Search U.S. government technical reports digitized or harvested by TRAIL.
Mining methods and costs of the Quartz Hill Mining Co., Dewey, Mont.
Gold lode mining in the Tobacco root mountains, Madison county, Mont.
Gold mining and milling in Idaho County, Idaho
Gold mining and milling in northeastern Oregon
Mining and milling methods and costs of the Golden Anchor Mining Co., Burgdorf, Idaho
Reconnaissance of placer mining districts in Idaho County, Idaho
Reconnaissance of placer-mining districts in Lemhi County, Idaho