 | | Journal (article/letter/editorial) | | FROM THE ONVERWACHT AND TWEEFONTEIN ULTRAMAFIC PIPES, EASTERN BUSHVELD COMPLEX, SOUTH AFRICA FEDERICA...Witwatersrand, PO Wits 2050, South Africa ABSTRACT The ultramafic pipes of Onverwacht and Tweefontein, in the...the eastern part of the Bushveld Complex, in South Africa, contain small xenoliths of chromitite that...Complex, Republic of South Africa. SOMMAIRE Les pipes ultramafiques de Onverwacht et Tweefontein, dans...The Merensky Reef in the Bushveld Complex, in South Africa, was discovered at about the same time (1924) |  | | Report (issue) | | SURVEY OF SOUTH AFRICA COUNCIL FOR GEOSCIENCE GEOLOGICAL SURVEY OF SOUTH AFRICA MINERALOGY OF SOUTH AFRICA:... COUNCIL FOR GEOSCIENCE GEOLOGICAL SURVEY OF SOUTH AFRICA Scientific Editor R.D. Dixon Linguistic and...Council for Geoscience (Geological Survey of South Africa), 280 Pretoria Street, Silverton, Pretoria or........................... 69 5.1 Overview of South African Occurrences ..............................LAYEREDSUITE,BUSHVELDCOMPLEX.... 111 MINERALOGY OF SOUTH AFRICA: TYPE-MINERAL SPECIES AND TYPE-MINERAL NAMES |  | | 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 Ā© 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...In our previous contributions on the Driekop, Onverwacht, and Twyfelaar localities we noted that despite |  | | 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 Ā© 2004 Geological Society of South Africa ABSTRACT...are emplaced in the Upper Critical zone, the Onverwacht and Twyfelaar pipes occur in the Lower Critical...evaluation and mining of the Driekop, Mooihoek and Onverwacht pipes, which are among the oldest platinum mines...comparatively deep-rooted, stock-like bodies. At Onverwacht and Twyfelaar, the stocks are rimmed by irregular |  | | Journal (article/letter/editorial) | | PLATINUM-GROUP MINERALS FROM THE BUSHVELD COMPLEX, SOUTH AFRICA T. OBERTHĆR Bundesanstalt fĆ¼r Geowissenschaften...ac.at Ā© 2014 December Geological Society of South Africa ABSTRACT The present work provides an initial...Complex, and from eluvial concentrations at the Onverwacht platiniferous pipe. During a field campaign,...transport. The eluvial material collected at Onverwacht contained ca. 150 PGM grains with sizes mainly...PGM assemblage described previously from the Onverwacht pipe proper, including the type locality minerals |  | Oberthur, T., Melcher, F., Gast, L., Wohrl, C., Lodziak, J. (2004) DETRITAL PLATINUM-GROUP MINERALS IN RIVERS DRAINING THE EASTERN BUSHVELD COMPLEX, SOUTH AFRICA. The Canadian Mineralogist, 42 (2) 563-582 doi:10.2113/gscanmin.42.2.563 | Journal (article/letter/editorial) | | RIVERS DRAINING THE EASTERN BUSHVELD COMPLEX, SOUTH AFRICA THOMAS OBERTHĆRĀ§, FRANK MELCHER, LOTHAR GAST...placer, Maandagshoek, eastern Bushveld Complex, South Africa. SOMMAIRE Lors de nos campagnes de terrain...between 2 and 3 km wide and runs approximately northāsouth, subparallel to the layering of the Mafic Phase...underlain by the Critical Zone. Between the Atok mine and Steelpoort (Fig. 2), the layered sequence dips 10ā15Ā°...Maandagshoek (Fig. 2). Accordingly, both a north- and a south-flowing Moopetsi River are present. In the area |  | | Journal (article/letter/editorial) | | illustrating the nature of Archean volcanismin southern Africa and elsewhereare made available for purposesof...mineralization. The Archean mineralization of southern Africa is briefly compared and contrasted with that of...the easternpart southern Africa. of Botswana, the northeasternsegment of South The purposes of this paperare...paperare, briefly,to consider