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SDLRC - Region: Guyana - All


The Sheahan Diamond Literature Reference Compilation - Technical, Media and Corporate Articles based on Major Region - Guyana
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 announcements called 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 Region Index
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
Each article reference in the SDLRC is tagged with one or more key words assigned by Pat Sheahan to highlight the main topics of the article. In addition most references have been tagged with one or more region words. In an effort to make it easier for users to track down articles related to a specific region, KRO has extracted these region words and developed a list of major region words presented in the Major Region Index to which individual region words used in the article reference have been assigned. Each individual Region Report contains in chronological order all the references with a region word associated with the Major Region word. Depending on the total for each reference type - technical, media and corporate - the references will be either in their own technical, media or corporate Region Report, or combined in a single report. Where there is a significant number of technical references there will be a technical report dedicated to the technical articles while the media and corporate references are combined in a separate region report. References that were added in the most recent monthly update are highlighted in yellow within the Region Report. The Major Region words have been defined by a scale system of "general", "continent", "country", "state or province" and "regional". Major Region words at the smaller scales have been created only when there are enough references to make isolating them worthwhile. References not tagged with a Region are excluded, and articles with a region word not matched with a Major Region show up in the "Unknown" report.
Kimberlite - diamondiferous Lamproite - diamondiferous Lamprophyre - diamondiferous Other - diamondiferous
Kimberlite - non diamondiferous Lamproite - non diamondiferous Lamprophyre - non diamondiferous Other - non diamondiferous
Kimberlite - unknown Lamproite - unknown Lamprophyre - unknown Other - unknown
Future Mine Current Mine Former Mine Click on icon for details about each occurrence. Works best with Google Chrome.
CITATION: Faure, S, 2010, World Kimberlites CONSOREM Database (Version 3), Consortium de Recherche en Exploration Minérale CONSOREM, Université du Québec à Montréal, Numerical Database on consorem.ca. NOTE: This publicly available database results of a compilation of other public databases, scientific and governmental publications and maps, and various data from exploration companies reports or Web sites, If you notice errors, have additional kimberlite localizations that should be included in this database, or have any comments and suggestions, please contact the author specifying the ID of the kimberlite: [email protected]
Guyana - Technical, Media and Corporate
Posted/
Published
AuthorTitleSourceRegionKeywords
DS1860-0929
1896
Bauer, M.EdelsteinkundeLeipzig:, 1ST. EDITION 711P. INDIA PP. 140-155.Australia, Indonesia, Borneo, South America, Brazil, Guyana, India, Africa, South Africa, United States, RussiaDiamond Occurrence
DS1900-0239
1904
Bauer, M., Spencer, L.J.Precious Stonesá1904Griffin And Co., INDIA PP. 140-155; Brasil PP. 155-179; SOUTH AFRICA PP. 179-Australia, Borneo, Brazil, Guyana, India, South Africa, United States, RussiaDiamond Occurrence
DS1900-0022
1900
Escard, J.Les Pierres Precieuses et Autre Gisement DiamantifieresMoniteur De la Bijouterie., 2P.Asia, Borneo, Sumatra, Australia, South America, Guyana, North America, ChinaDiamond Occurrences
DS1900-0192
1903
Hargreaves, T.S.General Information on Gold, Diamonds and Forest Industries of British Guiana.Georgetown:, 25P.South America, GuyanaKimberley
DS1900-0336
1905
Kunz, G.F.Precious Stones: Diamonds - Kunz 1904Mineral Resources of The United States For 1904: Part 2, Non, PP. 941-987.United States, South Africa, Rhodesia, Brazil, Guyana, Suriname, Great LakesDiamond Occurrences
DS1900-0045
1901
Mineral Resources of the United StatesPrecious Stones: Diamond 1900The Mineral Industry During 1900, Vol. 9, PP. 300-305.Africa,South Africa, Russia, Australia, South America, Brazil, Guyana, United States, UralsGarnet, De Beers Mine, Current Activities
DS1900-0297
1905
Mineral Resources of the United StatesPrecious Stones: Diamond 1904The Mineral Industry During 1904, Vol. 13, PP. 156-158.South Africa, Guyana, Australia, Brazil, New South Wales, TransvaalDiamond Occurrence
DS1900-0705
1908
Sterrett, D.B.Precious Stones: Diamond (1908)Mineral Resources of The United States For 1907: Part 2, Non, PP. 803-804 .United States, South Africa, Brazil, Guyana, India, Australia, West CoastReview Of Current Activities
DS1900-0222
1903
Struthers, J., Fisher, H.Precious Stones: Diamond 1902The Mineral Industry During 1902, Vol. 11, PP. 244-248.Africa, South Africa, Australia, South America, Brazil, Guyana, Asia, BorneoCurrent Activities
DM1900-0827
1902
The Mineral IndustryPrecious Stones: Diamond 1901The Mineral Industry During 1901, Vol. 10, PP. 275-277.Africa, South Africa, Australia, South America, Brazil, Guyana, Asia, BorneoReview Of Current Activities
DM1900-0816
1902
The Mining JournalBritish Guiana DiamondsThe Mining Journal, Vol. 72, P. 262; P. 267; P. 835; P. 1309; P. 1734.South America, GuyanaCurrent Activities
DS1910-0358
1913
Kunz, G.F.Precious Stones - Kunz 1912The Mineral Industry During 1912., Vol. 21, PP. 707-736.South Africa, Southwest Africa, Namibia, Brazil, GuyanaBlank
DS1910-0589
1919
Miller, B.L., Singewald, J.T.Diamonds in Brasil and British GuianaNew York: Mcgraw Hill, 598P. 1ST. EDITION.Brazil, South America, Guyana, GuianaDiamonds
DS1910-0107
1910
Sterrett, D.B.Gems and Precious Stones: Diamond; 1909Mineral Resources of The United States For 1909: Part 2, Non, PP. 741-765.United States, South Africa, Southwest Africa, Guyana, AustraliaCurrent Activities, Diamonds Notable
DS1910-0216
1911
Sterrett, D.B.Gems and Precious Stones: Diamond; 1910Mineral Resources of The United States For 1910: Part 2, Non, PP. 858-864.United States, South Africa, Southwest Africa, Guyana, India, AustraliaReview Of Current Activities
DS1920-0225
1925
Conolly, H.J.C.Report of the Preliminary Survey of the Mazaruni and Puruni diamond Fields British Guiana.British Guiana Economic Geological Survey, PT. 1, MARCH-DECEMBER PP. 1-2; P. 43; PP. 90-91; PP. 100-103.South America, GuyanaHistory, Petrology, Diamond Prospecting
DS1920-0246
1925
Richardson, G.On the Diamond Trail in British GuyanaLondon: Methuen., 289P., ILLUS.GuyanaKimberlite, Kimberley, Janlib, Travelogue
DS1930-0017
1930
Bracewell, S.Report on the Buck Canister-oranapai Section of the Mazaruni Diamond Field. (with a Report by H.f. King.).British Guiana Geological Survey, PP. 1-18.Brazil, MazaruniKimberlite
DS1940-0059
1942
Roush, G.A.Precious and Semi Precious StonesThe Mineral Industry During 1941, Vol. 50, PP. 463-483.United States, South Africa, Angola, Zaire, Brazil, Guyana, Gold CoastReview Of Current Activities For The Year
