By Sarah Zhang

Nearly half the gold ever mined comes from the Witwatersrand Basin, a layer of gold-flecked rock that spreads out under South Africa. The mines there are …

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Source:: http://feeds.gawker.com/~r/gizmodo/full/~3/pSh6MWvW3Ho/ancient-microbes-may-have-created-the-worlds-largest-go-1683594801