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A dry washer separates gold from sand by pulsations of air coming up through a porous cloth medium. it is the gold prospecting equipment of choice in desert areas.nbsp the vibrations and flow of air replace the function of water in the normal sluice allowing the gold nuggets to settle downward.nbsp screened gravel passes down an inclined riffle box with cross riffles. the bottom of the box consists of a thin light weave canvas or some other fabric through which moving air easily passes.
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