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witwatersrand gold mines

  • Witwatersrand Gold Fields: Geology, Genesis, and Exploration

    Gold has been produced from seven major gold fields located around the northern and western margin of the 350-km-long Witwatersrand basin. Each gold field consists of The Witwatersrand plateau consists of a 5000-to-7000-metre-thick (3.1–4.3 mi) layer of mainly sedimentary rocks laid down over a period of about 260 million years, starting approximately 2.97 billion years ago. The entire series of rocks, known as the "Witwatersrand Supergroup," consists of very hard erosion resistant quartzites, banded ironstones and some marine lava deposits, interspersed with softer, more easily eroded tillites, mudstones and conglomerates. The oldest rocWitwatersrand - Wikipedia2015年2月2日  Gold in the Witwatersrand is enriched to mineable concentrations in thin quartz pebble beds (‘reefs’) that commonly extend over kilometres.Witwatersrand gold deposits formed by volcanic rain, anoxic rivers

  • Witwatersrand System Gold-bearing, Supergroup, Basin

    The Witwatersrand rocks overlie rocks of the Dominion Reef System, underlie those of the Ventersdorp System, and occur in an east-west band from Randfontein to Springs and Growth of the Early Gold Mining Industry. On 14 September 1886, the first large mining company on the Reef, the Witwatersrand Gold Mining Company, was formed with a Discovery of the Gold in 1884 South African History Online2000年1月1日  The Witwatersrand gold fields of South Africa account for more than a third of the world’s total gold pro- duction since mining started there in 1886: 48,000 t Au. Witwatersrand gold fields: Geology, genesis and exploration

  • Witwatersrand South Africa, Map, History Britannica

    A heavy in-migration of miners followed, and the city of Johannesburg grew near the centre of the Witwatersrand. The tailing dumps of the gold mines stretch the entire length of The annual decline of Witwatersrand production has averaged 20 t of gold per year since 1994; at this rate, Witwatersrand gold mining will end in mid-2022. The forty-year Witwatersrand gold: Discovery matters - G. N. Phillips, 2013

    • “خدمة الرعاية لدينا ، تصنيع سعر القلب الدقيق ، العملاء في سهولة.”

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