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SDLRC - Region: Lesotho - Technical


The Sheahan Diamond Literature Reference Compilation - Technical Articles based on Major Region - Lesotho
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]
Lesotho - Technical
Posted/
Published
AuthorTitleSourceRegionKeywords
DS1860-0931
1896
Callot, M.Le Diamant (1896)Conference Held Jan. 15th. Fait Sous Les Auspices Des Amis D, 13P.Africa, LesothoDiamond Genesis
DS1940-0159
1947
Stockley, G.M.Report on the Geology of BasutolandBasutoland Govern. (maseru), PP. 7-114.LesothoGeology, Kimberlite, Diamond
DS1950-0249
1956
Anon.Diamonds in BasutolandColon. Geol. Min. Res., Vol. 6, No. 3, P. 346.LesothoDiamond Occurrences
DS1950-0250
1956
Anon.Diamond Found Near Mokhotlong in BasutolandThe Gemologist., SEPTEMBER, P. 166.Lesotho, South AfricaDiamond Occurrences
DS1950-0366
1958
Anon.Diamond Find in BasutolandThe Gemologist., SEPTEMBER, P. 174.Lesotho, South AfricaDiamond Occurrences
DS1960-0318
1963
Anon.Basutoland Diamonds LtdLesotho Department of Mines, Reports Issued 1959-1963, UNPUBL.LesothoGeology, Prospecting
DS1960-0425
1964
Bleackley, D., Workman, D.R.Reconnaissance Mineral Survey of BasutolandOverseas Geol. Institute Report, No. 3.LesothoDiamonds, Geology
DS1960-0030
1960
Dawson, J.B.A Comparative Study of the Geology and Petrography of the Kimberlites of the Basutoland Province. #1Leeds: Ph.d. Thesis, University Leeds, PP. 163-203. (ON FILE ONLY).LesothoKimberlite, Mineralogy, Petrology
DS1960-0136
1961
Dawson, J.B.Basutoland Kimberlites. #1Nature., Vol. 189, No. 4763, P. 475.LesothoGeology, Petrography
DS1960-0230
1962
Dawson, J.B.A Comparative Study of the Geology and Petrography of the Kimberlites of Basutoland Province. #2Leeds University Research Institute of African Geology Annual Report, Vol. 6, P. 17.LesothoGeology
DS1960-0231
1962
Dawson, J.B.Basutoland Kimberlites. #2Geological Society of America (GSA) Bulletin., Vol. 73, No. 5, PP. 545-559.LesothoGeology
DS1960-0940
1968
Dawson, J.B.Recent Researches in Kimberlite and Diamond GeologyEconomic Geology, Vol. 63, No. 8, PP. 504-511.Russia, India, Czechoslovakia, Lesotho, Canada, QuebecReview Of State Of The Art. Geochronology, Mineralogy, Inclusions
DS1960-1156
1969
Long, W.J.H.Kimberlite Exploration in the Mothae AreaLonrho Limited., UNPUBL.LesothoGeology, Prospecting
DS1960-1164
1969
Mathias, M., Rickwood, P.C.Ultramafic Xenoliths in the Matsoku Kimberlite Pipe, Lesotho in Upper Mantle Project.Geological Society of South Africa SPECIAL Publishing, No. 2, PP. 359-369.LesothoGeology
DS1960-0711
1966
Meaton, E.ST.P.Basutoland Diamonds: Evaluation of Selected Kimberlites Andalluvials.Overseas Geol. Institute Report, LesothoDiamond Mining Recovery, Kimberlite Pipes, Alluvial Diamond Placers
DS1960-0078
1960
Nixon, P.H.A Mineralogical Amd Geochemical Study of Kimberlites and The Associated Xenoliths.Ph. D. Thesis, University Leeds, LesothoKimberlite, Mineralogy, Petrology, Rock Chemistry
DS1960-0283
1962
Nixon, P.H.A Mineralogical and Geochemical Study of Kimberlites and The Associated Xenoliths.Leeds University Research Institute of African Geology Annual Report, Vol. 6, P. 17.LesothoMineralogy, Geochemistry
DS1960-1003
1968
Nixon, P.H., Hornung, G.A New Chromium Garnet End Member, Knorringite from KimberlitAmerican MINERALOGIST., Vol. 53, PP. 1833-1840.South Africa, LesothoMineralogy, Kao, Pyrope
DS1960-0382
1963
Nixon, P.H., Knorring, O. VON, Rooke, J.M.Kimberlites and Associated Inclusions of BasutolandAmerican MINERALOGIST., Vol. 48, PP. 1090-1132.LesothoMineralogy, Geochemistry, Inclusions
DS1970-0460
1972
Akella, J., Boyd, F.R.Partitioning of Titanium and Aluminum between Pyroxenes, Garnets and oxides.Carnegie Institute Yearbook, FOR 1971, PP. 378-384.Lesotho, South AfricaMatsoku, Skaergaard, Research
DS1970-0227
1971
Anon.Pipes 205 and 241, Butha Buthe: Description and Mode of Discovery.Lesotho Department of Mines And Geology, PROJECT No. LES 71/503- TECHNICAL REPORT No. 5.LesothoGeology, Prospecting
DS1970-0228
1971
Anon.A Comparative Evaluation of Exploration Methods Used in The search for Kimberlite in Lesotho.Lesotho Department of Mines And Geology, PROJECT LES 71/503, TECHNICAL REPORT No. 7.LesothoProspecting
DS1970-0622
1973
Anon.Diamond Exploration ProjectMaseru Department of Mines Geol. Spec. Report, UNPUB.LesothoGeology
DS1970-0865
1974
Anon.De Beers- Lesotho Government Agree on Diamond MineMining Engineering, Vol. 27, No. 4, P. 20.LesothoLetseng la Terae
DS1970-0866
1974
Anon.Exploration for Diamonds. Report on Project Results, Conclusions and Recommendations.Unesco, Co-published Lesotho Report No., LES71/503.LesothoProspecting
DS1970-0871
1974
Aoki, K.I.Field Excursion on Kimberlite in South Africa and LesothoJapan. Association Min. Petrol. Economic Geology Journal, Vol. 69, No. 3, PP. 121-127.South Africa, LesothoGuidebook, Geology
DS1970-0476
1972
Barthelemy, R.I., Dempster, A.N.Geological Interpretation of the Erts-l Satellite Imagery Of Lesotho, and Possible Relations between Lineaments and Kimberlite Pipe Emplacement.Proceedings of The 10th. International Symposium On Remote Sensing Of, Vol. 2, PP. 915-921.LesothoRegional Geology, Tectonics, Remote Sensing
DS1970-0632
1973
Bloomer, A.G., Nixon, P.H.The Geology of the Letseng la Terae Kimberlite PipesMaseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites, Editor, PP. 20-38.LesothoGeology
DS1970-0635
1973
Boullier, A.M., Nicolas, A.Texture and Fabric of Peridotite Nodules from Kimberlite Atmothae, Thaba Putsoa and Kimberley.Maseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 57-66.Lesotho,South AfricaPetrography, Xenoliths
DS1970-0032
1970
Boyd, F.R., Nixon, P.H.Kimberlite DiopsidesCarnegie Institute Yearbook, FOR 1968, PP. 324-329.LesothoMineralogy, Petrography
DS1970-0482
1972
Boyd, F.R., Nixon, P.H.Structure of the Upper Mantle Beneath LesothoCarnegie Institute Yearbook, FOR 1972, PP. 431-445.LesothoTectonics
DS1970-0483
1972
Boyd, F.R., Nixon, P.H.Ultramafic Nodules from the Thaba Putsoa Kimberlite PipeCarnegie Institute Yearbook, FOR 1971, PP. 362-373.LesothoXenoliths
DS1970-0637
1973
Boyd, F.R., Nixon, P.H.Origin of the Lherzolite Nodules in the Kimberlites of Northern Lesotho.1st International Kimberlite Conference, EXTENDED ABSTRACT VOLUME, PP. 47-50.LesothoGenesis, Xenoliths, Mineral Chemistry
DS1970-0638
1973
Boyd, F.R., Nixon, P.H.Origin of the Ilmenite Silicate Nodules in Kimberlites From lesotho and South Africa.In: Lesotho Kimberlites, P.h. Nixon, Ed., PP. 254-268.Lesotho, South AfricaPetrography, Petrology, Xenoliths
DS1970-0486
1972
Burley, A.J., Greenwood, P.G.Geophysical Surveys over Kimberlite Pipes in LesothoInstitute of Geological Sciences GEOPHYS. DIV., I.G.S. 540 1009/72, 32P.LesothoKimberlite, Geophysics
DS1970-0647
1973
Clement, C.R.Kimberlitic from the Kao Pipe, LesothoLesotho Kimberlites, P.h. Nixon Editor., PP. 110-121.LesothoGeology, Petrogaphy
DS1970-0648
1973
Clement, C.R.Kimberlites from the Kao Pipe, LesothoMaseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 110-121.LesothoXenoliths, Texture
DS1970-0653
1973
Cox, K.G., Gurney, J.J., Harte, B.Xenoliths from the Matsoku PipeMaseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 76-100.LesothoGeology, Petrography, Texture, Buckmann, Mineral Chemistry
DS1970-0274
1971
Dempster, A.N.Prospecting for Kimberlite Under "sponges"Lesotho Department of Mines And Geology, PROJECT LES 71/503- SPECIAL REPORT No. AD/6.LesothoDiamond, Morphology
DS1970-0275
1971
Dempster, A.N.Preliminary Note on the Application of Biogeochemical Methods in Kimberlite Exploration in Lesotho.Lesotho Department of Mines And Geology, SPECIAL REPORT No. AD/3.LesothoGeochemistry
DS1970-0276
1971
Dempster, A.N.Description of Diamonds Recovered by the ProjectLesotho Department of Mines And Geology, PROJECT LES 71/503, SPECIAL REPORT No. AD/8.LesothoSampling
DS1970-0277
1971
Dempster, A.N.List of Kimberlite Occurrences Within the Project AreaLesotho Department of Mines And Geology, PROJECT LES 503/71, SPECIAL REPORT No. AD/9.LesothoBlank
DS1970-0498
1972
Dempster, A.N.Preliminary Note on the Application of Bio-geochemical Methods in Kimberlite Exploration in Lesotho.Maseru Department of Mines Geol. Spec. Report, No. AD/3.LesothoGeochemistry
DS1970-0499
1972
Dempster, A.N.Evaluation of Kimberlite Dyke No. 143, Marallaneng, Butha Buthe Project Lesotho 3.Maseru Department of Mines Geol. Spec. Report, No. AD/1.LesothoGeology
DS1970-0664
1973
Dempster, A.N., Richard, B.Regional Geology and StructureMaseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 1-19.LesothoTectonics
DS1970-0665
1973
Dempster, A.N., Tucker, R.The Geology of the Sekameng Kimberlite Pipe and the Associated Dyke Swarm.Maseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 180-189.LesothoGeology
DS1970-0678
1973
Ferguson, J., Danchin, R.V., Nixon, P.H.Petrochemistry of Kimberlite AutolithsMaseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 285-293.LesothoGeochemistry, Petrology, Xenoliths, Ilmenite, Mothae, Microprobe
DS1970-0679
1973
Ferguson, J., Danchin, R.V., Nixon, P.H.Fenitization Associated With Kimberlite MagmasMaseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 207-213.Lesotho, South AfricaAlteration, De Beers, Letseng la Terae, Kao
DS1970-0919
1974
Gurney, J.J.The Origin of Kimberlite - Modern ConceptsGeological Society of South Africa Transactions, Vol. 77, No. 3, PP. 353-361.Lesotho, South AfricaGenesis
DS1970-0700
1973
Gurney, J.J., Ebrahim, S.Chemical Composition of Lesotho KimberlitesMaseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 280-284.Lesotho, South Africa, RussiaGeochemistry
DS1970-0701
1973
Gurney, J.J., Fesq, H.W., Kable, E.J.D.Clinopyroxene Ilmenite Intergrowths from Kimberlite a Re-appraisal.Maseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites, Editor, PP. 238-253.Lesotho, United States, Kentucky, Appalachia, KansasBlank
DS1970-0702
1973
Gurney, J.J., Harte, B., Cox, K.G.The Composition of the Mantle Xenoliths in the Matsoku Pipe1st International Kimberlite Conference, EXTENDED ABSTRACT VOLUME PP. 139-142.LesothoMineralogy
DS1970-0705
1973
Haggerty, S.E.Spinels of Unique Composition Associated with Ilmenite Reactions in the Liqhobong Kimberlite Pipe, Lesotho.Maseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 149-158.LesothoMineralogy, Mineral Chemistry
DS1970-0707
1973
Harris, J.W.Observations on Letseng la Terae DiamondsMaseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 37-38.LesothoMineralogy, Morphology, Colour
DS1970-0709
1973
Harte, B., Cox, K.G., Gurney, J.J.Petrography and Geological History of Upper Mantle Xenoliths from the Matsoku Kimberlite Pipe #11st International Kimberlite Conference, EXTENDED ABSTRACT VOLUME, PP. 155-158.LesothoPetrography
DS1970-0711
1973
Hausen, D.M.Description of Kimberlite Types at the Kao Pipe, North Central Lesotho.Newmont Exploration Ltd., UNPUB.LesothoGeology
DS1970-0526
1972
Hayman, E.C.Magnetometer Survey of Dyke 143, Marallaneng, Butha Buthe Project Lesotho 3.Maseru Department of Mines Geol. Spec. Report, No. ECH/1.LesothoKimberlite, Geophysics, Prospecting
DS1970-0535
1972
Hodges, P.A.Supplement to Feasibility Study of the Letseng la Terai Project.Rio Tinto Exploration (pty) Ltd., 50P.LesothoEconomics, Evaluation, Sampling
DS1970-0720
1973
Hornung, G., Nixon, P.H.Chemical Variations in the Knorringite Rich GarnetsMaseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 122-127.LesothoKao, Garnets, Analyses, Mineral Chemistry
DS1970-0721
1973
Hornung, G., Nixon, P.H.Chemical Variations in the Knorringite GarnetsIn: Lesotho Kimberlites, P.h. Nixon, Ed., PP. 121-127.South Africa, BasutolandMineral Chemistry
DS1970-0549
1972
Kresten, P.Heavy Mineral Survey and Kimberlite Occurrences in the Area west of Butha Buthe (leribe District).Maseru Department of Mines Geol. Spec. Report, No. PK/1.LesothoGeochemistry
DS1970-0737
1973
Kresten, P.The Coating of Kimberlitic Zircons- a Preliminary StudyMaseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 220- 223.LesothoButha Buthe, X-ray Patterns
DS1970-0738
1973
Kresten, P.The Geology of the Lemphane Pipes and Neighbouring IntrusionMaseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 159-167.LesothoMineral Chemistry
DS1970-0739
1973
Kresten, P.Differential Thermal Analysis of KimberlitesMaseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 269-279.LesothoMineral Chemistry, X-ray Patterns
DS1970-0947
1974
Kresten, P.Uranium in Kimberlites and Associated Rocks with Special Reference to Lesotho Occurrences.Lithos, Vol. 7, No. 3, PP. 171-180.LesothoGeology
DS1970-0741
1973
Kresten, P., Dempster, A.N.The Geology of the Pipe 200 and the Malibamatso Dyke SwarmMaseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 172-179.LesothoMineral Chemistry, Heavy Minerals
DS1970-0743
1973
Kushiro, I.Partial Melting of Garnet Lherzolites from Kimberlite at High Pressure.Maseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 294-299.South Africa, LesothoThaba Putsoa, Bultfontein, Mineral Chemistry
DS1970-0952
1974
Lawless, P.J.Some Aspects of the Geochemistry of Kimberlite XenocrystsCape Town: Msc. Thesis, University Cape Town., 121P.South Africa, LesothoKimberlite, Xenoliths
DS1970-0756
1973
Mason, R.The Limpopo Mobile Belt, Southern AfricaRoyal Society of London PHIL. Transactions, Vol. 1273, PP. 463-485.South Africa, Botswana, LesothoRegional Geology, Tectonics
DS1970-0770
1973
Mitchell, R.H., Brunfelt, A.D., Nixon, P.H.Trace Elements in Magnesian Ilmenites from Lesotho Kimberlites.In: Lesotho Kimberlites, P.h. Nixon, Ed., PP. 230-234.LesothoPetrology
DS1970-0771
1973
Mitchell, R.H., Brunfelt, A.O.Rare Earth Element Geochemistry of Kimberlites1st International Kimberlite Conference, EXTENDED ABSTRACT VOLUME, PP. 235-238.Lesotho, South AfricaTransvaal, Swartruggens, Wesselton, Mineral Chemistry
DS1970-0772
1973
Mitchell, R.H., Brunfelt, A.O., Nixon, P.H.Ilmenite Association Trace Element Studies. Pt. 2. Trace Element in Magnesian Ilmenites from Lesotho Kimberlites.Maseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 230-234.LesothoKao, Thaba Putsoa, Mineral Chemistry
DS1970-0967
1974
Motsoane, M.Index Map of Project Area. Remote Sensing and Other Survey Areas.Lesotho Department of Mines And Geology, PROJECT 73/021. MAP L: 500, 000.LesothoBlank
DS1970-0158
1970
Nixon, P.H.Geochemical Prospecting for Kimberlites: a Preliminary ReporMaseru Department of Mines Geol. Spec. Report, No. PHN/7LesothoGeochemistry
DS1970-0159
1970
Nixon, P.H.Notes on Specific Gravities of Lesotho KimberlitesMaseru Department of Mines Geol. Spec. Report, No. PHN/9LesothoGeology
DS1970-0160
1970
Nixon, P.H.The Sekameng Kimberlite PipeMaseru Department of Mines Geol. Spec. Report, No. PHN/6LesothoGeology, Prospecting
DS1970-0161
1970
Nixon, P.H.Scintillometer Traverses As a Means of Prospecting for Kimberlites.Maseru Department of Mines Geol. Spec. Report, No. PHN/8LesothoKimberlite, Geophysics
DS1970-0374
1971
Nixon, P.H.Recent Discoveries of Kimberlite Intrusions in the Mountain region of North Lesotho.Maseru Department of Mines Geol. Special Report, No. PHN/12.LesothoGeology
DS1970-0576
1972
Nixon, P.H.Report on the Examination of Kimberlites in the Kao AreaMaseru Department of Mines Geol. Spec. Report, No. PHN/14.LesothoGeology
DS1970-0577
1972
Nixon, P.H.Petrography of the Solane, Thaba Putsoa and Blow 13 Kimberlite Intrusions Northern Lesotho and the Significance of Subcalcic Diopside.Maseru Department of Mines Geol. Spec. Report, No. PHN/13.LesothoPetrography
DS1970-0781
1973
Nixon, P.H.How Wide, How Long, What Shape? the Vital Statistics of Lesotho Kimberlites.Maseru Department of Mines Geol. Spec. Report, No. PHN/16.LesothoClassification
DS1970-0782
1973
Nixon, P.H.The Geology of the Mothae, Solane, Thaba, Putsoa and Blow 13Maseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 39-47.LesothoGeology
DS1970-0783
1973
Nixon, P.H.PerspectivesMaseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 300-312.LesothoOverview Of Geology And Book
DS1970-0784
1973
Nixon, P.H. EDITOR.Lesotho KimberlitesLesotho National Development Corp., 350P.LesothoGeology, Kimberley, Janlib
DS1970-0785
1973
Nixon, P.H., Boyd, F.R.The Liqhobong Intrusions and Kimberlitic Olivine CompositionMaseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 141-148.LesothoGeology, Nodules, Mineral Chemistry
DS1970-0786
1973
Nixon, P.H., Boyd, F.R.Deep Seated NodulesMaseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 106-109.LesothoMineral Chemistry
DS1970-0787
1973
Nixon, P.H., Boyd, F.R.Petrogenesis of the Granular and Sheared Ultrabasic Nodule Suite in Kimberlite.Maseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 48-56.LesothoMineral Chemistry, Thaba Putsoa, Mothae
DS1970-0788
1973
Nixon, P.H., Boyd, F.R.The Petrogenesis of the Granular and Sheared Ultrabasic Nodule Suite in Kimberlites.In: Lesotho Kimberlites, P.h. Nixon Ed., PP. 48-56.LesothoPetrography