Africa, and Rhodesia,the shield consistsof two crathe nature and distribution...GREENSTONE BELT LITHOLOGICAL UNITS RHODESIA/BOTSWANA SOUTH AFRICA/SWAZILAND Sedimentary unit ShamraJah Mafic-to-l'el$ic |  | | Journal (article/letter/editorial) | | of the discorthe famous Driekop, Mooihoek, and Onverwacht dant bodies of ultramarie rock have a detrimental...DISCORDANT BODIES 1113 To the north of the Steelpoort valley in the The platiniferouscore zone in the...iron-richultramaficpegmatiteare abun- Mooihoek, and Onverwacht, aswell as a subeconomic dant in the upper critical...bodies are particularly abundantin the that the Onverwacht pipe resulted from in situ areasadjacentto the...and southern Irvine (1982) suggestedthat the Onverwacht pipe sectorsof the easternBushveldComplex.In |  | | Journal (article/letter/editorial) | | concentrates originating from the Driekop platinum mine, South Africa, collected and first described by E. F. Stumpfl...interpretation of Rudashvesky et al. (1992) for the Onverwacht and Mooihoek pipes: a high-temperature magmatic...of discovery are summarize d in Table 1. The Onverwacht platiniferous pipe is the type locality of tetraferroplatinum...crosscutting the Upper Critical Zone, and the Onverwacht and Twyfelaar pipes in the Lower Critical and...(Driekop, Mooihoek), or by magnesian harzburgite (Onverwacht, Twyfelaar). The PGE mineralization is concentrated |  | | Journal (article/letter/editorial) | | GEOLOGICAL EXCURSION TO THE MINING AREAS OF SOUTH AFRICA by Aberra Mogessie, Christoph Hauzenberger...Department of Geology, University of the Free State, South Africa 1. Preface Almost a year ago Aberra Mogessie...(where we had organized past excursions) and South Africa. Having discussed the matter with Christoph...areas of South Africa. We contacted Christoph Gauert from the University of Free State, South Africa to help...help us with the local organization especially to get permission from the different mining companies to |  | | Journal (article/letter/editorial) | | University of the Witwatersrand, PO Wits, 2050, South Africa CHRISTOPHER A. LEEĀ¶ Anglo Platinum Geology...Department, PO Box 62179, Marshalltown, 2107, South Africa ROBERT P. SCHOUWSTRA Anglo Platinum Research...1412, South Africa PETER MELLOWSHIP Impala Platinum Mines, PO Box 5683, Rustenburg, 0300, South Africa...and eastern limbs of the Bushveld Complex, in South Africa. Grades for the mined reef interval are uniform...km of strike length, at 5ā7 g/t, except for Union mine, where it is currently 8 g/t. The relative proportions |  | | 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 Ā© 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...Bushveld Complex, South Africa and are situated to the north of the small town of Steelpoort (Figure 1a)....the platiniferous pipes, Driekop, Mooihoek, and Onverwacht, are internationally famous as they are among |  | OāDriscoll, B., Clay, P. L., Cawthorn, R. G., Lenaz, D., Adetunji, J., Kronz, A. (2014) Trevorite: Ni-rich spinel formed by metasomatism and desulfurization processes at Bon Accord, South Africa?. Mineralogical Magazine, 78 (1) 145-163 doi:10.1180/minmag.2014.078.1.11 | Journal (article/letter/editorial) | | and desulfurization processes at Bon Accord, South Africa? B. OāDRISCOLL1,*, P. L. CLAY2, R. G. CAWTHORN3...University of the Witwatersrand, PO Wits, 2050 South Africa Dipartimento di Geoscienze, Trieste University...maļ¬cultramaļ¬c lavas of the Barberton Greenstone Belt (South Africa). Though now completely mined out, it comprised... metasomatism, desulfurization, Bon Accord, South Africa. Introduction TREVORITE is a rare Ni-rich spinel...Mineralogical Society ~144 Ma Morokweng crater (South Africa), in a paragenesis that also contains unusual |  | | Report (issue) | | 161(2) Z=8 X-ray Powder Pattern: Onverwacht mine, South Africa. 