the garnet-kyanite-phengite schists are similar to those of the Post-Archean Australian Shale (PAAS) (xLa/Yb = 13). All garnet-kyanite-quartz rocks are much stronger depleted in LREE (xLa/Yb = 1.4) and other incompatible elements. Our studies show that allanite and monazite are the main concentrators of LREE and Th in the garnet-kyanite-phengite rocks of the Barchi site. Monazite, occurring as inclusions in garnet, contains not only LREE but also Th, U, and Pb. Rutile of the nondepleted rocks is enriched in Fe and Nb impurities only. The garnet-kyanite-quartz granofelses bear rutile, apatite, and xenotime as accessory phases. Rutile of the depleted rocks shows wide variations in contents of Nb, Ta, and V impurities. In places, the contents of Nb and Ta reach 10.5 and 2.3 wt.%, respectively. The rutile decomposes into rutile with Nb (1.4 wt.%) and Fe (0.87 wt.%) impurities and titanium oxide rich in Fe (6.61 wt.%), Nb (up to 20.8 wt.%), and Ta (up to 2.81%) impurities. Based on the measured contents of incompatible elements in differently depleted high-alumina rocks, the following series of element mobility during UHP metamorphism has been established: Th > Ce > La > Pr > Nd > K > Ba > Rb > Cs > Sm > Eu. The contents of U, P, and Zr in the depleted rocks are similar to those in the nondepleted rocks. The studies have shown that metapelites subducted to the depths with diamond stability conditions can be depleted to different degrees. This might be either due to their exhumation from different depths of the subduction zone or to the presence of an external source of water controlling the temperature of dissolution of phengite and the formation of supercritical fluid/melt.
DS201507-0335
2015
Shatsky, V.S., Zedgenizov, D.A., Ragozin, A.L., Kalinina, V.V.Diamondiferous subcontinental lithospheric mantle of the northeastern Siberian Craton: evidence from mineral inclusions in alluvial diamonds. Kapchan Fold Belt Olenek ProvinceGondwana Research, Vol. 28, 1, pp. 106-120.RussiaDiamond - inclusions
DS201502-0100
2015
Shchukina, E., Agashev, A., Pokhilenko, N.Multistage metasomatism in lithospheric mantle beneath V. Grib pipe ( Arkhangelsk Diamondiferous province, Russia): evidence from REE patterns in garnet xenocrysts.Economic Geology Research Institute 2015, Vol. 17,, # 1940, 1p. AbstractRussia, Kola Peninsula, ArchangelDeposit - Grib
DS201507-0336
2015
Shchukina, E.V., Agashev, A.M., Golovin, N.N., Pokhilenko, N.P.Equigranualr eclogites from the V. Grib kimberlite pipe: evidence for Paleoproterozoic subduction on the territory of the Arkangelsk Diamondiferous province.Doklady Earth Sciences, Vol. 462, 1, pp. 497-501.Russia, Archangel, Kola PeninsulaDeposit - Grib
DS201502-0101
2015
Shertl, H.P., Neuser, R.D., Logvinova, A.M., Wirth, R., Sobolev, N.V.Cathodluminescence microscopy of the Kokchetav ultra high pressure calcsilicate rocks: what can we learn from silicates, carbon hosting minerals and diamond?Russian Geology and Geophysics, Vol. 56, 1-2, pp. 100-112.Russia, KazakhstanKokchetav massif
DS201506-0295
2015
Shigley, J.E., Breeding, C.M.Visible absorption spectra of colored diamonds.Gems & Gemology, Vol. 51, 1, pp. 41-43.TechnologyColoured diamonds
DS201512-1967
2015
Shives, R.B.K.Using gamma ray spectrometry to find rare metals.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov. 13-14, pp. 199-210.TechnologyRare earths

Abstract: For decades, gamma ray spectrometry has been used worldwide to map rocks and locate mineralization in diverse geological settings (Shives et al., 1997). The method is particularly well suited to rare metal and REE (rare earth element) exploration because primary host rocks are enriched in incompatible elements known as LILE (large-ion lithophile elements K, Rb, Cs, Sr, Ba) and HSFE (high fi eld strength elements Zr, Nb, Hf, REEs, Th, U and Ta). As a result, the ores of REEs are commonly radioactive because host rocks, orebearing minerals, or associated accessory minerals may contain trace to anomalous concentrations of radioactive elements K, U and Th. These radioactive elements provide a useful and direct exploration vectors. Gamma ray data are often collected simultaneously with magnetic, electromagnetic, and gravity data in multisensor surveys. The objective of this extended abstract is to emphasize the importance of gamma ray spectrometry as a primary exploration tool for rare metal deposits. Case histories presented herein illustrate radioactive element and magnetic signatures associated with diverse rare metal deposit types in different geological settings. Canadian examples include: Cantley, Quebec (Quinnville and Templeton carbonatites); Oka, Quebec (carbonatite); Bancroft, Ontario (pegmatites); Allan Lake, Ontario (a blind carbonatite discovery); Nechalacho, Northwest Territories (previously called Thor Lake; altered ultra-alkaline layered complex); Strange Lake, Quebec (peralkaline granite, pegmatite); and one each from British Columbia and Labrador. Also presented are examples from Greenland, Norway, and Mozambique.
DS201503-0174
2015
Shor, R.Rough diamond auctions: sweeping changes in pricing and distribution.Gems & Gemology, Vol. 50, 4, winter 2014, 18p.GlobalDiamond production
DS201512-1968
2015
Shor, R., Weldon, R., Janse, A.J.A., Breeding, C.M., Shirey, S.B.Diamonds from the Letseng mine. Explores the history, geology, and current production of this unique source of large diamonds. Letseng La TeraeGems & Gemology, Vol. 51, 3, pp. 280-299.Africa, LesothoDeposit - Letseng
DC201501-1687
2014
Shore Gold Inc.Shore Gold Inc. issued shares of Wescan Gold fields Inc. Shore Gold Inc., Dec. 4, 1p.Canada, SaskatchewanNews item - press release
DC201501-1688
2014
Shore Gold Inc.Star-Orion South diamond project positive environmental decision from federal minister of environment.Shore Gold Inc., Dec. 3, 1p.Canada, SaskatchewanNews item - press release
DC201502-1689
2014
Shore Gold Inc.Shore Gold announces closing of bought deal private placement. $ 5 million.Shore Gold Inc., Dec. 30, 1p.Canada, SaskatchewanNews item - press release
DC201505-1690
2015
Shore Gold Inc.Announces year end results. Environmental assessment process and NI 43-101 and private placement $ 5.5 m.Shore Gold Inc., Mar. 26, 8p.Canada, SaskatchewanNews item - press release
DC201506-1691
2015
Shore Gold Inc.Shore Gold Inc. announces first quarter results.Shore Gold Inc., May 6, 3p.Canada, SaskatchewanNews item - press release
DC201509-1692
2015
Shore Gold Inc.Announces second quarter results. Completion of LDD on Orion South kimberlite; private placement.Shore Gold Inc., Aug. 13, 3p.Canada, SaskatchewanNews item - press release
DC201510-2366
2015
Shore Gold Inc.Star-Orion South diamond drilling project Orion South large diameter drilling diamond results including 3.25, 1.15, 1.09 and 1.04 carat stones.Shore Gold Inc., Sept. 2, 4p.Canada, SaskatchewanNews item - press release
DC201511-2405
2015
Shore Gold Inc.Star-Orion South diamond project diamond prices updated for revised mineral resource estimate.Shore Gold Inc., Oct. 21, 4p.Canada, SaskatchewanNews item - press release
DC201512-2455
2015
Shore Gold Inc.Star-Orion South diamond project revised mineral resource estimate Star indicated: 28.2 Mct; Orion South indicated: 27.1 Mct.Shore Gold Inc., Nov. 9, 3p.Canada, SaskatchewanNews item - press release
DC201512-2456
2015
Shore Gold Inc.Shore Gold Inc. announces third quarter results … revised mineral resources; updated valuation of diamond parcels; drilling results Orion South. Shore Gold Inc., Nov. 12, 3p.Canada, SaskatchewanNews item - press release
DS201504-0217
2015
Shu, Q., Brey, G.P.Ancient mantle metsomatism recorded in subcalcic garnet xenocrysts: temporal links between mantle metasomatism, diamond growth and crustal tectonomagmatism.Earth and Planetary Science Letters, Vol. 418, pp. 27-39.MantleMetasomatism
DS201512-1969
2015
Simandl, G.J.Carbonatites and related exploration targets.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov. 13-14, pp. 31-38.GlobalCarbonatite

Abstract: Mineralized carbonatite systems are multi-commodity, highly sought after, but poorly understood exploration targets (Mariano, 1989a, b; Pell, 1996; Birkett and Simandl, 1999). They are the main sources of niobium and rare earth elements (REE), which are considered critical metals for some key economic sectors (European Commission, 2014), and have become popular exploration targets for junior mining companies worldwide. Carbonatites also contribute to our understanding of the Earth’s mantle (e.g., Bell and Tilton, 2001, 2002). Herein, we discuss the defi nition and classifi cation of carbonatites; summarize information pertinent for carbonatite exploration such as tectonic setting, shape, geophysical signature, associated rocks, alteration, and temporal distribution; and highlight the multi-commodity aspect of carbonatiterelated exploration targets and mineral prospectivity. 2. Defi nition and classifi cation Carbonatites are defi ned by the International Union of Geological Sciences (IUGS) as igneous rocks containing more than 50% modal primary carbonates (Le Maitre, 2002). Depending on the predominant carbonate mineral, a carbonatite is referred to as a ‘calcite carbonatite’ (sövite), ‘dolomite carbonatite’ (beforsite) or ‘ankerite carbonatite’. If more than one carbonate mineral is present, the carbonates are named in order of increasing modal concentrations, for example a ‘calcite-dolomite carbonatite’ is composed predominately of dolomite. If non-essential minerals (e.g., biotite) are present, this can be refl ected in the name as ‘biotite-calcite carbonatite’. Where the modal classifi cation cannot be applied, the IUGS chemical classifi cation is used (Fig. 1). This classifi cation subdivides carbonatites into calciocarbonatites, magnesiocarbonatites, and ferrocarbonatites. For calciocarbonatites, the ratio of CaO/(CaO+MgO+FeO +Fe2O3+MnO) is greater than 0.8. The remaining carbonatites are subdivided (based on wt.% ratios) into magnesiocarbonatite [MgO > (FeO+Fe2O3+MnO)] and ferrocarbonatite [MgO < (FeO+Fe2O3+MnO)] (Woolley and Kempe, 1989; Le Maitre, 2002). If the SiO2 content of the rock exceeds 20%, the rock is referred to as silicocarbonatite. When the IUGS chemical classifi cation is used, care should be taken to ensure that magnetite and hematite-rich calciocarbonates or magnesiocarbonatites are not erroneously classifi ed as ferrocarbonatites (Gittins and Harmer, 1997). A refi nement to the IUGS chemical classifi cation based on molar proportions (Gittins and Harmer, 1997), introduced ‘ferrugineous’ carbonatites (Fig. 2). The boundary separating calciocarbonatites from magnesiocarbonatites and ‘ferrugineous’ carbonatites is set at 0.75, above which carbonatites contain more than 50% calcite on a molar basis. Although not universally accepted, Gittins and Harmer’s classifi cation is commonly used in studies of carbonatitehosted ore deposits. A mineralogical-genetic classifi cation of carbonatites was proposed by Mitchell (2005). His paper points to pitfalls of the IUGS classifi cation and subdivides carbonatites into ‘primary carbonatites’ and ‘carbothermal residua’. The introduction of the term ‘carbothermal residua’ is signifi cant as it alerts mantle specialists to fundamental processes involved in the formation of many carbonatite-related deposits, and reduces rifts between camps of ore deposit geologists, petrologists, and mantle specialists. From the exploration
DS201512-1970
2015
Simandl, G.J., Akam, C., Paradis, S.Selected critical materials: uses, markets, and resources.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov 13-14 2015, pp. 1-4.GlobalStrategic materials
DS201501-0032
2014
Simonov, V.A., Prikhodko, V.S., Kovyazin, S.V., Kotlyarov, A.V.Petrogenesis of meymechites of Sikhote Alin inferred from melt inclusions.Russian Journal of Pacific Geology, Vol. 8, 6, pp. 423-442.RussiaMeymechites
DS201504-0218
2015
Singh, A., Singh, C., Kennett, B.L.N.A review of crust and upper mantle structure beneath the Indian subcontinent.Tectonophysics, Vol. 644-645, pp. 1-21.IndiaGeophysics - seismics, geothermometry
DS201511-1880
2015
Singh, A.P., Kumar, N., Zeyen, H.Three dimensional lithospheric mapping of the eastern Indian Shield: a multi-parametric inversion approach.Tectonophysics, Vol. 665, pp. 164-176.IndiaGeophysics - seismics

Abstract: We analyzed satellite gravity and geoid anomaly and topography data to determine the 3D lithospheric density structure of the Singhbhum Protocontinent. Our density model shows that distinct vertical density heterogeneities exist throughout the lithosphere beneath the Singhbhum Protocontinent. The crustal structure identified includes a lateral average crustal density variation from 2800 to 2890 kg/m3 as well as a relatively flat Moho at 35-40 km depth in Singhbhum Protocontinent and Bastar Craton. A similar Moho depth range is found for the Mahanadi, Damodar, and Bengal basins. In the northern part of the area, Moho undulates between more than 40 km under the confluence of Mahanadi-Damodar Gondwana basins and the Ganga foreland basin, and 36-32 km under the Eastern Ghats Mobile belt and finally reaches 24 km in the Bay of Bengal. The lithosphere-asthenosphere boundary (LAB) across the Singhbhum Protocontinent is at a depth of about 130-140 km. In the regions of Bastar Craton and Bengal Basin, the LAB dips to about 155 ± 5 km depth. The confluence of Mahanadi and Damodar Gondwana basins toward the north-west and the foreland Ganga Basin toward the north are characterized by a deeper LAB lying at a depth of over 170 and 200 km, respectively. In the Bay of Bengal, the LAB is at a shallower depth of about 100-130 km except over the 85 0E ridge (150 km), and off the Kolkata coast (155 km). Significant density variation as well as an almost flat crust-mantle boundary indicates the effect of significant crustal reworking. The thin (135-140 km) lithosphere provides compelling evidence of lithospheric modification in the Singhbhum Protocontinent. Similarities between the lithospheric structures of the Singhbhum Craton, Chhotanagpur Gneiss Complex, and Northern Singhbhum Mobile Belt confirm that the repeated thermal perturbation controlled continental lithospheric modification in the Singhbhum Protocontinent.
DS201506-0296
2015
Singh, SlabunovThe central Bundelk hand Archean greenstone complex, Bundlekhand Craton, central India: geology, composition and geochronology of supracrustal rocks.International Geology Review, Vol. 57, 11-12, pp. 1349-1364.IndiaCraton
DS201511-1881
2014
Sivovolenko, S., Shelementiev, Y., Holloway, G., Mistry, J., Serov, R., Zhulin, S., Zipa, K.How diamond performance attritbutes: brilliance, scintillation and fire depend on human vision features.Australian Gemmologist, Vol. 25, 3, July-Sept. pp.TechnologyDiamond features

Abstract: This study describes how visual properties determine the perception of a diamond’s appearance and its performance attributes of brilliance, scintillation and fire, and how these influence beauty. Further articles will describe other parts of our cut study project. This research enables the development of methods and instruments for diamond performance analyses, shifting from current diamond cut rejection based tools, to diamond performance scoring systems, and the introduction of a new consumer language for communication between diamond buyers and sellers. The proposed Performance Scoring System is consumer friendly and can be used to design and manufacture new diamond cuts with improved optical appearance.
DS201502-0102
2015
Skuzovatov, S.Yu., Zedgenizov, D.A., Rakevich, A.L., Shatsky, V.S., Martynovich, E.F.Multiple growth events in diamonds with cloudy Micro inclusions from the Mir kimberlite pipe: evidence from the systematics of optically active defects.Russian Geology and Geophysics, Vol. 56, 1, pp. 330-343.RussiaDeposit - Mir
DS201503-0175
2015
Smillie, I.Radical collaboration: 10 years later. How a multi-stakeholder meeting lead to the creation and success of the diamond development initiative.ddiglobal.org, Jan. 27, 3p.GlobalCSR
DS201503-0176
2015
Smillie, I.The Tiffany & Co. foundation supports miner's registration project in DRC.ddiglobal.org, Jan. 6, 1p.Africa, Democratic Republic of CongoCSR
DS201504-0219
2015
Smith, E.M., Kopylova, M.G., Frezzotti, M.L., Afanasiev, V.P.Fluid inclusions in the Ebelyakh diamonds: evidence of CO2 liberation in eclogite and the effect of H2O on diamond habit.Lithos, Vol. 216-217, pp. 106-117.RussiaDeposit - Ebelyakh River
DS201510-1804
2015
Smith, L.j.D., Ptacek, C.J., Blowes, D.W., Groza, L.G., Moncur, M.C.Perchlorate in lake water from an operating mine. DiavikEnvironmental Science and Technology, Vol. 49, 13, pp. 7589-7596.Canada, Northwest TerritoriesDeposit - Diavik