DS1950-0212
1955
GreatorexDiamond Fever. #1London: Cassell And Co. Ltd., 223P.GuyanaKimberlite, Kimberley, History
DS1950-0327
1957
Greatorex, W.Diamond Fever. #2London: Cassell And Co, M., 223P.South America, Guyana, GuianaKimberlite
DS1950-0474
1959
Hartwell, J.W., Brett, B.A.Gem Stones; United States Geological Survey (usgs), 1958United States Geological Survey (USGS) MINERALS YEARBOOK, FOR 1958, PP. 467-478.Canada, British Columbia, South America, Brazil, GuyanaReview Of Current Activites
DS1950-0194
1954
Van kooten, I.C.Eerste Onderzoek Op DiamantMeddelingen Van De Geol. Mijnbouwkundige Dienst Van Suriname, No. 11, SEPT. 61P.Suriname, Brazil, Gold Coast, GuyanaBlank
DS1960-0056
1960
Hartwell, J.W., Brett, B.A.Gem Stones; United States Geological Survey (usgs), 1960United States Geological Survey (USGS) MINERALS YEARBOOK, FOR 1959, PP. 471-483.Brazil, Guyana, Venezuela, Russia, India, Israel, GuineaReview Of Current Activities
DS1960-1165
1969
Mcconnell, R.B.Fundamental Fault Zones in the Guiana and West African Shields in Relation to Presumed Axes of Atlantic Spreading.Geological Society of America (GSA) Bulletin., Vol. 80, PP. 1775-1782.South America, Guiana, West AfricaGeotectonics
DS1970-0262
1971
Choudhuri, A., Milner, M.Basic Magmatism in Guiana and Continental DriftNature., Vol. 232, No. 33, PP. 154-155.South America, GuianaBlank
DS1975-0968
1979
Bureau De Recherches Geologiques Et MinieresSection 12. DiamantBureau De Recherche Geologiques Et Minieres, Direction Cayenne., PP. 92-97.South America, GuianaDiamond Prospecting
DS1975-0972
1979
Cassedanne, J. AND J.Contrubicao ao estudo das jazidas diamantiferas da Guiana Venezuelana:jazidas do Guaniamo.Mineracao MetalurgiaM., No. 406, Jan. pp. 18-26.Venezuela, GuyanaDiamond Deposits
DS1975-0282
1976
Geological Surveys Of GuyanaAnnual Report for 1976Geological Survey Guyana, pp. 22-23.GuyanaDiamond Production
DS1975-0111
1975
Hurley, P.M., Fairbairn, H.W., Gaudette, H.E.Progress Report on Early Archean Rocks in Liberia, Sierra Leone and Guyana and Their General Stratigraphic Setting.In: The Early History of The Earth, Windley, B.f. Editor, Jo, PP. 511-524. 619P.Sierra Leone, Liberia, Guiana, West Africa, South AmericaGeology
DS1981-0263
1981
Lee, R.J.Diamond Production in GuyanaJournal of Gemology AND PROCEEDINGS of THE GEMMOLOGICAL ASSOCIAT, Vol. 17, No. 7, PP. 465-479.GuyanaKimberlite, Production, Diamond
DS1982-0257
1982
Hastings, D.A.An Investigation of Magsat and Complementary Dat a Emphasizing Precambrian Shields and Adjacent Areas of West Africa And south America. #3National Technical Information Service, No. NASA CR 170090; E83-10243, 6P.South Africa, Latin America, Guyana, Brazil, Argentina, South AmericaTectonics
DS1982-0258
1982
Hastings, D.A.An Investigation of Magsat and Complementary Dat a Emphasizing Precambrian Shields and Adjacent Areas of West Africa And south America. #2National Technical Information Service, NASA CR-169838, E83-10184, 6P.West Africa, Brazil, Argentina, Guyana, South America, GuineaMagsat, Tectonics, Structure
DS1983-0252
1983
Gibbs, A.K., Barron, C.N.The Guiana Shield ReviewedEpisodes, 1983, No. 2, PP. 7-14.South America, Guiana, Venezuela, Guyana, Suriname, French GuianaRegional Geology, Geotectonics, Stratigraphy, Roraima, Parguazan
DS1984-0482
1984
Marot, A., Capdevila, R., Leveque, B., Gruau, G., Martin, G., Cha.Le Synclinorium du Sud de Guyane Francaise: une Ceinture Deroches Vertes D'age Proterozoic Inferieur.Annual DES SCIENCES DE la TERRE, 10TH. SESSION HELD BORDEAU, South America, GuyanaBlank
DS1985-0219
1985
Gaudette, H.E., Olszewski, W.J.Geochronology of the basement rocks, Amazonas Territory, Venezuela and the tectonic evolution of western Guiana Shield.Geologie et Mijnbouw., Vol. 64, pp. 131-43.Venezuela, GuyanaGeochronology, Tectonics
DS1985-0231
1985
Gibbs, A.K.Contrasting Styles of Continental Mafic Intrusions in the Guiana Shield.International Symposium ON MAFIC DIKE SWARMS, HELD TORONTO, JUNE 4-7TH, 22P. 5 FIGS.South America, Guiana, Brazil, Venezuela, GuyanaLamprophyres, Carbonatite, Geotectonics
DS1985-0232
1985
Gibbs, A.K., Wirth, K.R.Origin and Evolution of the Amazonian CratonLunar Planetary Science Institute, Nasa Workshop On Early Cr, JUNE-JULY , 4P.South America, Guiana, French Guiana, BrazilGeotectonics, Granite, Greenstone Belts
DS1987-0265
1987
Guyana Geologic Mines CommissionGeologic map of GuyanaGuyana Geologic Mines Commission, Map 1: 1, 000, 000 $ 40.00GuyanaMap, Geology
DS1987-0266
1987
Guyana Geologic Mines CommissionMineral exploration map of GuyanaGuyana Geologic Mines Commission, Map 1: 1, 000, 000 $ 35.00GuyanaMap, Mineral exploration note date 1987
DM1989-1801
1989
Industrial MineralsGuyana's industrial minerals Gold to spur investment?Industrial Minerals, No. 260, May pp. 61-68GuyanaMentions diamonds
DM1989-1825
1989
International MiningInternational Mining Yearbook - by country. GuyanaInternational Mining, Vol. 6, No. 8, August p. 148. 1/2pGuyanaNews item, Brief overview -activity
DS1989-1308
1989
Roux, J.Diamond mining update. Bow River project, Stockdale and Yagal Mangi, Freeport-McMoran, Carr Boyd, Australian Diamond Exploration, MetanaMinerals, Ghana, Guinea, GuyanaIndiaqua, No. 53 1989/II, pp. 43, 45Australia, Ghana, Guinea, Guyana, Indonesia, Sierra LeoneNews item, Brief roundup mining acti
DM1989-1934
1989
Shaw, A.Guyana's mineral potentialMining Magazine, Vol. 160, No. 5, May pp. 358-360GuyanaBrief mention of alluvial diamonds
DM1989-1939
1989
Skillings Mining ReviewGold and diamonds in Guyana: investment opportunitiesSkillings Mining Review, Vol. 78, No. 41, October 14, pp. 4-8GuyanaExecutive summary, Prospectus on Guyana
DS1989-1488
1989
Techno-Economic Consulting IncGold and Diamonds in Guyana: investment opportunities.Two volume prospectus in conjunction with thegovernment.of Guyana and available at $ 275.00United StatesTechno-Economic Cons Inc. Park Ave. Attrium 237 21st Fl. N.Y. 10017 Attn:, Two volumesGuyanaProspectus, Diamonds
DS1990-0166
1990
Barnard, F.The winds of change ruffle Guyana's waters. Brief mention of diamond activities in an overview of activities in GuyanaInternational Liaison Group on Gold Mineralization Newsletter, No. 11, October 1990 pp. 45-46GuyanaNews item, Diamond activities
DM1990-1717
1990
Globe & MailGuyanese venture -control goes to FriedlandGlobe and Mail, August 28, Tuesday p. B9GuyanaNews item, Ivanhoe Capital
DM1990-1759
1990
International MiningGuyana... diamondsInternational Mining, Vol. 7, No. 8, August, p. 136GuyanaNews item, Brief overview -year acti
DS1990-0865
1990
Koivula, J.I., Kammerling, R.C.Guyana mining development. Ivan hoe Capital Corp. Kurupung-Enachu regionGems and Gemology, Gem news, Vol. 26, Winter pp. 300GuyanaNews item, Ivanhoe
DS1990-1036
1990
Metals Economics Group Strategic ReportDiamond opportunities, exploration agreements and capital expendituresMetals Economics Group Strategic Report, Vol. 3, No. 6, November/December pp. 3-11Australia, Botswana, Brazil, Indonesia, Russia, Canada, GuyanaChina, Namibia, Brief review of project, capital expenditures
DM1990-1861
1990
Mining Annual ReviewGuyanaMining Annual Review, p. 62GuyanaNews item, Annual review of diamond
DS1991-0618
1991
