 | | 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...relatively large grains of sperrylite and hollingworthite with minor laurite associated with the altered...Complex, Republic of South Africa. SOMMAIRE Les pipes ultramafiques de Onverwacht et Tweefontein, dans |  | | 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 |  | 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 OBERTHÜR§, 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 north–south, 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 10–15°...Maandagshoek (Fig. 2). Accordingly, both a north- and a south-flowing Moopetsi River are present. In the area |  | | Journal (article/letter/editorial) | | PLATINUM-GROUP MINERALS FROM THE BUSHVELD COMPLEX, SOUTH AFRICA T. OBERTHÜR Bundesanstalt für Geowissenschaften...ac.at © 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...many rarer PGM including stibiopalladinite, hollingworthite, laurite, PGE arsenides and PGE sulfides. The |  | | 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...minerals, including geversite (Stumpfl 1961) and hollingworthite (Stumpfl & Clark 1965, Stumpfl 1972). Aided...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 |  | | Journal (article/letter/editorial) | | University, Ottawa KIS 5B6, Canada Ansrru,cr Hollingworthite from a deposit rich in copper sulfides in olivine...trends: Ir- and As-rich hollingworthite is progressivelyzoned to pure hollingworthite (RhAsS) followed by...zoning cannot result from simple exsolution of hollingworthite from interstitial magmatic sulfide; it is interpreted...Pt-group elementsat different times. INrnooucrroN Hollingworthite (RhAsS),definedby Stumpfl and Clark (1965)...concentratesfrom the Driekop mine, South Africa. Other data on hollingworthite are derived from specimensfrom |  | | Report (issue) | | Crystal Data: Cubic. Point Group: 2/m 3. hollingworthite or laurite. As grains, to 1 mm, and intergrown...= 5.777 Z=1 X-ray Powder Pattern: Onverwacht mine, South Africa. 3.32 (100), 2.87 (100), 1.74 (100)...11.47 Total 98.3 98.7 100.42 (1) Driekop mine, South Africa; by electron microprobe, corresponding to...series with hollingworthite. Cobaltite group. Occurrence: In chromite in hortonolite dunite (South Africa);...Pt-group alloys. Association: Platinum, ruthenian hollingworthite, sperrylite, laurite, iridarsenite, ruthenarsenite |  | | Journal (article/letter/editorial) | | deposits from the Bayerischer Wald, SE Germany: hollingworthite and ferroan platinum Harald G. Dill, Berthold...iridium-rhodium-arsenic sulfide (irarsite-hollingworthite s.s.s.), sperrylite, platinum-iron-, iridium-osmium-...The morphology of cubic crystals of irarsite-hollingworthite s.s.s is characterized by “chaotic forms” ...communication Fig. 2. Rhodium-enriched member of the hollingworthite-irarsite- solid-solution series and its associated...aggregate of hollingworthite with the hexahedron prevailing over the rhombohedron b) Hollingworthite-dominated |  | | Report (issue) | | Driekop mine, South Africa; by electron microprobe, corresponds to Pt1.00 Sb1.84 . (2) Onverwacht mine, South...South Africa; by electron microprobe, corresponds to Pt1.00 (Sb1.66 Bi0.29 As0.04 )Σ=1.99 (3) PtSb2 ....ultramafic rocks (Driekop mine, South Africa). Association: Platinum, gold, hollingworthite, sperrylite, stibiopalladinite...stibiopalladinite, chalcopyrite, pyrrhotite (Driekop mine, South Africa); vozhminite, heazlewoodite, tučekite, magnetite...copper (Vozhmin massif, Russia). Distribution: In South Africa, in the Merensky Reef, Bushveld complex, Transvaal |  | | Report (issue) | | Hollingworthite (Rh, Pt, Pd)AsS c 2001-2005 Mineral Data Publishing, version 1 Crystal Data: Cubic...769–5.797 Z=4 X-ray Powder Pattern: Onverwacht mine, South Africa (ruthenian). 