Abstract: Mining-related perchlorate [ClO4(-)] in the receiving environment was investigated at the operating open-pit and underground Diavik diamond mine, Northwest Territories, Canada. Samples were collected over four years and ClO4(-) was measured in various mine waters, the 560 km(2) ultraoligotrophic receiving lake, background lake water and snow distal from the mine. Groundwaters from the underground mine had variable ClO4(-) concentrations, up to 157 ?g L(-1), and were typically an order of magnitude higher than concentrations in combined mine waters prior to treatment and discharge to the lake. Snow core samples had a mean ClO4(-) concentration of 0.021 ?g L(-1) (n=16). Snow and lake water Cl(-)/ClO4(-) ratios suggest evapoconcentration was not an important process affecting lake ClO4(-) concentrations. The multiyear mean ClO4(-) concentrations in the lake were 0.30 ?g L(-1) (n = 114) in open water and 0.24 ?g L(-1) (n = 107) under ice, much below the Canadian drinking water guideline of 6 ?g L(-1). Receiving lake concentrations of ClO4(-) generally decreased year over year and ClO4(-) was not likely [biogeo]chemically attenuated within the receiving lake. The discharge of treated mine water was shown to contribute mining-related ClO4(-) to the lake and the low concentrations after 12 years of mining were attributed to the large volume of the receiving lake.
DS201504-0220
2015
SNL Metals & MiningWorld exploration trends 2015SNL Metals Economics Group, March 3, 11p.GlobalExploration - prices, budgets, arenas
DS201503-0177
2015
So, B-D., Yuen, D.A.Generation of tectonic over-pressure inside subducting oceanic lithosphere involving phase-loop of olivine-wadsleyite transition.Earth and Planetary Science Letters, Vol. 413, March 1, pp. 59-69.MantleSubduction
DS201502-0103
2015
Sobolev, N.V., Dobretsov, N.I., Ohtani, E., Taylor, L.A., Schertl, H-P., Palyanov, Yu.N.Problems related to crystallogenesis and the deep carbon cycle.Russian Geology and Geophysics, Vol. 56, 1-2, pp. 1-12.MantleCarbon cycle
DS201510-1805
2015
Sobolev, N.V., Sobolev, A.V., Tomilenko, A.A., Batanova, V.G., Tolstov, A.V., Logvinova, A.M., Kuzmin, D.V.Unique compositional pecularities of olivine phenocrysts from the post flood basalt Diamondiferous Malokuonapskaya kimberlite pipe, Yakutia.Doklady Earth Sciences, Vol. 463, 2, pp. 828-832.RussiaDeposit - Malokuonapskaya
DS201502-0104
2015
Sobolev, N.V., Sobolev, A.V., Tomilenko, A.A., Kovyazin, S.V., Batanova, V.G., Kuzmin, D.V.Paragenesis and complex zoning of olivine macrocrysts from unaltered kimberlite of the Udachnaya-East pipe, Yakutia: relationship with the kimberlite formation conditions and evolution.Russian Geology and Geophysics, Vol. 56, 1, pp. 260-279.Russia, YakutiaDeposit - Udachnaya-East
DS201510-1806
2015
Sokol, A.G., Khokhryakov, A.F., Palyanov, Yu.N.Composition of primary kimberlite magma: constraints from melting and diamond dissolution experiments.Contributions to Mineralogy and Petrology, Vol. 170, 19p.RussiaDeposit - Udachnaya

Abstract: Experiments are applied to constrain the composition of primary kimberlitic magmas which were in equilibrium with lithospheric peridotite and could resorb the entrained diamond to form typical dissolution features. The experiments are run on samples of a model carbonatite and a melt of the Udachnaya kimberlite at 6.3 GPa and 1400 °C, and at unbuffered or Re-ReO2-buffered oxygen fugacity (1-2 log units above Ni-O). Near-liquidus dry Fe3+-free carbonatitic melt (derived from carbonated harzburgite) is saturated with the Ol-Grt-Opx-Mgs assemblage and is almost inert to diamond. Carbonatitic melts that bear 4.6-6.8 wt% Fe2O3 or 1.5 wt% H2O are in equilibrium only with Mgs ± Ol near the liquidus. Dissolution of diamond by these melts produces surface textures uncommon (corrosion sculptures) or common (negative-oriented trigons, shield-shaped laminae and elongate hillocks) to kimberlitic diamonds. The near-liquidus melt of the Udachnaya kimberlite (Yakutia) with 10-12 wt% H2O is saturated with the Ol-Grt-px assemblage and may result from melting of carbonated garnet-bearing wehrlite. Hydrous kimberlitic melt likewise resorbs diamonds forming typical negative-oriented trigons, shield-shaped laminae and elongate hillocks on their surfaces. Therefore, the melts that could originate in the thermal conditions of subcratonic lithosphere, entrain diamond and dissolve it to produce dissolution features on crystal surfaces, were compositionally close to kimberlite (16-19 wt% SiO2) and rich in H2O. Dry Fe3+-bearing carbonatites with fO2 controlled by the ferric/ferrous equilibrium slightly above the Ni-NiO buffer cannot be diamond carriers.
DS201502-0105
2015
Sokol, A.G., Kruk, A.N.Conditions of kimberlite magma generation: experimental constraints.Russian Geology and Geophysics, Vol. 56, 1, pp. 245-259.MantleKimberlite genesis
DS201509-0428
2015
Sokol, A.G., Kruk, A.N., Chebotarev, D.A., Palyanov, Yu.N., Sobolev, N.V.The composition of garnet as an indicator of the conditions of peridotite-carbonatite interaction in the subcratonic lithosphere ( Experimental data).Doklady Earth Sciences, Vol. 463, 1, pp. 746-750.MantleGarnet, carbonatite

Abstract: The article focuses on the study of composition of garnets of the lherzolitic and harzburgitic parageneses and the conditions of peridotite. As per the study, reconstruction of the conditions of metasomatism of peridotitic sources of kimberlite is possible in the evolution of garnet. It mentions the importance of dry and hydrous carbonatitic melt upon alteration of peridotitic sources of kimberlite as it acted as an another heat source.
DS201512-1971
2015
Solgadi, F., Groulier, P.A, Moukhsil, A., Ohnenstetter, D., Andre-Mayer, A.S., Zeh, A.Nb-Ta-REE mineralization associated with the Crevier alkaline intrusion.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov. 13-14, pp. 69-74.Canada, QuebecAlkalic

Abstract: The Crevier alkaline intrusion is in the Grenville Province, north of the Lac Saint-Jean region of Québec (Fig. 1). It covers ~25 km2 (Bergeron, 1980) and intrudes charnockitic suites in the allochthon belt defi ned by Rivers et al. (1989). This intrusion has a U-Pb zircon age of 957.5 ± 2.9 Ma (Groulier et al., 2014) and is oriented N320°, along the axis of crustal weakness known as the Waswanipi-Saguenay corridor (Bernier and Moorhead, 2000). This corridor is related to the Saguenay graben, which hosts the Saint-Honoré (Niobec) Nb-Ta-REE deposit and Montviel REE deposit. The age of the Saint-Honoré carbonatite was estimated at 584 to 650 Ma (K-Ar whole rock; Vallée and Dubuc, 1970; Boily and Gosselin, 2004). The Montviel intrusion has a U-Pb zircon age of 1894 ± 3.5 Ma (David et al., 2006; Goutier, 2006). These crystallization ages are very different and cannot be related to a single event for the injection of alkaline intrusions. As mapped by Bergeron (1980), the Crevier alkaline intrusion is broadly composed of syenite and carbonatite rocks (Fig. 2). The Nb- Ta mineralization consists of pyrochlore hosted by a nepheline syenite dike swarm in the centre of the intrusion. The highest REE concentrations, up to 729 ppm La and 1465 ppm Ce, are at the edge of the Crevier alkaline intrusion (Niotaz sud showing; Fig. 2).
DS201502-0106
2015
Sotnikova, I., Vladykin, N.Genesis of rare metal pegmatites and alkaline fluorite rocks of Burpala Massif, northern Baikal folded zone.Economic Geology Research Institute 2015, Vol. 17,, # 3020, 1p. AbstractRussiaCarbonatite
DS201504-0221
2015
Souriau, A.Presumption of large scale heterogeneity at the top of the outer core basal layer.Earth and Planetary Science Letters, Vol. 415, April pp. 175-182.MantleCore
DM201502-1336
2015
Spence, R.Diamond mines of the world: 10 top ones ( three or four lines for the layman) on each.Sprottglobal.com, Jan. 2p.GlobalNews item - list of big mines
DS201502-0107
2015
Spetsius, Z.V., Bogush, I.N., Kovalchuk, O.E.FTIR mapping of diamond plates of eclogitic and peridotitic xenoliths from Nyurbinskaya pipe, Yakutia: genetic implications.Russian Geology and Geophysics, Vol. 56, 1, pp. 344-353.RussiaDeposit - Nyurbinskaya
DS201510-1807
2014
Spetsius, Z.V., Polyanichko, V.V., Xarlamova, E.I., Tarskix, O.V., Ivanov, A.S.Geology, petrography and mineralogy of the Zarya pipe kimberlites.Deep-seated magmatism, its sources and plumes, Proceedings of XIII International Workshop held 2014., Vol. 2014, pp. 160-177.RussiaDeposit - Zarya
DS201502-0108
2015
Spiegel, S.J.Contested diamond certification: reconfiguring global and national interests in Zimbabwe's Marange fields.Geoforum, Vol. 59, Feb. pp. 258-267.Africa, ZimbabweConflict Diamonds CSR
DS201504-0222
2015
Spiegl, T.C., Paeth, H., Frimmel, H.E.Evaluating key parameters for the initiation of a Neoproterozoic Snowball Earth with a single Earth System Model of intermediate complexity.Earth and Planetary Science Letters, Vol. 415, April pp. 100-110.MantleModel
DS201509-0429
2015
Spivak, A., Solopova, N., Dubrovinsky, L., Litvin, Y.Melting relations of multicompnent carbonate MgCO3-FeCO3-CaCO3-Na2CO3 system at 12-26 Gpa: application to deeper mantle diamond formation.Physics and Chemistry of Minerals, DOI 10.1007/ s00269-015-0765-6MantleMelting

Abstract: Carbonatic components of parental melts of the deeper mantle diamonds are inferred from their primary inclusions of (Mg, Fe, Ca, Na)-carbonate minerals trapped at PT conditions of the Earth’s transition zone and lower mantle. PT phase diagrams of MgCO3-FeCO3-CaCO3-Na2CO3 system and its ternary MgCO3-FeCO3-Na2CO3 boundary join were studied at pressures between 12 and 24 GPa and high temperatures. Experimental data point to eutectic solidus phase relations and indicate liquidus boundaries for completely miscible (Mg, Fe, Ca, Na)- and (Mg, Fe, Ca)-carbonate melts. PT fields for partial carbonate melts associated with (Mg, Fe)-, (Ca, Fe, Na)-, and (Na2Ca, Na2Fe)-carbonate solid solution phases are determined. Effective nucleation and mass crystallization of deeper mantle diamonds are realized in multicomponent (Mg, Fe, Ca, Na)-carbonatite-carbon melts at 18 and 26 GPa. The multicomponent carbonate systems were melted at temperatures that are lower than the geothermal ones. This gives an evidence for generation of diamond-parental carbonatite melts and formation of diamonds at the PT conditions of transition zone and lower mantle.
DS201510-1808
2015
Spivak, A.V.Genesis of superdeep diamond and inclusions from the Earth's lower mantle ( experimental research). IN RUSSIANInstitute of Experimental Mineralogy, Russian Academy of Sciences, Chernogolova ( Moscow) IN RUSSIAN, 216p. Available pdfMantleDiamond inclusions
DS201511-1882
2015
Spivak, A.V., Solopova, N.A., Dubrovinsky, L.S., Litvin, Yu.A.The system MgCO3-FeCO3-CaCO3-Na2CO3 at 12-23 Gpa: phase relations and significance for the genesis of ultradeep diamonds.Doklady Earth Sciences, Vol. 464, 1, pp. 946-950.MantleDiamond genesis

Abstract: Physical-chemical experimental studies at 12-23 GPa of phase relationships within four-members carbonate system MgCO3-FeCO3-CaCO3-Na2CO3 and its marginal system MgCO3-FeCO3-Na2CO3 were carried out. The systems are quite representative for a set of carbonate phases from inclusions in diamonds within transitional zone and lower mantle. PT-phase diagrams of multicomponent carbonate systems are suggested. PT parameters of boundaries of their eutectic melting (solidus), complete melting (liquids) are established. These boundaries define area of partial melting. Carbonate melts are stable, completely mixable, and effective solvents of elemental carbon thus defining the possibility of ultra-deep diamonds generation.
DS201511-1883
2015
Spivak, A.V., Solopova, N.A., Dubrovinsky, L.S., Litvin, Yu.A.Melting relations of multicomponent carbonate MgCOs-FeCO3-CaCO3-Na2COs system at 12-26 Gpa: application to deeper mantle diamond formation.Physics and chemistry of Minerals, Vol. 42, 10, pp. 817-824.TechnologyDiamond genesis - experimental
DS201509-0430
2015
Srivastava, R.K., Gautam, G.C.Geochemistry and petrogenesis of Paleo-Mesoproterozoic mafic dyke swarms from northern Bastar craton, central India: geodynamic implications in reference to Columbia supercontinent.Gondwana Research, Vol. 28, pp. 1061-1078.IndiaDike swarms

Abstract: Field setting, petrography, geochemistry and available radiometric ages of Proterozoic mafic dykes from the northern Bastar craton have helped to identify four sets of mafic dykes; two Paleoproterozoic [viz. NW-SE North Bastar dykes (NBD) and ENE-WSW Dongargarh-Chhura dykes (DCD)] and two Mesoproterozoic [viz. 1.42 Ga ENE-WSW Bandalimal dykes (BDD) and 1.44 Ga N-S Lakhna dykes (LKD)]. Their petrographic and geochemical characteristics are very distinct and suggest their derivation from different mantle melts. Chemistry of all the four sets suggests different petrogenetic histories and samples of each distinct set are co-genetic nature. The NBD, the DCD and the BDD samples are sub-alkaline tholeiitic in nature, whereas the LKD samples show alkaline nature. Very distinct REE patterns are observed for all the four sets again suggesting their different petrogenetic histories. Geochemical comparison between the studied samples and mafic dyke samples of southern and central parts of the Bastar craton suggests very different picture for the northern Bastar craton. Only one set of northern Bastar dykes, i.e. the NBD, matches with BD1 dykes; no other dyke sets match with any of the dyke swarms identified in southern and central Bastar craton. Geochemically it is not straightforward to confirm crustal contamination, however, on the other hand, possibility of crustal contamination cannot be ruled out completely. A petrogenetic model based on trace element data suggests that all the four sets are derived from different mantle melts. The NBD and the DCD are probably generated within spinel stability field, whereas the BDD and the LKD may be derived from melts generated within garnet stability field. Available geological and geochemical data support the emplacement of studied dykes in a stable continental rift tectonic setting, however earlier intrusions have chemistry similar to N-MORB. The available geological, geochemical and geochronological data on the four indentified sets of mafic dykes from the northern Bastar craton indicate their relation to the assembly and break-up of Columbia supercontinent.
DS201504-0223
2015
Stachel, T., Luth, R.W.Diamond formation - where, when and how?Lithos, Vol. 220-223, pp. 200-220.MantleDiamond inclusion, redox, geobarometry
DS201512-1972
2015
Stachel, T., Luth, R.W.Diamond formation in Earth's mantle.43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 98.MantleDiamond genesis

