 | | Journal (article/letter/editorial) | | bodies Roger N. Scoon PO Box 2461, Rivonia 2128, South Africa e-mail: rnscoon@iafrica.com Andrew A. Mitchell...4000, South Africa e-mail: mitchell@pixie.udw.ac.za © 2004 Geological Society of South Africa ABSTRACT...in the Upper Critical zone, the Onverwacht and Twyfelaar pipes occur in the Lower Critical and Lower zones...deep-rooted, stock-like bodies. At Onverwacht and Twyfelaar, the stocks are rimmed by irregular bodies of...metre-sized crystals of hornblende, phlogopite, and Ti-magnetite-ilmenite, the latter being derived from the alteration |  | | Journal (article/letter/editorial) | | ROGER N. SCOON† P.O. Box 2461, Rivonia 2128, South Africa AND ANDREW A. MITCHELL School of Geology,...KwaZulu-Natal, Private Bag 54001, Durban 4000, South Africa Abstract Discordant ultramafic bodies are a...significant feature of the Bushveld Complex, South Africa. Many of these bodies form subvertical, cylindrical...probably more abundant in the Bushveld Complex, South Africa (Fig. 1) than is generally realized. The original...Boshkoppies; 8 = Grootkuil; 9 = Middellaagte. Ti magnetite pipes (Willemse, 1969).1 The iron-rich ultramafic |  | | Journal (article/letter/editorial) | | REPLACED MERENSKY REEF AT THE AMANDELBULT MINE, SOUTH AFRICA R.N. SCOON Department of Geology, Rhodes...Rhodes University, Grahamstown 6140, South Africa e-mail: rnscoon@iafrica.com A.A. MITCHELL School of Geological...4000, South Africa e-mail: mitchaa@mweb.co.za © 2011 March Geological Society of South Africa ABSTRACT...in the eastern limb of the Bushveld Complex, South Africa, differ sufficiently from one another to warrant...contributions on the Driekop, Onverwacht, and Twyfelaar localities we noted that despite the pipes being |  | Scoon, Roger N., Mitchell, Andrew A. (2019) Discussion of “Oxygen isotope and trace element compositions of platiniferous dunite pipes of the Bushveld Complex, South Africa - Signals from a recycled mantle component?” by Günther, T., Haase, K.M., Junge, M., Oberthür, T., Woelki, D., and Krumm, S. Lithos, 324. 893-898 doi:10.1016/j.lithos.2018.09.023 | Journal (article/letter/editorial) | | platiniferous dunite pipes of the Bushveld complex, South Africa - Signals from a recycled mantle component?”...platiniferous dunite pipes of the Bushveld complex, South Africa - Signals from a recycled mantle component?”...platiniferous dunite pipes of the Bushveld Complex, South Africa - Signals from a recycled mantle component?”...University, Grahamstown 6140, South Africa 2 PO Box 421, McGregor 6708, South Africa MA NU SC 1 TE D...platiniferous dunite pipes of the Bushveld Complex, South Africa in many respects. The attempt to suggest there |  | | Journal (article/letter/editorial) | | Geology, Rhodes University, Grahamstown 6140, South Africa e-mail: rnscoon@iafrica.com A.A. MITCHELL Department...Durban 4000, South Africa e-mail: mitchaa@mweb.co.za © 2010 June Geological Society of South Africa ABSTRACT...as it is the site of the oldest platinum mine in South Africa. The central part of the pipe consists of...grains of apatite, and meter-sized lumps of Ti-magnetite-ilmenite were reported as prominent accessories...dunite pipes, Driekop, Mooihoek, Onverwacht, and Twyfelaar, are restricted to a 20-km linear belt in the |  | | Journal (article/letter/editorial) | | DISCUSSION Discussion of “The Bushveld Complex, South Africa: formation of platinum–palladium, chromeand...layers (platinumgroup element (PGE) reefs and Ti-magnetite layers) and some discordant (pipe) ore deposits...of Geology, Rhodes University, Grahamstown, South Africa e-mail: rnscoon@iafrica.com A. A. Mitchell School...KwaZulu-Natal, Private Bag X54001, Durban 4000, South Africa De Klerk, Canad Mineral 25:51–77, 1987) and...drained downward due to their high density. The Ti-magnetite pipes (Willemse 1969b) are probably best interpreted |  | | Journal (article/letter/editorial) | | Complex, South Africa R.N. Scoon Department of Geology, Rhodes University, Grahamstown 6140, South Africa...Geology, Rhodes University, Grahamstown 6140, South Africa Department of Earth, Environmental