DS1970-0789
1973
Nixon, P.H., Boyd, F.R.Carbonated Ultrabasic Nodules from SekamengMaseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 190-196.LesothoXenoliths, Mineral Chemistry
DS1970-0790
1973
Nixon, P.H., Boyd, F.R.The Discrete Nodule Association in Kimberlites from Northern Lesotho.Maseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 67-75.Lesotho, South AfricaThaba Putsoa, Solane, Letseng la Terae, Lemphane, Sekameng, Pipe
DS1970-0793
1973
Nixon, P.H., Boyd, F.R., Boullier, A.The Evidence of Kimberlite and its Inclusions on the Constitution of the Outer Part of the Earth.Maseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 312-318.Lesotho, South AfricaGenesis
DS1970-0795
1973
Nixon, P.H., Kresten, P.Butha Buthe Dyke Swarms and Associated Kimberlite BlowsMaseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 197-206.LesothoGeology
DS1970-0796
1973
Nixon, P.H., Kresten, P.Chromium and Nickel in Kimberlite IlmenitesMaseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 235-237.Lesotho, South AfricaKao, Mothae, Monastery, Liquobong, Mineral Chemistry
DS1970-0589
1972
Richard, R.Final Report of the PhotogeologistMaseru Department of Mines Geol. Spec. Report, No. 2LesothoPhotogeology, Sensing
DS1970-0815
1973
Rolfe, D.G.The Geology of the Kao Kimberlite PipesMaseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 101-106.LesothoGeology
DS1970-0982
1974
Rooijen, P. VAN.Exploration for Kimberlite in the Butha Buthe AreaLesotho Department of Mines And Geology, SPECIAL REPORT No. PVR/1, PROJECT No. 71/503.LesothoProspecting
DS1970-0817
1973
Scott, L.Palynology of Deposits Overlying Lamphane Kimberlite Pipe, Lesotho.Maseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 168-171.LesothoPalynology
DS1970-0822
1973
Sheppard, S.M.F., Dawson, J.B.Hydrogen, Carbon and Oxygen Isotope Studies of Megacrysts And Mafic Minerals from Lesothan and South African Kimberlites #11st International Kimberlite Conference, EXTENDED ABSTRACT VOLUME, PP. 283-286.Lesotho, South AfricaIsotope
DS1970-0431
1971
Switzer, G.S.Questing for GemsNational Geographic., Vol. 140, No. 6, DECEMBER PP. 835-863.Southwest Africa, Namibia, South Africa, Lesotho, IndiaDiamond History, Ramaboa, Lesotho Brown, Diamonds Notable, Cdm
DS1970-0610
1972
Van eeden, O.R.The Geology of the Republic of South Africa- an Explanation of the 1: 1 Million Map.Geological Survey of South Africa, SPECIAL Publishing No. 18, 85P.South Africa, Lesotho, Botswana, Swaziland, Southern AfricaRegional Geology, Kimberley
DS1970-0848
1973
Whitelock, T.K.Morphology of the Kao DiamondsMaseru: Lesotho Nat. Dev. Corp. Lesotho Kimberlites Editor N, PP. 128-140.LesothoMorphology
DS1975-0010
1975
Anon.Letseng la Terae Surges AheadSouth African Institute of Mining and Metallurgy. Journal, Vol. 88, No. 4110, Nov. P, 63, P. 67, P. 71.LesothoDiamond Mining Recovery, Kimberlite Pipes
DS1975-0445
1977
Anon.Lengthy Wait for Weightier Diamonds in Lesotho MountainsIndiaqua., No. 18, PP. 11-18.LesothoLetseng la Terae
DS1975-0446
1977
Anon.Mountain DiamondsIndiaqua., No. 18, PP. 19-27.LesothoLetseng la Terae
DS1975-0668
1978
Anon.Letseng la Terae: Unique Mountain Diamond Mine OpensMining Engineering Journal of South Africa, Vol. 89, No. 4136, PP. 20, 21, 24, 25, 28, 32.LesothoDiamond Mining Recovery, Kimberlite Pipes
DS1975-0921
1979
Anon.Letseng Confounds Critics Despite an Inhospitable EnvironmenMining Engineering Journal of South Africa, Vol. 90, No. 4150, MAY PP. 55-65.LesothoDiamond Mining
DS1975-0015
1975
Aoki, K.I.Origin of Phlogopite and Potassic Richterite Bearing Peridotite Xenoliths from South Africa.Contributions to Mineralogy and Petrology, Vol. 53, No. 3, PP. 145-156.South Africa, LesothoBultfontein, Petrography
DS1975-0026
1975
Barthelemy, R., Dempster, A.N.Geological Interpretation in Erts 1 Satellite Imagery of Lesotho and Possible Relation between Lineament and Kimberlite pipe Emplacement.International Symposium ON REMOTE SENSING of THE ENVIRONMENT. CENTER F, Vol. 2, PP. 915-921.LesothoTectonics
DS1975-0239
1976
Barthelemy, R.T.Photogeology of Lesotho. Project Findings and Recommendations for a Report Prepared for Government of Lesotho by Unesco.Unesco, LES72/046/A/01/31.LesothoBlank
DS1975-0695
1978
Boctor, N.Z., Boyd, F.R.Oxide Minerals in Liqhobong KimberliteCarnegie Institute Yearbook, FOR 1977, PP. 870-876.LesothoMineral Chemistry
DS1975-0038
1975
Boyd, F.R.Chemical In homogeneities in Minerals in Kimberlite Nodules from Lesotho and the Kimberley Pipes.International Conference ON GEOTHERMOMETRY AND GEOBAROMETRY, HELD PENN., EXTENDED ABSTRACT VOLUME, 4P.Lesotho, South AfricaMineral Chemistry
DS1975-0039
1975
Boyd, F.R., Finger, L.W.Homogeneity of Minerals in Mantle Rocks from LesothoCarnegie Institute Yearbook, FOR 1974, PP. 519-528.LesothoPetrography
DS1975-0040
1975
Boyd, F.R., Nixon, P.H.Origins of Ultramafic Nodules from Some Kimberlites in Northern Lesotho and the Monastery Mine, South Africa.Physics and Chemistry of the Earth., Vol. 9, PP. 431-454.South Africa, LesothoPetrography, Genesis
DS1975-0971
1979
Carswell, D.A., Clarke, D.B., Mitchell, R.H.The Petrology and Geochemistry of Ultramafic Nodules from Pipe 200.Proceedings of Second International Kimberlite Conference, Proceedings Vol. 2, PP. 127-144.LesothoXenoliths
DS1975-0490
1977
Davis, G.L.The Ages and Uranium Contents of Zircons from Kimberlites And Associated Rocks.Carnegie Institute Yearbook, FOR 1976, PP. 631-635.South Africa, Botswana, Lesotho, Southwest Africa, Namibia, BrazilKimberley Mine, Geochronology
DS1975-1006
1979
Eggler, D.H., Wendlandt, R.F.Experimental Studies on the Relationship between Kimberlite magmas and Partial Melting of Peridotite.Proceedings of Second International Kimberlite Conference, Proceedings Vol. 1, PP. 330-338.LesothoPetrology
DS1975-0740
1978
Fairbairn, W.C.Diamond Digging in West Africa, Lesotho and South AmericaSmall Scale Mining of The World, Conference Held Juriaco Mex, PP. 678-707.West Africa, Lesotho, South America, Sierra Leone, Sewa, LiberiaDiamond Mining Recovery, Kimberlite Pipes
DS1975-1021
1979
Fiess, K.M.rare earth elements (REE) GEOCHEMISTRY of ULTRAMAFIC NODULES from KIMBERLITE PIPE200 in LESOTHO.Geol. Association Min. Association Can. Proceedings, Vol. 4, P. 49. (abstract.).LesothoMineral Chemistry
DS1975-0088
1975
Grant, B.G.Exploration of Diamonds Phase IiLesotho Department of Mines And Geology, PROJECT No. LES73/021 SPECIAL REPORT BG/1. AND MAP SHEET 292LesothoBlank
DS1975-0285
1976
Grant, B.G.Exploration for Diamonds Phase IiLesotho Department of Mines And Geology, PROJECT LES73/021, SPECIAL REPORT BG/2. FIELD GEOLOGISTS REPLesothoBlank
DS1975-1038
1979
Griffen, W.L., Carswell, D.A., Nixon, P.H.Lower Crustal Granulites and Eclogites from LesothoProceedings of Second International Kimberlite Conference, Proceedings Vol. 2, PP. 59-86.LesothoPetrology
DS1975-0093
1975
Gurney, J.J., Harte, B., Cox, K.G.The Composition of Mantle Xenoliths in the Matsoku PipePhysics and Chemistry of the Earth., Vol. 9, PP. 507-524.LesothoPetrography, Mineral Chemistry
DS1975-0097
1975
Harte, B., Cox, K.G., Gurney, J.J.Petrography and Geological History of Upper Mantle Xenoliths from the Matsoku Kimberlite Pipe #2Physics and Chemistry of the Earth., Vol. 9, PP. 477-506.LesothoPetrography, Geology
DS1975-0522
1977
Harte, B., et al.Clinopyroxene Rich Sheets in Garnet Peridotite Xenolith Specimens from the Matsuko Kimberlite Pipe.Proceedings of Second International Kimberlite Conference, EXTENDED ABSTRACT VOLUME.LesothoMineral Chemistry, Petrography
DS1975-0098
1975
Harte, B., Gurney, J.J.Ore Mineral and Phlogopite Mineralization Within Ultramafic nodules from the Matsoku Kimberlite Pipe.Carnegie Institute Yearbook, FOR 1974, PP. 528-536.LesothoPetrography
DS1975-0110
1975
Hunting Geology And Geophysics LtdExploration for Diamonds: Fracture Analysis StudyUnesco Development Programme For The Lesotho Government., MAP L: 250, 000.LesothoStructure, Tectonics
DS1975-0299
1976
Jessie, B.A Study of Kolo (lesotho) Kimberlites, Their Relation to Mantle Xenoliths and Orapa (botswana) Framesite Diamond Aggregates.Leeds University Research Institute of African Geology Annual Report, Vol. 20, 51P.Botswana, LesothoKimberlite Genesis, Peridotite, Chemical Analyses, Geochemistr
DS1975-1102
1979
Kobelski, B.J., Gold, D.P., Deines, P.Variations in Stable Isotope Compositions for Carbon and Oxygen in Some South African Kimberlites.Earth and Planetary Science Letters, Vol. 40, PP.South Africa, LesothoBenfontein, De Beers, Wesselton, Monastery, National, Premier
DS1975-0315
1976
Kresten, P., Berggren, G.The Thermal Decomposition of Thaumasite from Mothae Kimberlite Pipe, Lesotho.Journal of THERM. ANAL., Vol. 9, No. 1, PP. 23-28.LesothoGeothermometry
DS1975-0316
1976
Kresten, P., Fels, P.Kimberlite Zircons- a Possible Aid in Prospecting for Kimberlites.German Association of African Geol. Inform. Liaison Bulletin., Vol. 1, No. 1, PP. 47-56.Lesotho, South AfricaProspecting
DS1975-0117
1975
Kresten, P., Fels, P., Berggren , G.Kimberlitic Zircons- a Possible Aid in Prospecting for Kimberlites.Mineralium Deposita., Vol. 10, PP. 47-56.Lesotho, South Africa, Tanzania, East AfricaMorphology, Inclusions, Mineral Chemistry, Alteration
DS1975-0118
1975
Kresten, P., Fels, P., Berggren, G.Kimberlitic Zircons- a Possible Aid in Prospecting for KimbeMineralium Deposita., Vol. 10, No. 1, PP. 47-56.Lesotho, Tanzania, South Africa, East AfricaProspecting
DS1975-0787
1978
Kruger, F.J.A Contribution to the Petrology of KimberlitesMsc. Thesis, Rhodes University, 124P.South Africa, LesothoPetrography, Xenoliths, De Beers, Letseng la Terae
DS1975-1120
1979
Macgregor, I.D.Mafic and Ultramafic Xenoliths from the Kao Kimberlite PipeProceedings of Second International Kimberlite Conference, Proceedings Vol. 2, PP. 156-172.LesothoPetrography
DS1975-0800
1978
Macnae, J.C.Kimberlite GeophysicsEos, Vol. 59, No. 12, P. 1023, (abstract.).Lesotho, South AfricaKimberlite, Geophysics
DS1975-1122
1979
Macnae, J.C.Kimberlites and Exploration GeophysicsGeophysics, Vol. 44, No. 8, PP. 1395-1416.Lesotho, South AfricaKimberlite, Geophysics
DS1975-1131
1979
Mccallister, R.N., Meyer, H.O.A., Aragon, R.Partial Thermal History of Two Exsolved Clinopyroxenes From the Thaba Putsoa Kimberlite Pipe, Lesotho.Proceedings of Second International Kimberlite Conference, Proceedings Vol. 2, PP. 244-248.LesothoGeothermometry
DS1975-1152
1979
Meyer, H.O.A., Tsai, H.M.Inclusions in Diamond and the Mineral Chemistry of the Upper Mantle.In: Origin And Distribution of The Elements, Edited By Ahren, PP. 631-646.South Africa, LesothoGenesis, Diamond, Model
DS1975-0576
1977
Mitchell, R.H.Geochemistry of Magnesian Ilmenites from Kimberlites in South Africa and Lesotho.Lithos, Vol. 10, No. 1, PP. 29-37.South Africa, LesothoGeochemistry, Mineral Chemistry
DS1975-0151
1975
Nixon, P.H., Boyd, F.R.Studies on the Upper Mantle Lower Crust: IntroductionLeeds University Research Institute of African Geology Annual Report 19th., PP. 25-31.South Africa, LesothoKimberlite Genesis
DS1975-0152
1975
Nixon, P.H., Gray, A.Significance of Iron Oxide Carbonate Chert Argillite Metasediment Xenoliths from the Sub-karroo Basement of Lesotho.Leeds University Research Institute of African Geology Annual Report, Vol. 19, PP. 42-44.LesothoSekameng, Liqhobong, Kao, Matsuko, Mothae, Melkfontein, Petrograp
DS1975-0589
1977
Norman, J.W., Price, N.J., Peters, E.R.Photo geological Fracture Trace Study of Controls of Kimberlite Intrusion in Lesotho Basalts.Institute of Mining and Metallurgy. Transactions, Vol. 86, PP. B78-90.LesothoTectonics, Photogeology
DS1975-0596
1977
Paterson, N.R., Mcfadyen, D.A., Turkeli, A.Geophysical Exploration for Kimberlites with Special Reference to Lesotho.Geophysics, Vol. 42, No. 7, P. 1531, (abstract.).South Africa, LesothoKimberlite, Geophysics
DS1975-1179
1979
Paul, D.K.Isotopic Composition of Strontium in KimberlitesIndian Journal of Earth Sciences, Vol. 6, No. 1, PP. 107-111.South Africa, LesothoIsotope
DS1975-0597
1977
Paul, D.K., Crocket, J.H., Nixon, P.H.Abundances of Palladium, Irridium and Gold in Kimberlites And Associated Nodules. #2Proceedings of Second International Kimberlite Conference, EXTENDED ABSTRACT VOLUME, 3P.South Africa, LesothoMineralogy
DS1975-1181
1979
Paul, D.K., Crocket, J.H., Nixon, P.H.Abundances of Palladium, Irridium and Gold in Kimberlites And Associated Nodules. #1Proceedings of Second International Kimberlite Conference, Proceedings Vol. 1, PP. 272-279.South Africa, LesothoMineralogy
DS1975-0156
1975
Paul, D.K., Nixon, P.H., Buckley, F.Kimberlite ChemistryLeeds University Research Institute of African Geology Annual Report, PP. 32-35.LesothoGeochemistry, Kao
DS1975-0608
1977
Rogers, N.W.Granulite Xenoliths from Lesotho Kimberlites and the Lower Continental crust.Nature., Vol. 270, No. 5639, PP. 681-684.LesothoPetrography
DS1975-0173
1975
Rogers, N.W., Nixon, P.H.Geochemistry of Lower Crustal Granulite Xenoliths from Lesotho Kimberlites.Leeds University Research Institute of African Geology Annual Report, Vol. 19, PP. 38-41.LesothoMineral Chemistry
DS1975-0397
1976
Rooijen, P. VAN, Grohmann, H.Sketch Map, Showing the Results of the Magnetic Survey of Pipe 307, Resetilemla ( Maseru).Lesotho Department of Mines And Geology, PROJECT LES73/021, MAP 1: 500, 000.LesothoKimberlite, Geophysics, Prospecting
DS1975-0185
1975
Sheppard, S.M.F., Dawson, J.B.Hydrogen, Carbon and Oxygen Isotope Studies of Megacrysts And Matrix Minerals from Lesothan and South African Kimberlites. #2Physics and Chemistry of the Earth., Vol. 9, PP. 747-763.South Africa, LesothoIsotope
DS1975-1220
1979
Smirnov, G.I., et al.Isotopically Light Carbon in Diamonds from Some Kimberlite Pipes in Lesotho.Nature., Vol. 278, APRIL 12TH., P. 63.LesothoIsotope, Diamond, Inclusion
DS1980-0055
1980
Basu, A.R., Tatsumoto, M.Nd-isotopes in Selected Mantle-derived Rocks and Minerals And Their Implications for Mantle Evolution.Contr. Min. Petrol., Vol. 75, PP. 43-54.South Africa, Lesotho, United States, Gulf Coast, Arkansas, Hot Spring CountyKimberlite, Alnoite, Carbonatite, Pyroxene, Inclusions, Xenolith
DS1980-0066
1980
Boctor, N.Z., Boyd, F.R.Oxide Minerals in the Liqhobong Kimberlite , LesothoAmerican MINERALOGIST., Vol. 65, No. 7-8, PP. 631-638.LesothoMineralogy
DS1980-0075
1980
Bristow, J.W.The Geochronology and Geochemistry of Karoo Volcanics in The Lebombo and Adjacent Areas.Ph.d. Thesis, University Cape Town., South Africa, Botswana, Swaziland, LesothoBasaltic Rocks
DS1980-0085
1980
Carswell, D.A., Gibb, F.G.F.Geothermometry of the Garnet Lherzolite Nodules with Special Reference to Those Kimberlites of Northern Lesotho.Contributions to Mineralogy and Petrology, Vol. 74, No. 4, PP. 403-416.LesothoGeothermometry
DS1980-0088
1980
Carswell, D.A., Rice, C.M.The uranium content of garnet lherzolite xenoliths from kimberlites.Mineralogical Magazine., Vol. 43, No. 330, PP. 689-693.South Africa, LesothoPetrology
DS1980-0089
1980
Carswell, D.A., Rice, C.M.The Uranium Content of Garnet Lherzolite Xenoliths from KimberlitesMineralogical Magazine, Vol. 43, No. 330, June pp. 689-731.South Africa, LesothoXenoliths - Uranium., Deposit - Kimberley, Matsoku
DS1980-0141
1980
Gibb, F.G.F.Geothermometry of Garnet Lherzolite Nodules with Special Reference to Those from the Kimberlites of Northern Lesotho.Contributions to Mineralogy and Petrology, Vol. 74, PP. 403-416.LesothoGeothermometry
DS1980-0201
1980
Kruger, F.J.The Occurrence of Cebollite in Kimberlite and Included Zeolitized Crustal Xenoliths.Mineralogical Magazine., Vol. 43, No. 329, MARCH, PP. 583-586.LesothoMineral Chemistry
DS1980-0217
1980
Lock, N.P.The Geology of the Letseng KimberliteSheffield: Ph.d. Thesis, University Sheffield., LesothoKimberlite, Mineralogy, Petrology
DS1980-0218
1980
Lock, N.P., Dawson, J.B.Garnet-olivine Reaction in the Upper Mantle: Evidence from Peridotite Xenoliths in the Letseng la Terae Kimberlite.Royal Society. EDINBURGH EARTH SCI. SECT. Transactions, Vol. 71, PP. 47-53.LesothoPetrology
DS1980-0239
1980
Mitchell, R.H., Carswell, D.A., Clarke, D.B.Geological Implications and Validity of Calculated Equilibrium Conditions for Ultramafic Xenoliths from the Pipe 200 Kimberlite, Northern Lesotho.Contributions to Mineralogy and Petrology, Vol. 72, No. 2, PP. 205-218.LesothoKimberlite Genesis
DS1981-0071
1981
Balfour, I.The Lesotho BrownIndiaqua., 1981/1, No. 29, PP. 123-125.LesothoDiamonds Notable
DS1981-0104
1981
Burley, A.J., Kimbell, G.S., Patrick, D.J., Turnbulletin, G.A Gravity Survey of LesothoLondon: Institute of Geological Sciences International Report, 39P.LesothoRegional Tectonics, Geophysics
DS1981-0114
1981
Carswell, D.A., Griffin, W.L.Calculation of Equilibration Conditions for Garnet Granulite and Garnet WebsTschermaks Min. Petrol., Vol. 229-244.South Africa, LesothoChemical Analyses, Mineral Chemistry, Monastery, Liqhobong
