 The gold mines of Ouro Preto and Mariana produced 700 tons of gold in the 18th C., half of the world's production at that time
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 Abandoned Gold Mines
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 Fort Bourke Hill Lookout, Peak Gold Mines, Cobar
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 Piece of ore cart rail and spike from gold mines of N. Calif. gold mines. Placer Mining scene on one side...
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 Thorn Trees and in the Background, Huge Slag Heaps From Gold Mines Now Closed
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