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From Hand Sluice to Dredge

“This here is a sluice,” David said as he held up a long shiny metal object. He explained how, when set in the water properly, heavy objects like gold and lead would be trapped behind the riffles, and the lighter material...

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Excerpted from the U.S. Geological Survey's 1998 Annual Review by Earle B. Amey, Gold Commodity Specialist.

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