and Planetary...Operations South Africa, Rustenburg, South Africa © 2017 June Geological Society of South Africa Abstract...Abstract The 2055 Ma Bushveld Complex, South Africa, is well known for the occurrence of discordant bodies...mined out for a central core of vanadium-rich Ti-magnetite. Discordant bodies are particularly abundant in |  | | Journal (article/letter/editorial) | | ultramafic pegmatite at the Amandelbult Platinum mine, northwestern Bushveld Complex R. N. SCOON1,* 1...2128, South Africa Department of Geology, Rhodes University, PO Box 94, Grahamstown 6140, South Africa...pegmatite are described from the Amandelbult Platinum mine in the northwestern part of the Bushveld Complex...are divided into three groups, disseminated Ti-magnetite, disseminated Fe-Ti-Cr spinel and massive Fe-Ti-Cr...compositions intermediate between chromite and Ti-magnetite. A relationship was found between stratigraphic |  | | Journal (article/letter/editorial) | | distributed throughout the Bushveld itc, Ti magnetite,and accessorybase metal sulfide 0361-0128/85/419/1109-2052...ultramarierock should clinopyroxene, ilmenite,and Ti magnetite,with acbe consideredas separatefeaturesuntil convincing...normally observed although hybrid chromite-Ti magnetite spinel may occur. The nature of the pyroxene(orthopyroxene...critical and main zonesbut appear body on the farm Twyfelaar (Fig. 1). They are composite,pipelike bodieswhich...in the caseof the largest cluster occurs farther south on the farms Tweefontein body on AnnexGrootboom |  | | Journal (article/letter/editorial) | | concentrates originating from the Driekop platinum mine, South Africa, collected and first described by E. F. Stumpfl...the Upper Critical Zone, and the Onverwacht and Twyfelaar pipes in the Lower Critical and Lower Zones, are...Mooihoek), or by magnesian harzburgite (Onverwacht, Twyfelaar). The PGE mineralization is concentrated in cylindrical...closed in first description 1930, but the Driekop mine was re-opened by Otavi Mining between 1956 and 1958...stannides from concentrates of the Driekop mine, South Africa. Sample R4_BSE8 b Analysis 93 Mineral fp |  | Maier, W. D., Barnes, S.-J., Groves, D. I. (2013) The Bushveld Complex, South Africa: formation of platinum–palladium, chrome- and vanadium-rich layers via hydrodynamic sorting of a mobilized cumulate slurry in a large, relatively slowly cooling, subsiding magma chamber. Mineralium Deposita, 48 (1) 1-56 doi:10.1007/s00126-012-0436-1 | Journal (article/letter/editorial) | | 1007/s00126-012-0436-1 ARTICLE The Bushveld Complex, South Africa: formation of platinum– palladium, chrome- and...mines, 2 Union platinum mine, 3 Impala platinum mines, 4 Rustenburg platinum mine, 5 Western platinum and...mines, 6 Crocodile River mine, 7 Messina platinum mine, 8 Atok platinum mine, 9 Maandagshoek section with...with Modikwa platinum mine, 10 Mineral Range and Sheba’s Ridge deposit, 11 Rooipoort, Moorddrift, and...its economically important PGE, chromite and magnetite mineralization is presented. Finally, some implications |  | | Journal (article/letter/editorial) | | PIPE, EASTERN LIMB OF THE BUSHVELD COMPLEX, SOUTH AFRICA R.N. SCOON Postnet Suite 291, Private Bag X31...Durban 4000, South Africa e-mail: mitchaa@mweb.co.za © 2009 June Geological Society of South Africa ABSTRACT...on the basis of detailed mapping and sampling of mine workings that are not generally accessible. The...of the eastern limb of the Bushveld Complex, South Africa and are situated to the north of the small town...and Mitchell, 2004b), whereas the lesser known Twyfelaar pipe proved uneconomic (Wagner, 1929). The Mooihoek |  | | Book (volume) | | IRON-ORE SUPPLIES OF THE WORLD). PART 2.-BRITISH AFRICA. LONDON: PRINTED & PUBLISHED BY HJS MAJES'l'Y'S...Union of South Africa : Transvaal Cape Province ... ... PAGE 5 • 6 Natal 23 23 South-West Africa...38 Swaziland ... 