Abstract: A concentrator device for recovering lead, gold or other heavier matter from soil, gravel or another substrates. The concentrator may have an inner cylinder with screens and an outer cylinder with baffles. Various baffle arrangements are disclosed. A variable speed motor may drive rotation of the outer cylinder and a pre-processing hopper may be used to break up input soil. The hopper may include mechanical and/or water based components to separate the recovery object from the substrate it is in. Various screen configurations for the inner cylinder are disclosed, as are related aspects of the present invention.