Abstract: Studies of mineral inclusions in diamond have conclusively established that the principal diamond substrates in Earth's mantle are peridotitic (about 2/3) and eclogitic (about 1/3) domains located at 140-200 km depth in the subcratonic lithosphere. There, the formation of the dominant harzburgitic diamond association generally occurred under subsolidus (melt-absent) conditions. In eclogitic and lherzolitic substrates, however, diamond grew in the presence of a melt, with relatively rare exceptions relating to formation from strongly reducing fluids or at relatively low pressure (<50 kbar) and temperature (<1050°C). Complex internal growth structures indicate that in many instances, diamond formation did not occur in a single short lived event. The observed close agreement of radiometric ages involving different isotope systems and inclusion minerals for diamonds from individual occurrences, however, cannot be coincidental and implies that the temporal extent of individual diamond growth events is contained within the uncertainty of the age dates. Diamond formed through most of Earth's history, from the Paleoarchean to at least the Mesozoic. Diamond forming episodes occur on regional to global scales in response to tectonothermal events such as suturing, subduction and plume impact. Individual diamond forming episodes may be associated with particular substrates, with harzburgitic paragenesis diamonds generally yielding Paleoarchean (3.6-3.2 Ga) ages and lherzolitic paragenesis diamonds forming mostly in the Paleoproterozoic at ~2 Ga. Peridotitic diamond growth, however, continued through Earth's history, with the youngest age date being ~90 Ma. Formation of diamonds hosted by eclogite is documented from the Mesoarchean to the Neoproterozoic (2.9 and 0.6 Ga) and may well continue up to the present. Multiple lines of evidence suggest that formation of fibrous diamonds and diamond coats often is penecontemporaneous to kimberlite magmatism and hence, for the Central Slave, may even extent into the Tertiary. When it comes to the actual process(es) driving the precipitation of diamond, our knowledge is much less complete. Diamond grows during the infiltration of carbon-bearing fluids or melts into a suitable substrate. But what exactly is the diamond forming reaction that occurs there? The conventional view that redox reactions between percolating fluids/melts and wall rocks are nature's diamond recipe is inconsistent with both the low redox capacity of lithospheric mantle and the occurrence of large diamonds. Based on thermodynamic modeling, we instead propose that isochemical cooling or ascent of carbon-bearing fluids is a key mechanism of diamond formation. It operates particularly efficiently in chemically depleted mantle rocks (harzburgite), where a high melting temperature precludes dilution of the infiltrating fluid (see above), thereby explaining the long observed close association between diamond and harzburgitic garnet.
DS201502-0109
2014
Stacy, J., Stacey, A.Perceptions of the impact of board members' individual perspectives on the social and environmental performance of companies. ( Based on SA and not junior companies).Journal of the South African Institute of Mining and Metallurgy, Vol. 114, Nov. pp. 957-969.Africa, South AfricaCSR
DS201503-0179
2015
Stagno, V., Frost, D.J., McCammon, C.A., Mohseni, H., Fei, Y.The oxygen fugacity at which graphite or diamond forms from carbonate bearing melts in eclogitic rocks.Contributions to Mineralogy and Petrology, Vol. 169, 18p.TechnologyRedox, carbonatite, geobarometry
DS201505-0245
2015
Stein, M.Alkali basalts from the Golan and Galilee - signal from the early differentiation of the Earth mantle.Israel Geological Society, Abstracts 1p.Europe, Arabia, Nubian shieldMetasomatism
DC201501-1693
2014
Stellar Diamonds plc.Significant increase in resource and diamond grade at Tongo kimberlite dyke project.Stellar Diamonds plc., Nov. 28, 4p.Africa, Sierra LeoneNews item - press release
DC201501-1694
2014
Stellar Diamonds plc.First diamond export from trial mining at Baolue kimberlite, Ghana.Stellar Diamonds plc., Dec. 4, 3p.Africa, GhanaNews item - press release
DC201501-1695
2014
Stellar Diamonds plc.Positive study for acceleration of cash flows from surface mining at Tongo project Sierra Leone.Stellar Diamonds plc., Dec. 3, 5p.Africa, Sierra LeoneNews item - press release
DC201501-1696
2014
Stellar Diamonds plc.Loan facility with YA Global Master SPV Ltd.Stellar Diamonds plc., Dec. 9, 3p.Africa, GuineaNews item - press release
DC201502-1697
2015
Stellar Diamonds Plc.Stellar Diamonds says Guinea trial mining on track: opts for larger Antwerp auction. BaouleStellar Diamonds Plc., Jan. 6, 1p.Africa, GuineaNews item - press release
DC201502-1698
2015
Stellar Diamonds Plc.Issue of equity… Fundraising…. For Baoule.Stellar Diamonds Plc., Jan. 22, 2p.Africa, GuineaNews item - press release
DC201503-1699
2015
Stellar Diamonds plc.Stellar Diamonds plc. Annual report and update. Bauole pipe project.Stellar Diamonds Plc., Feb. 18, 1p.Africa, GuineaNews item - press release
DC201504-1700
2015
Stellar Diamonds Plc.Diamond tender 6,031 carats. BaouleStellar Diamonds plc., Feb. 27, 1p.Africa, GuineaNews item - press release
DC201504-1701
2015
Stellar Diamonds plc.First diamond sales and revenues. 4,414 carats for $ US 417, 122. BaouleStellar Diamonds plc., Mar. 24, 1p.Africa, GuineaNews item - press release
DC201505-1702
2015
Stellar Diamonds plc.Interim results for the six months to 31 December 2014. Baoule, TongoStellar Diamonds plc., Mar. 27, 3p.Africa, Guinea, Sierra LeoneNews item - press release
DC201505-1703
2015
Stellar Diamonds plc.Interim results on Baoule, Tongo, finances.Stellar Diamonds plc., Mar. 27, 13p.Africa, Guinea, Sierra LeoneNews item - press release
DC201505-1704
2015
Stellar Diamonds plc.Application for mining licence at Tongo kimberlite project, Sierra Leone.Stellar Diamonds plc., Apr. 1, 5p.Africa, Sierra LeoneNews item - press release
DC201505-1705
2015
Stellar Diamonds plc.First 5000 carats achieved from trial mining at Baoule kimberlite, Guinea.Stellar Diamonds plc., Apr. 20, 4p.Africa, GuineaNews item - press release
DC201506-1706
2015
Stellar Diamonds plc.Baoule diamond sale 4,439 carats to take place in Dubai and Antwerp.Stellar Diamonds plc., May 7, 1p.Africa, GuineaNews item - press release
DC201506-1707
2015
Stellar Diamonds plc.Strong revenues from Baoule diamond auction.Stellar Diamonds plc., May 28, 1p.Africa, GuineaNews item - press release
DC201507-1708
2015
Stellar Diamonds plc.Strong revenues from Baoule diamond auction.Stellar Diamonds plc., May 28, 2p.Africa, GuineaNews item - press release
DC201509-1709
2015
Stellar Diamonds plc.Issue of convertible loan note , warrants and proposed capital re-organization, director's loan. Baoule and Tongo Dyke-1.Stellar Diamonds plc., Aug. 14, 1p.Africa, GuineaNews item - press release
DC201509-1710
2015
Stellar Diamonds plc.Positive PEA on Tongo project and mining licence application, Sierra Leone.Stellar Diamonds plc., Aug. 24, 3p.Africa, Sierra LeoneNews item - press release
DC201512-2457
2015
Stellar Diamonds plc.Capital reorganization, funding update for Boule.Stellar Diamonds plc., Nov. 19, 2p.Africa, Sierra LeoneNews item - press release
DC201512-2458
2015
Stellar Diamonds plc.Final results and notices of AGM. Baoule, Tongo Dyke-1Stellar Diamonds plc., Nov. 24, 5p.Africa, Sierra LeoneNews item - press release
DC201512-2459
2015
Stellar Diamonds plc.Submission of Tongo mining licence application and environmental impact assessment.Stellar Diamonds plc., Nov. 27, 1p.Africa, Sierra LeoneNews item - press release
DS201507-0337
2015
Steyn, M.A disgrace to the profession. The World's scientists, in their own words, on Michael E. Mann, his Hockey Stick and Their damage to Science. Vol. 1.steynstore.com, Book $ 19.95GlobalClimate change
DS201511-1884
2015
Stocklmayer, V., Stocklmayer, S.A review of diamonds in Zimbabwe - a century on.Australian Gemmologist, Vol. 25, 9, pp. 316-325.Africa, ZimbabweHistory
DM201501-1337
2014
StockwatchCMKK's Turino loses detention appeal. Stockwatch.com, Dec. 3, 1p.United StatesNews item - CMKK
DM201501-2474
2014
StockwatchNorthern Superior seeking JV for Ville Marie play in Quebec. Diamond Fields talking with contractor for dredging areas off coast of Namibia. Grizzly needs to resume work on claims.Stockwatch.com, Nov. 28 2p.Canada, AfricaNews item - Northern Superior, Diamond Fields, Grizzly
DM201503-1338
2015
StockwatchACS Archon sued by Fipke over Ekati legal fees.Stockwatch.com, Feb. 3, 2p.Canada, Northwest TerritoriesNews item - Archon
DM201505-1339
2015
StockwatchArchon, Blussom deny owing Fipke's legal bill.Stockwatch.com, Apr. 1, 1p.Canada, Northwest TerritoriesNews item - press release
DM201505-2475
2015
StockwatchNewstar Securities ( Robert Friedland) exercised options Peregrine Diamonds Ltd.Stockwatch.com, Apr. 8, 1/2p.Canada, NunavutNews item - Peregrine
DM201506-1340
2015
StockwatchCMKM defendant Turino seeks freedom, again.Stockwatch Diamonds & Specialty Minerals, May 21, 2p.United StatesNews item - CMKM
DM201511-2200
2015
StockwatchCMKM Diamonds Inc. defendants moan about jail conditions.Stockwatch.com, Sept. 28, 1p.United StatesNews item - CMKM
DS201512-1973
2015
Stokes, L.Kennady causes a commotion. A visit to the 'exciting' Kennady North project.Diamonds in Canada Magazine, Northern Miner, Nov. pp. 10-13.Canada, Northwest TerritoriesDeposit - Kennady North
DM201506-1341
2015
StonechickyFive yellow diamonds were registered last week at the Crater of Diamonds. Two weighed over a half carat each.Stonechicky, Apr. 20, 1/4p.United States, ArkansasNews item - Crater of Diamonds
DC201501-1713
2014
Stornoway Diamond CorporationStornoway announces second quarter 2015 results.Stornoway Diamond Corporation, Dec. 15, 3p.Canada, QuebecNews item - press release
DC201504-1714
2015
Stornoway Diamond CorporationStornoway commences pre-stripping at Renard -2 Renard -3 open pit.Stornoway Diamond Corporation, Mar. 5, 1/4p.Canada, QuebecNews item - press release
DC201504-1715
2015
Stornoway Diamond CorporationStornoway announces official opening of the "Clarence & Abel Swallow airport.Stornoway Diamond Corporation, Mar. 25, 1p.Canada, QuebecNews item - press release
DC201505-1716
2015
Stornoway Diamond CorporationStornoway announces funding of first tranche of stream financing. $ 80 millionStornoway Diamond Corporation, Mar. 31, 2p.Canada, QuebecNews item - press release
DC201505-1717
2015
Stornoway Diamond CorporationStornoway pours first concrete for the Renard diamond plant.Stornoway Diamond Corporation, Apr. 7, 1p.Canada, QuebecNews item - press release
DC201506-1718
2015
Stornoway Diamond CorporationStornoway announces investment by Blackstone Tactical Opportunities ( equity position) RenardStornoway Diamond Corporation, Apr. 30, 2p.Canada, QuebecNews item - press release
DC201507-1719
2015
Stornoway Diamond CorporationStornoway announces fourth quarter and fiscal year 2015 results. RenardStornoway Diamond Corporation, June 17, 8p.Canada, QuebecNews item - press release
DC201510-2367
2015
Stornoway Diamond CorporationStornoway announces updated Renard mineral resource estimate. Renard 2 21.6 m caratsStornoway Diamond Corporation, Sept. 24, 3p.Canada, QuebecNews item - press release
DC201511-2406
2015
Stornoway Diamond CorporationStornoway announces funding of second tranche of stream financing. RenardStornoway Diamond Corporation, Oct. 1, 3p.Canada, QuebecNews item - press release
DC201511-2407
2015
Stornoway Diamond CorporationStornoway files Renard N!43-101 technical report, includes first estimate of exploration potential at Renard kimberlites.Stornoway Diamond Corporation, Oct. 14, 4p.Canada, QuebecNews item - press release
DC201505-1720
2015
Strike Diamond CorporationStrike Diamond Corp. announces discovery of kimberlite indicator minerals at Sask. Craton properties ( Pikoo district).Strike Diamonds Corporation, Mar. 30, 3p.Canada, SaskatchewanNews item - press release
DC201506-1721
2015
Strike Diamond CorporationStrike Diamond Corp. announces Pikoo property transaction with Wildcat Exploration Ltd.Strike Diamond Corporation, May 14, 1p.Canada, SaskatchewanNews item - press release
DC201508-1722
2015
Strike Diamond CorporationAnnounces regulatory decision. Relief from forest fires near Pikoo.Strike Diamond Corporation, July 20, 1p.Canada, SaskatchewanNews item - press release
DC201509-1723
2015
Strike Diamond CorporationStrike Diamond Corp. terminates proposed transaction with Wildcat Exploration Ltd. Strike Diamond Corporation, Aug. 28, 1p.Canada, SaskatchewanNews item - press release
DC201510-2368
2015
Strike Diamond CorporationStrike Diamond Corp announces commencement of Pikoo airborne survey.Strike Diamond Corporation, Sept. 16, 2p.Canada, SaskatchewanNews item - press release
DC201512-2460
2015
Strike Diamond CorporationProngua Lake project update. Airborne survey.Strike Diamond Corporation, Oct 29, 1p.Canada, SaskatchewanNews item - press release
DC201512-2461
2015
Strike Diamond CorporationAnnounes Pikoo airoborne results. Strike Diamond Corporation, Nov. 17, 1p.Canada, SaskatchewanNews item - press release
DS201502-0110
2014
Sun, J., Zhu, X., Chen, Y., Fang, N., Li, S.Is the Bayan Obo ore deposit a micrite mound? A comparison with the Sailinhudong micrite mound.International Geology Review, Vol. 56, 14, pp. 1720-1731.ChinaCarbonatite
DC201502-1724
2014
Sunergy, Inc.Sunergy and its partners complete cash sale of diamonds in 2014.Sunergy, Inc., Dec. 31, 1p.Africa, Sierra Leone, LiberiaNews item - press release
DC201506-1726
2015
Sunergy, Inc.Sunergy Management visits Sierra Leone and Liberia to consolidate equipment , finalize in country mining relations for 2015, and complete third diamond parcel shipment.Sunergy, Inc., Aprl. 27, 2p.Africa, Sierra Leone, LiberiaNews item - press release
DC201507-1725
2015
Sunergy, Inc.Sunergy has successfully closed the sale of both parcel 2 and 3 as of June 24. Sunergy, Inc., June 25, 1p.Africa, Liberia, Sierra LeoneNews item - press release
DC201506-1727
2015
Sunrise Resources plc.Half yearly highlights Cue.Sunrise Resources plc., May 20, 3p.AustraliaNews item - press release
DC201507-1728
2015
Sunrise Resources plc.Cue (6 ppt slides)Sunrise Resources plc., June 18, 33ppt. AustraliaNews item - Sunrise
DS201502-0111
2015
Sushchevskaya, N., Melanholina, E., Belyatsky, B., Krymsky, R., Migdisova, N.Oceanic magmatic evolution during ocean opening under influence of mantle plume.Economic Geology Research Institute 2015, Vol. 17,, #3059, 1p. AbstractIndiaLamproite
DS201512-1974
2015
Sverjensky, D.A., Huang, F.Diamond formation due to a pH drop during fluid-rock interactions.Nature Communications, Nov. 3, 7p.TechnologyDiamond genesis

Abstract: Diamond formation has typically been attributed to redox reactions during precipitation from fluids or magmas. Either the oxidation of methane or the reduction of carbon dioxide has been suggested, based on simplistic models of deep fluids consisting of mixtures of dissolved neutral gas molecules without consideration of aqueous ions. The role of pH changes associated with water–silicate rock interactions during diamond formation is unknown. Here we show that diamonds could form due to a drop in pH during water–rock interactions. We use a recent theoretical model of deep fluids that includes ions, to show that fluid can react irreversibly with eclogite at 900?°C and 5.0?GPa, generating diamond and secondary minerals due to a decrease in pH at almost constant oxygen fugacity. Overall, our results constitute a new quantitative theory of diamond formation as a consequence of the reaction of deep fluids with the rock types that they encounter during migration. Diamond can form in the deep Earth during water–rock interactions without changes in oxidation state.
DS201512-1975
2015
Szuromi, P.Solar cells. Perovskites go large.Science, Vol. 350, 6263, p. 923.TechnologyPerovskite
DM201506-1342
2015
Tacy LtdThe 2014 diamond pipeline.. Pace of retail growth continues to slide.Diamond Intelligence Briefing, Vol. 30, 855, Apr. 27, pp. 4-11.GlobalNews item - pipeline
DS201501-0033
2014
Takafuma, T.Diamond Shades: Point of View .. Answers to 8 key questions on future of global diamond industry.diamondshades.com, 90p. PdfGlobalOverview
DC201504-1729
2015
Talmora Diamond Inc.Talmora Diamond ennounces extension of warrants to 21 March 2016.Talmora Diamond Inc., Mar. 12, 2p.Canada, Northwest TerritoriesNews item - press release
DS201502-0112
2015
Tamen, J., Nkoumbou, C., Reusser, E., Tchoua, F.Petrology and geochemistry of mantle xenoliths from the Kapsiki Plateau ( Cameroon Volcanic Line): implications for lithospheric upwelling.Journal of African Earth Sciences, Vol. 101, pp. 119-134.Africa, CameroonMetasomatism
DC201501-1730
2014
Tango Mining LimitedTango announces bulk sampling program at Oena project South Africa.Tango Mining Limited, Dec. 1, 3p.Africa, South AfricaNews item - press release
DC201504-1731
2015
Tango Mining LimitedBulk sampling program has commenced at Oena project, South Africa.Tango Mining Limited, Mar. 3, 1p.Africa, South AfricaNews item - press release
DC201508-1732
2015
Tango Mining LimitedOena operational.Tango Mining Limited, July 6, 3p.Africa, South AfricaNews item - press release
DC201508-1733
2015
Tango Mining LimitedTango to acquire BK11 diamond mine, Botswana from Firestone.Tango Mining Limited, July 9, 2p.Africa, BotswanaNews item - press release
DC201509-1734
2015
Tango Mining LimitedOena operational update and diamond sales. Orange River alluvials.Tango Mining Limited, Aug. 5, 1p.Africa, South AfricaNews item - press release
DC201509-1735
2015
Tango Mining LimitedTango annnounces resource estimate for BK11 kimberlite diamond mine, Botswana.Tango Mining Limited, Aug. 24, 3p.Africa, BotswanaNews item - press release
DC201511-2408
2015
Tango Mining LimitedTango announces Oena bulk sampling program to recommence.Tango Mining Limited, Oct. 6, 1p.Africa, South AfricaNews item - press release
DC201511-2409
2015
Tango Mining LimitedTango announces positive NI43-101 PEA for BK11 kimberlite diamond mine, Botswana and updated acquisition terms with Firestone.Tango Mining Limited, Oct. 13, 2p.Africa, BotswanaNews item - press release
DC201511-2410
2015
Tango Mining LimitedBulking up its diamond division. BK11 and OenaHallgarten & Company, Oct. 21, 16p.Africa, Botswana, South AfricaNews item - Tango
DS201512-1976
2016
Tappe, S., Smart, K.A., Stracke, A., Romer, R.L., Prelevic, D., van den Bogaard, P.Melt evolution beneath a rifted carton edge: 40Ar/39/Ar geochronology and Sr-Nd-Hf-Pb isotope systematics of primitive alkaline basalts and lamprophyres from the SW Baltic Shield.Geochimica et Cosmochimica Acta, Vol. 173, pp. 1-36.Europe, SwedenAlkalic
DS201510-1809
2015
Tappert, M.Advancements in hyderspectral drill core imaging of kimberlites: examples from Snap Lake and Tango Extension.Vancouver Kimberlite Cluster, Sept. 23, 1p. AbstractCanada, Northwest TerritoriesDeposit - Snap Lake, Tango Extension
DS201508-0377
2015
Tappert, M.C., Rivard, B., Fulop, A., Rogge, D., Feng, J., Tappert, R., Stalder, R.Characterizing kimberlite dilution by crustal rocks at the Snap Lake diamond mine ( Northwest Territories, Canada) using SWIR ( 1.90-2.36 um) and LWIR ( 8.1-11.1um) hypersprectal imagery collected from drill core.Economic Geology, Vol. 110, 6, Sept-Oct. pp. 1375-1387.Canada, Northwest TerritoriesDeposit - Snap Lake
DS201512-1977
2015
Tappert, R., Tappert, M.C.hyper spectral imagery: a novel way to analyze kimberlite indicator minerals and to detect kimberlite micro-float.43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 102.Canada, Northwest TerritoriesHyperspectral imagery

Abstract: The collection and analysis of kimberlite indicator minerals from heavy mineral concentrates is an integral part of the diamond exploration process. However, surficial sampling programs are often restricted by time-consuming mineral collection, processing, and analysis procedures. To facilitate the development of a technique that can simplify and accelerate the identification and classification of kimberlite indicator minerals, we explored the usage of hyperspectral imagery, which is based on the analysis of reflected radiation in the visible and infrared parts of the electromagnetic spectrum. The investigation was focused on the identification of indicator garnets. Hyperspectral imagery was collected directly from heavy mineral concentrates, and these images were de-noised and processed to isolate the spectral absorption features relating to mineral composition. These images were then analyzed to identify individual garnets. This portion of the analysis was complemented by the results of 1000+ high-resolution spectra collected from well-characterized crust- and mantle-derived garnets to ensure that the garnets in the heavy mineral concentrates were accurately identified. Preliminary results indicate that garnets can be readily distinguished from other concentrate minerals using hyperspectral imagery, and that the garnets can also be compositionally classified. The compositional classification allows crust- and mantle-derived garnets to be distinguished accurately, while providing concentration information about certain transition elements, like chromium and titanium. In addition to the garnet analysis, hyperspectral imagery was also used to identify millimeter-sized fragments of kimberlite (kimberlite micro-float) in heavy mineral concentrates and unprocessed sediment samples. Preliminary results indicate that kimberlite micro-float can be readily distinguished from other rock and mineral fragments due to its distinct spectrum. Pending additional testing, analytical techniques using hyperspectral imagery may serve as an alternative to the costly and time-consuming indicator mineral identification methods currently being used.
DS201504-0224
2015
Tarakanov, R.Z., Veselov, O.V., Andreeva, M.Yu.The possible boundary of phase transitions at a depth of 350 km in the transition zone between continents and oceans.Doklady Earth Sciences, Vol. 460, 2, pp. 159-162.Russia, Far EastGeophysics - seismics
DS201509-0431
2015
Tarduno, J.An older geomagnetic field suggests an early start to plate tectonics. ( Jack Hills)Physics.org , Aug. 3, 1p.AustraliaGeophysics - magnetics
DS201509-0432
2015
Tarduno, J.A., Cottrell, R.D., Davis, W.J., Nimmo, F., Bono, R.K.A Hadean to Paleoarchean geodynamo recorded by single zircon crystals. ( Jack Hills)Science, Vol. 349, 6247, pp. 521-524.MantleGeodynamo

