Where is most of the world's unmined gold found? - Quora Primary often, gold is what is found in rock formations. Secondary, it is found in waterways that have run through these rock and mineral formations. The biggest known deposits of gold show up on two continents, they are Africa and India. In these two continents, South Africa is the one which has largest concentrations of gold. The origin of the gold and uranium ores of the Black Reef ... The Black Reef Formation is a laterally extensive sedimentary succession at the base of the Transvaal Supergroup. The quartz-pebble conglomerates host erratic concentrations of gold and uranium; however, in areas that are located spatially above the gold and uranium-bearing reefs of the Witwatersrand Supergroup, the concentrations can reach ore-grade. small stone crushers for gold extraction in south africa Mining is the extraction of valuable minerals or other geological materials from the earth, usually from an orebody, lode, vein, seam, reef or placer deposit.These deposits form a mineralized package that is of economic interest to the miner.    Read More

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    Primary often, gold is what is found in rock formations. Secondary, it is found in waterways that have run through these rock and mineral formations. The biggest known deposits of gold show up on two continents, they are Africa and India. In these two continents, South Africa is the one which has largest concentrations of gold.

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    This is a piece of gold ore from the famous Witwatersrand gold deposits of South Africa. The ore consists of conglomerate pebbles mostly of quartz, in a sandy matrix, with abundant pyrite in the cement. The gold, which occurs in the cement but not in the pebbles, is closely connected with the pyrite and is not visible to the naked eye.

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    South Africa now produces only 6 percent of the world's gold, as recent exploration here has yielded little, while countries such as Brazil and Mongolia have found new deposits.

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