Grubb, M.D., McCallum, M.E.Genesis of diamond placers on the Guiana shield, South AmericaProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 151-153GuyanaIssineru-Enachu district, Roraima Group, geomorphology
DM1991-2120
1991
London Mining JournalGuyana declares more gold.. the Guyana gold and diamond association reacheda new agreement with the governmentLondon Mining Journal, Vol. 317, No. 8153, December 20/27th. p. 459GuyanaNews item, government
DM1991-2170
1991
Mining Annual ReviewGuyana: gemstonesMining Annual Review, June 1991, p. 61GuyanaBrief overview of 1990, Prospecting and production
DM1991-2202
1991
Northern MinerSouth American Gold fields sampling paleo gravel deposits in the MazaruniRiverNorthern Miner, Vol. 77, No. 19, July 15, p. 20GuyanaNews item, South American Goldfields, Golden Star Resources
DS1991-1581
1991
Sidder, G.B., Mendoza, V.Geology of the Venezuelan Guyanan shield and its relation to the entire Guyana shieldUnited States Geological Survey (USGS) Open File, No. 91-0141, 59p. 2 maps $ 13.00Venezuela, GuyanaGeology, Guyana shield
DS1992-0562
1992
Gibbs, A.K., Barron, C.N.Geology of the Guyana shieldOxford University of Press, 304p. 1 color map approx.$ 85.00 United StatesGuyanaGeology, Regional
DS1992-0563
1992
Gibbs, A.K., Barron, C.N.Geology of the Kapuskasing-Groundhog-Missinaibi River area, Folyet andKapuskasingOxford University Press, 304pGuyana ShieldGeology Guyana shield, Book -ad
DM1992-1958
1992
London Mining JournalGolden Star Resources merger with South American Gold fields LtdLondon Mining Journal, Vol. 318, No. 8165, p. 211GuyanaNews item, South American Goldfields
DM1992-2051
1992
Mining Magazine Annual ReviewGuyana: brief mention of diamondsMining Magazine Annual Review, p. 61GuyanaOverview -annual review, Diamond activities
DM1992-2085
1992
Northern MinerExall begins work in GuyanaNorthern Miner, Vol. 78, No. 2, March 16, p. 2GuyanaNews item Alluvials, Exall
DM1992-2086
1992
Northern MinerRoman buying Exall interestNorthern Miner, Vol. 78, No. 21, July 27, p. 16GuyanaNews item, Exall
DM1992-2087
1992
Northern MinerDiamonds being sought in GuyanaNorthern Miner, Vol. 78, No. 28, September 14, p. 12GuyanaNews item, Golden Star
DM1992-2088
1992
Northern MinerJuniors investigate Guyana's potentialNorthern Miner, Vol. 78, No. 4, March 30, p. B13GuyanaNews item, South American Goldfields, Golden Star
DS1993-0257
1993
Clapperton, C.Quaternary geology and geomorphology of South AmericaElsevier, 750pSouth America, Andes, Amazon Basin, Parana, Brazil, GuianaBook -table of contents, Geomorphology, Venezuela, Colombia, Ecuador
DS1993-0537
1993
Gibbs, A.K., Barron, C.N.Mention of diamonds in index - SurimamThe Geology of the Guiana Shield, Oxford University Press, approx. cost, 246p. pp. 187, 192-195Guyana, Brazil, Roraima, Venezuela, French GuianaGeology, Guiana Shield
DS1993-0570
1993
Gray, F., Orris, G.J.Placer diamondUnited States Geological Survey (USGS) Bulletin, No. B2062, pp. 86-88.Venezuela, GuyanaAlluvials, Diamonds
DC1993-2652
1993
KWG Resources IncKWG and St. Genevieve $ 3, 000, 000 placement in KWG for aquisition of diamond concessions in BrasilKwg Resources Inc, Press Release Dated June 1st. 1pBrazil, GuianaNews item, French Geological Survey (BRGM).
DS1993-1024
1993
Meyer, H.O.A., McCallum, M.E.Diamonds and their sources in the Venezuelan portion of the Guyana shieldEconomic Geology, Vol. 88, No. 5, August pp. 989-998.Venezuela, Guyana, BrazilAlluvial diamonds, Source region for diamonds
DM1993-2148
1993
Mining Annual ReviewDiamond overview in specific country, GuyanaMining Annual Review for 1993, p. 129.GuyanaOverview 1992 diamond production/exploration
DS1993-1082
1993
Morton, R.D., Shields, H.Diamond exploration and developments in the Republic of Guyana, SouthAmerica.Mid-continent diamonds Geological Association of Canada (GAC)-Mineralogical Association of Canada (MAC) Symposium ABSTRACT volume, held Edmonton May, pp. 117-120.GuyanaDiamond exploration Program
DS1993-1170
1993
Orris, G.J., Page, N.J., Bolm, K.S., Gray, F.Mines, prospects and occurrences of the Venezuelan Guayana ShieldUnited States Geological Survey (USGS) Bulletin, No. B2062, pp. 29-53.Venezuela, GuyanaDiamonds
DS1993-1632
1993
United States Geological Survey (USGS)Geology and mineral resource assessment of the Venezuelan Guayana shieldUnited States Geological Survey (USGS) Bulletin, No. B 2062, 121p. $ 20.00Venezuela, GuyanaTable of contents, Mineralization, metallogeny
DC1994-2968
1994
Golden Star Resources LtdGuyana geological permits received.... Upper Mazaruni and Upper Potaro ..George Cross Newsletter, No. 14, January 21, p. 2.GuyanaNews item - press release
DC1994-3015
1994
KWG Resources IncAnnual report for 1993, KWG Resources IncKwg Resources Inc., 17p.Ontario, Quebec, Brazil, Suriname, GuyanaNews item -Annual Report
DS1994-1013
1994
Ledru, P., Johan, Milesi, TegyeyMarkers of the last stages of the PaleoProterozoic collision: evidence fora 2 Ga continent involving circum South Atlantic provinces.Pres. Res., Vol. 69, pp. 169-91.Brazil, Gabon, Guiana, French Guiana, West AfricaTectonics
DM1994-2247
1994
London Mining JournalEmerging markets -special features: GuyanaLondon Mining Journal, p. 57.GuyanaCountry overview, Guyana, Country ranking -world wide
DM1994-2310
1994
London Mining JournalEmerging markets special supplement on specific countriesLondon Mining Journal, Vol. 323, No. 8291, Sept. 23, 92pPeru, Chile, Venezuela, Bolivia, Cuba, Mexico, Ghana, GuyanaArgentina, Indonesia, China, Surinam, Brasil, Ecuador, Kazakhstan, Tanzania, Zimbabwe, Phillipines, Botswana, Vietn
DM1994-2404
1994
Mining Annual ReviewGuyana.. diamond exploration brief overviewMining Annual Review 1994, p. 92.GuyanaDiamond exploration, Overview of 1993
DS1994-1281
1994
Nixon, P.H., Griffin, W.L., Davies, G.R., Condiffe, E.chromium garnet indicators in Venezuela kimberlites and their bearing on the evolution of the Guyana craton.Proceedings of Fifth International Kimberlite Conference, Vol. 1, pp. 378-387.Venezuela, GuyanaMineral chemistry, Garnets
DM1994-2476
1994
Northern MinerExall forms alliance with Guyanese diamond minerNorthern Miner, Vol. 80, No. 40, Dec. 3, p. 6.GuyanaNews item, Exall Resources
DM1994-2619
1994
Northern MinerVenezuela and the Guiana Shield. Special section. Company activities and country profilesNorthern Miner, Vol. 80, No. 30, September 26, p; . C1-C12Venezuela,Guyana, Suriname, ColombiaCountry overview, Exploration activities
DS1994-1919
1994
Williams, A.J.Mining investment opportunities in Latin America: a foreign investorsperspectiveMinerals Outlook Conference, The Canadian Institute of Mining, Metallurgy and Petroleum (CIM), 13pLatin America, Peru, Guyana, Ecuador, ArgentinaPanama, Mexico, Chile, Brasil, Bolivia, Columbia, Uruguay, Paraguay, Honderas
DS1995-0819
1995
Hoorn, C., Guerrero, J., Sarmiento, G.A., Lorente, M.A.Andean tectonics as a cause for changing drainage patterns in Miocene northern South America.Geology, Vol. 23, No. 3, March pp. 237-240.Guyana Shield, VenezuelaTectonics, Geomorphology
DM1995-2381
1995
London Mining JournalExall concludes Guyana financeLondon Mining Journal, Vol. 325, No. 8340, Aug. 18, p. 114.GuyanaNews item, Exall Resources Ltd.
