Search U.S. government technical reports digitized or harvested by TRAIL.
Shaft sinking at the Sevier Valley Coal Co. mine
Shaft-sinking methods, practices, and costs of the Consolidation Coal Co. at its no. 261 mine, Caretta, McDowell County, W. Va.
Shaft-sinking methods and costs, and cost of plant and equipment at the Macassa Mine, Kirkland Lake, Ontario
Shaft-sinking methods and costs and cost of plant and equipment at the Fad shaft, Eureka Corp., Ltd., Eureka, Nev.
Methods and costs of sinking a shaft through a fractured, water-bearing formation at Friedensville, Pa.
Methods and costs of deepening the Crescent shaft, Bunker Hill & Sullivan Mining and Concentrating Company, Kellogg, Shoshone County, Idaho
Sinking methods and costs for a small vertical shaft with steel supports :Keystone mine, Crested Butte, Colorado