 | Smith, C.B., Allsopp, H.L., Garvie, O.G., Kramers, J.D., Jackson, P.F.S., Clement, C.R. (1989) Note on the UPb perovskite method for dating kimberlites: Examples from the Wesselton and De Beers mines, South Africa, and Somerset Island, Canada. Chemical Geology: Isotope Geoscience section, 79 (2). 137-145 doi:10.1016/0168-9622(89)90016-x | Journal (article/letter/editorial) | | kimberlites: Examples from the Wesselton and De Beers mines, South Africa, and Somerset Island, Canada C.B. SMITH’...American Research Laboratories, Crown Mines 2025 (South Africa) 3Department of Geology, University of Zimbabwe...0001 (South Africa) ‘Anglo American Corporation, Johannesburg 2000 (South Africa) 2050 (South Africa)...kimberlites: Examples from the Wesselton and De Beers mines, South Africa, and Somerset Island, Canada. Chem....Wesselton kimberlite and one of two De Beers Mine samples, while a second De Beers sample gave a younger age of |  | | Journal (article/letter/editorial) | | Kimberlite-hosted diamond deposits of southern Africa: A review Matthew Field a,⁎, Johann Stiefenhofer...Hole Wells, Somerset, BA5 1DN, United Kingdom De Beers Group Services (Pty) Limited, Mineral Resource... 2135, South Africa c De Beers Group Services, PO Box 47, Kimberley, South Africa d De Beers Canada Inc...deposits in central South Africa in the mid nineteenth century, it was at Kimberley where the volcanic...industrial development of southern Africa. Following the discoveries at Kimberley, even more valuable deposits |  | | Journal (article/letter/editorial) | | collection of 107 diamond crystals was cataloged by Count de Bournon in 1815. Another early British collector...assembled a suite of nine crystals for Mlle. Eleanore de Raab in 1791. In the 20th century, Paul Seel (1904–1982)...dynasty (320–298 B.C.) who regulated an active local diamond trade (Maillard, 1980). Legends associated... Figure 4. A diamond crystal in “blue ground” from South Africa, probably from the collection of Gardner and...Hyderabad, and the only modern producing diamond mine in India exploits the Majhgawan lamproite pipe near |  | | Book (volume) | | ALPHEUS F. WILLIAMS, B.Sc. GENERAL MANAGER OF DE BEERS CONSOLIDATED J\llNES1 LIMITED VOL. I. I ERNEST...rise and development of the diamond mines of South Africa, from an historical, economic and technical...an historical account of the development of the De Beers group of diamond mines, together with an account...days on the diamond fields when the mines in the Kimberley and Jagersfontein areas were the only diamond...collect during my many visits to all parts of South Africa where kimberlite deposits occurred and the filing |  | | Journal (article/letter/editorial) | | sequence and magma evolution of the De Beers dyke (Kimberley, South Africa) Ashton Soltys 1 & Andrea Giuliani...the De Beers dyke, a contemporaneous, composite intrusion bordering the De Beers pipe (Kimberley, South...South Africa). Petrographic features and mineral compositions indicate the following stages in the evolution...metasomatism in the mantle (i.e., high Cr-Ti phlogopite); (2) entrainment of wall-rock material during...monticellite, calcite micro-phenocrysts, kinoshitalite-phlogopite, barite, and baddeleyite) and the mesostasis |  | Giuliani, Andrea, Soltys, Ashton, Phillips, David, Kamenetsky, Vadim S., Maas, Roland, Goemann, Karsten, Woodhead, Jon D., Drysdale, Russell N., Griffin, William L. (2017) The final stages of kimberlite petrogenesis: Petrography, mineral chemistry, melt inclusions and Sr-C-O isotope geochemistry of the Bultfontein kimberlite (Kimberley, South Africa) Chemical Geology, 455. 342-356 doi:10.1016/j.chemgeo.2016.10.011 | Journal (article/letter/editorial) | | geochemistry of the Bultfontein kimberlite (Kimberley, South Africa) Andrea Giuliani, Ashton Soltys, David...geochemistry of the Bultfontein kimberlite (Kimberley, South Africa), Chemical Geology (2016), doi:10.1016/j...the SC RI PT Bultfontein kimberlite (Kimberley, South Africa) Andrea Giuliani1,2,3*, Ashton Soltys1...Ryde, Department of Earth Sciences, VU Amsterdam, De Boelelaan 1085, 1081 HV CE 3 PT 2019 NSW, Australia...