DM1995-2576
1995
Northern MinerGlobal Industries is acquiring half interest in gold and diamond placers in Guyana held by Exall Resources.Northern Miner, Vol. 81, No. 21, July 24, p. 6.GuyanaNews item, Global Industries, Exall Resources
DS1995-1665
1995
Schaffer, C., Dalrymple, J.Lands cape evolution in Roraima, North Amazonia: planation, paleosols andpaleoclimatesZeitschrift f?r Geomorphologie, Vol. 39, No. 1, pp. 1-28Guyana, Venezuela, BrazilGeomorphology, Paleoclimates
DS1995-1747
1995
Sidder, G.B.Mineral deposits of the Venezuelan Guayana ShieldU.s. Geological Survey Bulletin., No. 2124-A, Chapter OVenezuela, GuyanaMineral deposits, Diamonds
DS1995-2086
1995
Wynn, J.C., Sidder, G.B., Gray, F., Page, N.J., Mendoza, V.Geology and mineral deposits of the Venezuelan Guayana shield... goldUnited States Geological Survey (USGS) Bulletin, No. 2124-A, approx. 150pVenezuela, GuyanaBook -table of contents, Geophysics, Lo Increible, Sierra Verdun, Cerro ArrendaJ.
DC1996-2698
1996
Currie Rose Resources IncWawa diamond exploration update; Guyana diamond property updateCurrie Rose Resources Inc., May 30, 1p.Ontario, GuyanaNews item - press release
DC1996-2699
1996
Currie Rose Resources IncProjects reviewed.... 18 targets have been trenched in Wawa... indicatorminerals. Guyana camp is established.George Cross Newsletter, No. 158, Aug. 15.Ontario, GuyanaNews item - press release
DM1996-2038
1996
London Mining JournalGuyana - country supplementLondon Mining Journal, Vol. 327, No. 8394, Sept. 6, 15p.GuyanaEconomics, business, exploration, Gold, bauxite
DM1996-2264
1996
Northern MinerGuyanese property optioned by Currie Rose ventures... Amalia Fallsproperty.Northern Miner, Exploring for Diamonds Feature, Vol. 81, No. 51, Feb. 19, p. B6.GuyanaNews item, Currie Rose Resources
DM1996-2265
1996
Northern MinerDiamonds produced at Mazaruni..Northern Miner, Vol. 82, No. 2, March 11, p. 6.GuyanaNews item, Mazaruni Minerals, Exall Resources
DM1996-2266
1996
Northern MinerMazaruni recovers gems from GuyanaNorthern Miner, Vol. 82, No. 9, Apr. 29, p. 6.GuyanaNews item, Mazaruni Minerals, Exall Resources
DM1997-1731
1997
Mining Annual ReviewCountries - updated on activities including relevant diamond exploration -brief yearly overview.Mining Annual Review, 1996Angola, South Africa, Botswana, Central African Republic, Guyana, Sierra LeoneBrief overview, Exploration, discoveries
DS1997-1185
1997
Valdespino, O.E.M., Alvarez, V.C.Paleomagnetic and rock magnetic evidence for inverse zoning in the Parquazabatholith, tectonics of shieldPrecambrian Research, Vol. 85, No. 1-2, Nov. 1, pp. 1-26Venezuela, GuyanaTectonics, Paleomagnetism
DS1997-1186
1997
Valdespino, O.E.M., Costanzo Alvarez, V.Paleomagnetic and rock magnetic evidence for inverse zoning in the Parguazabatholith and tectonics of...Precambrian Research, Vol. 85, 1-2, Nov. 1, pp. 1-26.Venezuela, GuyanaTectonics, Geophysics - magnetics
DC1997-2597
1997
Vanessa Ventures LtdGuyana diamonds recovered.. Potaro districtGeorge Cross Newsletter, No. 150, Aug. 6.GuyanaNews item - press release
DC1997-2598
1997
Vanessa Ventures LtdGuyana diamond reportGeorge Cross Newsletter, No. 246, Dec. 23.GuyanaNews item - press release
DM1998-2144
1998
Mining MagazineGuyana ... country overview. .. brief mention of diamondsMining Annual Review, p. 101.GuyanaNews item - diamonds, Overview
DS1998-1373
1998
Sobolev, N.V., Yefimova, E.S., Channer, D., AndersonA unique eclogitic source of Guaniamo diamonds, Guyana Shield, Venezuela7th International Kimberlite Conference Abstract, pp. 829-31.Venezuela, GuyanaEclogites, Diamond genesis
DC1998-2999
1998
Vanessa Ventures LtdGuyana diamonds recovered.... Potaro diamond property... gravel channel...total 180 carats.George Cross Newsletter, No. 140, July 22.GuyanaNews item - press release
DC1998-3000
1998
Vanessa Ventures LtdGuyana diamonds recovered.... Potaro proerty. 7000 Cubic metre pitGeorge Cross Newsletter, No. 194, Oct. 8.GuyanaNews item - press release
DC1998-3001
1998
Vanessa Ventures LtdGuyana diamond project report.... several km of access roads at the Potaro diamond project and airstrip.George Cross Newsletter, No. 89, May 8.GuyanaNews item - press release
DC1998-3002
1998
Vannessa Ventures Ltd.Guyana approves recon survey....New River Triangle... southern areaGeorge Cross Newsletter, No. 217, Nov. 12.GuyanaNews item - press release
DM1999-1086
1999
London Mining JournalGuyana -- brief mention of diamondLondon Mining Journal, Central and South America, p. 131.GuyanaNews item, Diamond activity
DC1999-1739
1999
Vanessa Ventures LtdGuyana paleochannel discovered. Maple Creek and Little Uewanf propertiesGeorge Cross Newsletter, No. 196, Oct. 13.GuyanaNews item - press release
DS2000-0198
2000
Dallagnol, R., Lafon, Fraga, Scandolara, BarrosThe Precambrian evolution of the Amazonian Craton: one of the last unknown Precambrian terranes in the world.Igc 30th. Brasil, Aug. abstract only 1p.Brazil, Guyana ShieldCraton - Amazon, Tectonics
DC2000-1877
2000
Golden Star Resources LtdAnnounces third quarter 2000 financial results... write down of DachineGolden Star Resources Ltd.., Nov. 20, 2p.GuyanaNews item - press release
DC2000-2114
2000
Vanessa Ventures LtdGuyana test pitting yields more diamonds and gold.... Maple Creek alluvial ( Potaro district).George Cross Newsletter, No. 112, June 12.GuyanaNews item - press release
DC2000-2115
2000
Vanessa Ventures LtdG. Chappel in charge of Potaro diamond projectGeorge Cross Newsletter, No. 198, Oct.17.GuyanaNews item - press release
DM2001-1599
2001
London Mining JournalGuyana: opportunites for the smaller investorLondon Mining Journal, Vol. 336, No. 8630, Apr. 20, p.287-8.GuyanaNews item, Diamond exploration
DS2002-0715
2002
Hickin, A.S., Paulen, R.C.Delineation of a placer diamond and gold resource in Guyana: an application of GIS to exploration.Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.49., p.49.Guyana, South AmericaGeophysics - GPR survey, Deposit - Potaro district
DS2002-0716
2002
Hickin, A.S., Paulen, R.C.Delineation of a placer diamond and gold resource in Guyana: an application of GIS to exploration.Gac/mac Annual Meeting, Saskatoon, Abstract Volume, P.49., p.49.Guyana, South AmericaGeophysics - GPR survey, Deposit - Potaro district
DS2002-1422
2002
Schmitz, M., Chalbaud, D., Castillo, J., Izarra, C.The crustal structure of the Guayana Shield, Venezuela, from seismic refraction and gravity data.Tectonophysics, Vol.345, 1-4, Feb.15, pp. 103-118.Venezuela, GuyanaGeophysics - seismics, gravity, Tectonics