DS1981-0117
1981
Chadwick, J.R.Big Stones Offset Low Grade at Lesotho's Diamond Mine. #2Indiaqua., 1981/2. No. 29, PP. 27-33.LesothoMining Recovery, Diamond, Letseng la Terae
DS1981-0229
1981
Kamara, A.Y.S.Review: Geophysical Methods for Kimberlite ProspectingAust. Society of Exploration Geophysics Bulletin., Vol. 12, No. 3, PP. 43-51.Sierra Leone, South Africa, Russia, Canada, United States, Lesotho, West AfricaKimberlite, Geophysics
DS1981-0270
1981
Loubert, M.Geochemical Analysis of Diverse Peridotite Nodules in Enclaves in Alkaline Basalts or Kimberlite Pipes; Evidence of Their Residual Nature.Bulletin. DE MINERALOGIE., Vol. 104, No. 5, PP. 642-654.South Africa, LesothoMineralogy, Geochemistry, Xenoliths, Bultfontein, Kimberley
DS1981-0289
1981
Mccallister, R.H., Gordon, L.N.Subcalcic Diopsides from Kimberlites: Chemistry, Exsolutionmicrostructures, and Thermal History.Contributions to Mineralogy and Petrology, Vol. 78, PP. 118-125.South Africa, Botswana, Tanzania, East Africa, LesothoMicroprobe Analyses, Genesis, Kimberlite
DS1981-0291
1981
Mccallister, R.H., Nord, G.L.JR.Subcalcic Diopsides Fromm Kimberlites: Chemistry, Exsolution Microstructures and Thermal History.Contributions to Mineralogy and Petrology, Vol. 78, PP. 118-125.Lesotho, South Africa, Botswana, Tanzania, East AfricaGenesis
DS1981-0303
1981
Mitchell, R.H., Keays, R.R.Abundance and Distribution of Gold, Palladium and Iridium InGeochimica et Cosmochimica Acta ., Vol. 45, PP. 2425-2442.Australia, United States, New Mexico, Colorado Plateau, LesothoBasanite, Mineral Chemistry, Kimberlite
DS1981-0307
1981
Morgan, J.W., et al.Composition of the Earth's Upper Mantle. Pt. I. Siderophile trace Elements in Ultramafic Nodules.Tectonophysics, Vol. 75, PP. 47-67.LesothoKimberlite Genesis
DS1981-0330
1981
Pasteris, J.D.Occurrence of Graphite in Serpentinized Olivines in Kimberlite.Geology, Vol. 9, No. 8, PP. 356-359.Lesotho, South AfricaKolo, Kao, Ramatseliso, Nqechane, Monastery, Dutoitspan, Frank Smith
DS1981-0341
1981
Pretorius, D.A.Comments on a Report on the Gravity Survey of LesothoJohannesburg: Economic Geol. Res. University University Witwatersrand., INTERNAL REPORT, 6P.LesothoRegional Tectonics, Geophysics
DS1982-0088
1982
Basu, A.R., Tatsumoto, M.Nd Isotopes in Kimberlites and Mantle EvolutionProceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, P. 214, (abstract.).South Africa, Lesotho, India, Russia, China, United StatesIsotope Chemistry
DS1982-0092
1982
Berg, G.W.The Geochemistry of Some Kimberlites from the Type Area in kimberley South Africa, in Relation to Models of Kimberlite Petrogenesis.Proceedings of Third International Kimberlite Conference, TERRA, Vol. 2, No. 3, P. 214, (abstract.).South Africa, LesothoKimberlite, Geochemistry, Genesis
DS1982-0112
1982
Boyd, F.R., Gurney, J.J.Low Calcium Garnets: Keys to Craton Structure and Diamond Chromiumystallization.Carnegie Institute Yearbook, FOR 1981, PP. 261-267.South Africa, Lesotho, Southwest Africa, NamibiaOrigin, Kimberlites
DS1982-0134
1982
Carswell, D.A., Griffin, W.L., Kresten, P.Peridotite Nodules from the Nogpetseu and Lipelaneng Kimberlites, Lesotho: a Crustal Origin or Mantle Origin.Proceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, P. 235, (abstract.).LesothoKimberlite, Genesis
DS1982-0199
1982
Exley, R.A., Smith, J.V.Trace Elements in Upper Mantle Garnets from Coarse Textured and Porphyroclastic Lherzolites.Geological Society of America (GSA), Vol. 14, No. 7, P. 486, (abstract.).South Africa, LesothoKimberlite
DS1982-0236
1982
Gurvich, M.Y., Kozlov, A.A., Malkov, Y.V., Pavlov, Y.G., Semonov.Structures of disintegration in rutile of kimberlite in Letseng la Teraipipe, Lesotho.(Russian)Geochemistry International (Geokhimiya), (Russian), No. 10, pp. 1520-1523LesothoBlank
DS1982-0265
1982
Hawkesworth, C.J., Rogers, N.W., Van calsteren, P.W., Menzies.Neodymium and Strontium Isotope Studies on Crustal Xenoliths from southernafrica.Proceedings of Third International Kimberlite Conference, TERRA, Vol. 2, No. 3, P. 236, (abstract.).South Africa, LesothoKimberlite, Geochronology
DS1982-0352
1982
Kruger, F.J.The Occurrence of Cebollite in Kimberlite and Included Zeolitized Crustal Xenoliths- a Correction and Discussion of The occurrence of Pectolite.Mineralogical Magazine., Vol. 46, No. 339, PP. 274-275.South Africa, LesothoKimberlite, Microprobe, Chemistry, De Beers, Letseng la Terae
DS1982-0405
1982
Martini, J.E.J., Hammerbeck, E.C.I., et al.Mineral Map of the Republics of South Africa, Transkei, Bophuthatswana, Venda and Ciskei and the Kingdoms of Lesotho And Swaziland.Department MINERAL AND ENERGY AFFAIRS, MAP 1:1, 1000, 000. 4 SHEETS.South Africa, Lesotho, Swaziland, Southern AfricaGeology, Mineral Resources, Diamonds
DS1982-0526
1982
Rogers, N.W., Hawkesworth, C.J.Proterozoic Age and Cumulate Origin for Granulite Xenoliths, Lesotho.Nature., Vol. 299, No. 5882, PP. 409-412.LesothoKimberlite, Geochronology, Genesis
DS1982-0527
1982
Rogers, N.W., Hawkesworth, C.J.Proterozoic Age and Cumulate Origin for Granulite Xenoliths, LesothoNature, Vol. 299, No. 5882, October 6th. pp. 409-413LesothoBlank
DS1982-0541
1982
Schandl, E.S., Clarke, D.B.Metasomatism in the Mantle Beneath Pipe 200, Northern LesothProceedings of Third International Kimberlite Conference, TERRA COGNITA, ABSTRACT VOLUME., Vol. 2, No. 3, PP. 265-266.LesothoKimberlite, Alteration
DS1983-0073
1983
Anon.Lesotho- Diamond... Closure of the Letseng la Terai MineMining Annual Review For 1982, P. 401.LesothoHistory
DS1983-0088
1983
Anon.Gemstones... DiamondsMining Annual Review., PP. 119-121; PP. 396-397.South Africa, Botswana, Namibia, Southwest Africa, Lesotho, ZaireReview Of Activities, Prospecting, Production, Cdm
DS1983-0152
1983
Bristow, J.W., Saggerson, E.P.A General Account of Karoo Vulcanicity in Southern AfricaGeologische Rundschau, Vol. 72, No. 3, PP. 1015-1060.South Africa, Botswana, Lesotho, Swaziland, Mozambique, ZimbabweRegional Geology
DS1983-0168
1983
Carswell, D.A., Griffin, W.L., Kresten, P.Peridotite Nodules from the Ngopetsoeu and Lipelaneng Kimberlites, Lesotho: a Crustal or Mantle Origin- Appendix.Annales Scientifiques De L' Universite De Clermont-ferrand Ii, No. 74, PP. 167-178.LesothoAnalyses, Petrography
DS1984-0144
1984
Basu, A.R., Rubury, E., Mehnert, H., Tatsumoto, M.Sm Nd, Potassium-argon and Petrologic Study of Some Kimberlites from Eastern United States and Their Implications for Mantle Evolution.Contributions to Mineralogy and Petrology, Vol. 86, No. 1, PP. 35-44.South Africa, United States, China, Appalachia, Russia, India, Lesotho, New YorkGeochronology, Petrology
DS1984-0161
1984
Boctor, N.Z., Nixon, P.H., Buckley, F., Boyd, F.R.Petrology of Carbonate Tuff from Melkfontein, East Griqualand, Southern Africa.Proceedings of Third International Kimberlite Conference, Vol. 1, PP. 75-82.South Africa, LesothoGenesis, Rare Earth Elements (ree), Mineral Chemistry
DS1984-0167
1984
Boyd, F.R.Siberian Geotherm Based on Lherzolite Xenoliths from the Udachnaya Kimberlite, UssrGeology, Vol. 12, No. 9, SEPTEMBER PP. 528-530.Russia, South Africa, India, United States, Montana, Rocky Mountains, LesothoGeothermobarometry, Garnet
DS1984-0181
1984
Carswell, D.A., Griffin, W.L., Kresten, P.Peridotite Nocules from the Ngopetsoeu and Lipelangene Kimberlites, Lesotho a Crustal or Mantle Origin.Thrid Kimberlite Conference, Vol. 2, PP. 229-243.Lesotho, Butha Buthe, RomaPetrography, Mineral Chemistry, Whole Rock
DS1984-0219
1984
Dawson, J.B.Xenoliths in Kimberlites- Clues to the Earths Upper MantleSci. Progress, Vol. 69, No. 273, PP. 65-81.LesothoGenesis, Origin, Thab Putsoa, Eclogite, Metasomatism
DS1984-0278
1984
Finnerty, A.A., Boyd, F.R.Evaluation of Thermobarometers for Garnet PeridotitesGeochimica Et Cosmochimica Acta., Vol. 48, No. 1, PP. 15-28.LesothoMineral Chemistry, Genesis, Thermobarometry
DS1984-0307
1984
Gold, D.P.A Diamond Exploration Philosophy for the 1980's. the RecogniEarth And Mineral Sciences, Vol. 53, No. 4, SUMMER PP. 37-42.United States, Russia, Canada, Tanzania, Lesotho, South Africa, AustraliaBrief Overview Of Exploration, Classification, Genesis, Origin
DS1984-0352
1984
Helstaedt, H., Gurney, J.J.Kimberlites of Southern Africa- are they Related to Subduction Processes? #2Proceedings of Third International Kimberlite Conference., Vol. 1, PP. 425-434.South Africa, Botswana, LesothoDistribution, Kimberlite, Genesis, Xenolith
DS1984-0403
1984
Kharkiv, A.D.The Compositon of Upper Mantle Xenoliths in Kimberlites From the Proterozoic to the Cretaceous.International Geology Review, Vol. 26, No. 8, AUGUST, PP. 919-931.Russia, Lesotho, South AfricaGeochronology, Petrography
DS1984-0606
1984
Richardson, S.H.Evolution of enriched mantle from derivative basalt, peridotite and diamond inclusion geochemistryPh.D. Thesis, Mass Institute Technology, 191pSouth Africa, LesothoGeochronology, Isotope, Thaba Putsoa, Bultfontein, Kimberle, Diamond Inclusion
DS1985-0180
1985
Falls, R.E.R.Diamonds: Gradual Industry RecoveryEngineering and Mining Journal, Vol. 186, No. 3, MARCH PP. 129-130.South Africa, Southwest Africa, Namibia, Lesotho, BotswanaProduction
DS1985-0271
1985
Hartnady, C.J.H.Uplift, Faulting, Seismicity, Thermal Spring and Possible Incipient Volcanic Activity in the Lesotho-natal Region, Southeast Africa: the Quathlamba hotspot Hyopthesis.Tectonics, Vol. 4, No. 4, JUNE, PP. 371-377.LesothoGeotectonics
DS1985-0497
1985
Nixon, P.H., Boyd, F.R., Hawkesworth, C.Archaean Harzburgites with Garnet of Diamond Facies from Southern African Kimberlites.Geological Society of America (GSA), Vol. 17, No. 3, P. 186. (ASBTR.).South Africa, LesothoMineral Chemistry, Xenoliths
DS1985-0622
1985
Slavinskiy, V.V.Garnet Two Pyroxene Paleogeotherms #2Doklady Academy of Science USSR, Earth Science Section, Vol. 275, July pp. 50-52.LesothoGeothermometry
DS1985-0624
1985
Smith, D.A Comparative Study of Garnet Peridotite Nodules from Potassic Volcanic Rocks and Kimberlite.Geological Society of America (GSA), Vol. 17, No. 3, P. 192. (abstract.)United States, Colorado Plateau, LesothoThumb, Minette, Mineral Chemistry, Metasomatism
DS1985-0658
1985
Takahashi, E., Scarfe, C.M.Melting of Peridotite to 14 Gpa and the Genesis of KomatiiteNature., Vol. 315, No. 6020, JUNE 13TH. PP. 566-568.Lesotho, United States, Colorado Plateau, New MexicoLherzolite, Kilbourne Hole, Thaba Putsoa, Chemical Analysis
DS1986-0346
1986
Harte, B.Speculations concerning the importance of metasomatic melt migration In the formation of pyroxenite sheets in garnet peridotite xenoliths from MatsokuLesProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 184-186LesothoXenoliths
DS1986-0349
1986
Hawkesworth, C.J., Van Calsteren, P., Palacz, Z., Rogers, N.W.Crustal xenoliths from southern Africa: chemical and age variations within the continental crustProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 253-255South Africa, LesothoBlank
DS1986-0579
1986
Moore, A.E.Kimberlite olivinesProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 78-80Lesotho, South Africa, southwest Africa, Namibia, KansasLetseng la terai, De Beers, Newlands, Gibeon, Hamilton Bran
DS1986-0796
1986
Takahashi, E., Ito, E., Scarfe, C.M.Melting and subsolidus phase relation of mantle peridotite up to 25 GPaProceedings of the Fourth International Kimberlite Conference, Held Perth, Australia, No. 16, pp. 208-210New Mexico, LesothoKilborne Hole, Thaba Putsoa
DS1987-0062
1987
Bodinier, J.L., DupuyDistribution of trace transition elements in olivine and pyroxenes from ultramafic xenoliths: application of microprobe analysisAmerican Mineralogist, Vol. 72, pp. 902-913LesothoAnalyses
DS1987-0090
1987
Carswell, D.A., Gibb, F.G.F.Garnet lherzolite xenoliths in the kimberlites of northernLesotho:revised P-T equilibraium conditions and upper mantlePaleogeotherM.Contributions to Mineralogy and Petrology, Vol. 97, No. 4, pp. 473-487LesothoKimberlite, Geothermometry
DS1987-0278
1987
Harte, B., Winterburn, P.A., Gurney, J.J.Metasomatic and enrichment phenomena in garnet peridotite facies mantle xenoliths from the Matsoku kimberlite pipe, LesothoIn: Mantle Metasomatism, edited M.A. Menzies, C.J. Hawkesworth, Academic, pp. 145-220LesothoBlank
DS1988-0393
1988
Kvasnitsa, V.N., Taran, M.N., Smirnov, G.I., Legkova, G.V.Violet red zircon from kimberlite.(Russian)Mineral. Zhurnal, (Russian), Vol. 42, No. 2, pp. 12-17LesothoDiamond morphology, Zircon
DS1988-0632
1988
Shervais, J.W., Taylor, L.A., Lugmair, G.W., Calyton, R.N., MayedaEarly Proterozoic oceanic crust and the evolution ofsubcontinentalmantle: eclogites and related rocks From southern AfricaGeological Society of America (GSA) Bulletin, Vol. 100, No. 3, March pp. 411-423LesothoBlank
DS1988-0646
1988
Smith, D.Implications of zoned garnets for the evolution of shearedlherzolites:examples from northern Lesotho and the ColoradoPlateauJournal of Geophysical Research, Vol. 93, No. B5, May 10, pp. 4895-4906Lesotho, Colorado PlateauBlank
DS1989-0428
1989
Finnerty, A.A.Inflected mantle geotherms from xenoliths are real:evidence from olivinebarometryGeological Society of Australia Inc. Blackwell Scientific Publishing, Special, No. 14, Vol. 2, pp. 883-900LesothoGeobarometry, Mantle
DS1989-0429
1989
Finnerty, A.A.Xenolith derived mantle geotherms -whither the inflectionContributions to Mineralogy and Petrology, Vol. 102, No. 3, pp. 367-375LesothoMantle, Geothermometry
DS1990-0336
1990
Clarke, D.B., MacKay, R.M.An ilmenite garnet clinopyroxenite nodule from Matsoku: evidence for oxide rich liquid immiscibility in kimberlitesCanadian Mineralogist, Vol. 28, pt. 2, June pp. 229-239LesothoGeothermometry, Garnet analyses Xenolith
DS1990-1165
1990
Pearson, D.G., Boyd, F.R., Nixon, P.H.Graphite-bearing mantle xenoliths from the Kaapvaal Craton: Implications for graphite and diamond genesisCarnegie Institution Geophysical Laboratory Annual Report of the Director, No. 2200, pp. 11-19Southern Africa, LesothoGraphite, Diamond genesis
DS1991-0637
1991
Gurney, J.J., Moore, R.O., Otter, M.L., Kirkley, M.B., Hops, J.J.Southern African kimberlites and their xenolithsMagmatism in Extensional structural settings, Springer pp. 495-536.South Africa, Botswana, Zimbabwe, Lesotho, SwazilandKimberlites, Review
DS1991-0681
1991
Hartnady, C.J.H.Seismicity and plate boundary evolution in southeastern AfricaSouth African Journal of Geology, Vol. 93, No. 3, July pp. 473-484South Africa, LesothoTectonics, East African rift
DS1991-1310
1991
Pearson, D.G., Boyd, F.R., Field, S.W., Pasteris, J.D., HaggertyGraphite bearing peridotites from the Kaapvaal craton: their carbon isotopic compositions and implications for peridotite thermobarometryProceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 323-325South Africa, LesothoKimberley, Jagersfontein, spectrometry, Carbon composition -table
DS1991-1606
1991
Smirnov, G.I., Kharkiv, A.D., Zinchuk, N.N.On the problem of vertical zoning of kimberlite bodies (on the example ofLesotho)Proceedings of Fifth International Kimberlite Conference held Araxa June 1991, Servico Geologico do Brasil (CPRM) Special, pp. 551-552LesothoMineralogy, Criteria
DS1992-1013
1992
Matthews, M., Harte, B., Prior, D.Mantle garnets - a cracking yarnGeochimica et Cosmochimica Acta, Vol. 56, No. 7, July pp. 2633-2642Lesotho, Southern AfricaMantle geochemistry, Garnets
DS1992-1514
1992
Takeshi MoriThe mechanically incorporated garnet in a harzburgite xenolith from Lesotho kimberlite pipeProceedings of the 29th International Geological Congress. Held Japan August 1992, Vol. 1, abstract p. 177LesothoLiqhobong pipe, Garnet
DS1994-0966
1994
Kushiro, I.Recent experimental studies on partial melting of mantle peridotites at high pressures using diamond aggregates.Journal of Geological Society of Japan, Vol. 100, No. 1, January pp. 103-110.Lesotho, CaliforniaExperimental petrology, Mantle peridotites
DS1994-1709
1994
Street, G.J., Bulletinock, S.J., Kones, R.K.Airborne geophysics in diamond and gemstone explorationPreprint from Snowden Mining Forum held May 18, Perth, 8p. 6 figuresLesotho, Russia, Siberia, Northwest Territories, BotswanaGeophysics -aeromagnetics, Case histories -Australia
DS1994-1730
1994
Sweeney, R.J., Duncan, A.R., Erlank, A.J.Geochemistry and petrogenesis of central Lebombo basalts of the KarooIgneous ProvinceJournal of Petrology, Vol. 35, pt. 1, pp. 95-125.South Africa, Zimbabwe, Swaziland, LesothoGeochemistry, Magma - basalts
DS1997-0445
1997
Griffin, W.L., Moore, R.O., Ryan, Gurney, WinGeochemistry of magnesian ilmenite megacrysts from Southern african kimberlites #2Russian Geology and Geophysics, Vol. 38, No. 2, pp. 421-443.South Africa, Botswana, Namibia, LesothoGeochemistry, Megacrysts
DS1997-0789
1997
