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Gold Deposits - Encyclopedia of Life Support Systems

1. orogenic gold deposits 2. Carlin-type gold deposits 3. epithermal deposits 4. porphyry copper-gold deposits 5. iron oxide copper-gold deposits 6. gold-rich massive sulfide deposits The seventh type—the Witwatersrand pebble-conglomerate type— may be an ancient alluvial placer, but which others include in the orogenic gold type. In highly ...

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Mining seismicity in the Witwatersrand Basin: monitoring ...

Mining seismicity in the Witwatersrand Basin: monitoring, mechanisms and mitigation strategies in perspective K. L. Riemer1, R. J. Durrheim2 1 Gold Fields, Gauteng South Africa 2 University of the Witwatersrand & CSIR Centre for Mining Innovation, Gauteng South Africa Received 21 May 2012; received in revised form 10 June 2012; accepted 15 ...

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The sedimentary setting of Witwatersrand placer mineral ...

Wyatt Ernest Lawrence Minter, 2006. "The sedimentary setting of Witwatersrand placer mineral deposits in an Archean atmosphere", Evolution of Early Earth's Atmosphere, Hydrosphere, and Biosphere - Constraints from Ore Deposits, Stephen E. Kesler, Hiroshi Ohmoto

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Witwatersrand gold deposits (pdf) | Paperity

Although gold overgrowths on pyrite are rarely well crystallized, sufficient particles have been observed to indicate that the cube faces of the gold crystals grow on the cube faces of the pyrite rotated by 45 Genesis of the Witwatersrand Gold Deposits Although at one time the subject of controversy, the fossil placer nature of the ...

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Witwatersrand | mountain ridge, South Africa | Britannica.com

Witwatersrand: Witwatersrand, ridge of gold-bearing rock mostly in Gauteng province, South Africa. Its name means "Ridge of White Waters." The highland, which forms the watershed between the Vaal and Limpopo rivers, is about 62 miles (100 km) long and 23 miles (37 km) wide; its average elevation is …

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Witwatersrand Basin (RSA)

Peak gold production occured in 1970 when over 1000 metric tommes were mined, generating US $1,164 billion in sales, however gold production has declined since 1980. The average recovery grade of the Witwatersrand gold mines has declined from 13,28 grammes/tonne in 1970 to 5,3 grammes/tonne in 1991. 2 Minerals:

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witwatersrand gold mining - shibang-china.com

Gold Mining Witwatersrand,South Africa - Gold Ore Crusher Gold was discovered in the Witwatersrand in 1886, and it soon became evident that the area covered the world's largest and richest gold deposit.

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Gold Deposits | Gold.info

Witwatersrand Gold Deposits. A special type of gold deposit is the Witwatersrand goldmine in South Africa, which is by far the biggest gold field in the world. About 40,000 tonnes of gold have already been extracted from it. The Witwatersrand goldmine is identified as a so-called mixed type of primary and secondary gold deposits.

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The impact of gold mining on the Witwatersrand on the ...

 · William Knight registered the first mining company on the Witwatersrand, the Witwatersrand Gold Mining Company, in September 1886. Goch founded the George Goch Gold Mining Company in 1886 and the Wemmer Gold Mining Company in 1887. Rudd and Rhodes floated the company Gold Fields of South Africa Limited on 9 February 1887.

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Sep 28, 2016 TriStar Gold, Another Wits Lookalike in ...

TriStar Gold, Another Wits Lookalike in Brazil. Bob Moriarty Archives Sep 28, 2016. I've been writing about Novo Resources and their Witwatersrand lookalike deposit for over five years.

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The formation of gold deposits in South Africa

 · In 1852, the English prospector J.H. Davis discovered the first gold in the Witwatersrand, leading to the South African gold rush and the discovery of much more gold deposits within the basin.

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small specks of gold appear. The rocks are chock-full of it. Nearly half the gold ever mined in human history has come from these conglomerates in South Africa's Witwatersrand basin. Small-scale gold prospecting and mining began in this area in the early 1850s, but the first mother lode wasn't discovered until 1885. Two itinerant

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Brief history of gold mining in South Africa - Mining for ...

Gold was discovered in the Witwatersrand which led to an influx of miners from around the world 1886 - 1900 First large gold mining company established and the commencement of the development and the population of Johannesburg increased ten-fold in just four years. A new class, the Randlords, emerged

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Genesis of the Witwatersrand gold-uranium deposits ...

Suggests that the uranium in Precambrian conglomerates of the Witwatersrand, South Africa, is biogenic in origin and was concentrated, together with pyrite, by microorganisms in an anaerobic environment, possibly along a steep coast line in relatively deep waters containing hydrogen sulfide.

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The Witwatersrand deposit and the problem of the ore ...