DS2002-1611
2002
Trenkamp, R., Kellogg, J.N., Freymueller, J.T., Mora, H.P.Wide plate margin deformation, southern Central America and northwestern South America, CASA GPS observations.Journal of South American Earth Sciences, Vo. 15,2,June pp. 157-71.South America, GuyanaTectonics
DC2002-3241
2002
Vanessa Ventures LtdVanessa receives final environmental approval and commences full scale diamond and gold production. Potaro area.Vanessa ventures Ltd., July 29, 1p.GuyanaNews item - press release
DS2003-0539
2003
Hames, W., McHone, J.G., Renne, P., Ruppel, C.The central Atlantic magmatic province: insights from fragments of PangeaAmerican Geophysical Union, Geophysical Monograph, No. 136, 330p.Brazil, Morocco, Guinea, Guyana, MauritaniaMagmatism
DM2003-1952
2003
London Mining JournalEl Toco's diamond schedule. Cantara El Toco mining operation in Guayana areaLondon Mining Journal, Vol. 340, 8719 Jan 16, p. 43.Venezuela, Guyana, South AmericaNews item, Cantara El Toco
DS2003-1233
2003
Schneider Santos, J.O., Potter, P.E., Reis, N.J., Hartmann, L.A., Fletcher, I.R.Age, source and regional stratigraphy of the Roriama Supergroup and Roraima likeGeological Society of America Bulletin, Vol. 115, 3, pp. 331-48.Guyana Shield, Pacaraima PlateauGeochronology, Amazon Craton, zircon
DS2003-1243
2003
Scneider Santos, J. Orestes, Potter, P.E., Reiss, N.J., Hartmann, L.A., FletcherAge, source and regional stratigraphy of the Roraima Supergroup and Roraima likeGeological Society of America Bulletin, Vol. 115, 3, pp. 331-348.Guyana Shield, South America, BrazilAmazon Craton, baddeleyite, diamond, geochronology
DC2003-2795
2003
United Development InternationalUnited Development International enters exclusive negotiations on $ 1, 000,000 goldUnited Development International, Dec. 8, 1p.GuyanaNews item - press release
DC2003-2796
2003
United Development InternationalEnters exclusive negotiations on 30 further gold and precious stone claims andUnited Development International, Dec. 12, 1p.GuyanaPress release, Tiboku Mining
DC2003-2797
2003
United Development InternationalAnnounces Richard Corirossi as its diamond broker for Guyana operations. MazaruniUnited Development International, Oct. 8, 1p.Guyana, South AmericaNews item - press release
DS200412-0770
2003
Hames, W., McHone, J.G., Renne, P., Ruppel, C.The central Atlantic magmatic province: insights from fragments of Pangea.American Geophysical Union, Geophysical Monograph, No. 136, 330p.South America, Brazil, Guyana, Africa, Guinea, MauritaniaMagmatism
DS200412-1762
2003
Schneider Santos, J.O., Potter, P.E., Reis, N.J., Hartmann, L.A., Fletcher, I.R., McNaughton, N.J.Age, source and regional stratigraphy of the Roriama Supergroup and Roraima like outliers in northern South America based on U PGeological Society of America Bulletin, Vol. 115, 3, pp. 331-48.South America, GuyanaGeochronology, Amazon Craton, zircon
DC200412-4399
2003
United Development InternationalEnters exclusive negotiations on 30 further gold and precious stone claims and prospecting permits in Guyana. Kurupung River, PoUnited Development International, Dec. 12, 1p.South America, GuyanaNews item - press release, Tiboku Mining
DC200412-4400
2003
United Development InternationalAnnounces Richard Corirossi as its diamond broker for Guyana operations. Mazaruni River area.United Development International, Oct. 8, 1p.South America, GuyanaNews item - press release
DC200412-4401
2004
United Development InternationalSpecific mining equipment required for United Development International's Mazaruni project.United Development International, April 15, 1/4p.South America, GuyanaNews item - press release
DC200412-4402
2003
United Development InternationalUnited Development International enters exclusive negotiations on $ 1, 000,000 gold, diamonds and heavy mineral property in GuyaUnited Development International, Dec. 8, 1p.South America, GuyanaNews item - press release
DC200412-4403
2004
United Development InternationalCompletes review of radar imagery interpretation of Cuyuni River region.United Development International, July 16, 1p.South America, GuyanaNews item - press release
DC200412-4404
2004
United Development InternationalUnited Development International to access geological report detailing Mazaruni property.United Development International, April 20, 1p.South America, GuyanaNews item - press release
DS200512-0406
2004
Hartmann, L.A., Santos, J.O.Early Paleoproterozoic 2.5-2.0 Ga tectonic evolution of South America.Geological Society of America Annual Meeting ABSTRACTS, Nov. 7-10, Paper 142-5, Vol. 36, 5, p. 339.South America, Brazil, Venezuela, Guyana, French Guiana, UruguayTectonics
DS200512-0482
2005
Johnson, K.W.Diamond exploration in South America: emerging from the shadows.PDAC 2005, Abstract 1p.South America, Brazil, Venezuela, Guyana, French GuianaBrief overview abstract
DS200612-0302
2006
Da Rosa Costa, L., Lafon, J.M., Delor, C.Zircon geochronology and Sm Nd isotopic study: further constraints for the Archean and Paleoproterozoic geodynamical evolution of southe eastern Guiana Shield.Gondwana Research, Vol. 10, 3-4, pp. 277-300.South America, GuyanaGeochronology
DM200612-1936
2006
Diamonds.netFollowing illegal diamond trade across South America. Brief overview of Partnership Africa's Guyana report.Diamonds.net, May 2, 6p.South America, GuyanaNews item - conflict diamonds
DS200612-1038
2006
Partnership AfricaTriple jeopardy.. triplicate forms and triple borders: controlling diamond exports from Guyana.Partnership Africa, Occasional Paper # 14, April 27p.South America, GuyanaHistory, diamond production, environmental
DM200612-2625
2006
Rapaport NewsKimberley process at work in Guyana says Minister. Benn predicts 434,000 carats actually mined during 2005.Rapaport, March 31, 1/4p.Africa, GuyanaNews item - diamond production
DM200712-1831
2007
Diamonds.netGuyana: Explorer Trade & Commerce sues for return of rough.Diamonds.net, Nov. 23, 1/2p.South America, GuyanaNews item - Explorer Trade & Commerce
DS200812-0023
2008
Almeida, M.E., Macambira, M.J.B., Valente, S.de C.New geological and single zircon Pb evaporation dat a from the central Guyana Domain, southeastern Roraima, Brazil: tectonic implications for the central shield.Journal of South American Earth Sciences, Vol. 26, 3, Nov. pp. 318-328.South America, Brazil, GuyanaTectonics, Roraima
