 | | Journal (article/letter/editorial) | | Concentration of Gold in the Early Precambrian of Southern-Africa R. P. VILJO~N*, R. SAAGER** and M. J. VILJOEN*...Geology, University of Witwatersrand, Johannesburg, South Afrika ** Vancouver, Canada The important gold...gold deposits of the early Precambrian of Southern Africa are confined to two main geologic environments...Introduction a striking and unique pattern Southern Africa is one of the largest gold provinces known on earth...of the granite-greenstone material. In Southern Africa these younger metamorphic mobile belts surround |  | | Journal (article/letter/editorial) | | 1University of the Witwatersrand, Johannesburg, South Africa 2 CREGU, Vandoeuvre-L~s-Nancy, France With 9...was deposited between 3074Ma and 2714Ma in the south-central portion of the Kaapvaal Craton. The depositional...isotopic data for rounded pyrite, sphalerite and osmiridium grains suggest ages that are interpreted to be...PRETORIA WEST ~AND WEST WITS LINE GOLDFIELD CARLETONVlLLE GOLDFIELD /'F-jmKRUGBRSDORP . ~'/,-~ , // JOHANNESBI...~ : L E R K S D O R P , *~ C~ /'~AND GOLDFIELD GOLDFIELD ." ~ .." v/EREENIGING~e HEIDELBERG |  | | Journal (article/letter/editorial) | | University of Cape Town, Rondebosch, Cape Town 7701, South Africa e-mail: hartwig.frimmel@uni-wuerzburg.de Q....mineralization was indeed synsedimentary. Limited local remobilization of gold and other ore constituents...are most likely due to osmiridium inclusions within the gold. Detrital osmiridium grains are rare but a...compared with average continental crust, average South African peridotite xenolith and Allende meteorite...most likely an artefact of contamination with osmiridium inclusions, whereas the lower end of the range |  | Robb, L. J., Charlesworth, E. G., Drennan, G. R., Gibson, R. L., Tongu, E. L. (1997) Tectono‐metamorphic setting and paragenetic sequence of Au‐U mineralisation in the Archaean Witwatersrand Basin, South Africa. Australian Journal of Earth Sciences, 44 (3) 353-371 doi:10.1080/08120099708728317 | Journal (article/letter/editorial) | | mineralisation in the Archaean Witwatersrand Basin, South Africa a a a a L. J. Robb , E. G. Charlesworth...Witwatersrand, Private Bag 3, Wits 2050, Republic of South Africa Version of record first published: 09 May 2007...mineralisation in the Archaean Witwatersrand Basin, South Africa, Australian Journal of Earth Sciences: An International...mineralisation in the Archaean Witwatersrand Basin, South Africa L. J. ROBB, E. G. CHARLESWORTH, G. R. DRENNAN...Witwatersrand, Private Bag 3, Wits 2050, Republic of South Africa. The Witwatersrand Basin is a structural remnant |  | | Journal (article/letter/editorial) | | µm Figure 1. Pt3Fe (darker gray) inclusions in osmiridium grain (lighter gray). The black square consuming... Figure 1. Pt Fe (darker gray) inclusions in osmiridium grain (lighter gray). The black square consuming...92362). The PGA grain is mostly Os-Ir alloy (osmiridium) with small Pt3Fe (isoferroplatinum) inclusions...analysis inside the APT device, an annular electrode (local electrode) is positioned near the needle and the...strength and local potential for different crystal faces. These differences result in local electrical |  | | Report (issue) | | courtesy of D. K. Hallbauer, Chamber of Mines of South Africa ; radioluxograph by David M. Watson, Geological...Grandstaff. Discussion. South Africa: D. Uraniferous quartz-pebble conglomerates in South Africa, by J. W. von...model on the Kaap-Vaal craton, Witwatersrand, South Africa, by W. E. L. Minter. Discussion. F. The Dominion...Dominion Reef Group, Western Transvaal, South Africa, by J. W. von Backstrom. G. The crossbedded nature...Proterozoic Vaal Reef placer deposit, Witwatersrand, South Africa, by W. E. L. Minter. Discussion. I. Examples |  | | 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; |  | | Journal (article/letter/editorial) | | have discredited terms like “iridosmine” and “osmiridium”. Therefore in the succeeding paragraphs those...banded iron formation (BIF) of the Itabira mining district, Brazil, by Olivo et al. (1995) who The “Donauplatin”..."Variegated Metamorphics" of the Bodenmais ore district (F.R. of Germany). Ore Geol Rev 5:151–173 Dill...Lode and placer gold composition in the Klondike district Yukon Territory, Canada, implications for the...and Pt-Fe alloys from the Evander Goldfield, Witwatersrand Basin, South Africa: detrital origin inferred |  | | Journal (article/letter/editorial) | | diamonds; (7) the