FIELD: gold mining industry, particularly, equipment for mineral concentration by gravity method. SUBSTANCE: device has sluice box with parallel sides and bottom in which sections of riffles inclined relative to bottom are installed in direction of pulp flow. Riffles are located between sides to form fanshaped zones. Middle zone is made in form of full fan with opening angle of 80-90 deg, and extreme zones are made in form of counter semifans. Riffle ends are secured in sides at different angles of inclination to bottom. Ratio of distances between riffle ends on the side of wide and narrow parts of fan is 1.33-1.62. EFFECT: optimized process of materials separation on sluice boxes. 3 dwg
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