Mining Environmental ManagementDams and miners.... Ash River six hundred diamond miners exploiting a richpipe at Kao, Lesotho.Mining Environmental management, June p. 29.LesothoDiamond - individual miners, Mining - dam probleM.
DS1997-1009
1997
Schulze, D.J.The significance oof eclogite and chromium poor megacryst garnets in diamondexploration.Exploration and Mining Geology, Vol. 6, No. 4, pp. 349-366.Russia, Yakutia, Siberia, South Africa, Lesotho, WyomingMineralogy, garnet compositions, Deposit - Udachnaya, Premier, Monastery, Lace, Kaalvall
DS1998-0154
1998
Boyd, F.R., Pearson, D.R., Mertzman, S.A.Spinel facies peridotites from the Kaapvaal root7th International Kimberlite Conference Abstract, pp. 100-102.South Africa, LesothoPeridotites - spinel, Deposit - Premier, Kimberley, Letseng, Frank Smith, Wel
DS1998-0178
1998
Budaev, D.A.Populational model of kimberlites: an application to diamondiferous kimberlite regions with geodynamics...7th International Kimberlite Conference Abstract, pp. 108-110.Russia, Yakutia, South Africa, West Africa, LesothoPetrochemistry, Kimberlite - composition
DS1998-0257
1998
Clarke, J., Sobie, P.A., Wilkes, T.A., Zweistra, P.The geology and economic evaluations of the Liqhobong kimberlites, Lesotho.7th International Kimberlite Conference Abstract, pp. 158-160.LesothoPetrology, Deposit - Liqhobong
DS1998-0592
1998
Harte, B., Hutchison, M.T., Lee, M., Harris, J.W.Inclusions of (Mg, Fe) O in mantle diamonds7th International Kimberlite Conference Abstract, pp. 308-10.South Africa, Australia, Zimbabwe, Brazil, LesothoTrace elements, mineralogy, Deposit - Sao Luiz, magnesium, iron
DS1998-0976
1998
McDade, P., Harris, J.W.Syngenetic inclusion bearing diamonds from Letseng la Terai, Lesotho7th International Kimberlite Conference Abstract, pp. 561-3.LesothoDiamond inclusions, Deposit - Letseng
DS1998-1385
1998
Southern African Development CommunityDiamonds in the SADC regionMineral Res. Surv. Prog., No. 3, 36p. 16p. appendicesSouth Africa, Swaziland, Tanzania, Zimbabwe, Angola, Botswana, LesothoAlluvial, marine diamond, kimberlite, paleoplacers, Diamond production, potential
DS1998-1453
1998
Taylor, W.R., Nimis, P.A single pyroxene thermobarometer for lherzolite chromium diopside and its application in diamond exploration.7th International Kimberlite Conference Abstract, pp. 897-8.Lesotho, AustraliaGeobarometry
DS1999-0459
1999
McDade, P., Harris, J.W.Syngenetic inclusion bearing diamonds from Letseng la Terai Lesotho7th International Kimberlite Conference Nixon, Vol. 2, pp. 557-65.LesothoDiamond - inclusions, Deposit - Letseng la Terai
DS1999-0675
1999
Skinner, E.M.W., Mahotkin, I.L., Grutter, H.S.Melilite in kimberlites7th International Kimberlite Conference Nixon, Vol. 2, pp. 788-94.South Africa, Lesotho, RussiaPetrology - melilite, Deposit - Finsch, Voorspoed, Lace, Swartruggen
DS2000-0212
2000
De Bruiyn, H., Schoch, Van der Westhuizen, MyburghPicrite from the Katse area, Lesotho: evidence for flow differentiationJournal of African Earth Sciences, Vol. 31, No. 3-4, pp. 657-88.LesothoPicrite, Geochemistry - magma
DS2001-0511
2001
Irvine, G.J., Pearson, D.G., Carlson, R.W.Lithospheric mantle evolution of the Kaapvaal Craton : a Rhenium- Osmium (Re-Os) isotope study of peridotite nodules kimberlitesGeophysical Research Letters, Vol. 28, No. 13, July 1, pp. 2505-08.LesothoGeochronology
DS2001-0796
2001
Moore, A.E., Lock, N.P.The origin of mantle derived megacrysts and sheared peridotites - evidence from kimberlites in northern ..African Journal of Earth Science, Vol. 104, No. 1, pp. 23-38.Lesotho, Orange Free State, South Africa, BotswanaPetrology - megacrysts, mineral chemistry, Genesis
DS2001-1033
2001
Schmitz, M., Bowring, S.Constraints on southern African lithospheric thermal evolution from uranium-lead (U-Pb) rutile titanite thermochronologySlave-Kaapvaal Workshop, Sept. Ottawa, 3p. abstractSouth Africa, LesothoXenoliths - lower crustal, Deposit - Newlands
DS2001-1079
2001
Simon, N.Origin of garnet and clinopyroxene in Kaapvaal low T peridotite xenoliths:implications from secondary ion..Slave-Kaapvaal Workshop, Sept. Ottawa, 5p. abstractSouth Africa, LesothoSIMS data, Geochemistry - major and trace elements
DS2003-0293
2003
Coussaert, N., Mercier, J-C., Demaiffe, D., Andre, L.Equilibrium conditions revisited for Lesotho kimberlites8 Ikc Www.venuewest.com/8ikc/program.htm, Session 6, AbstractLesothoMantle petrology, Pyroxene geothermometry
DS200412-0110
2003
Basson, I.J., Viola, G.Structural overview of selected Group II kimberlite dyke arrays in South Africa: implication for kimberlite emplacement merchaniSouth African Journal of Geology, Vol. 106, 4, pp. 375-394.Africa, South Africa, LesothoGeodynamics, genesis, Klipspringer, Helam, Star
DS200412-0379
2003
Coussaert, N., Mercier, J-C., Demaiffe, D., Andre, L.Equilibrium conditions revisited for Lesotho kimberlites.8 IKC Program, Session 6, AbstractAfrica, LesothoMantle petrology, pyroxxene geothermometry
DS200412-0722
2004
Griffin, W.L., Graham, S., O'Reilly, S.Y., Pearson, N.J.Lithosphere evolution beneath the Kaapvaal Craton: Re-Os systematics of sulfides in mantle derived peridotites.Chemical Geology, Vol. 208, 1-4, pp. 89-118.Africa, South Africa, LesothoGeochronology, Finsch, Kimberley, Jagersfontein
DS200412-1508
2004
Pearson, D.G., irvine, G.J., Ionov, D.A., Boyd, F.R., Dreibus, G.E.The Re Os systematics and platinum group element fractionation during mantle melt extraction: a study of massif and xenolith perChemical Geology, Vol. 208, 1-4, pp. 29-59.Africa, Lesotho, Namibia, MoroccoGeochronology, mantle melt extraction
DS200612-0380
2006
European Diamonds Plc.Interim financial report for the six months ended 31 December 2005.Mineweb, April 1, 5p.Africa, LesothoNews item - European Diamonds
DS200612-0496
2005
Gregoire, M., Rabonowicz, M., Janse, A.J.A.Mantle mush compaction: a key to understand the mechanisms of concentration of kimberlite melts and initiation of swarms of kimberlite dykes.Journal of Petrology, Vol. 47, 3, March, pp. 631-646,Africa, South Africa, Lesotho, BotswanaConvection, Kimberley, Rietfontein, Central Cape,Gibeon
DS200612-0526
2006
Hanson, E.K., Moore, J.M., Robey, J., Bordy, E.M., Marsh, J.S.Re-estimation of erosion levels in Group I and II kimberlites between Lesotho, Kimberley and Victoria West, South Africa.Emplacement Workshop held September, 5p. extended abstractAfrica, South Africa, LesothoCrustal xenoliths
DS200712-0669
2007
Maier, W.D., McDonald, I., Peltonen, P., Barnes, S-J., Gurney, J., Hatton, C.Platinum group elements in mantle xenoliths from the Kaapvaal Craton.Plates, Plumes, and Paradigms, 1p. abstract p. A614.Africa, South Africa, Botswana, LesothoKimberley, Jagersfontein, Lethlakane, Finsch, Venetia
DS200712-1175
2007
Woodland, A.B.Ferric iron in clinopyroxene from the garnet peridotite facies: systematics and partitioning behaviour.Plates, Plumes, and Paradigms, 1p. abstract p. A1127.Africa, South Africa, LesothoCrystal chemistry
DS200812-0484
2008
Hopp, J., Trieloff, M., Brey, G.P., Woodland, A.B., Simon, N.S.C., Wijbrans, J.R., Siebel, W., Reitter, E.40 Ar 39 Ar ages of phlogopite in mantle xenoliths from South African kimberlites: evidence for metasomatic mantle impregnation during Kilbaran orogenic cycle.Lithos, Vol. 106, no. 3-4, pp. 351-364.Africa, South Africa, LesothoDeposit - Bultfontein, Letseng, Liqhobong
DS200812-0485
2008
Hopp, J.,Trieloff, M.Noble gases in kimberlitic mantle: xenoliths from southern Africa.Goldschmidt Conference 2008, Abstract p.A390.Africa, South Africa, lesothoDeposit - Byltfontein, Finsch, Letseng
DS200812-0779
2008
Murphy, R.In the cut. Large diamonds from Letseng.W, Abstract in Gems & Gemology Summer p. 196., Vol. 37, 3, pp. 282-284.Africa, LesothoDiamonds notable
DS200812-0885
2008
Peslier, A.H., Woodland, A.B., Wolff, J.A.Fast kimberlite ascent rates estimated from hydrogen diffusion profiles in xenolithic mantle olivines from southern Africa.Geochimica et Cosmochimica Acta, Vol. 72, 11, June 1, pp. 2711-2722.Africa, Lesotho, South AfricaFTIR, magma
DS200912-0065
2009
Bowen, D.C., Ferraris, R.D., Palmer, C.E., Ward, J.D.On the unusual characteristics of the diamonds from Letseng La Terae kimberlites, Lesotho.Lithos, In press available 25p.Africa, LesothoDeposit - Letseng La Terae
DS200912-0240
2009
Galloway, M., Nowicki, T., Van Coller, B., Mukodzani, B., Siemens, K., Hetman, C., Webb, K., Gurney, J.Constraining kimberlite geology through integration of geophysical, geological and geochemical methods: a case study of the Mothae kimberlite, northern Lesotho.Lithos, In press - available 47p.Africa, LesothoDeposit - Mothae
DS200912-0305
2009
Hoal, K.O., Appleby, S.K., Stammer, J.G., Palmer, C.SEM based quantitative mineralogical analysis of peridotite, kimberlite and concentrate.Lithos, In press - available 20pAfrica, South Africa, Lesotho, BotswanaDeposit - Premier/Cullinan, Letseng, Ngamiland
DS201012-0371
2010
Kilalea, D.Gem Diamonds Limited ... downgrading on prices and grades.RBC Capital Markets, July 28, 4p.Africa, LesothoNews item - Gem Diamonds
DS201012-0372
2010
Kilalea, D.Letseng tender - expectations may have to fall.... average price $ 1,700.RBC Capital Markets, July 23, 1/4p.Africa, LesothoNews item - Gem Diamonds
DS201012-0373
2010
Kilalea, D.GEM: Letseng tender prices down - more diamonds from Main pipe parcel and more small goods.RBC Capital Markets, May 11, 1p.Africa, LesothoNews item - Gem Diamonds
DS201012-0374
2010
Kilalea, D.Letseng tender confirms rough diamond price strength.RBC Capital Markets, April 16, 1p.Africa, LesothoNews item - Gem Diamonds
DS201012-0375
2010
Kilalea, D.GEMD: disappointing results, but positive statements on expansion potential. Blin a and LetsengRBC Capital Markets, Aug. 28, 1/2p.Africa, Lesotho, AustraliaNews item - Gem Diamonds
DS201012-0376
2010
Kilalea, D.Gem Diamonds .... commentary.RBC Capital Markets, Sept. 13, 3p.Africa, Lesotho, AustraliaNews item - Gem Diamonds
DS201012-0466
2010
Mair, P., Konzett, J., Hauzenberger, Ch.Metasomatic titanates associated with Cl rich amphibole and phlogopite in a multiply metasomatized garnet lherzolite from Letseng la Terae Lesotho.International Mineralogical Association meeting August Budapest, abstract p. 525.Africa, LesothoMineral chemistry
DS201012-0625
2010
Richards, B., McClung, C.R., Voljoen, F.Characterization of the Kolo kimberlite pipe: constraints on the composition and genesis of the Diamondiferous lithospheric mantle below Kaapvaal.Geological Society of America Abstracts, 1/2p.Africa, LesothoDeposit - Kolo
DS201012-0859
2009
Woodland, A.B.Ferric iron contents of clinopyroxenes from cratonic mantle and partitioning behaviour with garnet.Lithos, Vol. 112 S pp. 1143-1149.Africa, Lesotho, South AfricaGeothermometry
DS201112-1019
2011
Sundvall, R., Stalder, R.Water in upper mantle pyroxene megacrysts and xenocrysts: a survey study.American Mineralogist, Vol. 96, 8-9, pp. 1215-1227.Africa, Lesotho, United States, ColoradoMineral chemistry
DS201212-0148
2012
Dawson, J.B., Lock, N.P.Contrasting peridotite xenoliths suites from the Letseng kimberlites: inferences for the Lesotho mantle.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractAfrica, LesothoDeposit - Letseng
DS201212-0233
2012
Gernon, T., Brown, R.J., Tait, M.A., Hincks, T.K.The origin of pellatal lapilli in explosive kimberlite eruptions.Nature Communcations, May 7p.Africa, South Africa, LesothoDeposit - Venetia, Letseng-la-Terae
DS201212-0355
2012
Kiflawi, I.,Weiss, Y., Navon, O.The IR absorption spectrum of water in Micro inclusions in diamonds.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractAfrica, Lesotho, Canada, Northwest Territories, RussiaDiamond inclusions
DS201212-0482
2012
Mitchell, R.H., Scott Smith, B.H., Skinner, E.M.W.Mineralogy of magmaclasts and interclast matrices of Kimberley-type pyroclastic kimberlites from the Kao, Letseng-La-Terae, Lethlakane and Premier kimberlite pipes of southern Africa.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractAfrica, Lesotho, South AfricaDeposit - Kao, Letseng, Lethlakane, Premier
DS201212-0527
2012
O'Brien, H.E., Birnie, A.C., Spencer, R.G.Diamondiferous megacrystal garnet and orthopyroxene from Liqhobong, Lesotho.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractAfrica, LesothoDeposit - Liqhobong
DS201212-0528
2012
O'Brien, H.E., Spencer, R.G.Lemphane kimberlite diamond project: petrology update.10th. International Kimberlite Conference Held Bangalore India Feb. 6-11, Poster abstractAfrica, LesothoDeposit - Lemphane
DS201212-0550
2012
Peslier, A.H., Woodland, A.B., Bell, D.R., Lazarov, M., Lapen, T.J.Metasomatic control of water contents in the Kaapvaal cratonic mantle.Geochimica et Cosmochimica Acta, Vol. 97, pp. 213-246.Africa, South Africa, LesothoDeposit - Finsch, Kimberley, Jagersfontein, Letseng, Liqhobong
DS201212-0665
2012
Skinner, E.M.W.A geological model of the Kao kimberlites, Lesotho, based on the petrography of limited samples.10th. International Kimberlite Conference Feb. 6-11, Bangalore India, AbstractAfrica, LesothoDeposit - Kao
DS201212-0682
2012
Sobie, P.Overview of Firestone diamonds's activities in Botswana and Lesotho.PDAC 2012, abstractAfrica, Botswana, LesothoDeposits
DS201312-0365
2013
Harte, B.Melt injections and metasomatism in the continental mantle lithosphere beneath southern Africa.Goldschmidt 2013, AbstractAfrica, South Africa, LesothoKimberley area, Matsoku
DS201312-0547
2013
Lock, N.P., Dawson, J.B.Contrasting garnet lherzolite xenoliths suites from the Letseng kimberlite pipes: inferences for the northern Lesotho geotherm.Proceedings of the 10th. International Kimberlite Conference, Vol. 1, Special Issue of the Journal of the Geological Society of India,, Vol. 1, pp. 29-44.Africa, LesothoDeposit - Letseng
DS201312-0558
2013
Lynn, M.Exploration of the Lemphane kimberlite in Lesotho.Geoforum , 17ppt. AvailableAfrica, LesothoDeposit - Lemphane
DS201312-0566
2013
Madowe, A.The mine planning process for an open pit diamond mining operation - a case study on Letseng diamond mine in Lesotho.South African Institute of Mining and Metallurgy, Vol. 113, July pp. 547-554.Africa, LesothoLetseng - mine plan
DS201312-0658
2013
Nowicki, T.Geology and evaluation of the Mothae kimberlite: another source of unusually large, high value diamonds in northern Lesotho, southern Africa.Vancouver Kimberlite Cluster, Talk Nov 8, 1/4p. AbstractAfrica, LesothoDeposit - Mothae
DS201312-0682
2013
Paragon Diamonds Inc.Lemphane kimberlite scoping summary study.Paragon Diamonds Inc., Summary April 13p.Africa, LesothoDeposit - Lemphane
DS201412-0356
2014
Hilchie, L., Fedortchouk, Y., Matveev, S., Kopylova, M.G.The origin of high hydrogen content in kimberlitic olivine: evidence from hydroxyl zonation in olivine from kimberlites and mantle xenoliths.Lithos, Vol. 202-203, pp. 429-441.Canada, Nunavut, Northwest Territories, Africa, LesothoDeposit - Jericho, Beartooth, Pipe 200, Matsoku
DS201412-0407
2014
International Resource JournalGem Diamonds the owner of the highest average dollar-per-carat kimberlite diamond mine in the world continues to defy expectations with its exceptionally large and high-value stones from Botswan and Lesotho.International Resource Journal, Jan. pp. 38-51.Africa, Botswana, LesothoGem Diamonds overview
DS201412-0409
2014
International Resource JournalFirestone Diamonds is close to realizing a high-grade, 15 year diamond operation in Lesotho with potential upside for high-value large stones.International Resource Journal, Jan. pp. 62-69.Africa, LesothoFirestone overview
DS201412-0535
2014
Lynn, M., Grimmer, S., Ferreira, J.The Motete kimberlite dyke, a new diamond occurrence in Lesotho.GSSA Kimberley Diamond Symposium and Trade Show provisional programme, Sept. 12, title onlyAfrica, LesothoDeposit - Motete
DS201412-0820
2014
Shor, R., Weldon, R.Diamonds from the roof of the world. Lesotho's Maluti Mountains.GIA, 7p.Africa, LesothoHistory
DS201412-0870
2013
Sommer, H., Wan,Y., Kroner, A., Xie, H., Jacob, D.E.Shrimp zircon ages and petrology of lower crustal granulite xenoliths from the Letseng-La-Terae kimberlite, Lesotho: further evidence for a Namaquanatal connection.South Africa Journal of Geology, Vol. 116, 2, pp. 183-198.Africa, LesothoDeposit - Letseng
DS201412-0967
2014
Ward, J.D., Bowen, D.C., Fourie, P., Ntsalong, L.The Kao kimberlite, Lesotho: main pipe - main mine?GSSA Kimberley Diamond Symposium and Trade Show provisional programme, Sept. 12, title onlyAfrica, LesothoDeposit - Kao
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
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.
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.
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
DS201609-1704
2010
Bornman, F.Letseng mine no. 2 plant project - a process engineering and design review.The 4th Colloquium on Diamonds - source to use held Gabarone March 1-3, 2010, 14p.Africa, LesothoDeposit - Letseng

