Abstract: A device for separating material of lighter specific gravity from material of a heavier specific gravity. The device is comprised of a generally semi-cylindrical outer tank comprised of end walls and a semi-cylindrical bottom portion, a material introducing system to introduce the material to be separated into the outer tank, a medium introducing system to introduce media into the outer tank under pressure, a baffle system secured within the outer tank containing sides wherein the sides project above the surface of the medium within the tank when the baffle system is secured to the end walls of the semi-cylindrical tank, a paddle drum system comprised of an generally cylindrical inner tank and paddles secured thereto and a drive system secured to the support system of the device wherein the drive system rotates the paddle drum system.