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The StampsPosted by Steve Rice (Olympia, United States) on 20 July 2011 in Business & Industry and Portfolio. This was a two stamp mill. The gravel-sized crushed ore would be mixed with water and mercury and pounded into a wet sand consistency. This mixture would be washed down the sluice, in front of the stamps, over mercury coated plates that would trap the gold. This mercury paste would then be retorted to retrieve the gold. This mill is a much heavier duty version of this one. Joshua Tree National Park
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