DM200812-2375
2008
DIB OnlineGuyana requests US forensic assistance to investgate 8 diamond miners' murders.Diamond Intelligence Briefs, Juen 30, 1p.South America, GuyanaNews item - legal
DM200812-2773
2008
MinewebEight miners murdered and burned in Guyana diamond camp.Mineweb.net, June 23, 1/2p.South America, GuyanaNews item - legal
DS200812-0852
2008
Partnership AfricaDiamonds and human security.. annual review 2008.Partnership Africa, October 24p.Africa, Central African Republic, Ivory Coast, Democratic Republic of Congo, Guinea, Ghana, Guyana, LiberiaKimberley Process and country reviews
DC200812-3359
2008
Shoreham Resources Ltd.Shoreham to produce from second Guyana project ( Midas Rex as operator of alluvials from Maple Creek- Potaro project.Shoreham Resources Ltd., June 2, 1p.South America, GuyanaNews item - press release
DC200912-2485
2009
Palisades Petroleum CorporationNegotiations for a large gold and diamond project in Guyana. Mazaruni area.Palisades Petrolum Corporation, August 2, 1p.South America, GuyanaNews item - press release
DM201112-3092
2011
Kaieteur NewsKidnappers release diamond dealer without ransom. Pure Diamonds Trading proprietor from Brazil.Kaieteur News, August 17, 1p.South America, GuyanaNews item - legal
DC201204-2493
2012
Nova Mining CorporationInitial due diligence test documents reflect significant diamond presence in new Guyana claim.Nova Mining Corporation, March 23, 1p.South America, GuyanaNews item - press release
DM201208-1766
2012
The Israeli Diamond IndustryGuyana halts new diamond mining over pollution.israelidiamond.co.il, July 9, 1/4p.South America, GuyanaNews item - legal
DM201208-1783
2012
The Israeli Diamond IndustryProtest pushes diamond miner to leave Guyana.israelidiamond.co.il, July 22, 1/4p.South America, GuyanaNews item - Bosai
DS201312-0042
2013
Ault, R.Guyana: the lost Hadean crust of South America?Goldschmidt 2013, AbstractSouth America, GuyanaGeochronology
DM201408-2184
2014
Rough-PolishedVenezuelan army said to have trespassed Guyanese border, attacked miners.rough-polished.com, July 8, 1/4p.South America, GuyanaNews item - legal
DS201604-0634
2016
Tan, J.S., Stachel, T., Morton, R.Diamonds from the Konawaruk River, Guyana.GAC MAC Meeting Special Session SS11: Cratons, kimberlites and diamonds., abstract 1/4p.South America, GuyanaKonawaruk area
DS201707-1360
2017
Reis, N.J., Nadeau, S., Fraga, L.M., Menezes Betiollo, L., Telma Lins Faraco, M., Reece, J., Lachhman, D., Ault, R.Stratigraphy of the Roraima Supergroup along the Brazil Guyana border in the Guiana shield, northern Amazonian craton - results of the Brazil Guyana geology and geodiversity mapping project.Brazil Journal of Geology, Vol. 47, 1, pp. 43-57.South America, Brazil, Guyanacraton

Abstract: The Geological and Geodiversity Mapping binational program along the Brazil?Guyana border zone allowed reviewing and in? tegrating the stratigraphy and nomenclature of the Roraima Supergroup along the Pakaraima Sedimentary Block present in northeastern Brazil and western Guyana. The area mapped corresponds to a buffer zone of approximately 25 km in width on both sides of the border, of a region extending along the Maú?Ireng River between Mount Roraima (the tri? ple?border region) and Mutum Village in Brazil and Monkey Mountain in Guyana. The south border of the Roraima basin is overlain exclusively by effusive and volcaniclastic rocks of the Surumu Group of Brazil and its correlated equivalent the Burro?Burro Group of Guyana.
DS201803-0447
2017
Fraga, L.M., Cordani, U., Reis, N., Nadeau, S., Camara Maurer, V.U Pb shrimp and La ICPMS new dat a for different A type granites of the Orocaima igneous belt, central Guyana shield, northern Amazonian craton. ( Project Geology of the Guiana Shield)Anais Do 15 Simposio Geologia da Amazonia, Belem , Dec. 5p. Abstract pdfSouth America, Guianacraton

Abstract: The Orocaima Igneous Belt (OIB) is a huge plutono-volcanic belt at the central part of Guiana Shield, consisting mainly of 1.99-1.96 Ga volcano-plutonic rocks with high-K calc-alkaline, A-type and shosho-nitic geochemical signatures. Three A-type granitic bodies from the central part of the OIB have been dated using U-Pb SHRIMP and LA-ICPMS methods. A 1985±11 Ma age was calculated for the Macucal Mountain Granite of the Saracura Suite (Brazil) and ages of 1977±3.9 Ma and 1975±5 were calculated for the alkaline riebeckite granites respectively of the Lontra (Brazil) and Makarapan (Guyana) bodies. These ages are in the same range of those reported for the Aricamã A-type granitoids and the results indicate that different A-type magmatism took place in the 1.993-1.975 Ma interval along the OIB, coeval to high-K calc-alkaline and shoshonitic magmatism. This scenario fits well to a post-collisional setting.
DS201804-0682
2017
Collett, B., Bassias, Y.Guiana shield tectonics influence hydrocarbon bearing compartments.Oil & Gas Journal, Oct. 2, pp. 42-45.South America, Guyanatectonics

Abstract: Interpretations of magnetic anomolies, fracture-zone geometry, and continental-oceanic crust transitions frame the debate surrounding the tectonic opening of the Equatorial and South Atlantic Ocean. Misinterpretations of movement in this region lead to misalignments and misunderstanding of the depositional environments at the margins. This article presents further evidence of the Guiana Shield's role during the initial separation between the American and African plates. Research suggests that the structure of the larger Guiana basin was controlled by the reactivation of Paleozoic and early Mesozoic faults, inherited from older orogenic belts. The same river paths fed the basin with clastic deposits for several tens to hundreds of millions of years. A network of NNW-SSE and NNE-SSW lineaments along the Atlantic margin coast and their onshore continuity at the edge of the Guiana Shield denote relics of deep faulting associated with the early rifting of the central Atlantic Ocean during early Jurassic, between 190 and 170 million years (Ma) (Fig. 1). These older faults were reactivated during Cretaceous E-W drift, a fact that created a favorable Tertiary-to-present structural and depositional environment for southward-shoreward hydrocarbon migration in the South American-Central Equatorial Atlantic margin (OGJ, Jan. 4, 2016, p. 42).