(BK) from the Bultfontein kimberlite (Kimberley, South MA Africa). Sample BK consists of abundant macrocrysts |  | | Journal (article/letter/editorial) | | 3b7S02.W;O Ultramafic nodules from the Kimberley pipes, South Africa F. R. BOYD Geophysical Laboratory, Carnegie...from the Kimberley pipes differ from suites collected in a number of other areas in southern Africa in two...low-temperature (< 1100°C) peridotites from the Kimberley pipes have textures ranging from coarse to fluidal...mosaic-porphyroclastic. In most nodule suites from southern Africa and elsewhere in the world, these low-temperature...Petrographic and electron microprobe study of the Kimberley peridotites shows that they are depleted in basaltic |  | | Book | | Phase 5. Sample Treatment D) World Production E) South African Diamond Occurrences 1. Large Kimberlite...Finsch 1.4 Kimberley 1.5 Koffiefontein 2. Smaller mineralised kimberlites in South Africa 2.1 The Oaks... their relative production contributions in South Africa were, primary (kimberlite) 8.63 million carats...suggest approximately 40% for the Kimberley mines and 55% for Premier mine. The proportion of gems in the...deposits is over 98%. The MIBA mine in the Congo and the Argyle mine in Australia have an average gem |  | WHITE, J. L., SPARKS, R. S. J., BAILEY, K., BARNETT, W. P., FIELD, M., WINDSOR, L. (2012) KIMBERLITE SILLS AND DYKES ASSOCIATED WITH THE WESSELTON KIMBERLITE PIPE, KIMBERLEY, SOUTH AFRICA. South African Journal of Geology, 115 (1) 1-32 doi:10.2113/gssajg.115.1.1 | Journal (article/letter/editorial) | | ASSOCIATED WITH THE WESSELTON KIMBERLITE PIPE, KIMBERLEY, SOUTH AFRICA J.L. WHITE, R.S.J. SPARKS, K. BAILEY Department...seroster99@hotmail.com © 2012 March Geological Society of South Africa ABSTRACT Field relations, petrography and bulk...complex exposed in water tunnels at Wesselton Mine, Kimberley. The sill complex, together with associated...of calcite, perovskite, spinel, serpentine and phlogopite, with variations from rocks rich in olivine microphenocrysts...pseudomorphed olivine, replaced calcite, apatite and phlogopite in the groundmass and thereby changed the bulk |  | | Journal (article/letter/editorial) | | PERIDOTITE NOTE ON THE OF KIMBERLEY, VICTOR DIAMOND-BEARING SOUTH AFRICA. HARTOG. WITa x BmLIOORA•'a¾...first calledon to assumethe dutiesof surveyorat the De Beersmine in SouthAfrica the writer of this paperfelt...examination. During a stay of threeyears,however,at the mine, from a careful comparisonof publisheddescriptions...study could not have been extended to all of the South African pipes but it is believedthat the presentdescriptionwill...north, south, east, west and center of certain working levelsin the De BeersMine, Kimberley, South Africa |  | | Journal (article/letter/editorial) | | from 16 intrusions in Lesotho, the Republic of South Africa, and Tanzania have been investigated. The following...material studied (especially the zircons from the Kimberley mines) was subangular in shape, with one or a...Zircons from the Kimberley group of intrusions (i.e., Kimberley, Dutoitspan, De Beers, Wesselton and Bultfontein...bronzite that are found in the kimberlites of northern Lesotho also show some fractures and cracks (NlxoN...with respect to the abundance of zircon in the Kimberley and Frank Smith mines, he admitted that zircon |  | | Report (chapter) | | mantle events and diatreme ascent rates in southern Africa and Malaita, Solomon Islands JO-ANNE WARTHO* &...mantle. With the realization that some Ar/Ar phlogopite grain core ages may be indicative of geological...xenoliths and megacrysts from Kimberley, Monastery and Letseng in southern Africa, and Malaita, in the Solomon...Solomon Islands, to test whether other mantle phlogopite cores may yield meaningful ages. Modelling of Ar...Ar diffusive loss profiles from phlogopite grain boundaries to cores provides information on both the |  | | Book (volume) | | we live on. The previous conferences were held at Cape Town (1973), Santa Fe, New Mexico (1977), Clermont-Ferrand...Araxa, Brazil (1991), Novosibirsk, Russia (1995), Cape Town (1998), Victoria, Canada (2003) and Frankfurt...of Dharwar Craton in South India, (ii) lamproites of Bundelkhand Craton in northern India and (iii) diamond...He obtained a B.Sc. (Hons) from the University of Cape Town in 1986 and a Ph.D. in metamorphic petrology...Glasgow. For over 30 years, he was a consultant to De Beers Consolidated Mines, managing their worldwide outside |  | | Journal (article/letter/editorial) | | Department of Geochemistry University of Cape Town, Republic of South Africa arro R. V. DnNcurrq2 Anglo-American...ResearchLaboratory Crown Mines, Johannesburg, Republic of South Africa Abstract Two new opaquemineralsare describedfrom...Presentaddress: Stockdale Prospectint-Ltd., 60 Wiison Street, South yarra, Victoria 3141,Australia. 0003-004x/83/0505-M94$02...Associatedcharacteristic minerals are K-richterite, phlogopite, Nb-Cr-rutile and Nb-CrMg-ilmenite,togetherwith...Hageerty (1975) from the De Beers kimberlite in the Republic of South Africa (RSA) and the mineral has |  | | Journal (article/letter/editorial) | | University of the Witwatersrand, Johannesburg 2001 (South Africa) (Received April 5, 1982; revised and accepted...(see Fig. 1 for localities); of these, five (the Kimberley pipes and Monastery) are certainly post-Karroo...of southern Africa with localities of pipes studied (1 = Kimberley , including De Beers, Bultfontein...pipes in Kimberley (Cape Province, South Africa): Wesselton, Dutoitspan, Bultfontein and De Beers. These...have been determined on samples from the Wesselton Mine (Allsopp and Barrett, 1975) and Bultfontein (Kramers |  | Lim, Emilie, Giuliani, Andrea, Phillips, David, Goemann, Karsten (2018) Origin of complex zoning in olivine from diverse, diamondiferous kimberlites and tectonic settings: Ekati (Canada), Alto Paranaiba (Brazil) and Kaalvallei (South Africa) Mineralogy and Petrology, 112. 539-554 doi:10.1007/s00710-018-0607-6 | Journal (article/letter/editorial) | | (Canada), Alto Paranaiba (Brazil) and Kaalvallei (South Africa) Emilie Lim 1 & Andrea Giuliani 1,2 & David... Tres Ranchos-04), and the Kaapvaal craton, South Africa (Kaalvallei: Samada, New Robinson). Olivine...lower Mg/Fe rims are correlated with increased phlogopite and Fe-bearing oxide mineral abundances. There...by carbonates (e.g., Armstrong et al. 2004) to phlogopite-rich examples (e.g., Downes et al. 2006; Taylor...localities: Grizzly and Koala (Ekati property), Lac de Gras, Canada; Limpeza-18 and Tres Ranchos-04, Alto |  | | Journal (article/letter/editorial) | | age of the East Peripheral kimberlite at De Beers Mine, Kimberley, R.S.A. F. J. FITCH & J. A. MILLER Summary...Summary. The kimberlite pipe at De Beers Mine, Kimberley is a complex, multiple structure. Three concordant...emplacement-cooling of the East Peripheral kimberlite at De Beers Mine was close to 86 + 2 Ma. 1. Introduction The...the dating sample. It is possible that the De Beers Mine kimberlite may have two or more pipe-forming...has a roughly pipe-shaped geometry. Work by the De Beers Geology Department (C. R. Clements, pers. comm |  | | Journal (article/letter/editorial) | | Constraints on kimberlite ascent mechanisms revealed by phlogopite compositions in kimberlites and mantle xenoliths...Keywords: Kimberlite Phlogopite Zoning Magma ascent Mantle xenoliths Kimberley a b s t r a c t Kimberlite...of kimberlite melts remain poorly constrained. Phlogopite is one of the few minerals that preserves a history...compositional data for phlogopite from the Bultfontein kimberlite (Kimberley, South Africa; i.e. the kimberlite...type-locality) and from entrained mantle xenoliths. Phlogopite macrocrysts (~ N 0.3–0.5 mm) and microcrysts |  | Naidoo, P., Stiefenhofer, J., Field, M., Dobbe, R. (2004) Recent advances in the geology of Koffiefontein Mine, Free State Province, South Africa. Lithos, 76 (1) 161-182 doi:10.1016/j.lithos.2004.04.032 | Journal (article/letter/editorial) | | the geology of Koffiefontein Mine, $ Free State Province, South Africa P. Naidoo a,b,*, J. Stiefenhofer...Dobbe c a De Beers Koffiefontein Mine, South Africa De Beers Mineral Resource