A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Method and cost of driving rock creek tunnel, Hecla Mining Co, Shoshone County, Idaho
Tunnel is on south side of Osborn fault and east of Coeur d'Alene Silver Belt; there are no producing mines in this part of district; three shifts of three men each, worked 7 days per week on contract; company provided tools, supplies, and necessary labor on dump; direct cost of driving tunnel was $18.26 per ft; geological formation; equipment at tunnel; cycle of operations.
Method and cost of driving rock creek tunnel, Hecla Mining Co, Shoshone County, Idaho
Tunnel is on south side of Osborn fault and east of Coeur d'Alene Silver Belt; there are no producing mines in this part of district; three shifts of three men each, worked 7 days per week on contract; company provided tools, supplies, and necessary labor on dump; direct cost of driving tunnel was $18.26 per ft; geological formation; equipment at tunnel; cycle of operations.
Method and cost of driving rock creek tunnel, Hecla Mining Co, Shoshone County, Idaho
U S Bur Mines -- Information Cir
Butner, D.W. (author)
1949
5 pages
Supp Plates
Report
English
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