According to the U.S. Bureau of Mines published “MineralCommoditySummaries, 1996” reported that the silver mines of the world total reserves of 280 000 t, the reserve base of 420,000 tons, mainly distributed in the United States (reserves of 31 000 t, the reserve base of 72 000 t), Canada (reserves 37 000 t, the reserve base of 47 000 t), Mexico (reserves of 37 000 t, the reserve base

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