FIELD: mineral concentration; separation by density. SUBSTANCE: sluice box has box with parallel walls and catching surface. Box bottom is made in form of sinusoid. Center line of the box longitudinal section is in form of hyperbola with maximum height in point of sluice box charging. Sluice box is additionally provided with chain conveyer whose lower run is located on the catching surface and upper run is located on the lower surface. EFFECT: higher efficiency. 2 dwg
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