2.265 (100), 3.020 (90), 1.934 (60)...3.41 38.96 Total 100.64 99.47 (1) Onverwacht mine, South Africa; by electron microprobe, corresponds...mertieite-II, PtāFe alloy, chromite (Onverwacht mine, South Africa); osmium, PtāPdāCu alloy, hollingworthite...ruthenian pentlandite, chromite (Shetland Islands, Scotland). Distribution: In South Africa, in the Merensky...Merensky Reef, Bushveld complex, Transvaal, at the Onverwacht [TL] and Driekop mines. From the Joubdo stream |  | | Journal (article/letter/editorial) | | found in Pt concentratesfrom the Driekop mine, South Africa. Other data on hollingworthite are derived...(Tarkian and Stumpfl, 1975) and the Onverwacht mine, South Africa (Genkin, 1968). Hollingworthite is also...parageneses with magnetite and with serpentine and pentlandite interstitial to chromite in the Bird River Sill...types. A disseminatedpyrrhotite + chalcopyrite + pentlandite + cubanite assemblageenriched in PGE occurs in... and sulfides. The sulfides are pyrrhotite, pentlandite, chalcopyrite, and cubanite. Pyrrhotite containing |  | | Journal (article/letter/editorial) | | SteynsdorpGoldfield, Barberton Mountain Land, South Africa R. P. VILJOEN',R. S^AGER,Aā¢rD M. J. Vā¢tJOEN...The Barberton Mountain Land of the Republic of South Africa representsa typical early Precambriangreenstonebelt...Tā¢- Barberton Mountain Land of the Republic of South Africa, constitutesa typical early Precambrian greenstonebelt...of meta-volcanicsoverlain by sediments,the whole South African Upper Mantle Publication No. 12. succession...Middle M. J. Viljoen and R. P. Viljoen as part of South Marker. Above this marker, which constitutesthe |  | | Journal (article/letter/editorial) | | University] at 17:41 09 June 2016 TaEnaleh, Norilāsk District, Siberia, Russia U ntil a few years ago, the...fact, this find and a historical locality in South Africa for which specimens are not available represented...most common platinum mineral. It occurs with pentlandite, chalcopyrite, and pyrrhotite in sulfide ores...layered intrusive bodies such as the Bushveld (South Africa) and Stillwater (Montana) Complexes. In addition...Great Eastern mine, Clark County, Nevada. It is an ore mineral in the active Pt-Pd mine and related occurrences |  | | Journal (article/letter/editorial) | | tectonics, magmatism, and mineralisation of the South African Precambrian shield is discussed. A geosynclinal...five times as long as the post-Precambrian. The South African shield appears highly suitable for investigations...preserved and well exposed. The Precambrian in southern Africa comprises a more or less continuous suite ofmetasediments...of more than 35,000 m. Furthermore, in southern Africa the earth's history, at least in outline, appears...mineralisation. There is hardly anywhere else in Africa an orogenic zone to which this applies. Recent |  | | Journal (article/letter/editorial) | | Mineralization in Hortonolitic Dunites of the Mooihoek and Onverwacht Pipes, Bushveld Complex N. S. Rudashevsky 1,...platiniferous hortonolitic dunites of the Mooihoek and Onverwacht pipes, Bushveld Complex, show the following PGM...amphiboles, magnetite, chlorite, ilmenite, and pentlandite. Fine (less than 0.1 ram) drop-like sulfide inclusions...troilite, ferruginous chalcopyrite, ferruginous pentlandite, and encircled by micrograins of magnetite, ilmenite... in den Horthonolit-Duniten der