FIELD: concentration of minerals; difficultly concentrated fine-grained and coarse-grained auriferous sands and ores. SUBSTANCE: lock includes two rows of rectangular chutes mounted one below other and helical surface passing from upper chute to lower one. Helical surface is provided with additional chute over perimeter of outer portion; this additional chute is provided with baffle plates and radius limiters reducing in height; over inner portion, it is provided with detachable accumulator, radius cutoff devices and adjustable stops. EFFECT: enhanced efficiency of concentration of difficultly washable sands and ores containing fine and plate gold. 5 dwg
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