Evidence for the primary character of spheroids and the autochthonous crystallization of pyrite under endogenic conditions is furnished. The association of gold with carbonaceous rocks is interpreted in terms of the nuclear magnetic physicochemical phenomena. It is concluded that the Witwatersrand deposit is a hydrothermal metasomatic deposit.

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The formation of gold deposits in South Africa: Research ...

 · The Witwatersrand basin in South Africa hosts the largest known gold repository on Earth -- but how was it formed? Scientists were able to figure out how parts of the Earth's largest gold deposits ...

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The formation of gold deposits in South Africa ...

 · In 1852, the English prospector J.H. Davis discovered the first gold in the Witwatersrand, leading to the South African gold rush and the discovery of much more gold deposits within the basin.

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A paper on the origins of the original Witwatersrand Gold ...

 · These lavas were found in many places while gold-mining. Surface occurrences. On the surface, a huge tidal-wave or Tsunami screamed northwards, taking the tops of the volcanic vents, or pipes, with it. This piled up along a roughly East-West line to form the Witwatersrand Ridge, about 120 kilometres from impact.

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Pilbara's gold rush: a complete guide to the main players

 · It is similarities between the current finds of many small, watermelon seed sized gold nuggets and the fabulously rich Witwatersrand gold deposit in South Africa that is driving share prices higher and seeing a rush to peg ground and consolidate tenements in all of the areas around the discoveries of nugget fields.

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Witwatersrand Gold Deposits

The Witwatersrand deposits have produced almost 40% of all the gold produced on earth since beginning of time over 1.5 billion with a B ounces that's the equivalent of 305 million ounce deposits if there's one area of agreement on the Witwatersrand gold deposits is that they are truly world class solid gold elephants.

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Witwatersrand gold deposits formed by volcanic rain ...

The Witwatersrand gold deposit is the largest in the world. Thermodynamic calculations show that such rich accumulations of gold could be linked to abundant volcanism, primitive life and the ...

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Mining seismicity in the Witwatersrand Basin: monitoring ...

Mining seismicity in the Witwatersrand Basin: monitoring, mechanisms and mitigation strategies in perspective K. L. Riemer1, R. J. Durrheim2 1 Gold Fields, Gauteng South Africa 2 University of the Witwatersrand & CSIR Centre for Mining Innovation, Gauteng South Africa Received 21 May 2012; received in revised form 10 June 2012; accepted 15 ...

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Witwatersrand gold deposits (pdf) | Paperity

Although gold overgrowths on pyrite are rarely well crystallized, sufficient particles have been observed to indicate that the cube faces of the gold crystals grow on the cube faces of the pyrite rotated by 45 Genesis of the Witwatersrand Gold Deposits Although at one time the subject of controversy, the fossil placer nature of the ...

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Hydrothermal gold mineralization in the Witwatersrand ...

The origin of the gold mineralization in the Witwaterstrand basin of South Africa—the largest known gold province—has been controversial for decades, with arguments favouring detrital 1,2 ...

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What And Where Is Witwatersrand?

 · Scientists predict that the gold deposits in Witwatersrand formed nearly 3 billion years ago, when elemental gold formed compounds with sulfur that were washed down as acidic rain. The Archean microbes then triggered the precipitation of gold from the acidic waters, leading to the formation of vast deposits of this precious metal.

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Ore Deposits 101 - Part 8 - Witwatersrand Gold Deposits on ...

Part 8 of an 11 part series introducing ore deposit geology to non-technical people. This one covers the Witwatersrand gold deposits, how they were discovered, how they formed and how they are mined.

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small specks of gold appear. The rocks are chock-full of it. Nearly half the gold ever mined in human history has come from these conglomerates in South Africa's Witwatersrand basin. Small-scale gold prospecting and mining began in this area in the early 1850s, but the first mother lode wasn't discovered until 1885. Two itinerant

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Witwatersrand Basin - Howling Pixel

Witwatersrand Basin. The Witwatersrand Basin is a largely underground geological formation which surfaces in the Witwatersrand, South Africa.It holds the world's largest known gold reserves and has produced over 1.5 billion ounces (over 40,000 metric tons), which represents about 50% of all the gold ever mined on earth. The basin straddles the old provinces of Transvaal and the Orange Free ...

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Quartz-Pebble-Conglomerate Gold Deposits

another quartz-pebble-conglomerate gold deposit as rich as the Witwatersrand deposits remains highly unlikely because of the confluence of features necessary to create such a large endowment of gold. However, some smaller occur-rences do exist in the United States. Pyritic paleoplacers of sub-ore grade are found in the Deep Lake Group and

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What And Where Is Witwatersrand?

 · Scientists predict that the gold deposits in Witwatersrand formed nearly 3 billion years ago, when elemental gold formed compounds with sulfur that were washed down as acidic rain. The Archean microbes then triggered the precipitation of gold from the acidic waters, leading to the formation of vast deposits of this precious metal.