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Updated: August 9, 2026
Each compartment is provided with a loose metal bottom pierced with holes to admit the dust; the true bottom below it has cross-riffles, and above it are bars or gratings to catch the coarser stones. These sluices are mounted on trestles, and the latter are disposed upon a slope determined by the quantity of water: the average fall or grade may be 1 to 50.
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