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Methods and costs of shaft sinking in Coeur D'Alene district, Shoshone county, Idaho
Projects include 2 new shafts collared underground, 1 new shaft collared on surface, and deepening of 10 existing shafts; shaft projects ranged in size from two to four compartments and from 160 to 2083 ft in depth; both hand and machine shoveled shafts were represented; sinking costs ranged from $135.86 to $228. 84/linear ft.
Methods and costs of shaft sinking in Coeur D'Alene district, Shoshone county, Idaho
Projects include 2 new shafts collared underground, 1 new shaft collared on surface, and deepening of 10 existing shafts; shaft projects ranged in size from two to four compartments and from 160 to 2083 ft in depth; both hand and machine shoveled shafts were represented; sinking costs ranged from $135.86 to $228. 84/linear ft.
Methods and costs of shaft sinking in Coeur D'Alene district, Shoshone county, Idaho
US Bur Mines -- Information Cir
McWilliams, J.R. (author) / Erickson, E.G. (author)
1960
49 pages
Report
English
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