Abstract: Bateman Engineering managed the establishment of a second diamond treatment plant at the Letseng Mine in the Mokhotlong District of northern Lesotho, about 100 km from the town of Buthe Buthe. Letseng Diamonds Proprietary Limited, is owned 70 % by Gem Diamonds and 30 % by the Government of the Kingdom of Lesotho. The second plant, which commenced construction in late 2006, doubled Letseng Mines' hard rock processing capacity from 2.6 million t/yr to 5.2 million t/yr, making it the worlds' seventh largest diamond mine by throughput. Bateman Engineering provided the engineering design, procurement and construction management of the new plant.
DS201702-0241
2017
Shor, R.Letseng: the challenges of a low yielding diamond resource ( Lesotho).PDAC 2017, March 6, 1p. AbstractAfrica, LesothoDeposit - Letseng

Abstract: Uneconomical two decades ago, the Letseng diamond mine in Lesotho is today a major source of 50-carat-plus Type IIa diamonds. It is also the lowest-yielding diamond mine in the world, averaging about 1.5 carats of diamonds per hundred tons of ore against an industry average of one carat per ton. First opened in 1975, the previous operators of the mine (Rio Tinto and De Beers) struggled to maintain its operation because very large diamonds were mixed in with its very low production. The mine closed in 1982 after seven years of loss-making operation. In the 2000’s, three changes profoundly affected the diamond industry: 1. The price of large diamonds appreciated very strongly compared to more commercial sizes and qualities, 2. Improvements in ore processing technology that reduces potential damage or outright destruction of large crystals, and 3. Improvements in X-Ray technology that enhances the ability to identify low fluorescence, Type IIa and fancy color diamonds. This technology also allows for identification of very large diamonds in kimberlite before primary crushing. Letseng reopened in 2006 and has been operating at a profit despite its very low yield and relatively low volume, of about 100,000 carats yearly. The company continues to upgrade its technology which resulted in the recovery of 90 diamonds larger than 50 carats last year. Letseng also serves as a model for other small “boutique” mines such as Kerowe, the Botswana operation which yielded the 1109 ct Lesedi la Rona diamond in 2015 and the Lulo concession in Angola which have come on line recently.
DS201708-1596
2017
Banas, A.Can microdiamonds be used to predict the distribution of large Type II a macrodiamonds? A case study of Letseng mine.11th. International Kimberlite Conference, PosterAfrica, Lesothodeposit - Letseng
DS201708-1669
2017
Hetman, C.Letseng diamond mine, Lesotho: a variant of kimberley-type pyroclastic kimberlite emplacement.11th. International Kimberlite Conference, OralAfrica, LesothoDeposit - Letseng