Management, CHQ, South Africa...Africa c De Beers Geoscience Centre, South Africa d De Beers Central Mines, South Africa e De Beers Mineral...pipe has contributed to the marginal nature of the mine. The key to this is the presence of a large zone...stability and adversely affects the economics of the mine. D 2004 Elsevier B.V. All rights reserved. Keywords: |  | Ogilvie-Harris, R. C., Field, M., Sparks, R. S. J., Walter, M. J. (2009) Perovskite from the Dutoitspan kimberlite, Kimberley, South Africa: implications for magmatic processes. Mineralogical Magazine, 73 (6) 915-928 doi:10.1180/minmag.2009.073.6.915 | Journal (article/letter/editorial) | | Perovskite from the Dutoitspan kimberlite, Kimberley, South Africa: implications for magmatic processes R...lithofacies from the Dutoitspan pipe, Kimberley, South Africa, which range from diamondiferous to barren...from the Dutoitspan kimberlite pipe, Kimberley District, South Africa. Data on the chemistry of perovskites... PEROVSKITE FROM THE DUTOITSPAN KIMBERLITE, SOUTH AFRICA kite, hypothesizing that Fe will increasingly...kimberlite is located in the Kimberley cluster, (Kimberley District of South Africa). Clement (1982) identified |  | | Book | | Project of Energy, Mines, and Resources, Canada; and De Beers Consolidated Mines are acknowledged for financial............................... 126 5.3.3.2. West Africa ........................................... 126.... . . . . . . . . . . . . . . . . . . . 6.6. Phlogopite . . . . . . . . . . . . . . . . . . . . . . ...Macrocryst Phlogopite (Paragenesis 1) ..................... 6.6.2. Groundmass/Microphenocryst Phlogopite (Paragenesis...11. 6.12. 6.13. 6.14. 6.15. 6.6.3 .1. Diverse South African Kimberlites (Dawson and Smith 1975, Smith |  | | Journal (article/letter/editorial) | | com/locate/lithos Kimberlites of the Man craton, West Africa E.M.W. Skinner a,*, D.B. Apter b, C. Morelli b...Rhodes University, Grahamstown 6140, South Africa b DeBeers, South Africa c Mano River Resources, Canada Received...craton in West Africa is an Archaean craton formerly joined to the Guyana craton (South America) that...kimberlites are mineralogically classified as phlogopite kimberlites, although potassium contents are...the presence of abundant early crystallizing phlogopite is considered to have had an effect on the relatively |  | | Journal (article/letter/editorial) | | from 17 kimberlite localities from SC southern Africa, Canada, Greenland and Russia. These data show...kimberlite locality, cluster (e.g., Kimberley) and, potentially field (e.g., Lac de Gras), form a single compositional...compositions of olivine rims in kimberlites from SC Lac de Gras that were emplaced as hypabyssal root-zones...different areas suggest contribution from a range of local processes, such as variable source composition,...filtering PT E 3.3. Canada D 3.2. Southern Africa 3.4. West Greenland CE 3.5. Russia 4. Origin |  | | Journal (article/letter/editorial) | | Sciences, Macquarie University, North Ryde, 2109, New South Wales, Australia 3 Centre for Microscopy, Characterisation...Eocene archetypal kimberlites from southern Africa, Lac de Gras (Canada) and Alto Paranaiba (Brazil),...in the source of kimberlites from southern Africa, Lac de Gras and Alto Paranaiba, or that the recycled...kimberlites and related megacrysts from southern Africa revealed elevated 206 Pb/204Pb ratios (Smith...observation and argument applies to kimberlites from Lac de Gras (Canada) of Cretaceous to Eocene age (Tappe |  | | Book (volume) | | ALPHEUS F. WILLIAMS, B.Sc. GENERAL JIIANAGER OF DE BEERS CONSOLIDATED MINES, LIMITED VOL. II. I 9 3 2...DIAMOND-BEARING ALLUVIAL GRAVELS OF THE UNION OF SOUTH AFRICA DIAMOND-BEARING GRAVELS DRAINAGE WEATHERING...SYSTEMS THE ORIGIN OF THE ALLUVIAL DIAMONDS THE SOUTH-WEST AFRICA DIAMOND DEPOSITS THE VAAL RIVER ALLUVIAL GRAVELS...Plate No. 96. THIN SECTION (359, X 12) FONTEIN MINE BRONZITE PERIDOTITE FROM JAGERS facing page 368...following plate MINE THIN SECTION (8, x 12) BRONZITE PERIDOTITE FROM BuLTFONTEIN 98. MINE ,, ,, 99. THIN |
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