A material processing system for processing and separating material, such as gold or rocks of desired shape and size, from undesired materials. The material processing system generally includes a base, a table rotationally coupled to the base, a drive assembly coupled to the base by a height-adjustment mechanism, and one or more wheels, such as large pneumatic wheels mounted on the drive assembly and positionable so that a portion of the outer surface of the wheels contacts the table. The table may be rotationally coupled to the base by a bearing, and may further be coupled to the bearing by a table support. Material fed onto the table may be crushed beneath the wheels or carried over a plurality of annular grooves as the table rotates, driven by one or more wheels or directly by a motor.