Abstract: The Letšeng Diamond Mine comprises two adjacent kimberlites, the Main and Satellite pipes. Very low grade and low frequency of high value stones preclude use of standard evaluation methods, increasing the need for high confidence geology models. New results of drillcore investigations, including core logging, country rock dilution measurements, indicator mineral abundances and petrography are integrated with open pit mapping and macrodiamond production data to present updated 3D geological models of the Main and Satellite pipes. Letšeng was emplaced ~90 Ma and forms part of a Cretaceous kimberlite province extending across southern Africa. The Letšeng bodies are steep-sided volcanic pipes that are infilled with multiple asymmetric phases of kimberlite separated by near-vertical, sharp, cross-cutting internal contacts. There are associated marginal carbonate-cemented country-rock breccias and sub-vertical kimberlite dykes that can occur within a zone of well-developed carbonate veining adjacent to the pipes. The pipe infills are dominated by kimberlite closely resembling Kimberley-type pyroclastic kimberlite (KPK; formerly tuffisitic kimberlite; Scott Smith et al. 2013) that contains common large megaxenoliths of massive and brecciated country rock basalt. Other textural varieties include hypabyssal kimberlite (HK), transitional HK-KPK and resedimented volcaniclastic kimberlite (RVK). Each phase of kimberlite represents a separate magmatic system. In each KPK there is a continuum of crystallization from the magmaclast selvages to the intermagmaclast matrix. As documented elsewhere, the HK-KPK transition involves an increasing (i) degree of deuteric replacement of olivine, (ii) amount of incorporated country rock xenoliths and (iii) textural modification of the magma prior to solidification subsurface within the diatreme. These conclusions negate some other proposed modes of emplacement.
DS201708-1718
2017
Mohapi. M.Letseng diamond mine, Lesotho: recent advances in open pit geology and the Main kimberlite pipe.11th. International Kimberlite Conference, PosterAfrica, Lesothodeposit - Letseng
DS201708-1726
2017
Nkotsi, T.Letseng diamond mine, Lesotho: recent advances in open pit geology and the satellite kimberlite pipe.11th. International Kimberlite Conference, PosterAfrica, Lesothodeposit - Letseng
DS201708-1742
2017
Rapopo, M.The Liqhobong kimberlite cluster: a perspective on the distinct geology, emplacement, dilution and diamond grades for each intrusion.11th. International Kimberlite Conference, PosterAfrica, Lesothodeposit - Liqhobong
DS201708-1743
2017
Rapopo, M.The geology of the Liqhobong main pipe kimberlite.11th. International Kimberlite Conference, PosterAfrica, Lesothodeposit - Liqhobong
DS201708-1750
2017
Schulze, D.Mg-metasomatized Fe-rich dunites from the Thaba Putsoa kimberlite, Lesotho: headstones in a kimberlite graveyard.11th. International Kimberlite Conference, PosterAfrica, Lesothodeposit - Thaba Putsoa
DS201708-1772
2017
Stamm, N.The petrology and mineralogy of the kimberlite blow in Letseng la Terae: implications for its parental magma.11th. International Kimberlite Conference, PosterAfrica, Lesothodeposit - Letseng la terae
DS201709-2024
2016
Madowe, A.Design and implentation of steeper slope angles on a kimberlite open pit diamond operation - a practical approach.South African Institute of Mining and Metallurgy, Vol. 116, 8, pp. 723-731.Africa, Lesothodeposit - Letseng

