A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Deep mining methods, conglomerate mine of Calumet and Hecla Consolidated Copper Co.
Retreating method of mining; difficulties encountered; particular methods used at Calumet to carry on large-scale operation at great depth with minimum hazard factor.
Deep mining methods, conglomerate mine of Calumet and Hecla Consolidated Copper Co.
Retreating method of mining; difficulties encountered; particular methods used at Calumet to carry on large-scale operation at great depth with minimum hazard factor.
Deep mining methods, conglomerate mine of Calumet and Hecla Consolidated Copper Co.
U. S. Bur. Mines -- Information Cir
Vivian, H. (author)
1931
20 pages
18 Figs. on Supp. plates
Report
English
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