Abstract: Knowing when the geodynamo started is important for understanding the evolution of the core, the atmosphere, and life on Earth. We report full-vector paleointensity measurements of Archean to Hadean zircons bearing magnetic inclusions from the Jack Hills conglomerate (Western Australia) to reconstruct the early geodynamo history. Data from zircons between 3.3 billion and 4.2 billion years old record magnetic fields varying between 1.0 and 0.12 times recent equatorial field strengths. A Hadean geomagnetic field requires a core-mantle heat flow exceeding the adiabatic value and is suggestive of plate tectonics and/or advective magmatic heat transport. The existence of a terrestrial magnetic field before the Late Heavy Bombardment is supported by terrestrial nitrogen isotopic evidence and implies that early atmospheric evolution on both Earth and Mars was regulated by dynamo behavior.
DS201511-1886
2015
Tarum, A., Lee, S.J., Yap, C.M., Finkelstein, K.D., Misra, D.S.Impact of impurities and crystal defects on the performance of CVD diamond detectors.Diamond and Related Materials, in press available, 6p.TechnologySynthetics - Radiation detectors

Abstract: Radiation detectors based on diamond are highly favored for particle physics research due to the superior radiation hardness. In this work, we investigate the influence of impurities and crystalline imperfections on the charge collection efficiency (CCE) of single crystal diamond. Seventeen (17) ultra-low fluorescent diamond samples grown by microwave plasma chemical vapor deposition method from IIa Technologies PTE LTD are pre-selected for this study. The measured CCE of all samples using 241Am (?-particles) as ionizing source are analyzed together with the concentration of trace impurities and crystalline imperfection in the crystal. The amounts of impurities are quantified from integrated fluorescence intensity arising from the nitrogen vacancies (NV) created during different CVD growth process conditions. The crystal imperfections are assessed by X-ray rocking curves from X-ray topography images obtained at the Cornell High Energy Synchrotron Source. The CCE decays rapidly as the intensity of NV (INV), phonon sideband approaches that of diamond 2nd order Raman peak which follows the relation: View the MathML sourceCCEINV=100/1+INV1.052. The energy resolution, ?E/E (ratio of the energy spectrum width to the most probable peak) highly correlates with broader rocking curve width distribution. Prime novelty statement: This work provides an understanding on the most important factors that contribute to degradation of charge collection efficiency (CCE) in diamond based detectors and sensors. The CCE decays rapidly as the intensity of nitrogen vacancy phonon sideband approaches that of diamond 2nd order Raman peak which follows the relation: View the MathML sourceCCEINV=100/1+INV1.052. The energy resolution, that is the ratio of the energy spectrum width to the most probable peak, highly correlates with broader X-ray rocking curve width distribution.
DS201504-0225
2015
Tateno, S., Kuwayama, Y., Hirose, K., Ohishi, Y.The structure of Fe-Si alloy in Earth's inner core.Earth and Planetary Science Letters, Vol. 418, pp. 11-18.MantleCore
DS201512-1978
2015
Taylor, L.A., Logvinova, A.M., Howarth, G.H., Liu, Y., Peslier, A.H., Rossman, G.R., Guan, Y., Chen, Y., Sobolev, N.V.Low water contents in diamond mineral inclusions: proto-genetic origin in a dry cratonic lithosphere.Earth and Planetary Science Letters, Vol. 433, pp. 125-132.MantleNAMs Nominally Anhydrous Minerals

Abstract: The mantle is the major reservoir of Earth's water, hosted within Nominally Anhydrous Minerals (NAMs) (e.g., , , and ), in the form of hydrogen bonded to the silicate's structural oxygen. From whence cometh this water? Is the water in these minerals representative of the Earth's primitive upper mantle or did it come from melting events linked to crustal formation or to more recent metasomatic/re-fertilization events? During diamond formation, NAMs are encapsulated at hundreds of kilometers depth within the mantle, thereby possibly shielding and preserving their pristine water contents from re-equilibrating with fluids and melts percolating through the lithospheric mantle. Here we show that the NAMs included in diamonds from six locales on the Siberian Craton contain measurable and variable H2O concentrations from 2 to 34 parts per million by weight (ppmw) in olivine, 7 to 276 ppmw in clinopyroxene, and 11-17 ppmw in garnets. Our results suggest that if the inclusions were in equilibrium with the diamond-forming fluid, the water fugacity would have been unrealistically low. Instead, we consider the H2O contents of the inclusions, shielded by diamonds, as pristine representatives of the residual mantle prior to encapsulation, and indicative of a protogenetic origin for the inclusions. Hydrogen diffusion in the diamond does not appear to have modified these values significantly. The H2O contents of NAMs in mantle xenoliths may represent some later metasomatic event(s), and are not always representative of most of the continental lithospheric mantle. Results from the present study also support the conclusions of Peslier et al. (2010) and Novella et al. (2015) that the dry nature of the SCLM of a craton may provide stabilization of its thickened continental roots.
DM201506-1343
2015
The HeraldZim earns bargaining power for diamonds.Allafrica.com, May 19, 1/4p.Africa, ZimbabweNews item - legal
DM201510-2106
2015
The IndependentThe tragic saga of Marange . ( history from 2000 on)theIndependent.co.zw, Sept. 4, 1p.Africa, ZimbabweNews item - Marange
DM201512-2317
2015
The India TimesA new Siberian ice diamond created by Russian scientists will prove to be a game changer for the domestic industry. Cost around 1- 2 % of real.TheIndiatimes.com, Nov. 16, 1/4p.RussiaNews item - synthetics
DM201505-1344
2015
The Isareli Diamond IndustryCoronet gets Guiness world record for $ 2 million diamond guitar.israelidiamond.co.il, Mar. 24, 1/4p.TechnologyNews item - guitar
DM201505-1345
2015
The Isareli Diamond IndustryAntwerp police commissioner and diamond squad head arrested ( $ 55,000 diamonds and gold in his home)israelidiamond.co.il, Mar. 25, 1/4p.Europe, BelgiumNews item - legal
DM201503-1346
2015
The Israeli Diamond IndustryLouisiana man finds 2.01 carat diamond in Arkansas state park.israelidiamond.co.il, Feb. 8, 1/4p.United States, ArkansasNews item - Crater of Diamonds
DM201503-1347
2015
The Israeli Diamond IndustryIndia to certify 30,000 diamond polishers as "diamond artisans".israelidiamond.co.il, Feb. 10, 1/4p.IndiaNews item - polishing
DM201503-1348
2015
The Israeli Diamond IndustryThe mystery that still baffles scientists: what makes pink diamonds pink?israelidiamond.co.il Blog Stonehicky, Jan. 1, 1/4p.AustraliaNews item - pink diamonds
DM201504-1349
2015
The Israeli Diamond IndustryAngola tax changes out of sync with country's mining code.israelidiamond.co.il, Mar. 11, 1/4p.Africa, AngolaNews item - legal
DM201505-1350
2015
The Israeli Diamond IndustryA summary of 2014 and forecast for 2015.israelidiamond.co.il, Apr. 13, 1p.GlobalNews item - prices
DM201506-1351
2015
The Israeli Diamond Industry5 yellow diamonds found at Arkansas Crater Park in a week. Historical coverage.israelidiamond.co.il, Apr. 20, 1/2p.United States, ArkansasNews item - Crater of Diamonds
DM201506-1352
2015
The Israeli Diamond IndustryDiamond Corp recovers 19.83 carat diamond from Lace mine.israelidiamond.co.il, Apr. 30, 1/4p.Africa, South AfricaNews item - DiamondCorp
DM201506-1353
2015
The Israeli Diamond IndustryScientist discovers a "diamond finding plant" in Liberia ( Haggerty)israelidiamond.co.il, May 6, 1/4p.Africa, LiberiaNews item - botany
DM201507-1358
2015
The Israeli Diamond Industry1.3 million carats a year: the Aikhal diamond mine.israelidiamond.co.il, June 1, 1/4p.RussiaNews item - Alrosa
DM201507-1359
2015
The Israeli Diamond IndustryZimbabwe orders Anjin to reinstate 1,100 employees.israelidiamond.co.il, June 10, 1/4p.Africa, ZimbabweNews item - Anjin
DM201507-1360
2015
The Israeli Diamond IndustryThe world's top miners lost $ 156 billion in market value in 2014.israelidiamond.co.il, June 9, 1/4p.GlobalNews item - economics
DM201508-1354
2015
The Israeli Diamond IndustryAngola's private gem: The Luarica diamond mine.israelidiamond.do.il, June 29, 1/4p.Africa, AngolaNews item - Endiama, Trans Hex
DM201509-1355
2015
The Israeli Diamond IndustryWe didn’t see, we didn’t hear. We just talked. Presidents meeting.israeildiamond.co.il, Aug. 3, 2p.Europe, IsraelNews item - industry
DM201509-1356
2015
The Israeli Diamond IndustryDe Beers: medium to long term outlook for diamonds extremely positive.israeildiamond.co.il, Aug. 11, 1/4p.GlobalNews item - De Beers
DM201509-1357
2015
The Israeli Diamond IndustryLucapa recovers 5 large special diamonds at Lulo. BLK-08israeildiamond.co.il, Aug. 20, 1/4p.Africa, AngolaNews item - Lucapa
DM201510-2107
2015
The Israeli Diamond IndustryFair price and best value in large fancy yellow and white stones.israeildiamond.co.il, Sept. 16, 1p.GlobalNews item - prices, supply, demand
DM201511-2201
2015
The Israeli Diamond IndustryThe gem of southern Africa: Namibian diamonds.israelidiamond.co.il, Oct. 14, 1p.Africa, NamibiaNews item - Namdeb
DM201511-2202
2015
The Israeli Diamond IndustryDiamonds detect early stage cancer. ( MRI scans)israelidiamond.co.il, Oct. 15, 1/2p.TechnologyNews item - MRI scans
DM201512-2318
2015
The Israeli Diamond IndustryEU not expected to regulate conflict diamonds until mid-2016.israelidiamond.co.il, Oct. 28, 1/4p.GlobalNews item - legal
DM201512-2319
2015
The Israeli Diamond IndustryAfrica's troublemakers: history of diamonds in the Central African Republic.israelidiamond.co.il, Nov. 11, 1p.Africa, Central African RepublicNews item - KP
DM201512-2320
2015
The Israeli Diamond IndustryScientists smash an 8 carat diamond to discover secrets within. Dating clinopyroxene (Namakwa Diamonds donated diamond).israelidiamond.co.il, Nov. 19, 1p.TechnologyNews item - Namakwa
DS201508-0378
2015
The Israeli Diamond IndustryTop 10 most expensive diamonds in the world: Millenium Star, Koh-i-Noor, Culinan, Hope, Centenary, Shawish ring, Pink Star, Beau Sancy, Moussaieff Red, Graff Pink.israelidiamond.co, June 29, 2p.GlobalDiamonds notable - prices
DM201506-1361
2015
The New York TimesChanges are reshaping the world's diamond market.The New York Times, May 13, 2p.GlobalNews item - markets
DM201512-2321
2015
The New York TimesBorrowing from solar and chip tech to make diamonds faster and cheaper. ( before Nanosolar) now Diamond FoundryThe New York Times, Nov. 11, 6p.TechnologyNews item - Diamond Foundry
DM201509-1362
2015
The Siberian TimesRussia reveals 'unique diamonds' created by gases and lightning from volcanic eruption.The Siberian Times, July 27, 10p.Russia, KamchatkaNews item - Tolbachik
DM201506-1363
2015
The StandardBikita Diamonds - a tale of shady deals.Allafrica.com, May 17, 1/4p.Africa, ZimbabweNews item - Bikita
DM201505-1364
2015
The Swazi ObserverDvololwako diamond mine to be revived this year…. ( again?)observer.org.sz, Mar. 25, 1/4p.Africa, SwazilandNews item - Dvokolwayo
DM201509-1365
2015
The Washington PostThe dangerous search for emeralds in Colombia. After taking over a major mine, a U.S. Company ( MTC) has met with violence.The Washington Post, reprint Republicofmining.com, Aug. 9, 8p.South America, ColombiaNews item - emeralds
DM201508-1366
2015
The West AustralianMarmion enters Ellendale fray. ( Mines Minister)The West Austrailan Newspaper, July 13, 1p.AustraliaNews item - Kimberley Diamonds
DM201509-1367
2015
The West AustralianKDL offer to retake Ellendale.The West Australian Newspaper, July 8, 1/2p.AustraliaNews item - Kimberley Diamonds
DM201509-1368
2015
The West AustralianEllendale assets go ahead of collapse.The West Australian Newspaper, July 8, 1/2p.AustraliaNews item - Kimberley Diamonds
DM201509-1369
2015
The West Australiantax payers take Kimberley Diamonds' Ellendale hit.The West Australian Newspaper, July 4, 1p.AustraliaNews item - Kimberley Diamonds
DM201509-1370
2015
The West AustralianLate KDL payments irk DMP.The West Australian Newspaper, July 4-5, p. 101.AustraliaNews item - Kimberley Diamonds
DM201509-1371
2015
The West AustralianMarmion enters Ellendale fray. ( Mines Minister DMP)The West Australian Newspaper, July, 13, p. 56.AustraliaNews item - Kimberley Diamonds
DM201509-1372
2015
The West AustralianPrecious little left to salvage. ( Ellendale - details of Goodrich Resources )The West Australian Newspaper, July 11-12, p. 99.AustraliaNews item - Kimberley Diamonds
DM201509-1373
2015
The West AustralianASIC probes Kimberley after Ellendale collapse. ( Owed to staff… )The West Australian Newspaper, July 16, p. 46.AustraliaNews item - Kimberley Diamonds
DS201509-0433
2015
Thiery, V., Rolin, P., Dubois, M., Caumon, M-C.Discovery of metamorphic microdiamonds from the parautochthonous units of the Variscan French Massif Central.Gondwana Research, Vol. 28, pp. 954-960.Europe, FranceMicrodiamonds

Abstract: The Variscan French Massif Central (FMC) is classically described as a stack of nappes with increasing metamorphism from the bottom (parautochthonous unit) to the top (lower and upper gneiss units). Ultra-high pressure (UHP) metamorphism was already recognized in the uppermost units, with notably coesite-bearing rocks. We report the first finding of metamorphic microdiamonds in the parautochthonous unit, revealing that the UHP event affected the whole stack of nappes and also that the pressures reached are above what was previously expected, since the presence of diamond, according to the peak temperature estimates for this unit, indicates pressures of ca. 3 GPa (i.e. 100 km depth). At the scale of the FMC, this finding adds complexity to the established models. On a broader scale, this adds evidence of similarity between this part of the belt and other UHP Variscan terranes such as the Erzgebirge and the Bohemian Massif.
DS201502-0113
2014
Thomson, A.R., Kohn, S.C., Bulanova, G.P., Smith, C.B., Araujo, D., EMIF, Walter, M.J.Origin of sub-lithospheric diamonds from the Juina-5 kimberlite ( Brazil): constraints from carbon isotopes and inclusion compositions.Contributions to Mineralogy and Petrology, Vol. 168, pp. 1081-1110.South America, BrazilDeposit - Juina-5
DM201502-1374
2014
Tian, L.Supply factors tarnish India's diamond sector.Globaltimes.cn, Dec. 29, 2p.IndiaNews item - rough demand
DS201506-0297
2015
Tian, Y., Yang, J., Robinson, P.T., Xiong, F., Li, Y., Zhang, Z., Liu, Z., Liu, F., Niu, X.Diamond discovered in high Al chromitites of the Sartohay ophiolite, Xinjiang province China.Acta Geologica Sinica, Vol. 89, 2, pp. 332-340.ChinaChromitite
DM201509-1375
2015
Time MagazineBlood Diamonds …. Congolese miners working one of the thousands of artisanal mines that cover the country.Time Magazine, Aug. 18p.Africa, Democratic Republic of CongoNews item - history
DS201503-0180
2015
Titkov, S.V., Mineeva, R.M., Zudina, N.N., Sergeev, A.M., Ryabchikov, I.D., Shiryaev, A.A., Speransky, A.V., Zhikhareva, V.P.The luminescent nature of orange coloration in natural diamonds: optical and EPR study.Physics and Chemistry of Minerals, Vol. 42, 2, pp. 131-144.TechnologyDiamond Colour
DS201502-0114
2015
Titkov, S.V., Shiryaev, A.A., Zudina, N.N., Zudin, N.G., Solodova, Yu.P.Defects in cubic diamonds from the placers in the northeastern Siberian platform: results of IR microspectrometry.Russian Geology and Geophysics, Vol. 56, 1, pp. 354-365.RussiaDiamond morphology
DS201502-0115
2015
Tkalcic, H.Complex inner core of the Earth: the last frontier of global seismology.Reviews of Geophysics, Vol. 53, 1, pp. 59-94.MantleGeophysics - seismics
DS201505-0247
2015
Toledo, V., Apter, D.B., Ward, J.High pressure indicator minerals from the Rakefet magmatic complex ( RMC), Mt. Carmel, Israel.Israel Geological Society, 1p.posterEurope, IsraelMineralogy
DS201505-0248
2015
Toledo, V., Ward, J., de Wit, M., Spaggiari, R., Coopersmith, H., Wald, R.A transient fluvial placer in the mid reach of the Kishon Valley northern Israel: initial results of follow up exploration.Israel Geological Society, 1p.posterEurope, IsraelExploration results
DM201508-1376
2015
Toronto StarA diamond mine isn't forever… a full page on Kimberley SA Toronto Star Newspaper, July 4, 1 page.Africa, South AfricaNews item - Kimberley
DM201511-2203
2015
Toronto StarA rough reception for diamond giant in Cree community. Residents of Peawanuck watch warily as De Beers eyes new prospects in northern Ontario.Toronto Star Newspaper, Oct. 11, 5p. Canada, OntarioNews item - De Beers
DM201511-2204
2015
Toronto StarDocumentary film looks at effects of mine on Attawapiskat.Toronto Star Newspaper, Oct. 22, 1p.Canada, Ontario, AttawapiskatNews item - Victor
DM201512-2322
2015
Toronto StarDe Beers seeks First Nation exploration support. A De Beers Canada is visiting remote Weenusk First Nation. Victor areaThe Toronto Star Newspaper, Nov. 18, 1p.Canada, Ontario, AttawapiskatNews item - De Beers
DC201507-1736
2015
Trans Hex Group LimitedUpdate on Baken, Bloeddrif, Somiluana, Namaqualand ( Kleinzee, Mitchell's Bay, KoingraasTrans Hex Group, June 5, 1p.Africa, South Africa, AngolaNews item - press release
DC201507-1737
2015
Trans Hex Group LimitedTrans Hex 'will not overpay' for De Beers unit ( Kimberley Tailings operation).Trans Hex Group, June 2, 1/2p.Africa, South AfricaNews item - press release
DS201512-1979
2015
Tremblay, J., Bedard, L.P., Matton, G.A petrographic study of Nb-bearing minerals at the Saint-Honore niobium deposit.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov. 13-14, pp. 75-82.Canada, QuebecNiobium

