The clean-up barrel is used to treat battery sands when cleaning up the mill. All of the cleanings are placed in the clean-up barrel with mercury and cast iron balls. As the barrel is rotated the material is thoroughly worked and the amalgam is taken up by the mercury and separated from the waste material. The clean-up barrel consists of an iron barrel supported by journals resting in bearings on a wood frame. One journal carries a loose and tight pulley, which rotate the barrel. Our kit consists of 9 white metal castings and wood for the framing and sluice box. The body of the clean-up barrel has 86 nuts and bolts on its castings.