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In Australia four men filling a 'Long Tom, or raised box-sluice, will remove and wash twenty-four cubic yards of ground per day. When the ore is fine, mercury may be dropped into the upper end of the sluice; and it picks up the particles, 'tailing, as it goes, before the two metals have run far down. Both stop at the first riffle or resting-place.
The artificial or portable box-sluice is a series of troughs each about twelve feet long, like the upper compartment of 'Long Tom. They are made of half-inch boards, rough from the saw, the lower end being smaller to fit into its prolongation.
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