Abstract: The mineralogy of rare earth element (REE) ore deposits is critical in understanding their petrogenesis but also has signifi cant implications for metallurgy. Like many ore deposits, high-grade rocks do not necessarily equate to positive economic viability and this is especially true for REE deposits. Consequently, knowledge of sample mineralogy acquired early in a project’s life can lead to more effi cient exploration programs through confi rmation of either ‘good’ or ‘bad’ mineralogy. Many REE minerals show fi ne grain sizes and their accumulation can be diffi cult to recognize in hand sample or drill core with an unaided eye. Knowledge of their distribution before sampling can ensure that the best rocks or core lengths are sampled for petrographic or detailed study. REE minerals generally have complex yet diagnostic absorption patterns in visible to shortwave infrared (VNIRSWIR) refl ectance spectra that are driven primarily by REErelated 4f-4f intraconfi gurational electronic transitions. Our recent research (Turner et al., 2014, Turner 2015) has focused on three important mineral classes: REE fl uorocarbonates (bastnaesite, synchysite, and parisite), REE phosphates (monazite, xenotime, and britholite), and REE-bearing silicates (cerite, mosandrite, kainosite, zircon and eudialyte). Refl ectance spectra were acquired in the visible to short wave infrared regions (500 nm to 2500 nm) and samples were characterized using scanning electron microscopy and electron microprobe analysis. The results of our work and publications from other research groups (e.g., Rowan et al., 1986, Swayze et al., 2013, Hoefen et al., 2014, Boesche et al., 2015) have shown the strong applicability of refl ectance spectroscopy and hyperspectral imaging to understanding, exploring, and exploiting rare earth element ore deposits and their associated rocks.
DC201504-1738
2015
Trigold Resources Inc.Trigold signs letter of intent on diamond project. Rush, James River and Muskox kimberlites.Trigold Resources Inc., Mar. 13, 2p.Canada, NunavutNews item - press release
DC201506-1739
2015
Trigold Resources Inc.Trigold signs agreement on advanced diamond projects. Rush, James River and Muskox.Trigold Resources Inc., May 6, 2p.Canada, NunavutNews item - press release
DC201511-2411
2015
Trigold Resources Inc.Trigold changes name to Crystal Exploration Inc. Finalizing acquisition of Rush, James River and Muskox.Trigold Resources Inc., Oct. 14, 1p.Canada, Northwest TerritoriesNews item - press release
DS201502-0116
2014
Trubitsyn, V.P., Evseev, M.N.Mantle plumes at the boundary of the Upper and Lower mantle.Doklady Earth Sciences, Vol. 459, 1, pp. 1397-1399.MantleHotspots
DS201510-1810
2015
Trubitsyn, V.P., Evseev, M.N., Trubitsyn, A.P.Influence of continents and lithospheric plates on the shape of D" layer and the spatial distribution of mantle plumes.Russian Journal of Earth Sciences, Vol. 15, ES3001 8p.MantlePlume

Abstract: The regularities of the global intraplate volcanism of the Earth are explained by the mantle plumes originating at the heads and margins of two piles of dense material of the hot and relatively heavy D?? layer at the base of the mantle. Due to thermal blanket effect under a supercontinent the overheated region with ascending flows arises in the mantle. These flows distort the D?? layer and produce the thermochemical piles in the lowermost mantle under the supercontinent. It is supposed that the pile under Africa originated at the time of existence of Pangea, while the pile under the Pacific Ocean originated at the time of existence of Rodinia. As Africa succeeds to Pangea, the pile under Africa exists until now. But it stays unclear why the pile under the Pacific Ocean exists up to now despite supercontinent Rodinia has been broken-up a long time ago. The numerical models of thermochemical convection in the whole mantle with spherical geometry which include the heavy D?? layer allow to clear up effects of supercontinents and lithospheric plates on deformations of the D?? layer by mantle flows and formation of the thermochemical piles.
DC201501-1740
2014
True North Gems Inc.Mine development progress report for the Aappaluttoq ruby project.True North Gems Inc., Dec. 16, 1p.Europe, GreenlandNews item - press release
DC201502-1741
2015
True North Gems Inc.True North to update Aappaluttoq pre-feasibility study.True North Gems Inc., Jan. 6, 1p.Europe, GreenlandNews item - press release
DC201503-1742
2015
True North Gems Inc.True North Gems provides Aappaluttoq construction update.True North Gems Inc., Jan. 29, 2p.Europe, GreenlandNews item - press release
DC201504-1743
2015
True North Gems Inc.True North Gems announces positive update to Aappaluttoq pre-feasibility study.Ture North Gems Inc., Feb 25, 3p.Europe, GreenlandNews item - press release
DC201504-1744
2015
True North Gems Inc.True North appoints Raymond Simpson to Board of Directors.Ture North Gems Inc., Feb. 26, 1p.Europe, GreenlandNews item - press release
DC201504-1745
2015
True North Gems Inc.True North Gems files pre-feasibility study and provides construction update on the Aappaluttoq project.True North Gems Inc., Mar. 18, 2p.Europe, GreenlandNews item - press release
DC201509-1746
2015
True North Gems Inc.True North Gems secures US$ 4 million in financing for the Aappaluttoq ruby project in SW Greenland.True North Gems Inc., Aug. 26, 2p.Europe, GreenlandNews item - press release
DC201511-2412
2015
True North Gems Inc.True North Gems pours concrete for the Aappaluttoq ruby and pink sapphire process plant.True North Gems Inc., Sept. 30, 1p.Europe, GreenlandNews item - press release
DC201512-2462
2015
True North Gems Inc.True North Gems completes procurement & shipping of gemstone processing plant. AappaluttoqTruth North Gems Inc., Nov. 5, 2p.Europe, GreenlandNews item - press release
DC201501-1747
2014
Tsodilo Resources LimitedConceptual model for BK16.Tsodilo Resources Limited, Dec. 15, 2p.Africa, BotswanaNews item - press release
DC201505-1752
2015
Tsodilo Resources LimitedPurchases mobile DMS treatment plant.Tsodillo Resources Ltd., Apr. 8, 2p.Africa, BotswanaNews item - press release
DC201506-1748
2015
Tsodilo Resources LimitedCompletes diamond core drilling program on BK16. Tsodilo Resources Limited, May 6, 3p.Africa, BotswanaNews item - press release
DC201507-1753
2015
Tsodilo Resources LimitedTakes possession of previously recovered diamonds from BK16.Tsodilo Resources Ltd., June 22, 2p. Photos on websiteAfrica, BotswanaNews item - press release
DC201508-1749
2015
Tsodilo Resources LimitedExploration geological model and exploration target for BK16.Tsodilo Resources Limited, July 15, 5p.Africa, BotswanaNews item - press release
DC201509-1750
2015
Tsodilo Resources LimitedAnnounces non-brokered private placement ( project Gcwihaba Resources ).Tsodilo Resources Limited, Aug. 5, 1p.Africa, BotswanaNews item - press release
DC201509-1751
2015
Tsodilo Resources LimitedTsodilo Resources closes private placement financing. Tsodilo Resources Limited, Aug. 10, 1p.Africa, BotswanaNews item - press release
DC201510-2369
2015
Tsodilo Resources LimitedTsodilo Resources Limited is pleased to announce the appointment of Mark Scowcroft to its Board of Directors as a non-executive director, effective September 1, 2015.Tsodilo Resources Limited, Sept. 1, 1p.Africa, BotswanaNews item - press release
DC201512-2463
2015
Tsodilo Resources LimitedTsodilo share private placement accepted by TSX-V.Tsodilo Resources Ltd., Oct. 29, 1p.Africa, BotswanaNews item - press release
DS201502-0117
2015
Tsuno, K., Dasgupta, R.Fe Ni Cu C S phase relations at high pressures and temperatures - the role of sulfur in carbon storage and diamond stability at mid to deep upper mantle.Earth and Planetary Science Letters, Vol. 412, pp. 132-142.MantleCarbon
DS201512-1980
2015
Turner, D., Rivard, B., Groat, L.Visible to shortwave infrared reflectance spectroscopy of rare earth element minerals.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov. 13-14, pp. 219-230.TechnologyRare earths
DM201506-2477
2015
Turner, R.Timberlites and crutons: the early days of the Great Canadian diamond rush. Precis of his talk to 25th. Anniversary celebration of MDRU.The Northern Miner, May 11-17, p. 5CanadaNews item - history
DM201511-2205
2015
Turner, R.The great Canadian diamond rush. Vancouver Kimberlite Cluster, Oct. 28, 1/4p. AbstractCanadaNews item - history
DS201507-0338
2015
Upadhyay, D., Kooijman, E., Singh, A.K., Mezger, K., Berndt, J.The basement of the Deccan Traps and its Madagascar connection: constraints from xenoliths.Journal of Geology, Vol. 123, pp. 295-310.Africa, MadagascarXenoliths
DS201504-0226
2015
Valentine, G.A., Graettinger, A.H, Macorps, E., Ross, P-S., White, J.D.L., Dohring, E., Sonder, I.Experiments with vertically and laterally migrating subsurface explosions with applications to the geology of phreatomagmatic and hydrothermal explosion craters and diatremes.Bulletin of Volcanology, Vol. 77, 15p.TechnologyDiatremes, kimberlites
DS201504-0227
2014
Valentine, G.A., Graettinger, A.H, Sonder, I.Explosion depths for phreatomagmatic eruptions.Geophysical Research Letters, Vol. 41, pp. 3045-51.TechnologyMagmatism - phreatomagmatic
DS201509-0434
2015
Valley, J.W., Reinhard, D.A., Cavosie, A.J., Ushikubo, T., Lawrence, D.F., Larson, D.J., Kelly, T.F., Snoeyenbos, D.R., Strickland, A.Nano- and micro-geochronology in Hadean and Archean zircons by atom-probe tomography and SIMS: new tools for old minerals.American Mineralogist, Vol. 100, pp. 1355-1377.AustraliaGeochronology

Abstract: Atom-probe tomography (APT) and secondary ion mass spectrometry (SIMS) provide complementary in situ element and isotope data in minerals such as zircon. SIMS measures isotope ratios and trace elements from 1–20 ?m spots with excellent accuracy and precision. APT identifies mass/charge and three-dimensional position of individual atoms (±0.3 nm) in 100 nm-scale samples, volumes up to one million times smaller than SIMS. APT data provide unique information for understanding element and isotope distribution; crystallization and thermal history; and mechanisms of mineral reaction and exchange. This atomistic view enables evaluation of the fidelity of geochemical data for zircon because it provides new understanding of radiation damage, and can test for intracrystalline element mobility. Nano-geochronology is one application of APT in which Pb isotope ratios from sub-micrometer domains of zircon provide model ages of crystallization and identify later magmatic and metamorphic reheating.
DS201502-0118
2015
van der Meijde, M., Fadel, I., Ditmar, P., Hamayun, M.Uncertainties in crustal thickness models for dat a sparse environments: a review for South America and Africa.Journal of Geodynamics, Vol. 84, 1, pp. 1-18.South America, AfricaGeophysics - seismics
DS201503-0181
2015
Van Kranendonk, M.J., Smithies, R.H., Griffin, W.L., Huston, D.L., Hickman, A.H., Champion, D.C., Anhaeusser, C.R., Pirajno, F.Making it thick: a volcanic plateau origin of Paleoarchean continental lithosphere of the Pilbara and Kaapvaal cratons.Geological Society of London Special Publication: Continent formation through time., No. 389, pp. 83-111.Australia, Africa, South AfricaGeotectonics
DS201502-0119
2014
Van Leeuwen, T.The enigmatic Sundaland diamonds - a review.Proceedings of Sundaland Resources 2014 MGEI Annual Convention held Nov. 17-18, Palembang, South Sumatra, Indonesia, 28p. Available pdfIndonesia, Kalimantan, MyanmarSundaland diamonds
DS201512-1981
2015
Van Wychen, W., Copland, L., Burgess, D.O., Gray, L., Schaffer, N., Fisher, T.Glacier velocities and dynamic discharge from the ice masses of Baffin Island and Bylot Island, Nunavut, Canada.Canadian Journal of Earth Sciences, Vol. 52, 11, pp. 980-989.Canada, Nunavut, Baffin IslandGeomorphology

Abstract: Speckle tracking of ALOS PALSAR fine beam data from 2007-2011 are used to determine the surface motion of major ice masses on Baffin Island and Bylot Island in the southern Canadian Arctic Archipelago. Glacier velocities are low overall, with peaks of ?100 m a?1 and means of ?20-60 m a?1 common along the main trunk of many outlet glaciers. Peak velocities on Penny and Bylot Island ice caps tend to occur near the mid-sections of their primary outlet glaciers, while the fastest velocities on all other glaciers usually occur near their termini due to relatively large accumulation areas draining through narrow outlets. Estimates of ice thickness at the fronts of tidewater-terminating glaciers are combined with the velocity measurements to determine a regional dynamic discharge rate of between ?17 Mt a?1 and ?108 Mt a?1, with a mid-point estimate of ?55 Mt a?1, revising downward previous approximations. These velocities can be used as inputs for glacier flow models, and provide a baseline dataset against which future changes in ice dynamics can be detected.
DS201510-1811
2015
Vandenberg, J.A., Herrell, M., Faithful, J.W., Snow, A.M., Lacrampe, J., Bieber, C., Dayyani, S., Chisholm, V.Multiple modeling approach for the aquatic effects assessment of a proposed northern diamond mine development. Gahcho KueMine Water and the Environment, in press available, 19p.Canada, Northwest TerritoriesDeposit - Gahcho Kue

Abstract: Eight water models were used to assess potential aquatic environmental effects of the proposed Gahcho Kué diamond mine on groundwater and surface water flow and quality in the Northwest Territories, Canada. This sequence of models was required to cover different spatial and temporal domains, as well as specific physico-chemical processes that could not be simulated by a single model. Where their domains overlapped, the models were interlinked. Feedback mechanisms amongst models were addressed through iterative simulations of linked models. The models were used to test and refine mitigation plans, and in the development of aquatic component monitoring programs. Key findings generated by each model are presented here as testable hypotheses that can be evaluated after the mine is operational. This paper therefore offers a record of assumptions and predictions that can be used as a basis for post-validation.
DS201510-1812
2015
Vasconcelos, L.Geoethics - Africa needs to be respected and heard.Journal of African Earth Sciences, Vol. 111, p. 287. 1p.AfricaCSR - ethics

Abstract: The Journal of African Earth Sciences (Vol. 111, 2015, page 287) has published a "Short Note" entitled "Geoethics: Africa must be respected and heard!" by Lopo Vasconcelos, Jesus Martinez-Frias and Aberra Mogessie, raising an important issue: the need to include ethical issues in the educational systems of Africa. Reference is made to a project aiming at "providing the entire African continent with a roadmap to face the target of geoscience education within a wide scope and a multidisciplinary approach" GEO-ERA (GEOscience Education Roadmap for Africa) promoted and coordinated by the IUGS-Commission on Geoscience Education, Training and Technology Transfer (IUGS-COGE) and the Geological Society of Africa (GSAf). Considering that Education and Ethics must go along together, GSAf and IAGETH (International Association for Geoethics) signed in 2013, after the 24th Colloquium of African Geology, CAG24 (Addis Ababa) a Memorandum of Understanding in order to accomplish this and other goals.
DS201512-1982
2015
Verplanck, P.L., Farmer, G.L., Mariano, A.N.Nd and Sr isotopic composition of rare earth element mineralized carbonatites.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov. 13-14, pp. 65-74.GlobalCarbonatite

Abstract: For nearly 50 years, carbonatites have been the primary sources of niobium and rare earth elements (REEs), particularly the light REEs including La, Ce, Pr, and Nd. In addition, carbonatites may be enriched in other critical elements and have the potential to be future sources. Currently, only fi ve of the more than 500 known carbonatites in the world are being mined for REEs: Bayan Obo (Inner Mongolia, China); Maoniuping (Sichuan, China); Dalucao (or Daluxiang, Sichuan, China); and Mountain Pass (California, USA), and the carbonatite-derived laterite at Mount Weld (Australia). To achieve ore-grade REE enrichment, initial carbonatitic magmas require an adequate endowment of REEs and need to evolve in ways for these elements to concentrate in REE-bearing mineral phases. Radiogenic isotope studies of carbonatites clearly point to a mantle origin, but a wide range in isotopic compositions has led to contrasting views about the specifi c mantle reservoir(s) that sourced carbonatites. In this study we use the neodymium and strontium isotopic compositions of a suite of mineralized carbonatites to establish the nature of the source magmas. We examine samples that span a wide range in age (~23 Ma to 1385 Ma), Nd concentrations (3720 to 32,900 ppm), and Sr concentrations (2290 to 167,900 ppm). Our Nd and Sr isotopic data include multiple samples from Mountain Pass (USA; ?Nd i = -3.1 to -5.4, Sri = 0.70512 to 0.70594), Elk Creek (USA; ~?Nd i = 1.7, Sri = 0.7035), and Maoniuping (China; ?Nd i = -4.1 and -4.2, Sri = 0.70627 and 0.70645), and one sample each from Bear Lodge (USA; ?Nd i = 0.1, Sri = 0.70441), Kangankunde (Malawi; ?Nd i = 3.3, Sri = 0.70310), Adiounedj (Mali; ?Nd i = -0.1, Sri = 0.70558), and Mushgai Khudag (Mongolia; ?Nd i = -1.3, Sri = 0.70636). Isotopic data from two producing carbonatite REE deposits (Mountain Pass and Maoniuping) have broadly similar isotopic compositions (?Nd i = -3.1 to -5.4 and Sri = 0.7051 to 0.7065), and these compositions point to a carbonated source in the lithospheric mantle. Mineralized but unmined carbonatites have higher Nd initial isotopic compositions (?Nd i = -1.3 to 3.3) and a wider range in Sr isotopic compositions (Sri = 0.70310 to 0.70637), but these data are consistent with a lithospheric mantle reservoir.
DS201512-1983
2015
Vershovskii, A.K., Dmitriev, A.K.Pecularities of optical and ODMR spectra of nitrogen-vacancy color centers in diamond crystals.Journal of Physics Condensed Matter, Vol. 541, 1, pp. 12090-12094.TechnologyDiamond crystallography

Abstract: The optical and ODMR spectra of nitrogen vacancy (NV) centers in diamond were investigated as applied to the development of micro-scale diamond magnetometer sensor. It is shown that the NV0 center (unlike the NV? center) has an absorption line in the UV range. The inversion of the zero phonon line of the NV? center was observed and explained. ODMR signals in high magnetic fields (as compared with inner fields in the crystal) as well as in weak fields also were investigated. We propose the solution to the problem of the magnetometer sensitivity reduction at low magnetic field, that is of interest for quantum magnetometry applications. Peculiarities of optical and ODMR Spectra of Nitrogen-Vacancy Color Centers in Diamond Crystals.
DS201507-0339
2015
Vladkar, S.G.Mineralogy and geochemistry of fenitized nephelinites of the Amba Dongar complex, Gujarat.Journal of the Geological Society of India, Vol. 85, 1, pp. 87-97.IndiaNephelinite
DS201502-0120
2015
Vladykin, N.K-alkaline rocks and lamproites of Tomtor Massif.Economic Geology Research Institute 2015, Vol. 17,, # 2937, 1p. AbstractRussiaLamproite
DS201502-0121
2015
Vladykin, N.Maldzhangarsky rare metal carbonatite massif in the NE part of the Anabar shield.Economic Geology Research Institute 2015, Vol. 17,, # 2891, 1p. AbstractRussiaCarbonatite
DS201504-0228
2015
Vynntska, L., Bunge, H-P.Restoring past mantle convection structure through fluid dynamic inverse theory: regularization through surface velocity boundary conditions.International Journal of Geomathematics, Vol. 6, 1, pp. 83-100.MantleGeodynamics
DS201509-0435
2015
Wainwright, A.N., Luguet, A., Fonsec, R.O.C., Pearson, D.G.Investigating metasomatic effects on the 187Os isotopic signature: a case study on the micrometric base metal sulphides in metasomatised peridotite from the Letlhakane kimberlite, (Botswana). Lithos, Vol. 232, pp. 35-48.Africa, BotswanaDeposit - Letlhakane

Abstract: The peridotite xenoliths of the Letlhakane kimberlite (Botswana), which intrude the Proterozoic Magondi Belt on the western margin of the Zimbabwe craton, represent highly depleted melting residues. These residues suffered subsequent variable metasomatic overprinting, evidenced by cryptic trace element enrichments in the spinel peridotites to modal addition of phlogopite, clinopyroxene and spinel within the garnet peridotites. In order to assess the robustness of the Re–Os chronometer in such highly metasomatised peridotites, detailed investigations of base metal sulphide (BMS) petrography and single-BMS grain 187Os/188Os analyses have been undertaken in three representative peridotites.
DM201511-2206
2015
Wall Street JournalRio Tinto pares output of less-sparkling niche commodities. Diamonds and salt. Republicofmining.comWall Street Journal, Oct. 16, 1/2p.GlobalNews item - Rio Tinto
DM201511-2207
2015
Wall Street JournalInside De Beers's hunt for Africa's elusive diamonds. Kalahari desertWall Street Journal, Oct. 23, 1p.Africa, BotswanaNews item - De Beers
DM201512-2323
2015
Wall Street JournalRichards bared new details of the company's financial troubles. Koidu mine.Wall Street Journal , Nov. 11, 2p.Africa, Sierra LeoneNews item - BSG Resources
DS201510-1813
2015
Walter, M.J., Thomson, A.R., Wang, W., Lord, O.T., Ross, J., McMahon, S.C., Baron, M.A., Melekhova, E., Kleppe, A K., Kohn, S.C.The stability of hydrous silicates in Earth's lower mantle: experimental constraints from the systems MgO-SiO2-H2O and MgO-Al2O3-SiO2-H2).Chemical Geology, Vol. 418, pp. 16-29.MantleExperimental petrology

Abstract: We performed laser-heated diamond anvil cell experiments on bulk compositions in the systems MgO-SiO2-H2O (MSH) and MgO-Al2O3-SiO2-H2O (MASH) that constrain the stability of hydrous phases in Earth’s lower mantle. Phase identification by synchrotron powder diffraction reveals a consistent set of stability relations for the high-pressure, dense hydrous silicate phases D and H. In the MSH system phase D is stable to ~ 50 GPa, independent of temperature from ~ 1300 to 1700 K. Phase H becomes stable between 35 and 40 GPa, and the phase H out reaction occurs at ~ 55 GPa at 1600 K with a negative dT/dP slope of ~ -75 K/GPa. Between ~ 30 and 50 GPa dehydration melting occurs at ~ 1800K with a flat dT/dP slope. A cusp along the solidus at ~ 50 GPa corresponds with the intersection of the subsolidus phase H out reaction, and the dT/dP melting slope steepens to ~ 15 K/GPa up to ~ 85 GPa.
DS201508-0379
2015
Wang, K-L., Prikhodko, V., O'Reilly, S.Y., Griffin, W.L., Pearson, N.J., Kovach, V., Lizuka, Y., Chien, Y-H.Ancient mantle lithosphere beneath the Khanka Massif in Russian Far-East: in situ Re-Os evidence.Terra Nova, Vol. 27, 4, pp. 277-284.RussiaGeochronology
DS201512-1984
2015
Wang, K-L., Prikhodo, V., O'Reilly, S.Y., Griffin, W.L., Pearson, N.J., Kovach, V., Iizuka, Y., Chien, Y-H.Ancient mantle lithosphere beneath the Khanka massif in the Russian Far East: in situ Re-Os evidence.Terra Nova, Vol. 27, 4, pp. 277-284.RussiaGeochronology

Abstract: The Os-isotope compositions of sulphides in mantle xenoliths hosted by Late Miocene alkali basalts from the Sviyaginsky volcano, Russian Far East, reveal the presence of Archaean-Proterozoic subcontinental lithospheric mantle beneath the Khanka massif. Their TMA and TRD model ages reveal similar peaks at 1.1 and 0.8 Ga suggesting later thermotectonic events in the subcontinental lithospheric mantle, whereas TRD model ages range back to 2.8 ± 0.5 (2?) Ga. The events recognized in the subcontinental lithospheric mantle are consistent with those recorded in the crust of the Khanka massif. The sulphide Os-isotope data show that the subcontinental lithospheric mantle beneath the Khanka massif had formed at least by the Mesoproterozoic, and was subsequently metasomatized by juvenile crustal-growth events related to the evolution of the Altaids. The Khanka massif is further proposed to have tectonic affinity to the Siberia Craton and should originate from it accordingly.
DS201512-1985
2015
Wang, S-J., Teng, F-Z., Rudnick, R.L., Li, S-G.Magnesium isotope evidence for a recycled origin of cratonic eclogites.Geology, Vol. 43, 12, pp. 1071-1074.Africa, Sierra LeoneDeposit - Koidu

Abstract: The Mg isotopic compositions of garnet and clinopyroxene mineral separates and whole rocks from 21 xenolithic eclogites (11 low-MgO eclogites and 10 high-MgO eclogites) from the Koidu kimberlite complex, erupted within the Archean Man Shield, Sierra Leone, West Africa, provide new evidence bearing on the origin of cratonic eclogites. Garnet and clinopyroxene in both low-MgO and high-MgO eclogites generally record equilibrium inter-mineral Mg isotope partitioning, with ?26Mg varying from -2.15‰ to -0.46‰ in garnets and from -0.49‰ to +0.35‰ in clinopyroxenes. Bulk ?26Mg values (-1.38‰ to +0.05‰), constructed from garnet and clinopyroxene data, are similar to results from rock powders (-1.60‰ to +0.17‰), suggesting that kimberlite infiltration has had negligible influence on the Mg isotopic compositions of the xenoliths. The ?26Mg values of low-MgO eclogites (-0.80‰ to +0.05‰) exceed the range of mantle peridotite xenoliths (-0.25‰ ± 0.04‰), consistent with the eclogite’s derivation from recycled altered oceanic crust. Similarly variable ?26Mg values in high-MgO eclogites (-0.95‰ to -0.13‰), together with their high MgO and low FeO contents, suggest that high-MgO eclogites were produced by Mg-Fe exchange between partially molten low-MgO eclogites and surrounding peridotites. Our study shows that cratonic xenolithic eclogites preserve a record of Mg isotopic compositions produced by low-pressure, surficial isotope fractionations. The recycling of oceanic crust therefore increases the Mg isotope heterogeneity of the mantle.
DS201503-0178
2015
Wang, T., Song, X., Xia, H.H.Earth's core has a core.Nature Geoscience, Feb. 10, 3p. OnlineEarth, MantleGeophysics - seismic
DS201510-1814
2015
Wang, W.Preference in formation of H3 over H4 and its implication in gem diamond identification.GSA Annual Meeting, Paper 300-7, 1p. Abstract only BoothTechnologyHPHT

Abstract: Defects H3 and H4 are common in natural, HPHT treated, and artificially irradiated fancy colored diamonds. Understanding of their formation is important for color origin determination in gem labs. However, there are still substantial challenges. Davies (1972) studied the effect of different forms of nitrogen on the annealing of radiation damage, and found A/B = H3/H4. However, Collins (1982, 2001) pointed out that some natural type Ia diamonds could have H3 absorption but even when they contain substantial amounts of nitrogen in the B-form, the H4 absorption is negligible. In this study, based on investigation of a group of 39 (0.12 - 7.03 ct) natural green - yellow diamonds, vacancy source for formation H3 and H4 is identified and preference formation of H3 over H4 is discussed. Nitrogen concentrations of these diamonds fell in a range of 32- 496 ppm, with average 0.67 for B/(B+A). So, significant amount of B-form nitrogen exist. No irradiation feature of H1a, H1b, H1c, or 595 nm absorption was detected. Absorption spectra in the UV-Vis region were dominated by defects N3 and H3. Strong emission bands from H3 were observed, and its fluorescence substantially contributed to the body colors of green - yellow. As an outstanding feature, absorption or emission of defect H4 is entirely absent, despite significant concentrations of B-form nitrogen. Strong plastic deformation is a common feature in all samples. Green fluorescence from defect H3 clearly followed dislocation by showing up to 3 sets of parallel lines, instead of following growth zonation. These sharp lines are continuous throughout the whole stones. Strong dislocations indicated that these diamonds were originlly in brown color after the plastic deformation and thus with significant concentrations of vacancy clusters. Annealed in the earth’s mantle over a long geological history, single vacancies released from vacancy clusters could combine with the A-form nitrogen to form H3. Strong preference in forming H3 over H4 could be related to the unknown disaggregation process of vacancy clusters and the annealing in the earth’s mantle over long geological time. Absence of H4 in this type of diamonds could be considered as a useful indication of natural color origin.
DS201504-0229
2015
Wang, Y., Santosh, M., Lou, Z., Hao, J.Large igneous provinces linked to supercontinent assembly.Journal of Geodynamics, Vol. 85, pp. 1-10.GlobalGeotectonics
DS201502-0122
2015
Warnsloh, J.M.TriAngle: a microsoft excel spreadsheet template for the generation of triangular plots.Neues Jahrbuch fur Mineralogie, Vl. 192, 1, pp. 101-105.TechnologyPlots
DS201506-0298
2015
Watt, G.Coloured gemstone App. mayerandwatt.com, App freeTechnologyColoured gemstones
DS201509-0437
2015
Weiss, Y., McNeill, J., Pearson, D.G., Ottley, C.J.Highly saline fluids from a subducting slab as the source for fluid-rich diamonds.Nature, Vol. 524, pp. 339-342.MantleSubduction

Abstract: The infiltration of fluids into continental lithospheric mantle is a key mechanism for controlling abrupt changes in the chemical and physical properties of the lithospheric root1, 2, as well as diamond formation3, yet the origin and composition of the fluids involved are still poorly constrained. Such fluids are trapped within diamonds when they form4, 5, 6, 7 and so diamonds provide a unique means of directly characterizing the fluids that percolate through the deep continental lithospheric mantle. Here we show a clear chemical evolutionary trend, identifying saline fluids as parental to silicic and carbonatitic deep mantle melts, in diamonds from the Northwest Territories, Canada. Fluid–rock interaction along with in situ melting cause compositional transitions, as the saline fluids traverse mixed peridotite–eclogite lithosphere. Moreover, the chemistry of the parental saline fluids—especially their strontium isotopic compositions—and the timing of host diamond formation suggest that a subducting Mesozoic plate under western North America is the source of the fluids. Our results imply a strong association between subduction, mantle metasomatism and fluid-rich diamond formation, emphasizing the importance of subduction-derived fluids in affecting the composition of the deep lithospheric mantle.
DS201512-1986
2015
Weiss, Y., Pearson, D.G., Mcneill, J., Nowell, G.M., Ottley, C.J.Salty fluids, subducted slabs and NWT diamonds.43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 108.Canada, Northwest TerritoriesDiamond genesis

Abstract: Diamonds from the Ekati and Diavik mines have provided a wealth of information on diamond forming processes beneath the Slave craton. Fluid-rich “fibrous” diamonds trap some of the fluid from which the diamond is growing and hence provide a unique means to characterize directly the fluids that percolate through the deep continental lithospheric mantle. On a world-wide basis, Ekatic and Diavik fluid-rich diamonds trap an anomalously high proportion of fuids that are “salty” or high saline in composition, with high Na and Cl contents. The origin of these “salty” fluids has been something of a mystery. Here we show the first clear chemical evolutionary trend identifying saline fluids as parental to silicic and carbonatitic deep mantle melts, in diamonds from the Northwest Territories, Canada. Fluid-rock interaction along with in-situ melting cause compositional transitions, as the saline fluids traverse mixed peridotite-eclogite lithosphere. Moreover, the chemistry of the parental saline fluids - especially their Sr isotopic compositions - and the timing of host diamond formation suggest a subducting Mesozoic plate under western North America to be the source of the fluids. Our results imply a strong association between subduction, mantle metasomatism and fluid-rich diamond formation, emphasizing the importance of subduction-derived fluids in impacting the composition of the deep lithospheric mantle
DS201512-1987
2015
Wells, D.Diavik mine environment update,43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 108.Canada, Northwest TerritoriesDeposit - Diavik

Abstract: Since 2003 Diavik Diamond Mines Inc. has been mining diamonds from kimberlite pipes located below the waters of Lac de Gras. Monitoring and mitigating our impact on the local environment has been a core value at Diavik since our initial discovery. The mine was designed, and is operated, in a manner to reduce our overall environmental footprint and ultimately allow for a safe and efficient closure. A core team of scientists and technicians are responsible for monitoring the air, water, wildlife and regulatory compliance at the mine site. This presentation will focus on the work of this dedicated team.
DS201508-0380
2015
Whitchurch, A.Tectonics: continental complexity.Nature Geoscience, Vol. 8, p. 502.MantleLithosphere
DS201512-1988
2015
White, D., Bezzola, M., Hrkac, C., Vivian, G.Kennady North property: 2015 field season update.43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 109.Canada, Northwest TerritoriesDeposit - Kennady North

Abstract: The Kennady North Property, wholly owned by Kennady Diamonds Inc. (KDI) is located 300 km northeast of Yellowknife adjacent to the DeBeers/Mountain Province Gahcho Kué mine site. Exploration on the property dates back to the early 90’s, during which time several kimberlites were discovered. Since 2012 Kennady Diamonds has completed a number of geophysical, hand and RC till sampling and diamond drill programs. In 2015, KDI completed a large diameter reverse circulation drill program to bulk sample the southern lobe of the Kelvin kimberlite. Following the RC program, diamond drilling and ground geophysical surveys continued in the Kelvin-Faraday Corridor (KFC) and at various exploration targets on the property including the MZ Dyke and Doyle Sill. The field season started in January with the completion of the Kelvin camp and the construction of the RC drill icepad on Kelvin Lake. The pad and a seasonal spur road off the Gahcho Kue seasonal road were completed to coincide with the opening of the Tibbit-Contwoyto winter road and facilitated the mobilization of two large diameter RC rigs operated by Midnight Sun Drilling Inc. to the property. A total of 446 tonnes of the Kelvin kimberlite were obtained via RC drilling between February 19 and April 2. The bulk sample was processed via DMS at the Saskatchewan Research Council in Saskatoon. One diamond drill commenced drilling prior to the RC program and two other drills commenced on the heels of the RC program. A total of 31,000 meters of NQ and HQ core have been drilled during 2015 to the end of October. Drilling at Kelvin has focused on geotechnical and related environmental baseline work as well as further delineation of the pipe-like body with the aim of generating a NI43-101 compliant resource in early 2016. Diamond drilling at the Faraday group of kimberlites delineated the Faraday 1 and Faraday 2 kimberlites. These pipe-like bodies share a similar pipe-like structure and internal geology to the Kelvin kimberlite. Aurora conducted 8848 stations of ground gravity and 521.32 line-kilometers of OhmmapperTM capacitively coupled resistivity in the KFC, MZ dyke, and Doyle Sill during March and April. A 87 line-kilometer bubble seismic survey over the Kelvin, Faraday and MZ complexes was conducted in September. Kennady Diamond Inc. is very encouraged by the exploration results to date and anticipates a successful and exciting 2016.
DS201502-0123
2014
White, L., Graham, I., Armstrong, R., Hall, R.Tracing the source of Borneo's Cempaka deposit.American Geophysical Union, December - Fall meeting in San Francisco, abstractAsia, KalimantanDeposit - Cempaka
DS201508-0381
2015
Whitehead, J.A., Behn, M.D.The continental drift convection cell. Wilson Cycle)Geophysical Research Letters, Vol. 42, 11, June 16, pp. 4301-4308.GlobalConvection
DS201512-1989
2015
Williams-Jones, A.E.The hydrothermal mobility of the rare earth elements.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov. 13-14, pp. 119-124.TechnologyRare earths
DS201512-1990
2015
Williams-Jones, A.E., Vasyukova, O.Fluoride-silicate melt immisicibility and the formation of the pegmatite-hosted Strange Lake REE deposit, Quebec-Labrador.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov. 13-14, pp. 91-96.Canada, Quebec, LabradorRare earths
DS201512-1991
2015
Williams-Jones, A.E., Wollenberg, R., Bodeving, S.Hydrothermal fractionaction of the rare earth elements and the genesis of the Lofdal REE deposit, Namibia.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov. 13-14, pp. 125-130.Africa, NamibiaRare earths
DS201512-1992
2015
Winterburn, P.Exploration geochemistry: principles and practices for the strategic commodities Nb, Ta, Zr, and rare earth elements.Symposium on critical and strategic materials, British Columbia Geological Survey Paper 2015-3, held Nov. 13-14, pp. 193-198.TechnologyRare earths