DS201806-1214
2018
Breeding, C.M., Eaton-Magana, S., Shigley, J.E.Natural color green diamonds: a beautiful conundrum.Gems& Gemology, Vol. 54, 1, spring pp. 2-27.South America, Brazil, Venezuela, Guyanadiamonds - green review

Abstract: Among fancy-color diamonds, natural-color green stones with saturated hues are some of the rarest and most sought after. These diamonds are colored either by simple structural defects produced by radiation exposure or by more complex defects involving nitrogen, hydrogen, or nickel impurities. Most of the world’s current production of fine natural green diamonds comes from South America or Africa. Laboratory irradiation treatments have been used commercially since the late 1940s to create green color in diamond and closely mimic the effects of natural radiation exposure, causing tremendous difficulty in gemological identification. Compounding that problem is a distinct paucity of published information on these diamonds due to their rarity. Four different coloring mechanisms—absorption by GR1 defects due to radiation damage, green luminescence from H3 defects, and absorptions caused by hydrogen- and nickel-related defects—can be identified in green diamonds. Careful microscopic observation, gemological testing, and spectroscopy performed at GIA over the last decade allows an unprecedented characterization of these beautiful natural stones. By leveraging GIA’s vast database of diamond information, we have compiled data representative of tens of thousands of samples to offer a look at natural green diamonds that has never before been possible.
DS201809-1994
2018
Bassoo, R., Befus, K.The magmatic origin and provenance of Guyana's diamonds: a first look.Goldschmidt Conference, 1p. AbstractSouth America, Guyanaalluvials

Abstract: Placer diamonds from the Proterozoic and Paleoproterozoic terranes of the Guiana Shield in Guyana, have an enigmatic geochemistry and provenance. Diamonds may be derived from kimberlite intrusions, but no outcrops have been identified in the dense tropical terrain. Alternatively, they may be weathered from 1.79 Ga, NE-SW trending mafic dykes of the Avanavero suite or eroded from 1.95 to 1.78 Ga sandstones and conglomerates of the Roraima Formation into recent alluvial river bed deposits [1]. To resolve these uncertainties, we acquired initial samples of 212 placer diamonds from different locations in Guyana for study. Diamonds range in size from 1.1 mm to 1.7 mm with a mean diameter of 1.3±0.2 mm. Diamonds are primarily dodecahedral to cubic, with lesser octahedral and minor macle forms. The diamonds are colourless to brown and most have a green surface skin. Diamond surfaces show diverse textures, including frosting, edge abrasions, network patterns, and ruts. Dissolution features are common and include point bottom trigons, with a diameter of 21±15 ?m. We measured N concentrations using FTIR (measured at 1282 cm-1). Diamonds are Type IaA-IaB with N concentrations of 55 ppm to 210 ppm. Total N ppm vs %NB ratios indicate mantlederived conditions of 1200 ºC and 4.7 GPa. Calculated Shields Parameter shear stresses of 0.0009 dynes/cm2 to 0.0016 dynes/cm2 suggest diamonds could be transported in bedloads derived from medium to very coarse sandstones or coarse- to pebble-sized kimberlitic lithics. Guyana’s diamonds are dissimilar to those from other regions of the Guiana Shield. To further this comparison, we studied 8 diamonds from Eastern Venezuela and Western Colombia on loan from the Smithsonian Museum of Natural History. Compared to Venezuelan and Colombian diamonds, Guyana’s diamonds are dodecahedral, and have a higher degree of dissolution textures, suggestive of higher ƒO2 conditions during kimberlite magma ascent. We will continue to study Guyana’s diamonds using a combination of electron microprobe, ?XRD, and Raman analyses of inclusions. Taken together we hope to infer the provenance of Guyana’s placer diamonds and the petrology of the mantle rocks from which they were derived.
DS201809-2055
2018
Leal, R.E., Lafon, J.M., da Ros Costa, L.T., Dantas, E.L.Orosirian magmatic episodes in the erepercuru-trombetas domain ( southeastern Guyana shield: implications for the crustal evolution of the Amazonian craton.South American Earth Sciences, Vol. 85, pp. 278-297.South America, Guyanacraton - Amazonian
DS201810-2371
2018
Reis, N.J., Nadeau, S., Fraga, L.M., Betiollo, L.M., Faraco, M.T.L., Reece, J., Lachhman, D., Ault, R.Stratigraphy of the Roraima Supergroup along the Brazil-Guyana border in the Guiana shield, northern Amazonian craton- results of the Brazil-Guyana geology and geodiversity mapping project.Brazilian Journal of Geology, Vol. 47, 1, pp. 43-57.South America, Brazil, Guyanacraton

Abstract: The Geological and Geodiversity Mapping binational program along the Brazil?Guyana border zone allowed reviewing and in? tegrating the stratigraphy and nomenclature of the Roraima Supergroup along the Pakaraima Sedimentary Block present in northeastern Brazil and western Guyana. The area mapped corresponds to a buffer zone of approximately 25 km in width on both sides of the border, of a region extending along the Maú?Ireng River between Mount Roraima (the tri? ple?border region) and Mutum Village in Brazil and Monkey Mountain in Guyana. The south border of the Roraima basin is overlain exclusively by effusive and volcaniclastic rocks of the Surumu Group of Brazil and its correlated equivalent the Burro?Burro Group of Guyana.
DS201901-0084
2019
Teixeira, W., Reis, N.J., Bettencourt, J.S., Klein, E.L., Oliveira, D.C.Intraplate Proterozoic magmatism in the Amazonian craton reviewed: geochronology, crustal tectonics and global barcode matches.Dyke Swarms of the World: a modern perspective Ed. Srivastava et al. Springer , Chapter pp. 111-154. availableSouth America, Guiana, Brazilcraton

Abstract: We review geochronological data including U-Pb baddelyite ages of Proterozoic mafic dyke swarms and sills of the Amazonian Craton, as well as their geochemical character and geological settings, in order to arrive at an integrated tectonic interpretation. The information together with the characteristics of coeval volcanic-plutonic suites indicates a cyclicity of the mafic-felsic activity through time and space. At least four LIP/SLIP events are apparent, and each one appears to accompany the stepwise accretionary crustal growth of Amazonia. The oldest two, the Orocaima (1.98-1.96 Ga) and Uatumã (c. 1.89-1.87 Ga) SLIPs, comprise calc-alkaline I-type and subordinate A-type plutonic and volcanic rocks. Synchronous mafic intraplate activity occurs across the Guiana and Central-Brazil Shields. These two events may be caused by interaction between subduction-related processes and mantle plumes with synchronous lithosphere extension during the two time periods. The Avanavero (1.79 Ga) LIP event mostly consists of mafic dykes and sills which are intrusive into the Roraima platform cover, in the Guiana Shield. They show tholeiitic chemistry and similarities with E-MORB and subcontinental lithospheric mantle-derived basalts, whereas the REE pattern suggests affinity with intraplate settings. The age of the Avanavero rocks is identical to the Crepori Diabase, located ca. 1800 km away to the south (Central-Brazil Shield). The youngest LIP event (1.11 Ga), the Rincón del Tigre-Huanchaca, has the Rio Perdido Suite as a component in the Rio Apa Terrane, which is ca. 300 km away from the Rincón del Tigre Complex, located in the SW portion of the Amazonian Craton. Furthermore, the Central-Brazil and Guiana Shields boasts widespread intraplate mafic activity, highlighted by the Mata-Matá (1.57 Ga), Salto do Céu (1.44 Ga) and Nova Floresta (1.22 Ga) mafic sills and the Cachoeira Seca Troctolite (1.19 Ga). Contemporaneous A-type, rapakivi granites with roughly similar ages also occur elsewhere. These particular episodes are extension specific steps of the Mesoproterozoic Amazonia, and the quite large distribution is consistent with LIP events. In a broader perspective, the intermittent Proterozoic intracratonic activity has a barcode that matches LIP/SLIP events in Columbia and Rodinia.