Abstract: The steepening of slope angles on an open pit mining operation has a material impact on improving the economics of mining. Steepening of slope angles can also increase the risk of slope failure. Slope failures are inherently costly events, because they can be catastrophic, resulting in multiple fatalities, equipment damage, and temporary or permanent closure of a mine. The steepening of the basalt slope angles at Letseng Diamond Mine followed operational improvements that were introduced through improved blasting practices and geotechnical controls. The steeper slope design resulted in a 6 Mt/a reduction in the peak waste mining compared with the previous mine plan coupled with an increase in the net present value and life of mine. This paper is an outline of the steps that were taken at Letseng to increase slope angles in waste and the resulting improvements to the mine plan.
DS201710-2231
2017
Hetman, C.Highland Gems: Letseng, Kao, Mothae, Monastery11th International Kimberlite Field Trip Guide, Sept. 59p. PdfAfrica, Lesothodeposit - Letseng, Kao, Mothae, Monastery
DS201808-1782
2018
Rapopo, M., Sobie, P.The Liqhobong kimberlite cluster: an update on the geology.Mineralogy and Petrology, doi.org/10.1007/s00710-018-0624-5 12p.Africa, Lesothodeposit - Liqhobong

Abstract: The Cretaceous Liqhobong kimberlite cluster comprises at least six known diamondiferous Group 1 kimberlite bodies; namely the circular Main Pipe (8.5 ha), ovoid Satellite Pipe (1.6 ha), Discovery Blow (0.15 ha), Blow (0.1 ha), the Main Dike adjoining the blows and pipes, and one other recently exposed dike. The kimberlites intrude Jurassic Drakensberg lavas and outcrop at ~2650 masl in rugged Maluti Mountain terrain, and are emplaced along a strike of about 2.5km. The cluster represents at least three episodes of structurally controlled kimberlite intrusion; the first which comprised the dike(s?) and the two blows (the blows being dike enlargements emplaced 1km apart) and later the two separate emplacements of the Main and Satellite Pipes.
DS201810-2381
2018
Stamm, N., Schmidt. M.W., Szymanowski, D., von Quadt, A., Mohapi, T., Fourie, A.Primary petrology, mineralogy and age of the Letseng-la-Terae kimberlite ( Lesotho), southern Africa) and parental magmas of Group 1 kimberlites.Contributions to Mineralogy and Petrology, Vol. 173, pp. 76- doi.org/10.1007/ s00410-018-1502-1Africa, Lesothodeposit - Letseng

Abstract: The Letšeng-la-Terae kimberlite (Lesotho), famous for its large high-value diamonds, has five distinct phases that are mined in a Main and a Satellite pipe. These diatreme phases are heavily altered but parts of a directly adjacent kimberlite blow are exceptionally fresh. The blow groundmass consists of preserved primary olivine with Fo86?88, chromite, magnesio-ulvöspinel and magnetite, perovskite, monticellite, occasional Sr-rich carbonate, phlogopite, apatite, calcite and serpentine. The bulk composition of the groundmass, extracted by micro-drilling, yields 24-26 wt% SiO2, 20-21 wt% MgO, 16-19 wt% CaO and 1.9-2.1 wt% K2O, the latter being retained in phlogopite. Without a proper mineral host, groundmass Na2O is only 0.09-0.16 wt%. However, Na-rich K-richterite observed in orthopyroxene coronae allows to reconstruct a parent melt Na2O content of 3.5-5 wt%, an amount similar to that of highly undersaturated primitive ocean island basanites. The groundmass contains 10-12 wt% CO2, H2O is estimated to 4-5 wt%, but volatiles and alkalis were considerably reduced by degassing. Mg# of 77.9 and 530 ppm Ni are in equilibrium with olivine phenocrysts, characterize the parent melt and are not due to olivine fractionation. 87Sr/86Sr(i)?=?0.703602-0.703656, 143Nd/144Nd(i)?=?0.512660 and 176Hf/177Hf(i)?=?0.282677-0.282679 indicate that the Letšeng kimberlite originates from the convective upper mantle. U-Pb dating of groundmass perovskite reveals an emplacement age of 85.5?±?0.3 (2?) Ma, which is significantly younger than previously proposed for the Letšeng kimberlite.
DS201910-2290
2019
Phamotse, K.M., Nhleko, A.S.Determination of optimal fragmentation curves for a surface diamond mine. LiqhobongThe Journal of the Southern African Institute of Mining and Metallurgy, Vol. 199, pp. 613-620.Africa, Lesothodeposit - Liqhobong

