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Shale (the Shale) is a sedimentary rock composition is complex, but have a thin page-like or sheet laminated joints, mainly by the deposition of clay formed by the pressure and temperature of rock, but mixed with the debris of quartz, feldspar and other chemicals, according to the composition of mixed materials, can be divided into: calcareous shale, iron shale, siliceous shale, carbonaceous shale

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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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