Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Mining methods at the eighty-five mines, calumet and Arizona mining Co., Valedon, N. Mex
Mine 3 mi. southwest of Lordsburg; production 7000 to 8000 tons per month silicious copper-gold-silver ore; 200 men employed underground, 40 on surface; mining by shrinkage and cut-and-fill method; igneous rocks, cut by later intrusive; mining methods, practices, and costs. (see also Min. