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Updated: May 15, 2025
Sometimes the matter from the under-current box is led back to the main sluice. Rock-Sluices. Large sluices are frequently paved with stone, which makes a more durable false bottom than wood, and catches fine gold better than riffle-bars. The stone bottoms have another advantage that it is not so easy for thieves to come and clean up at night, as is often done in riffle-bar sluices.
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