Search U.S. government technical reports digitized or harvested by TRAIL.
Gold mining and milling methods and costs at the Vallecito Western Drift mine, Angels Camp, Calif.
Milling methods and costs at the concentrator of the St. Joseph Lead Co., Atlanta, Idaho
Gold mining and milling in the Black Canyon area, Yavapai County, Ariz.
Mining and milling methods at the Pilgrim mine, Chloride, Ariz.
Gold mining and milling in Idaho County, Idaho