Water wheel and water powered arrastra on Silver Creek near Pierce, Idaho. Arrastras were used to crush ore to liberate metals from the waste rock. Photo circa 1892.
Ball mill at the Bradley Mine mill at Stibnite in Valley County, Idaho circa 1940. This photo gives a close up view of the ball mills which are used to crush ore. The opening and trough where crushed ore exits the mill is clearly shown in the...