Mooihoek und Onverwacht Pipes, Bushveld-Komplex Minerale der Platingruppe |  | | Report (edition) | | bookseller 1936 Price 3s. Net IMPERIAL INSTITU1Ā·Ā·E SOUTH KENSINGTON, S.W. 7 Ts E~ Imperial Institute was...Protecto1Ā·ate .. Southe1n Rhodesia ā¢ ā¢ ā¢ ā¢ Union of South Africa ā¢ ā¢ ā¢ ā¢ Canada .. ā¢ā¢ ā¢ ā¢ ā¢ ā¢ Newfoundland ā¢...Empire, especially in Canada and the Union of South Africa. During 1913, Russia was responsible for over...the list of producers of the platinum metals. South Africa has large reserves of platinum ore, and is the...as in the alluvial gold workings of the Choco district, it was usually thrown away as worthless, although |  | | Journal (article/letter/editorial) | | com/loi/tigr20 Ruthenium- and rhodium-containing pentlandite - an indicator of hydrothermal mobilization of...Muravitskaya (1976) Ruthenium- and rhodium-containing pentlandite - an indicator of hydrothermal mobilization of...At: 20:16 Ruthenium- and rhodium-containing pentlandite an indicator of hydrotl ermal mobilization of...lection of A. G. Betekhtin) permitted us to find pentlandite with high content of Ru and Rh and to find for...minerals are found in areas enriched in chromite. Pentlandite and irarsite occur in the p e r i Ā pheral part |  | | Journal (article/letter/editorial) | | mposed of fine, eutecticlikeintergrowths of pentlandite,pyrite, and chalcopyrite,occasionally even with...generallybeconcentratecollectedfrom the Driekop mine in 1957 lieved that potholeswere formed by volatile...concentratewere of extremely large size, namely Driekop Mine (after Stumpfl,1961) from 100 g up to 1 mm (Tarkian...parameterspertaining to the platinum- Pyrrhotite Pentlandite group element mineralogy in order to assistthe...regarded as a secondarymineral derived from pentlandite in ultramafic rocksduring processes of serpentinization |  | | Journal (article/letter/editorial) | | in ore deposits--alloys, braggitevysotskite, pentlandite and pyrrhotite. The system Pt-Pd-Fe-As-S involves...pyrrhotite, ross monosulphide solid solution, pn pentlandite 310 E. Makovicky et al. with the sulphide...percent of other interstitial phases, PdS, ross or pentlandite. The high-temperature polymorph of Ni a +xS2...making the resulting texture exceedingly complex. Pentlandite is a common product 312 E. Makovicky et al...it is a clear quench product. However, some pentlandite-containing associations are more problematic |  | | Report (issue) | | 991 Z=4 X-ray Powder Pattern: Merensky Reef, South Africa. 2.295 (100), 1.202 (100), 1.408 (90), 0.9153...28.28 17.70 Total 99.42 (1) Merensky Reef, South Africa; by electron microprobe, corresponding to (Pt1...Reef, South Africa). Association: Atokite, unspecified platinum tellurides (Merensky Reef, South Africa);...Africa); moncheite, pyrrhotite, pentlandite (Stillwater complex, Montana, USA). Distribution: In the Rustenburg...Atok, and Onverwacht mines, on the Merensky Reef, Bushveld complex, Transvaal, South Africa. From the |  | | Report (issue) | | ___________________________________ _ Sudbury district _______________________ ~ Discovery and present...lacers-------------------------------Tulameen district __________________ _ Other placers ______________________...provinces ___________________________ _ Republic of South Africa ___ ------------- __ -----Transvaal and Orange...ores ____________ _ Placers of the Witwatersrand district __ History and production _____________ _ General...---------------N oril'sk district ____________ -----_---- _____ _ Petsamo district ___________________________ |
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