3.31 (10), 2.87 (10), 1...14.99 Total 99.4 100.0 100.19 (1) Driekop mine, South Africa; by electron microprobe, corresponding to...geversite, erlichmanite, irarsite, Pt–Fe alloys (South Africa); chalcopyrite, cobaltite, gersdorffite, pyrrhotite...economically important platinum-group mineral. In South Africa, in the Merensky Reef, Bushveld complex, Transvaal |  | | Journal (article/letter/editorial) | | V:SE Borneo ($tumpfl 8, Torkian 1973) lII : Driekop Mine, Bushveld (Torkian¢$tumpf11975 I l,]I; $orashigawo...PGE sulfarsenides, hollingworthite, was discovered as a new mineral in the Driekop Mine, Transvaal by Stumpfl...irarsite, from Onverwacht, Transvaal. In the past twenty years members of the hollingworthite-irarsite group...(thipsaper} v .~ .~ ~, 7 "~ ,¢-~ /A ~ ~'. "~ / HOLLINGWORTHITE-~ / ~ ~ v ,, ,, v * v v v ,}RuAsS ...~ IrAsS Fig. 10. Compositional data for hollingworthite, irarsite and platarsite at.%) in the ternary" |  | | Journal (article/letter/editorial) | | hortonolitedunites, and dunite-bronzitites from the Onverwacht,Mooihoek,and Driekoppipesrevealedthe presenceof... mineralsof the pipes. the three dunRe pipes,Onverwacht,Mooihoek,and The unique geologicalpositionof...the Introduction ton Pt were encountered at Onverwacht and annual productionfrom the three pipeswason...pipeswason the order of 15,000 ozs. Driekop was the last mine to ceaseoperationsin 1961. The disappearanceof these...connection"implied magmaticassociation, it also, The pipesof Onverwacht,Mooihoek,and Driekop and even better, fits the |  | | 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...clinopyroxene; 3) tetraferroplatinum, laurite, hollingworthite, unnamed mineral (Rh, Ru)AsS, syngenetic with...tetraferroplatinum (?), sperrylite, geversite, hollingworthite, platarsite, cabriite, rustenburgite, sobolevskite... in den Horthonolit-Duniten der Mooihoek und Onverwacht Pipes, Bushveld-Komplex Minerale der Platingruppe |  | | 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...alloy, chromite (Onverwacht mine, South Africa); osmium, Pt–Pd–Cu alloy, hollingworthite, irarsite, laurite...Distribution: In South Africa, in the Merensky Reef, Bushveld complex, Transvaal, at the Onverwacht [TL] and...Szymański (1977) Platinum group minerals from Onverwacht. III. Genkinite, (Pt, Pd)4 Sb3 , a new mineral |  | Kojonen, K. K., McDonald, A. M., Stanley, C. J., Johanson, B. (2011) Törnroosite, Pd11As2Te2, a new mineral species related to isomertieite from Miessijoki, Finnish Lapland, Finland. The Canadian Mineralogist, 49 (6) 1643-1651 doi:10.3749/canmin.49.6.1643 | Journal (article/letter/editorial) | | contains inclusions of laurite, irarsite, hollingworthite, and cuproiridsite. Fine-grained PGM grains...platiniferous dunite pipes of Driekop, Mooihoek and Onverwacht. In this study, the chemical compositions of...reflect contributions of PGM from the Mooihoek, Onverwacht and Driekop pipes, with abundant Pt–Fe alloys...the PGM, sperrylite and geversite 30 vol.%, hollingworthite–irarsite 15 vol.%, and the remaining 5 vol...and mertieite II from the Onverwacht pipe. From the Mooihoek and Onverwacht pipes, Rudashevsky et al. |  | | Journal (article/letter/editorial) | | University of the Witwatersrand, PO Wits, 2050, South Africa CHRISTOPHER A. LEE¶ 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 5–7 g/t, except for Union mine, where it is currently 8 g/t. The relative proportions |  | | Journal (article/letter/editorial) | | platinum-groupantimony phases,as well as the hollingworthite-irarsite group, decrease rapidly with increasingdistancefrom...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...(Pt, Pd, Ni)S Geversite PtSb• Irarsite IrAs Hollingworthite RhAsS Platinum-groupminerals NativeOsmium...Acknowledgments Prentice,T. K., and Murdoch, R., 1929a, Onverwacht platinum metallurgy:SouthAfrican Mining Eng. |  | | Journal (article/letter/editorial) | | Applied Geology, University of Natal, Durban, South Africa With 4 Figures Received February 2, 1996; accepted...testibiopalladite merenskyite and moncheite hollingworthite, irarsite, platarsite and tolovkite These...erlichmanite-laurite 5. ferronickelplatinum-tulameenite 6. hollingworthite-irarsite 7. malanite-cuproiridsite-cuprorhodsite...solid - solution series between cobaltite and hollingworthite. It is also conceivable that gold, copper and...6 Froodite Gaotaiite Genkinite Geversite Hollingworthite [36.10] 0.14 27.98 0.35 7.00 [20.34] 15 |  | | Report (volume) | | in Magnetic Concentrates from the· Goodnews Bay District, Alaska By SAM ROSENBLUM, R. R. CARLSON, j. M...in magnetic concentrates from the Goodnews Bay district, Alaska. (U.S. Geological Survey Bulletin ; 1660)...southwestern Alaska showing location of Goodnews Bay district 3 Photograph of the Kevex screen showing the results...different groups of samples from the Goodnews Bay district 23 SEM micrograph of the lower left part of figure...preliminary magnetic concentrates from the Goodnews Bay district, Alaska 6 Results of semiquantitative spectrographic |  | | Journal (article/letter/editorial) | | 1975 Platinum Mineralogy of the Driekop Mine, South Africa M. TARKIAN and E. F. STUMPFL* Hamburg, Germany...of concentrates from the Driekop platinum mine, South Africa, has resulted in significant additions to...sperrylite (PtAs2) and geversite (PtSb2), 15% hollingworthite (RhAsS) and irarsite (IrAsS) and 50/o of other...question is irarsite, frequently associated with hollingworthite. PdsCuSba is not a separate mineral species...of the critical zone of the Bushveld Complex. The mine is now dormant: it was in operation until 1961. |  | | Journal (article/letter/editorial) | | platinum able information on the ores from the Union mine platinumdeposits.When onebf us (EFS) pubby Kingston(1966)...oœBrynard et al. (1976), cent sperrylite. At Union mine, laurite and ferroVermaakandI-Iendriks(1976), andGasparriniand..." Driekop*** 6.4 2 50 50.3 2 30 -- Hollingworthite RhAsS Irarsite IrAsS -- 15 -- Kotulskite...sulfarsenides hollingworthite and irarsite. The latter has also beenrecordedfrom the pipe at Onverwacht(Genkin...Lake, New Ramblermine, Hitura) suggests that hollingworthite andirarsitearelate-formed minerals in platinum-group |  | | Journal (article/letter/editorial) | | University] at 17:41 09 June 2016 TaEnaleh, Noril’sk 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...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...collected at the Vermilion mine in what is now the famous Sudbury district, Ontario, Canada. He named |  | | Journal (article/letter/editorial) | | Rh form sulfarsenides (irarsite IrAsS and hollingworthite RhAsS, 22 respectively). The chemical preference...Merensky Reef of the Bushveld 31 Complex, South Africa, PGE alloys form up to 80 % of the total of...with hollingworthite (Fig. 1a). The solid solution 119 between sperrylite and hollingworthite is considered...1a). The Ru+Os content 124 is higher in hollingworthite. Sulfur correlates positively with Rh and Ru...The Rh-bearing system. At 1300 and 1200°C, hollingworthite (RhAsS) is stable in 199 quenched sulfide |  | Yudovskaya, M., Kinnaird, J., Naldrett, A. J., Mokhov, A. V., McDonald, I., Reinke, C. (2011) FACIES VARIATION IN PGE MINERALIZATION IN THE CENTRAL PLATREEF OF THE BUSHVELD COMPLEX, SOUTH AFRICA. The Canadian Mineralogist, 49 (6) 1349-1384 doi:10.3749/canmin.49.6.1349 | Journal (article/letter/editorial) | | THE CENTRAL PLATREEF OF THE BUSHVELD COMPLEX, SOUTH AFRICA Marina YUDOVSKAYA§ School of Geosciences, University...the Witwatersrand, Private Bag 3, Wits 2050, South Africa, and IGEM RAS, Staromonetny 35, Moscow 119017...the Witwatersrand, Private Bag 3, Wits 2050, South Africa Andrey V. MOKHOV IGEM RAS, Staromonetny 35...Johannesburg, PO Box 524, Auckland Park 2006, South Africa Abstract The lateral variation in platinum-group...With decreasing temperature, sperrylite and hollingworthite continued crystallizing across a wide range |  | | Journal (article/letter/editorial) | | 178-184 (1987) © Springer-Verlag 1987 Irarsite-hollingworthite solid-solution series and other associated...irarsite-hollingworthite solid-solution series occur in the Shetland ophiolite complex. Hollingworthite frequently...both Ir and Rh end members of the irarsite-hollingworthite group. The presence of platinum-group elements...values (c) in air X Y Y% Pe% 2d Irarsite and Hollingworthite 0.2984 0.3057 42.6 5.4 478.9 0.3006 0.3078...to the irarsite-hollingworthite series• Irarsite is commonly rimmed by hollingworthite and the converse |
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