Abstract: Geochemical exploration for Nb, Ta, Zr and rare earth element (REE) mineralization associated with carbonatite, pegmatite, and peralkaline intrusions presents unique challenges and opportunities. The challenges are mainly due to the tendency of these elements, as High Field Strength Elements (HFSE), to be relatively immobile in surface environments in addition to commonly forming minerals that are resistant to weathering. In addition, many of the host minerals are resistant to routine exploration geochemistry digestions, which are typically aimed at dissolving soluble oxides or extracting more labile ionic forms (Reimann et al., 2014). Opportunities arise because host rocks typically represent relatively rare end products of the magmatic processes that generate peralkaline magmas including, at the far end of the spectrum, carbonatites. Hence host rocks are relatively easy to identify geochemically and commonly defi ne classic lithological zoning (e.g., Modreski et al., 1995). In addition, many of the minerals that contain these elements are resistant to weathering, mechanically durable, have relatively high densities, and have the have the potential to form heavy mineral concentrates when released by weathering. This is particularly so for Zr, Nb, and Ta, which form primary minerals such as tantalite (Ta Nb), pyrochlore (Nb), coltan (Ta Nb), columbianite (Ta Nb), dysanalite-perovskite (Nb) and zircon (Zr). In contrast, the REE are mobile in the weathering environment and commonly re-locate from primary carbonate and phosphate minerals (e.g., synchysite, monazite, xenotime, bastnäsite, allanite) to secondary phosphate minerals such as churchite (Lottermoser, 1990) and gorceixite (Mariano, 1989).
DS201509-0438
2015
Witherly, K.Backgrounder on award for HT SQUID development ( Cathy Foley and Keith Leslie) Clunies Ross award for inovation.ken @condorconsult.com, 2p. Aug. 15Geophysics - SQUID
DS201511-1887
2015
Wolff, F.C.Does price dispersion increase with quality? Evidence from the online diamond market ( using 160,000 dat a statistics) from www.diamond-infos.com)Applied Economics, Vol. 47, 11, pp. 5996-6009.GlobalDiamond market ( online)

Abstract: This article empirically investigates the relationship between price dispersion and price level. Searches seem more valuable for products of high quality, but buyers may have little incentive to search since such products are less frequently purchased. The extent of price dispersion is examined using a sample of around 160 000 diamonds offered for sale online. Estimates from a two-stage econometric strategy show that price dispersion increases significantly with quality. An explanation is that buyers of high-quality gemstones pay little attention to the price of these diamonds and even more so if they perceive high prices as signals of quality and rarity of the diamonds they intend to purchase.
DS201507-0340
2015
Womp-int.comNew Culli nan facility will improve diamond recovery, cut costs.Womp-int.com, 1p.Africa, South AfricaDeposit - Cullinan
DS201506-0299
2015
World Diamond MagazineDiamond grading standards.World Diamond Conference Nov. 23, Perth, Free subscription email communications @worlddiamondmark .orgTechnologyDiamond grading
DS201511-1888
2002
Wortman, J.GMP Junior diamond companies ….. Overview not much informationGMP Group, March 15, 54p. Available pdfGlobalMicrodiamonds - responses
DS201502-0124
2014
Wu, F.Y., Xu, Y., Zhu, X., Zhang, G.W.Thinning and destruction of the cratonic lithosphere: a global perspective.Science China Earth Sciences, Vol. 57, no. 12, pp. 2878-2890.China, GlobalPlume, subduction
DS201512-1993
2015
Wu, N.W., Schmitt, A.K., Pappalardo, L.U-Th baddeleyite geochronology and its significance to date the emplacement of silica undersaturated magmas.American Mineralogist, Vol. 100, pp. 2082-2090.MantleMagmatism

Abstract: Baddeleyite is a frequently found accessory mineral in silica undersaturated lavas. Because it is typically enriched in uranium, while having low initial lead, baddeleyite has long been a prime target for U-Pb geochronology of mafic rocks. The difficulties in retrieving small baddeleyite grains from volcanic samples and the lack of a detailed understanding of baddeleyite occurrence, however, have limited baddeleyite chronology largely to coarse-grained mafic intrusive rocks. Here, the development of U-Th in situ baddeleyite analysis using secondary ionization mass spectrometry (SIMS) is presented together with an assessment of baddeleyite occurrence in Quaternary silica-undersaturated lavas from Campi Flegrei (Naples, Italy). Samples studied comprise the pre- and post Campanian Ignimbrite (ca. 40 ka) lava domes of Cuma and Punta Marmolite, and Astroni and Accademia, respectively. The in situ sample preparation required initial identification of baddeleyite crystals from sawed and polished rock billets using scanning electron microscope (SEM) backscatter imaging and energy-dispersive X-ray analysis. U-Th baddeleyite isochron ages for intra-caldera Astroni and Accademia lava domes are 5.01+2.61?2.55 ka (MSWD = 2.0; n = 17) and 4.36+1.13?1.12 ka (MSWD = 2.9; n = 24), respectively. The ages for Punta Marmolite (62.4+3.9?3.8 ka; MSWD = 1.2; n = 11) and Cuma (45.9+3.6?3.5 ka; MSWD = 2.2; n = 11) predate the Campanian Ignimbrite. Rapid baddeleyite crystallization at the time of emplacement is supported by petrologic observations that >50% of the baddeleyite crystals documented in this study occur either in vesicles or in vesicle-rich regions of the host lavas whose textures developed over timescales of a few years to a few decades based on microlite crystal size distribution (CSD) analysis. Radiometric U-Th baddeleyite ages are mostly in agreement with previously determined K-Ar eruption ages, except for the Punta Marmolite lava dome whose U-Th baddeleyite age predates the K-Ar age by ca. 15 ka. Baddeleyite thus records eruptive emplacement with little evidence for significant pre-eruptive crystal residence, and has potential as an eruption chronometer for Quaternary silica-undersaturated volcanic rocks.
DS201506-0300
2015
Wu, Xiao, Xu, Santosh, Li, Huang, Hou.Geochronology and geochemistry of felsic xenoliths in lamprophyre dikes from the southeastern margin of the North Chin a Craton: implications for the interleaving of the Dabie Sulu orogenic crust.International Geology Review, Vol. 57, 9-10, pp. 1305-1325.ChinaDabie Sulu
DS201507-0341
2015
Wyman, D.A., Hollings, P., Conceicao, R.V.Geochemistry and radiogenic isotope characteristics of xenoliths in Archean Diamondiferous lamprophyres: implications for the Superior Province cratonic keel.Lithos, Vol. 233, pp. 111-130.Canada, OntarioLamprophyre
DS201508-0382
2015
Xie, Y., Li, Y., Hou, Z., Cooke, D.R., Danyushevsky, L., Dominy, S.C., Yin, S.A model for carbonatite hosted REE mineralization - the Mianning-Dechang REE belt, western Sichuan Province, China.Ore Geology Reviews, Vol. 70, pp. 595-612.ChinaCarbonatite
DS201504-0231
2015
Xiong, Q., Griffin, W.L., Zheng, J-P., O'Reilly, S.Y., Pearson, N.J.Episodic refertilization and metasomatism of Archean mantle: evidence from an orogenic peridotite in North Qaidam ( NE Tibet) China.Contributions to Mineralogy and Petrology, Vol. 169, 24p.China, TibetPeridotite
DS201510-1815
2015
Xu, S., Liu, Y., Chen, G., Ji, S., Ni, P., Xiao, W.Microdiamonds, their classification and tectonic implications for the host eclogites from the Dabie and Su-Lu regions in central eastern China.Mineralogical Magazine, Vol. 69, 4, pp. 590-520.ChinaUHP

Abstract: We have found >10 in situ microdiamonds in thin sections of eclogites from the Dabie and Su-Lu regions of central eastern China since the first occurrence of microdiamond in eclogites from the Dabie Mountains (DMT) reported in 1992. The microdiamonds are found not only in the central part but also in the northern part of the DMT. Several free crystals have been recovered from the crushed eclogites from the central DMT. Most in situ microdiamonds are inclusions in garnets but a few larger ones are intergranular. Most of the diamondiferous eclogites in the central part of the DMT are associated with coesite. Most importantly, the observation of microdiamonds in northern Dabie lead us to question the supposition that this is a low-P metamorphic terrane. All the diamondiferous eclogites from both the north and central DMT are of continental affinity as demonstrated by their negative ?Nd values. Therefore, both the north and central eclogite belts in the DMT are considered to be from the deep subducted terrane. Five in situ microdiamonds and two free crystals are first reported in this paper. The dimensions of the in situ microdiamonds are 30-80 ?m and the free crystals are up to 400–-00 ?m across. All the microdiamonds are confirmed as such by Raman spectroscopy. The results of an infrared spectroscopic investigation on two larger free crystals and two in situ microdiamonds show that all the microdiamonds from both the Dabie and Su-Lu regions are mixed types IaA and IaB diamonds and there is no indication of any synthetic microdiamonds in our samples because such synthetic microdiamonds are always rich in type Ib.
DS201512-1994
2015
Yang, J., Dilek, Y., Robinson, P.T.Diamond and recycled mantle: a new perspectve - introduction of IGCP 649 project. OphiolitesActa Geologica Sinica, Vol. 89, 3, pp. 1036-1038.MantleDiamond genesis
DS201502-0126
2014
Yang, J., Meng, F., Xu, X., Robinson, P.T., Dilek, Y., Makeyev, A.B., Wirth, R., Wiedenbeck, M., Cliff, J.Diamonds, native elements and metal alloys from chromitites of the Ray-Iz ophiolite of the Polar Urals.Gondwana Research, Vol. 27, 2, pp. 459-485.Russia, UralsChromitite
DS201510-1816
2015
Yang, J-S., Wirth, R., Xu, X., Tian, Y., Huang, Z., Robinson, P.T., Dilek, Y.Formation of ophiolite hosted diamonds by deep subduction of oceanic lithosphere: evidence from mineral inclusions.GSA Annual Meeting, Paper 81-2, 1p. Abstract onlyMantleMineral inclusions

Abstract: In recent years we have confirmed the existence of ophiolite-hosted diamonds on Earth, which occur in mantle peridotites and podiform chromitites of many ophiolites. These diamonds differ significantly from most kimberlite varieties, particularly in their inclusions. The typical inclusions in the diamonds are Mn-rich phases, i.e., NiMnCo alloy, native Mn, MnO, galaxite, Mn olivine and Mn garnet. Ca-silicate perovskite, a typical lower mantle mineral, was identified as mineral inclusions in diamond. One occurs as a 60-nanometer, euhedral grain associated with NiMnCo alloy and graphite, while another one occurs as a 50-nanometer grain within a large inclusion containing both NiMnCo alloy and Nd-Se-Cu-S phase. By EDS the perovskite has Ca 48.3%, Si 37.7% and Mn 14.1% with oxygen. TEM diffraction data show that the inclusion has d-spacings and angles between adjacent lattice planes are consistent to the Ca-silicate perovskite with an orthorhombic structure. The only known source of such light carbon is organic material in surface sediments and the best known sources of abundant manganese are Fe-Mn-rich sediments and Mn nodules, both of which are common on the seafloor. Many parts of the modern seafloor are also covered by sediments with a continental provenance. Phases such as SiO2 and Al2O3 are not expected in mantle peridotites and must have been introduced from shallow levels. We propose that subduction of oceanic lithosphere carries C, Mn, Si, Al and REE to the transition zone or lower mantle where the material is mixed with highly reduced material, perhaps derived from greater depths. Crystallization of diamond from a C-rich fluid encapsulates the observed inclusions. The diamonds and associated minerals are incorporated into chromite grains during chromite crystallization at depth of mantle transition zone, and are carried to shallower levels by mantle convection. Accumulation of chromite grains produces podiform chromitites containing a range of exotic minerals. However, the presence of diamonds and other UHP minerals in ophiolitic peridotites indicates that such phases can persist far outside their normal stability fields.
DS201512-1995
2015
Yang, X.OH solubility in olivine in the peridotote-COH system under reducing conditions and implications for water storage and hydrous melting in the reducing upper mantle.Earth and Planetary Science Letters, Vol. 432, pp. 199-209.MantleMelting

Abstract: Experimental studies of OH solubility in peridotite minerals are of crucial importance for understanding some key geochemical, geophysical and geodynamical properties of the upper mantle. In reducing depths of the upper mantle, C-O-H fluids are dominated by CH4 and H2O. However, available experimental H-annealing of olivine concerning water storage capacity in the reducing upper mantle has been exclusively carried out by equilibrating olivine with H2O only. In this study, OH solubility in olivine has been investigated by annealing natural olivine crystals under peridotite-bearing and CH4-H2O-present conditions with piston cylinder and multi-anvil apparatus. Experiments were performed at 1-7 GPa and 1100-1350?°C and with oxygen fugacity controlled by Fe-FeO buffer, and OH solubilities were measured from polarized infrared spectra. The olivines show no change in chemical composition during the experiments. The infrared spectra of all the annealed olivines show OH bands in the range 3650-3000 cm?1, at both high (>3450 cm?1) and low (<3450 cm?1) frequency, and the bands at ?3400-3300 cm?1 are greatly enhanced above ?3 GPa and 1300?°C. The determined H2O solubility is ?90-385 ppm for the olivine coexisting with H2O (1-7 GPa and 1100?°C), and is ?40-380 ppm for the olivine coexisting with CH4-H2O (1-7 GPa and 1100-1350?°C). When CH4 is present in the equilibrium fluid, the H2O solubility is reduced by a factor of ?2.3 under otherwise identical conditions, indicating a strong effect of CH4 on the partitioning of water between olivine and coexisting fluid. The storage capacity of water in the reducing upper mantle is, modeled with the measured solubility of olivine and available partition coefficients of water between coexisting minerals, up to ?2 orders of magnitude lower than some previous estimates. Considering the temperature along the geotherm in the reducing oceanic upper mantle, the required H2O concentration to trigger hydrous melting is 250 and 535 ppm at ?100 and 210 km depth, respectively, and is even larger at greater depths. These values exceed the typical H2O abundance (?100±50 ppm?100±50 ppm) in the upper mantle, suggesting that pervasive hydrous melting at reducing depths of the oceanic upper mantle is not likely. Similar arguments may also be casted for the reducing deep upper mantle in the continental regions.
DS201512-1996
2015
Yang, X., Williams, M.Landforms and processes in arid and semi-arid environments.Catena, Vol. 134, pp. 4-13.Africa, South Africa, AustraliaGeomorphology
DS201511-1889
2015
Yap, C.M., Tarum, A., Xiao, S., Misra, D.S.MPCVD growth of 13 C-enriched diamond single crystals with nitrogen addition.Diamond and Related Materials, in press available, 29p.TechnologySynthetics - nitrogen

Abstract: This study describes the growth of 13C-enriched (100)-oriented diamond single crystals by the MPCVD (microwave plasma chemical vapour deposition) process. All crystals are at least 6 × 6 mm2 in area and 0.5-1.0 mm in thickness. The samples with nominal 13C percentages (R = [13C] / [13C + 12C]) of 0.011 (natural abundance), 0.10, 0.21, 0.24 and 0.34 were obtained by controlling the flow of the carbon-13 and carbon-12 methane feed gases. To obtain thicker and near-colourless quality 13C-enriched diamond, 190 ppm of nitrogen was added into the gas mixture. The shift towards lower frequency in the Raman peak positions and decrease in the thermal conductivities of the near-colourless crystals with increasing 13C percentages are similar to previous studies of isotopically-controlled diamond grown with no nitrogen additive. The images of the structural defects associated with 13C-enrichment obtained by spatially-resolved X-ray rocking curve measurement show distinct patterned structures that runs parallel to the < 100 > direction. Moreover, the broadening in the line width of the nuclear magnetic resonance (NMR) peak from sp313C correlates with increasing R. We also expand the study by injecting 500 ppm of nitrogen. Higher nitrogen concentration leads to the formation of brown crystals. The brown crystals show far greater 13C NMR peak intensity than the near-colourless. This suggests that paramagnetic nitrogen impurities in the brown crystals hasten the spin-lattice relaxation time of the 13C nuclear spin that resulted in higher intensity. The isotopic splitting observed for the localized vibrational mode of the NVH0 defect in brown crystals is attributed to the co-existence of both the 13C (3114.2 cm? 1) and 12C (3123.5 cm? 1). Unlike the isotopic splitting observed for NVH0 defect, the peak position of the Ns+ defect shifts towards lower frequency as R increases. Not only have we demonstrate the growth of bigger isotopically-controlled diamond single crystals, the results shown here have provided a framework to further investigate the interplay between 13C atoms and nitrogen impurity.
DS201509-0439
2015
Yelisseyev, A., Khrenov, A., Afanasiev, V., Pustovarov, V., Gromilov, S., Panchenko, A., Pokhilenko, N., Litasov, K.Luminescence of natural carbon nanomaterial: impact diamonds from the Popigai crater.Diamond and Related Materials, Vol. 58, pp. 69-77.RussiaDeposit - Popigai

Abstract: Impact diamonds (IDs) from the Popigai crater are aggregates of nanoparticulate graphite and cubic and hexagonal diamonds. IDs demonstrate broad-band emissions at 3.05, 2.8, 2.3 and 2.0 eV, which are associated with structural defects and are similar to those in detonation ultra-dispersed diamonds and CVD diamond films. A doublet with components at 1.7856 and 1.7892 eV in some ID samples is related to R1,2 lines of Cr3 + ions in corundum inclusions. The presence of N3, H3, NV0 and NV? vibronic systems in some of the ID samples shows that (i) there is nitrogen impurity and (ii) samples underwent high temperature annealing that promoted vacancies and nitrogen diffusion and defect aggregation. The luminescence decay fits with a sum of two exponential components: lifetime of the fast one is in the 5 to 9 ns range. Parameters of the traps responsible for broad thermoluminescence peaks at 148, 180, 276 and 383 K were estimated.
DS201511-1890
2015
Yip, C.K., Thompson, K.S.Diavik Diamond Mines Inc. NI 43-101 Technical Report.Diavik Diamond Mines Inc., March 18, 128p. Available pdfCanada, Northwest TerritoriesMicrodiamonds - responses
DS201502-0127
2015
You, J.Geoscientists aim to magnify specialized web searching. GeoLink could become search hub for the geoscience community.Sciencemag.org, Vol. 347, 6217 Jan. 2, p. 11 ( 1p)TechnologyGeoLink
DS201510-1817
2015
Yu, J., LU, R.Color shift and pleochroism in Tanzanite.GSA Annual Meeting, Paper 300-6, 1p. Abstract only BoothTechnologyTanzanite

