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Shaft sinking at the Morton Salt Co. mine at Grand Saline, Texas

Shaft sinking by stripping churn-drill holes

Shaft sinking by rotary drilling

Sinking large-diameter drill holes, Lake Superior district underground iron mines

Methods and costs of sinking a 2-1/2-compartment shaft at the Hope Mine, Clark Fork, Idaho

Methods and costs of sinking the Silver Summit shaft, Wallace, Idaho, using a mechanical mucking machine

Methods and costs of sinking a shaft through a fractured, water-bearing formation at Friedensville, Pa.

Use of prestressed precast shaft supports, Banner Mine, Lordsburg, N. Mex.

Methods and costs of deepening the Crescent shaft, Bunker Hill & Sullivan Mining and Concentrating Company, Kellogg, Shoshone County, Idaho

Methods and costs of sinking a circular concrete-lined ventilation shaft

Methods and costs of shaft sinking in the Coeur d'Alene District, Shoshone County, Idaho

Sinking methods and costs for a small vertical shaft with steel supports :Keystone mine, Crested Butte, Colorado

Safety practices in shaft sinking and tunneling :West Delaware aqueduct

Methods and costs of shaft sinking, U.S. Atomic Energy Commission Project Gnome, near Carlsbad, New Mexico

Mining method, technique, and cost of presplitting the flood control gate shaft, Littleville Dam, Huntington, Mass.


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