Abstract: Liqhobong Mining Development Company (LMDC) has been experiencing problems with boulders after blasting where the fragment sizes exceed the maximum of 800 mm as per mine standard. As a result, the mine has employed various methods to improve the fragmentation. The goal is to produce a run-of-mine (ROM) feed that does not choke the crusher and cause delays in production. In order to achieve this goal, fragmentation distribution within the fines and coarse envelope must be optimized through effective planning of blasting activities and accurate execution. The mine determined the fines-coarse envelope within which the entire crushing system can handle fragments using Split Desktop software. It is expected that both the predicted and actual fragmentation curves lie within that envelope for optimal fragmentation. The Kuz-Ram model with blast design parameters of 2.6 m for burden, 2.8 m for spacing, and 127 mm hole diameter was used to predict the fragmentation. The results show that the blast design parameters may need altering to achieve optimum fragmentation. Furthermore, the execution of the drilling and blasting may be the cause of the fragmentation problems. The mean fragmentation size (X50) differs greatly, unlike the uniformity index (n)s values which are relatively close to each other (0.6 to 2.2). The mean squared error (MSE) values have a large range. A proposed solution is a modified burden, spacing, and hole diameter. It is concluded that blast design parameters need to be reviewed in order to obtain correct predictions.
DS202003-0352
2020
Moore, A.,Yudovskaya, M., Prover, A., Blenkinsop, T.Evidence for olivine deformation in kimberlites and other mantle derived magmas during crustal emplacement. LemphaneContributions to Mineralogy and Petrology, Vol. 175, 9p. PdfAfrica, Lesothoolivine

Abstract: This paper highlights published and new field and petrographic observations for late-stage (crustal level) deformation associated with the emplacement of kimberlites and other mantle-derived magmas. Thus, radial and tangential joint sets in the competent 183 Ma Karoo basalt wall rocks to the 5 ha. Lemphane kimberlite blow in northern Lesotho have been ascribed to stresses linked to eruption of the kimberlite magma. Further examples of emplacement-related stresses in kimberlites are brittle fractures and close-spaced parallel shears which disrupt olivine macrocrysts. In each of these examples, there is no evidence of post-kimberlite regional tectonism which might explain these features, indicating that they reflect auto-deformation in the kimberlite during or immediately post-emplacement. On a microscopic scale, these inferred late-stage stresses are reflected by fractures and domains of undulose extinction which traverse core and margins of some euhedral and anhedral olivines in kimberlites and olivine melilitites. Undulose extinction and kink bands have also been documented in olivines in cumulates from layered igneous intrusions. Our observations thus indicate that these deformation features can form at shallow levels (crustal pressures), which is supported by experimental evidence. Undulose extinction and kink bands have previously been presented as conclusive evidence for a mantle provenance of the olivines—i.e. that they are xenocrysts. The observation that these deformation textures can form in both mantle and crustal environments implies that they do not provide reliable constraints on the provenance of the olivines. An understanding of the processes responsible for crustal deformation of kimberlites could potentially refine our understanding of kimberlite emplacement processes.
DS202004-0528
2019
Nestola, F., Pasqualetto, L., Wang, W.The new nickel sulfide mineral crowningshieldite found within a superdeep diamond from Letseng.GSA Annual Meeting Phoenix, 1p. AbstractAfrica, LesothoDeposit - Letseng

Abstract: By virtue of their exceptionally deep origin and unique geological histories, diamonds have been found to contain a variety of minerals that are otherwise rare or absent at Earth’s surface. During examination of a type IIa diamond sample from the Letseng mine, Lesotho, a new nickel sulfide mineral was found as part of a fine-grained multiphase inclusion. This nickel sulfide is the natural analogue of the synthetic nickel monosulfide known as ?-NiS, with a NiAs-type structure. This new mineral has been named crowningshieldite, after G.R. Crowningshield (1919 - 2006), whose many years of innovation at the Gemological Institute of America produced countless advances in the understanding and identification of natural, treated and synthetic diamonds and other gem materials. Crowningshieldite is the high-temperature polymorph of millerite, with an inversion temperature of 379 °C from previous experiments on pure NiS. The observed sample of crowningshieldite has an empirical formula of (Ni0.90Fe0.10)S. The host diamond is gemmy, colorless, and relatively pure (type IIa, containing less than ~5 ppm nitrogen). It belongs to a variety of sublithospheric/superdeep diamonds named CLIPPIR diamonds that are notable for their metallic Fe-Ni-C-S melt inclusions. In this case, the inclusion is interpreted to be an alteration assemblage produced when a primary metallic Fe-Ni-C-S inclusion with a surface-reaching fracture reacted with hot fluids, likely associated with kimberlite emplacement. Other phases identified in association with crowningshieldite in this fine-grained alteration assemblage are magnetite-magnesioferrite, hematite, and graphite. Unexposed inclusions within the same diamond are of original, unaltered Fe-Ni-C-S composition. The new mineral crowningshieldite is a good example of the complexity and breadth of geological processes recorded within diamonds and their inclusions.
DS202008-1421
2019
McKechnie, W.F.Diamond exploration and mining in southern Africa: some thoughts on past, current, and possible future trends.The Journal of the Southern African Insitute of Mining and Metallurgy, Vol. 119, Feb, 9p. PdfAfrica, South Africa, Zimbabwe, Namibia, Angola, DRC, Lesotho, Botswana, eSwatiniproduction

Abstract: Southern Africa is generally thought to be well explored, with only limited potential for major new diamond discoveries. However, Chiadzwa in Zimbabwe and reports of a significant new kimberlite find in Angola are testimony to the dangers attached to an attitude that 'there is nothing left to find'. Since the major discoveries in the central interior of South Africa in the 1870s, diamond exploration in the region has been led by market and political factors that influence the key exploration drivers of opportunity and value proposition. Unexpected new discoveries by new players always impact on existing producers and, from time to time, denial of opportunity through political or protectionist policies has inhibited investment in exploration. Entrepreneurial exploration appetite in southern Africa will be tempered by the potential value equation and security of investment. Overlaid on this, developments in diamond recovery technologies provide opportunity to reinvigorate current mines and old prospects previously considered too difficult or costly to exploit. Position on the cost curve will remain a key factor for survival in an increasingly competitive environment.
DS202009-1663
2020
Smith, E.M., Nestola, F., Pasqualetto, L., Zorzi, F., Secco, L., Wang, W.The new mineral crowningshieldite: a high temperature NiS polymorph found in a type IIa diamond from the Letseng mine, Lesotho.The American Mineralogist, in press available, 33p. PdfAfrica, Lesothodeposit - Letseng
DS202103-0409
2021
Smith, E.M., Nestola, F., Paqualetto, L., Zorzi, F., Secco, L., Wang, W.The new mineral crowningshieldite: a high temperature NiS polymorph found in a type IIa diamond from the Letseng mine, Lesotho.American Mineralogist, Vol. 106, pp. 301-308. pdfAfrica, Lesothodeposit - Letseng

Abstract: Crowningshieldite is the natural analog of the synthetic compound ?-NiS. It has a NiAs-type structure and is the high-temperature polymorph relative to millerite (?-NiS), with an inversion temperature of 379 °C. Crowningshieldite is hexagonal, space group P63/mmc, with a = 3.44(1) Å, c = 5.36(1) Å, V = 55.0(2) Å3, and Z = 2. It has an empirical formula (Ni0.90Fe0.10)S and dcalc = 5.47(1) g/cm3. The five strongest lines in the powder X-ray diffraction data are [dmeas in angstroms (I) (hkl)]: 1.992 (100) (102), 1.718 (55) (110), 2.978 (53) (100), 2.608 (35) (101), and 1.304 (17) (202). Crowningshieldite was found as part of a multiphase inclusion in a gem-quality, colorless, type IIa (containing less than ~5 ppm N) diamond from the Letseng mine, Lesotho. The inclusion contains crowningshieldite along with magnetite-magnesioferrite, hematite, and graphite. A fracture was observed that extended from the inclusion to the diamond exterior, meaning that fluids, possibly kimberlite-related, could have penetrated into this fracture and altered the inclusion. Originally, the inclusion might have been a more reduced, metallic Fe-Ni-C-S mixture made up of cohenite, Fe-Ni alloy, and pyrrhotite, akin to the other fracture-free, pristine inclusions within the same diamond. Such metallic Fe-Ni-C-S primary inclusions are a notable recurring feature of similar type IIa diamonds from Letseng and elsewhere that have been shown to originate from the sublithospheric mantle. The discovery of crowningshieldite confirms that the ?-NiS polymorph occurs in nature. In this case, the reason for its preservation is unclear, but the relatively iron-rich composition [Fe/(Fe+Ni) = 0.1] or the confining pressure of the diamond host are potential factors impeding its transformation to millerite. The new mineral name honors G. Robert Crowningshield (1919-2006) (IMA2018-072).
DS202104-0593
2021
Marshall, T., Ward, J.D., de Wit, M.C.Alluvial diamond deposits across Africa - a travelogue.Geological Society of South Africa presentation, https://www.youtube.com/watch?v=1tsWuXo6fB4&t=23sAfrica, Lesotho, Cote d'Ivoire, Democratic Republic of Congo, Tanzania, Angola, South Africa, Ghana, Mauritania, Zimbabwe, Namibia, Central African Republic, Cameroon, Swaziland, Mali, Sierra Leone, Liberia, Guineaalluvials
DS202110-1627
2021
McIntyre, T., Kublik, K., Currie, C., Pearson, G.Heat generation in cratonic mantle roots - new trace element constraints from mantle xenoliths. And implications for cratonic geotherms.Geochemistry, Geophysics, Geosystems, 10.1029/2021GC009691 55p. PdfAfrica, South Africa, Lesotho, Europe, Greenlandcraton

Abstract: Understanding the rate at which temperature changes with increasing depth (geothermal gradients) within ancient continental crust and its underlying mantle (cratonic lithosphere) is essential for understanding the internal structure of Earth. However, understanding geothermal gradients requires a chemical and physical understanding of deep cratonic lithosphere (up to ?200 km depth) and samples from such depths are only available as fragments hosted in melts that originate there (e.g., kimberlites). This limited sample availability of the cratonic mantle roots has resulted in some properties of this domain, used in geothermal modeling, to be poorly constrained. Here we use samples of cratonic mantle lithosphere to determine one critical and poorly constrained parameter used in modeling geothermal gradients—the heat produced from the radiogenic decay of K, U, and Th to their daughter isotopes. We measure these elements in the samples via in situ laser ablation methods to quantify their potential heat production. Comparing our results to previous estimates of heat production, our new estimates produce differences in the thicknesses of cratonic lithosphere calculated from modeled geothermal gradients by >10 km depending on the chosen lithological model. The results from this study provide an important new data set for constraining heat production in cratonic mantle peridotites.
DS202201-0008
2021
Celestian, A.JNew mineral names: diamonds, dumps and fumaroles.: crowningshieldite.American Mineralogist, Vol. 106, p. 208 1/4p.Africa, LesothoCLIPPIR - Letseng

Abstract: In this series of New Mineral Names, a thematic approach is used to help provide context for advances and discoveries in mineralogy. Planet Earth is ever-changing, and unique crystals are found in the tiniest of micro-geologic niches. With emerging analytical techniques, the formerly inaccessible becomes accessible. New minerals inspire creative approaches to overcoming chemical and technological challenges and can reveal what the Earth was like billions of years ago. In this issue, we look at recently described minerals that are associated with diamonds, dumps, and fumaroles: crowningshieldite, goldschmidtite, breyite, cardite, grimmite, hrabákite, freitalite, dioskouriite, dobrovolskyite, ferroefremovite, and vasilseverginite.
DS202201-0041
2021
Smith, E.Exploration implications of isotopically heavy iron in large gem type IIa diamonds.GAC/MAC Meeting UWO, 1p. Abstract p. 279.Africa, LesothoCLIPPIR - Letseng

Abstract: Large, high-quality type IIa diamonds such as the Cullinan and the Koh-i-Noor are among the most elusive of mined gem diamonds. These are called CLIPPIR diamonds, an acronym reflecting the distinguishing physical characteristics of this variety of diamonds (Cullinan-like, Large, Inclusion Poor, Pure, Irregular, Resorbed) [1]. There is currently no reliable method to predict the occurrence of CLIPPIR diamonds in a deposit, which remains a hurdle for exploration and mining [2]. Mineral inclusions reveal that these are sublithospheric diamonds [1], which explains why their occurrence is effectively independent from more common eclogitic and peridotitic lithospheric diamonds and their associated indicator minerals. More recently, an analysis of iron isotopes in the metallic inclusions sometimes found in CLIPPIR diamonds has provided additional insight into their formation, which may provide clues for exploration. Three measurements of metallic Fe-Ni-C-S inclusions from two diamonds from the Letseng mine, Lesotho reveal remarkably heavy iron isotopic compositions, ?56Fe = 0.79-0.90‰ [3]. These measurements lie far outside the range of known mantle compositions (near 0‰) or expected reaction products at depth. Instead, the heavy signature is ascribed to subducted iron sourced from magnetite and/or Fe-Ni alloys precipitated during seafloor serpentinization of oceanic peridotite. These metallic inclusions provide physical evidence that traces serpentinite subduction into the mantle transition zone. This finding is a step toward a genetic model for CLIPPIR diamonds. Their formation requires input from deeply subducted serpentinized peridotite. Furthermore, this input may come specifically from cold subducting slabs, whose serpentinized mantle portions can bypass the shallow sub-arc dehydration activity and instead transport serpentinite-derived components such as hydrous minerals and iron-rich phases to the transition zone/uppermost lower mantle [4]. The results suggest that geochemical signatures related to deeply subducted serpentinites may eventually provide a basis for targeting CLIPPIR diamonds in volcanic deposits at surface.
 
 

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