Abstract: Colored stones are increasingly accepted in China gem market in recent years. Tanzanite owing to its unique violetish blue color is readily recognized and attracts broad attention. Natural, unheated blue tanzanite is known for its trichroic colors in bluish violet, violetish blue, yellow-green. Much lesser known, tanzanite also exhibits metachromatism, a color shift, when illuminated by cold and warm light sources. However, limited existing reports and studies have been mostly descriptive on general gem deposit and basic gemological characteristics. Very little data exit on color shift and pleochroism distinctive to tanzanite. Quantitative analysis on these color characteristics under heating virtually is lacking, even though over 95% tanzanite materials on gem market are reported to have been heated to improve its appearance. This study presents direct observational results on color shift with controlled warm (`3200K) and cold (`6500K) light sources under polarization and known crystallographic orientations. Further quantitative analysis have been performed by polarized spectroscopic measurement on trichroic to dichroic color conversion in tanzanite samples from a set of heating experiments between 650 and 900 °C. Optimal heating temperature for these experiments was determined by thermal analysis (TG-DTA), which showed that tanzanite became unstable above 960 °C. Our optical observation and quantitative results revealed that a yellow-green coloration along the c-crystallographic direction converted and virtually merged into existing blue coloration after heating. Consequently, tanzanite converted from natural, unheated trichroic to heated dichroic.
DC201511-2373
2015
Yu, Y., Liu, K.H., Reed, C.A., Moidaki, M., Mickus, K., Atekwana, E.A., Gao, S.S.Canterra closes first tranche of private placement and extends financing. Canterra Minerals Corporation, Oct. 20, 1p.Canada, Northwest TerritoriesNews item - press release
DS201512-1997
2015
Yu, Y., Liu, K.H., Reed, C.A., Moidaki, M., Mickus, K., Atekwana, E.A., Gao, S.S.A joint receiver function and gravity study of crustal structure beneath the incipient Okavango Rift, Botswana.Geophysical Research Letters, Vol. 42, 20, pp. 8398-8405.Africa, BotswanaGeophysics - gravity

Abstract: Rifting incorporates the fundamental processes concerning the breakup of continental lithosphere and plays a significant role in the formation and evolution of sedimentary basins. In order to decipher the characteristics of rifting at its earliest stage, we conduct the first teleseismic crustal study of one of the world's youngest continental rifts, the Okavango Rift Zone (ORZ), where the magma has not yet breached the surface. Results from receiver function stacking and gravity modeling indicate that the crust/mantle boundary beneath the ORZ is uplifted by 4-5 km, and the initiation of the ORZ is closely related to lithospheric stretching. Possible decompression melting of the subcrustal lithosphere occurs beneath the ORZ, as evidenced by a relatively low upper mantle density based on the gravity modeling.
DS201511-1891
2015
Yuan, H.Secular changes in Archean crust formation recorded in western Australia.Nature Geoscience, Vol. 8, 10, pp. 808-813.AustraliaGeophysics - seismics, subduction

Abstract: The formation mechanisms for early Archaean continental crust are controversial. Continental crust may have accumulated via horizontal accretion in modern-style subduction zones or via vertical accretion above upper mantle upwelling zones. However, the characteristics of the continental crust changes at the transition between the Archaean and Proterozoic eons, suggesting that continental crust did not form in subduction zones until at least the late Archaean. Here I use seismic receiver function data to analyse the bulk properties of continental crust in Western Australia, which formed and stabilized over a billion years in the Archaean. I find that the bulk seismic properties of the crust cluster spatially, with similar clusters confined within the boundaries of tectonic terranes. I use local Archaean crustal growth models to show that both plume and subduction processes may have had a role in creating crust throughout the Archaean. A correlation between crustal age and the bulk seismic properties of the crust reveals a trend: from about 3.5?Gyr ago (Ga) to the end of the Archaean, the crust gradually thickened and simultaneously became more evolved in composition. I propose that this trend reflects the transition between crust dominantly formed above mantle plumes, to crust formed in subduction zones-a transition that may reflect secular cooling of Earth’s mantl
DS201509-0440
2015
Yuryeva, O.P., Rakhmanova, M.I., Nadolinny, V.A., Zedgenizov, D.A., Shatsky, V.S., Kagi, H., Komarovskikh, A.Yu.The characteristic photoluminescence and EPR features of superdeep diamonds ( Sao Luis, Brazil).Physics and Chemistry of Minerals, In press available 16p.South America, Brazil, Mato GrossoDeposit - Juina area

Abstract: Photoluminescence (PL) spectroscopy and electron paramagnetic resonance (EPR) were used for the first time to characterize properties of superdeep diamonds from the São-Luis alluvial deposits (Brazil). The infrared measurements showed the low nitrogen content (>50 of 87 diamonds from this locality were nitrogen free and belonged to type IIa) and simultaneously the extremely high level of nitrogen aggregation (pure type IaB being predominant), which indicates that diamonds under study might have formed under high pressure and temperature conditions. In most cases, PL features excited at various wavelengths (313, 473, and 532 nm) were indicative of different growth and post-growth processes during which PL centers could be formed via interaction between vacancies and nitrogen atoms. The overall presence of the 490.7 nm, H3, and H4 centers in the luminescence spectra attests to strong plastic deformations in these diamonds. The neutral vacancy known as the GR1 center has probably occurred in a number of crystals due to radiation damage in the post-growth period. The 558.5 nm PL center is found to be one of the most common defects in type IIa samples which is accompanied by the EPR center with g-factor of 2.00285. The 536 and 576 nm vibronic systems totally dominated the PL spectra of superdeep diamonds, while none of "normal" diamonds from the Mir pipe (Yakutia) with similar nitrogen characteristics showed the latter three PL centers.
DS201511-1892
2015
Yuryeva, O.P., Rakhmanova, M.I., Nadolinny, V.A., Zedgenizov, D.A., Shatsky, V.S., Kagi, H., Komarovskikh, A.Yu.The characteristic photoluminescence and EPR features of superdeep diamonds ( Sao-Luis, Brazil).Physics and chemistry of Minerals, Vol. 42, 9, pp. 707-722.South America, BrazilSao-Luis alluvials

Abstract: Photoluminescence (PL) spectroscopy and electron paramagnetic resonance (EPR) were used for the first time to characterize properties of superdeep diamonds from the São-Luis alluvial deposits (Brazil). The infrared measurements showed the low nitrogen content (>50 of 87 diamonds from this locality were nitrogen free and belonged to type IIa) and simultaneously the extremely high level of nitrogen aggregation (pure type IaB being predominant), which indicates that diamonds under study might have formed under high pressure and temperature conditions. In most cases, PL features excited at various wavelengths (313, 473, and 532 nm) were indicative of different growth and post-growth processes during which PL centers could be formed via interaction between vacancies and nitrogen atoms. The overall presence of the 490.7 nm, H3, and H4 centers in the luminescence spectra attests to strong plastic deformations in these diamonds. The neutral vacancy known as the GR1 center has probably occurred in a number of crystals due to radiation damage in the post-growth period. The 558.5 nm PL center is found to be one of the most common defects in type IIa samples which is accompanied by the EPR center with g-factor of 2.00285. The 536 and 576 nm vibronic systems totally dominated the PL spectra of superdeep diamonds, while none of "normal" diamonds from the Mir pipe (Yakutia) with similar nitrogen characteristics showed the latter three PL centers.
DS201505-0239
2015
Zahirovic, S., Muller, R.D., Seton, M., Flament, N.Tectonic speed limits from plate kinematic reconstructions.Earth and Planetary Science Letters, Vol. 418, pp. 40-52.GlobalPlate Tectonics
DS201506-0301
2015
Zedgenizov, D.A., Pokhilenko, N.P., Griffin, W.L.Carbonate- silicate composition of diamond forming media of fibrous diamonds from Snap Lake area, Canada.Doklady Earth Sciences, Vol. 461, 1, pp. 297-300.Canada, Northwest TerritoriesMicro-inclusions
DS201502-0128
2015
Zedgenizov, D.A., Shatsky, V.S., Panin, A.V., Evtushenko, O.V., Ragozin, A.L., Kagi, H.Evidence for phase transitions in mineral inclusions in superdeep diamonds of the Sao Luiz deposit, Brazil.Russian Geology and Geophysics, Vol. 56, 1, pp. 296-305.South America, BrazilDeposit - Sao Luiz
DS201510-1818
2015
Zhao, D., Zhang, Y., Essene, E.J., Wang, R.Electron probe microanalysis and microscopy: principles and applications in characterization of mineral inclusions in chromite from diamond deposit.Ore Geology Reviews, Vol. 65, pt. 4, pp. 733-748.ChinaDeposit - Wafangdian

Abstract: Electron probe microanalysis and microscopy is a widely used modern analytical technique primarily for quantifying chemical compositions of solid materials and for mapping or imaging elemental distributions or surface morphology of samples at micrometer or nanometer-scale. This technique uses an electromagnetic lens-focused electron beam, generated from an electron gun, to bombard a sample. When the electron beam interacts with the sample, signals such as secondary electron, backscattered electron and characteristic X-ray are generated from the interaction volume. These signals are then examined by detectors to acquire chemical and imaging information of the sample. A unique part of an electron probe is that it is equipped with multiple WDS spectrometers of X-ray and each spectrometer with multiple diffracting crystals in order to analyze multiple elements simultaneously. An electron probe is capable of analyzing almost all elements (from Be to U) with a spatial resolution at or below micrometer scale and a detection limit down to a few ppm. Mineral inclusions in chromite from the Wafangdian kimberlite, Liaoning Province, China were used to demonstrate the applications of electron probe microanalysis and microscopy technique in characterizing minerals associated with ore deposits, specifically, in this paper, minerals associated with diamond deposit. Chemical analysis and SE and BSE imaging show that mineral inclusions in chromite include anhydrous silicates, hydrous silicates, carbonates, and sulfides, occurring as discrete or single mineral inclusions or composite multiple mineral inclusions. The chromite–olivine pair poses a serious problem in analysis of Cr in olivine using electron probe. Secondary fluorescence of Cr in chromite by Fe in olivine drastically increases the apparent Cr2O3 content of an olivine inclusion in a chromite. From the chemical compositions obtained using electron probe, formation temperatures and pressures of chromite and its mineral inclusions calculated using applicable geothermobarometers are from 46 kbar and 980 °C to 53 kbar and 1130 °C, which are within the stability field of diamond, thus Cr-rich chromite is a useful indication mineral for exploration of kimberlite and diamond deposit. A composite inclusion in chromite composed of silicate and carbonate minerals has a bulk composition of 33.2 wt.% SiO2, 2.5 wt.% Al2O3, 22.0 wt.% MgO, 7.5 wt.% CaO, 2.5 wt.% BaO, 0.8 wt.% K2O, 25.5 wt.% CO2, and 0.8 wt.% H2O, similar to the chemical composition of the Wafangdian kimberlite, suggesting that it is trapped kimberlitic magma.
DS201511-1893
2015
Zhao, X., Shi, G., Zhang, J.Review of lithospheric diamonds and their mineral inclusions.Advances in Earth Science *** Chinese ( eng. Abstract only), Vol. 30, 3, pp. 310-322.MantleDiamond inclusions

Abstract: Diamonds and their mineral inclusions are valuable for studying the genesis of diamonds, the characteristics and processes of ancient lithospheric mantle and deeper mantle. This has been paid lots of attentions by geologists both at home and abroad. Most diamonds come from lithospheric mantle. According to their formation preceded, accompanied or followed crystallization of their host diamonds, mineral inclusions in diamonds are divided into three groups: protogenetic, syngenetic and epigenetic. To determine which group the mineral inclusions belong to is very important because it is vital for understanding the data’s meaning. According to the type of mantle source rocks, mineral inclusions in diamonds are usually divided into peridotitic (or ultramafic) suite and eclogitic suite. The mineral species of each suite are described and mineralogical characteristics of most common inclusions in diamonds, such as olivine, clinopyroxene, orthopyroxene, garnet, chromite and sulfide are reviewed in detail. In this paper, the main research fields and findings of diamonds and their inclusions were described: ?getting knowledge of mineralogical and petrologic characteristics of diamond source areas, characteristics of mantle fluids and mantle dynamics processes by studying the major element and trace element compositions of mineral inclusions; ?discussing deep carbon cycle by studying carbon isotopic composition of diamonds; ?determining forming temperature and pressure of diamonds by using appropriate assemblages of mineral inclusions or single mineral inclusion as geothermobarometry, by using the abundance and aggregation of nitrogen impurities in diamonds and by measuring the residual stress that an inclusion remains under within a diamond ; ?estimating the crystallization ages of diamonds by using the aggregation of nitrogen impurities in diamonds and by determine the radiometric ages of syngenetic mineral inclusions in diamonds. Genetic model of craton lithospheric diamonds and their mineral inclusion were also introduced. In the end, the research progress on diamonds and their inclusions in China and the gap between domestic and international research are discussed.
DS201501-0034
2015
Zheng, J.P., Lee, C.T.A., Lu, J.G., Zhao, J.H., Wu, Y.B., Xia, B., Li, X.Y., Zhang, J.F., Liu, Y.S.Refertilization driven destabilization of subcontinental mantle and the importance of initial lithospheric thickness for the fate of continents. Earth and Planetary Science Letters, Vol. 409, pp. 225-229.ChinaPeridotite
DS201511-1894
2014
Zhonghua, S., Taijin, L., Meidong, S., Jun, S., Jing, D., Xikuan, Z.Coated and fracture filled coloured diamond.Australian Gemmologist, Vol. 24, 2, pp. 41-43.TechnologyDiamond morphology
DS201511-1895
2014
Zhonghua, S., Taijin, L., Meidong, S., Jun, S., Jingjing, S.High quality synthetic yellow orange diamond emerges in China.Australian Gemmologist, Vol. 24, 7, pp. 167-170.ChinaSynthetics
DS201506-0302
2015
Zhu, H., Yang, J., Robinson, P.T., Zhu, Y., Zhu, F., Zhao, X., Liu, Z., Zhang, W., Xu, W.The discovery of diamonds in chromitites of the Hegenshan ophiolite, Inner Mongolia, China.Acta Geologica Sinica, Vol. 89, 2, pp. 341-350.China, MongoliaChromitite
DS201502-0129
2014
Zhu, L-F., Wang, X-f., Pan, X.Moving KML geometry elements within Google Earth.Computers & Geosciences, Vol. 72, pp. 176-183.TechnologyNot specific to diamonds
DS201502-0130
2015
Zhu, X-k., Sun, J., Pan, C.Sm-Nd isotopic constraints on rare earth mineralization in the Bayan Obo ore deposit, Inner Mongolia, China.Ore Geology Reviews, Vol. 64, pp. 543-553.ChinaDeposit - Bayan Obo
DS201501-0035
2014
Zhu, Y., Cuma, M., Kinakin, Y., Zhdanov, M.S.Joint inversion of airborne gravity gradiometry and magnetic dat a from the Lac de Gras region of the Northwest Territories.SEG Annual Meeting Denver, 5p. Extended abstractCanada, Northwest TerritoriesDeposit - Lac de Gras region
DM201504-1377
2015
Zimnisky, P.Global diamond output to rise in 2015.London Mining Journal, Special publication for PDAC pp. 17,18,20,21.GlobalNews item - overview
DM201508-1378
2015
Zimnisky, P.Rough diamonds down 3.4% over last 6 months according to new rough diamond price index.Zimnisky.com, July 9, 2p.GlobalNews item - prices
DM201512-2324
2015
Zimnisky, P.The state of the diamond industry going into year-end 2015. Mining.com, Nov. 5, 6p.GlobalNews item - markets
DM201512-2325
2015
Zimnisky, P.Zimnisky global rough diamond price index (.ZGRDIA)paulzimnisky.com, Nov. 21, 2p.GlobalNews item - prices
DS201503-0182
2015
Zimnisky, P.Global rough diamond production estimated to hot over 135 m carats in 2015.Diamond analytics, paul @paulzimnisky.com, Feb. 6, 14p.Production figures
DC201509-1755
2015
Zimtu Capital CorporationCommences exploration program at the Munn Lake property.Zimtu Capital Corporation, Aug. 25, 3p.Canada, Northwest TerritoriesNews item - press release
DS201512-1998
2015
Zorzi, L., Crawford, B., Ferguson, K.Geological and structural interpretation of the Jay kimberlite host rocks.43rd Annual Yellowknife Geoscience Forum Abstracts, abstract p. 110.Canada, Northwest TerritoriesDeposit - Jay

Abstract: The Ekati property is located above an eastward-dipping Archean suture in the central part of the Slave Structural Province of the Canadian Shield. The bedrock geology comprises supracrustal rocks (metamorphosed greywacke-mudstone turbidites) of the Neoarchean post-Yellowknife Supergroup that are intruded by syn to post-tectonic plutons, made up predominantly of granite, granodiorite, and tonalite. In addition, five mafic Proterozoic dyke swarms, ranging in age from ca. 2.23 to 1.27 Ga, intrude the area. The area is intersected by several mafic dykes, belonging mainly to the Malley, MacKenzie, and Lac de Gras dyke swarms. To date, approximately 150 kimberlites have been discovered at Ekati ranging in age from ca. 45 to 75 Ma, intruding Archean metasediments and granitoids of the Salve Craton. In addition to the 150 kimberlites on the Ekati property, more than 240 confirmed kimberlites have been discovered to date in the region known as the Lac de Gras kimberlite field. The kimberlites represent the only evidence for Phanerozoic igneous activity within the area. Kimberlites on the Ekati property show an apparent bias in the type of host rock they intrude and are commonly associated with faults or dykes of various orientations. The Jay kimberlite pipe is located in the southeastern quadrant of the Ekati property. It is approximately 25 km southeast of the Koala cluster (including Panda, Koala, Koala North and Beartooth kimberlite pipes), and 7 km north-northeast of the Misery Main pipe. Based on available geological data consisting of geophysical surveys, geological maps and borehole data, the Jay kimberlite pipe appears to be hosted within post- Yellowknife Supergroup granitic rocks, ranging from granite to granodiorite in composition. It is interpreted to be emplaced along a regional lithological contact between granitoid rocks and Yellowknife Supergroup metasedimentary rocks that were covered by a now eroded veneer of poorly consolidated muddy sediments. A diabase dyke trending approximately east-west occurs to the north of the Jay kimberlite pipe. Despite the available data, geological and structural settings of the Jay host rocks were still not well understood. This work represents the first comprehensive geological interpretation of the host rocks within the Jay pipe setting. The proposed interpretation will be based on the following: • a detailed review, compilation, and interpretation of previously published geological work in the area; • interpretation of high-resolution light detection and ranging (LiDAR) data; • high-resolution orthophotos and airborne geophysical data; • geological data from delineation and geotechnical boreholes drilled between 2005 and 2007, and the recent 2014 and 2015 drilling programs at the Jay pipe area. An implicit modelling approach has been used to develop a three dimensional geological and structural model of the Jay pipe host rocks based on the preliminary interpretation. Ongoing studies aim to decode the geological and structural controls on the Jay kimberlite emplacement, along with its relationship with the nearby Misery kimberlite cluster.
 
 

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