FIELD: concentration of minerals, mainly gold-bearing rock. SUBSTANCE: flow of pulp is formed on screen made integral with sluice box by means of jet of water directed opposite motion of mining mass. Cascade of two screens and sluice box which are rigidly interconnected and are mounted in inclined position is connected with circular or orbital motion drive. Restoring and entrapping coat on sluice box mat is made with positively twisting flows of pulp; heavy separated particles are held by inertial forces against motion of sluice box and flow of pulp is deflected by circular motion of sluice box in its plane. Circular motion drive is provided with device for change of frequency and amplitude of circular motion. EFFECT: enhanced efficiency of concentration due to effective entrapping of finely-dispersed minerals. 3 cl, 4 dwg
