FIELD: placer opencast mining. SUBSTANCE: line for integrated mechanization of placer opencast mining includes mining, transportation and concentration complexes. Dredge pump comprises mining complex and together with pulp feed-line is included into transportation complex. Concentration complex includes screen, sluice box and stacker. Installed at pulp feed-line is damper of pulp velocity. It has inclined bars. Angle of inclination of generating line of pulp velocity damper to axis is above 20 deg. Pulp velocity damper is made in form of funnel. Funnel space above its axis is covered with lateral horizontal beams successively welded to funnel wall over the entire length of damper. Coarse fraction is separated by bars into dump. Fine fraction is separated by screen and supplied to sluice box for concentration. Intermediate fraction is piled by stacker to dump. EFFECT: higher efficiency. 3 cl, 1 dwg
