A dry washer is a piece of equipment that is used to separate gold from sand with pulsations of air coming up through a porous cloth medium. This allows the gold to settle downward and get caught. It is the gold prospecting equipment of choice in dry desert areas. The vibrations and flow of air replace the function of water in the normal sluice, allowing the gold to settle downward. 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 passes upward.
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