DS201904-0714
2019
Anzolini, C., Nestola, F., Mazzucchelli, M.L., Alvaro, M., Nimis, P., Gianese, A., Morganti, S., Marone, F., Campione, M., Hutchison, M.T., Harris, J.W.Depth of diamond formation obtained from single periclase inclusions. SDD ( Super Deep Diamonds)Geology , Vol. 47, 3, pp. 219-222.South America, Brazil, Guyanadiamond genesis

Abstract: Super-deep diamonds (SDDs) are those that form at depths between ?300 and ?1000 km in Earth’s mantle. They compose only 1% of the entire diamond population but play a pivotal role in geology, as they represent the deepest direct samples from the interior of our planet. Ferropericlase, (Mg,Fe)O, is the most abundant mineral found as inclusions in SDDs and, when associated with low-Ni enstatite, which is interpreted as retrogressed bridgmanite, is considered proof of a lower-mantle origin. As this mineral association in diamond is very rare, the depth of formation of most ferropericlase inclusions remains uncertain. Here we report geobarometric estimates based on both elasticity and elastoplasticity theories for two ferropericlase inclusions, not associated with enstatite, from a single Brazilian diamond. We obtained a minimum depth of entrapment of 15.7 (±2.5) GPa at 1830 (±45) K (?450 [±70] km depth), placing the origin of the diamond-inclusion pairs at least near the upper mantle-transition zone boundary and confirming their super-deep origin. Our analytical approach can be applied to any type of mineral inclusion in diamond and is expected to allow better insights into the depth distribution and origin of SDDs.
DM201904-0824
2019
Creamers Mining WeeklyGuyana and South Africa to sign declaration of incentives.creamersminingweekly, Mar. 1, 1/4p.South America, Guyana, Africa, South AfricaNews item - economics
DS201904-0772
2017
Reis, N.J., Nadeau, S., Fraga, L.M., Menezes Betiollo, L., Telma Lins, Faraco, M., Reece, J., Lachhman, D., Ault, R.Stratigraphy of the Roraima Supergroup along the Brazil-Guyana border in the Guiana shield, northern Amazonian craton - results of the Brazil Guyana geology and geodiversity mapping project.Brazilian Journal of Geology, Vol. 41, 1, pp. 43-57.South America, Brazil, GuyanaGuiana shield

Abstract: The Geological and Geodiversity Mapping binational program along the Brazil-Guyana border zone allowed reviewing and integrating the stratigraphy and nomenclature of the Roraima Supergroup along the Pakaraima Sedimentary Block present in northeastern Brazil and western Guyana. The area mapped corresponds to a buffer zone of approximately 25 km in width on both sides of the border, of a region extending along the Maú-Ireng River between Mount Roraima (the triple-border region) and Mutum Village in Brazil and Monkey Mountain in Guyana. The south border of the Roraima basin is overlain exclusively by effusive and volcaniclastic rocks of the Surumu Group of Brazil and its correlated equivalent the Burro-Burro Group of Guyana.
DS201911-2570
2019
Teixeira, W., Reis, N.J., Bettencourt, J.S., Oliveira, D.C.Intraplate Proterozoic magmatism in the Amazonian craton reviewed: geochronology, crustal tectonics and global barcode matches.Dyke swarms of the world: a modern perspective., 10.1007/978-981-13-1666-1_4 South America, Guiana, Brazilmagmatism

Abstract: We review geochronological data including U-Pb baddelyite ages of Proterozoic mafic dyke swarms and sills of the Amazonian Craton, as well as their geochemical character and geological settings, in order to arrive at an integrated tectonic interpretation. The information together with the characteristics of coeval volcanic-plutonic suites indicates a cyclicity of the mafic-felsic activity through time and space. At least four LIP/SLIP events are apparent, and each one appears to accompany the stepwise accretionary crustal growth of Amazonia. The oldest two, the Orocaima (1.98-1.96 Ga) and Uatumã (c. 1.89-1.87 Ga) SLIPs, comprise calc-alkaline I-type and subordinate A-type plutonic and volcanic rocks. Synchronous mafic intraplate activity occurs across the Guiana and Central-Brazil Shields. These two events may be caused by interaction between subduction-related processes and mantle plumes with synchronous lithosphere extension during the two time periods. The Avanavero (1.79 Ga) LIP event mostly consists of mafic dykes and sills which are intrusive into the Roraima platform cover, in the Guiana Shield. They show tholeiitic chemistry and similarities with E-MORB and subcontinental lithospheric mantle-derived basalts, whereas the REE pattern suggests affinity with intraplate settings. The age of the Avanavero rocks is identical to the Crepori Diabase, located ca. 1800 km away to the south (Central-Brazil Shield). The youngest LIP event (1.11 Ga), the Rincón del Tigre-Huanchaca, has the Rio Perdido Suite as a component in the Rio Apa Terrane, which is ca. 300 km away from the Rincón del Tigre Complex, located in the SW portion of the Amazonian Craton. Furthermore, the Central-Brazil and Guiana Shields boasts widespread intraplate mafic activity, highlighted by the Mata-Matá (1.57 Ga), Salto do Céu (1.44 Ga) and Nova Floresta (1.22 Ga) mafic sills and the Cachoeira Seca Troctolite (1.19 Ga). Contemporaneous A-type, rapakivi granites with roughly similar ages also occur elsewhere. These particular episodes are extension specific steps of the Mesoproterozoic Amazonia, and the quite large distribution is consistent with LIP events. In a broader perspective, the intermittent Proterozoic intracratonic activity has a barcode that matches LIP/SLIP events in Columbia and Rodinia.
DS202009-1610
2020
Bassoo, R., Befus, K.S., Liang, P., Forman, S.L., Sharman, G.Deciphering the enigmatic origin of Guyana's diamonds.The American Mineralogist, in press available 59p. PdfSouth America, Guyanadiamond crystallography

Abstract: Diamonds have long been mined from alluvial terrace deposits within the rainforest of Guyana, South America. No primary kimberlite deposits have been discovered in Guyana, nor has there been previous studies on the mineralogy and origin of the diamonds. Paleoproterozoic terranes in Guyana are prospective to diamond occurrences because the most productive deposits are associated spatially with the eastern escarpment of the Paleoproterozoic Roraima Supergroup. Geographic proximity suggests that the diamonds are detrital grains eroding from the <1.98 Ga conglomerates, metamorphosed to zeolite and greenschist facies. The provenance and paragenesis of the alluvial diamonds are described using a suite of placer diamonds from different locations across the Guiana Shield. Guyanese diamonds are typically small, and those in our collection range from 0.3 to 2.7 mm in diameter; octahedral and dodecahedral, with lesser cubic and minor macle forms. The diamonds are further subdivided into those with abraded and non-abraded surfaces. Abraded diamonds show various colors in cathodoluminescence whereas most non-abraded diamonds appear blue. In all populations, diamonds are predominantly colorless, with lesser brown to yellow and very rare white. Diamonds are predominantly Type IaAB and preserve moderate nitrogen aggregation and total nitrogen concentrations ranging from trace to ~1971 ppm. The kinetics of nitrogen aggregation indicate mantle-derived residence temperatures of 1124 ± 100 ºC, assuming residence times of 1.3 Ga and 2.6 Ga for abraded and non-abraded diamonds respectively. The diamonds are largely sourced from the peridotitic to eclogitic lithospheric upper mantle based on both ?13C values of -5.82 ± 2.45‰ (VPDB-LSVEC) and inclusion suites predominantly comprised of forsterite, enstatite, Cr-pyrope, chromite, rutile, clinopyroxene, coesite, and almandine garnet. Detrital, accessory minerals are non-kimberlitic. Detrital zircon geochronology indicates diamondiferous deposits are predominantly sourced from Paleoproterozoic rocks of 2079 ± 88 Ma.
 
 

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