oldest Os model ages from detrital osmiridium grains, Witwatersrand Basin; (8) re-depletion...appear different in different places. In southern Africa and the Pilbara, there appears to be a shift from...structures, as in the East Pilbara and southern Africa, are more likely to have within-plate magmatic...increase with crustal thickness in Central and South America, and the increase in Rb/Sr appears to be...S. 2012. Azimuthal anisotropy beneath southern Africa from very broad-band surfacewave dispersion measurements |  | | Book | | recognition criteria of uranium mineralizations on a local (individual deposit) and regional scale (uranium...individual deposits or districts. (in brackets country, district, deposit reviewed): Adamek P. (Scandinavia), Adams...(general), Bernik J. (Yugoslavia), Brynard S.A. (South Africa, Namibia), Chenoweth W. (Colorado Plateau, USA)...Saucier A.E. (Grants Region, N.M., USA), Smith RB. (South Texas, USA), Tan H.B. (Canada), Thamm J. (Colorado...Intragranitic Vein Uranium Deposits: Limousin/La Crouzille District, France. . . . . . . . . . . . . . . . . . . |  | | Book | | Contact Reef and the Black Reef / 404 Geol. Soc. South Africa Trans. 58:218-222 (1955) 14-6 PRETORIUS, D....from Precambrian Rocks of the Witwatersrand, South Africa / 439 Precambrian Res. 1:199-212 (1974) Other...Pretorius, University of the Witwatersrand, South Africa; and N. A. Shilo, N. V. Petrovskaya, I. S. Rozhkov...influenced the exploration and settlement of most. In Africa, Europe, and Asia ancient gold mines are known...it would appear that the aborigines of North and South America placed little emphasis on gold beyond its |  | | Book | | t a t e d Bibliographies of Mineral Deposits in Africa, Asia (exclusive of t h e U S S R ) a n d Australasia...him. I have tried to include all ore districts in Africa, Asia (exclusive of the U.S.S.R.)> and Australasia...incluir todos los distritos mineros conocido en Africa, Asia (con exclusion de la Union Soviética), y...Greenland. This volume covers mineral deposits in Africa, Asia exclusive of the U.S.S.R., and Australasia...Philippines, and Japan are included with Asia. In South Africa, the deposits are arranged by prov inces, in |  | | Report (issue) | | famous Mesoarchean Witwatersrand Supergroup in South Africa that contains Earth’s largest gold-uranium deposits...glacier-associated sediments of the Neoproterozoic of south China: Oceanic anoxia or sulfate limitation? .....seepage mound favored—depending on solutes and local pH—development of siderite, ferrous hydroxide, and/or...4-billion-year-old biogenic pyrites from Barberton, South Africa: Sulfur isotope evidence: Science, v. 262, p...sediments from the Barberton Greenstone Belt, South Africa: Precambrian Research, v. 106, p. 93–116, doi: |  | | Book | | metallogeny, on relationships between regional and local ore-bearing structures of various ages, on marginal...and subdivided them into periods of global and local activisation. In particular, the most important...relationships between the evolution of regional and local ore-bearing structures in the Precambrian and Phanerozoic...activisation and continental rifting to the third group. Local structures of ore fields and ore deposits proper...of the continental crust. The classification of local ore-bearing structures consists of seven series: |  | | Book | | Mineralization 4.10. A Comprehensive Example: The Cree de District, Colorado, USA 4.11. Summary 4.12. Recommended...Eastern Goldfields, Western. Australia Barberton, South Africa Eastern Goldfields, Western Australia Manitoba... Large layered complexes Bushveld Complex, South Africa Stillwater Complex, USA Great Dyke, Zimbabwe...Skaergaard, Greenland 4. Kimberlites Kimberly, South Africa B, Intrusions in cratonic areas Diamond C...Bushveld, South Africa Great Dyke, Zimbabwe Sudbury, canada Bushveld, South Africa Bushveld, South Africa |  | | Book | | making a profit. Initially incorporated in the District of Columbia, the Publishing Company was reincorporated...of the Proterozoic, beginning 3,000 m.y. ago in Africa and 2,500 m.y. ago elsewhere. These basins received...iron ores were concentrated (without silica) in local oxidizing sinks on the con¬ tinents. Uranium responded...Precambrian se¬ quences of rocks were deduced for local areas, but correlations between them, except in... . The main period of ore deposition within a district seems to represent a relatively short time span |
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