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high grade gold ore in south africa mining cadastre ottawa

Mar 01, 2007 Details of world gold production over the past 150 years appear in Fig. 1.The details of gold ore grades for hard rock mining for the United States, Australia, South Africa, Brazil and Canada are shown in Fig. 2.The prices of gold in both dollars of the day and 1998 US dollars are also plotted in Fig. 2.The effects of the California gold rush in 1849, followed by the gold rushes in Australia ...

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