Harts Mill was probably a mining community named for a stamp mill. In 1878 a richer deposit was found, resulting in the construction of a stamp mill. This was originally produced by mechanical means using a stamp mill to create flakes. Work began on the new stamp mill in 1888. Today, only the large smokestack and the ruins from the stamp mill remain. That year the Farwell Stamp Mill caught fire. In 1933, fire destroyed the stamp mill works and ore was stockpiled. The Neahr Stamp Mill ruin remains clearly visible on the shore. The rock was brought to a stamp mill to be crushed. A 10 Stamp mill was built at this mine. In 1915, a stamp mill was built. Mining equipment at the ranch includes an arrastra and a stamp mill for ore processing. A stamp mill was moved to town from Aurora in 1866. By 1864, a stamp mill was working in the area. In its heyday, the camp had a store and a ten-stamp stamp mill.