Abstract: An apparatus for separating gold and silver from a mixture of sand and rock comprises an endless conveyor supported on an inclined plane on a base. A motor connected to a source of electrical power is connected to a driven roller which operates the conveyor, liquid conducting pipes are placed adjacent the endless conveyor for discharging liquid onto the conveyor belt as it rotates upwardly, means for supplying liquid under pressure to the liquid conducting pipes is provided together with means for depositing a mixture of sand and rock onto the conveyor belt. The mixture of sand and rock is washed by streams from the pipes thus separating lighter materials from heavier particles, the former of which flow down the conveyor belt with the liquid into a trough and the latter heavier particles of gold and silver continue to adhere to the conveyor belt and are dislodged by liquid dripping on to the conveyor belt as it turns over the driven roller.

Abstract: A gold concentrator comprises a housing at the end of a sluice into which a quantity of sand, rock and gold particles is deposited. A screen on a portion of the sluice serves to segregate larger particles of rock and gold from the finer sand particles. A hose is attached to the rear wall of the housing and water under pressure mixes with the finer sand. The mixture of sand and water strikes a wall and a depending flange within the housing causing the mixture to turn over therein thus creating a suspension of particles within the liquid. The suspension falls onto the sluice and flows downwardly therealong and over the screen at the bottom thereof. A flange at the end of the sluice turns the suspension in the opposite direction where it flows down a forwardly extending second sluice. The forwardly extending second sluice has a rubber mat thereon having a series of transversely extending grooves which function to trap the gold and black sand particles therein.