Browse TRAIL Inventories

Placer mining in the western United States :part 1. general information, hand-shoveling, and ground-sluicing

Placer mining in the western United States :part II. Hydraulicking, treatment of placer concentrates, and marketing of gold

Placer mining in the western United States :part III. Dredging and other forms of mechanical handling of gravel, and drift mining

Placer-mining methods of E.T. Fisher Co., Atlantic City, Wyo.

Placer operations of Humphreys Gold Corporation, Clear Creek, Colo.

Mining and transporting coal underground by hydraulic methods :a literature survey


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