47 British East and Central Africa :Kenya Uganda Tanganyika Nyasaland ... Egypt and... Introduction. Iron ore is known to occur extensively in Africa, but up to the present a considerable part of the...The chief deposits in British Africa are in the Union of South Africa, while Northern and Southern Rhodesia |  | | Journal (article/letter/editorial) | | University of the Witwatersrand, P.O. Wits 2050, South Africa e-mail: Grant.cawthorn@wits.ac.za; rais.latypov@wits...University of the Witwatersrand, P.O. Wits 2050, South Africa Geological Office, Marikana Mining Operations...0284, South Africa e-mail: Andiswe.vuthuza@lonmin.com © 2018 September Geological Society of South Africa...upward. The composition of the proposed liquid SOUTH AFRICAN JOURNAL OF GEOLOGY 2018 • VOLUME 121.3 PAGE...Upper Zone contains those same minerals plus magnetite, sequentially joined by olivine and apatite. Not |  | | Journal (article/letter/editorial) | | constitutethe world'slargestknownchro- farms Twyfelaar 119 KT, Driekop 253 KT, and mite deposits. Various...of the mineralogicaland chemical KT; by studiesin mine workingson Jadglust418 evolutionof the Critical...basedon de- Zone is given by outcrops,drill holes,and mine 845 846 2 g*45 ' E. N. CAMERON 3 0'00' 30'15'...another in the floor of the adit at the Winterveld mine, but the lower- most part of the sectionis basedon...present. Olivine grains range from 1.6 to dated Lands mine on Doornbosch, the footwall of 4.0 mm in diameter |  | | Book (edition) | | OF OF SOUTH AFRICA MINES GEOLOGICAL SURVEY MINERAL RESOURCES OF REPUBLIC OF THE SOUTH AFRICA...Second World War, and partly as a result of it, South Africa experienced vast industrial expansion. This...official ‘handbook on the mineral resources of South Africa, it has become necessary to revise, or rather...great diversity and magnitude of South African mineral deposits and local mining operations, the Economic...Chamber of Mines of South Africa with Mr G. H. Grange as co-ordinator, and the South, African mining industry; |  | | Report (issue) | | Publications, Ltd., Gardenvale, Que. ; in the Union of South Africa from Central News Agency, Ltd., P.O. Box 1033...by tho High Commis sioner for the Union of South Africa. Professor V. G. Shepheard, R.C.N.C., nominated...Leone Southern Rhodesia Tanganyika Union of South Africa . . Canada Newfoundland British North Borneo...66 67 69 70 70 71 71 74 Vi PAGE French West Africa Madagascar Cuba .. Costa Rica Guatemala Puerto...deposits in Southern Rhodesia, the Union of South Africa, and India. The chief foreign producers are |  | | Report (issue) | | Platinum Symposium in Rustenburg, Republic of South Africa. The abstract volume for this meeting contained...mineralization, in countries like the Republic of South Africa, Canada, and Finland. Over the last five or...platinum-group minerals (PGM) beginning with a South African publication (Cabri, 1972) and culminating...of PGE deposits, ranging from the very important South African deposits to less well-developed PGE mineralization...of South Africa Lyndon, Washington College Park, Maryland Johannesburg, Republic of South Africa Kansas |  | | Book | | Sciences University of Cape Town Rondebosch, South Africa ISSN 2510-1307 ISSN 2510-1315 (electronic)...Azurite crystals, partly replaced by malachite, Tsumeb mine, Namibia; width of view ca. 3 cm; collection H.E...the Medieval Latin word mina = shaft (minare = to mine). The antique people, e.g., the Greeks and Romans...periclase, MgO, uraninite (7 Sect. 7.4), spinel, magnetite, chromite (7 Sect. 7.2), and the garnet group...moment results. 5 In ferrimagnetic crystals, like magnetite Fe2+Fe23+O4, the magnetic moments of the substructures |  | | Book | | Using examples from the Bushveld complex of South Africa and other intrusions, this book provides a comprehensive...314–321, 3rd Floor, Plot 3, Splendor Forum, Jasola District Centre, New Delhi – 110025, India 79 Anson Road...denote a silicate liquid produced specifically by the local melting of pre-existing crystals. The terms volatile...sill-like intrusions such as the Bushveld Complex in South Africa that is up to 9 km thick and extends over 50...grains owing to variations in grain size or the local environment a crystal finds itself. Classical interpretations |
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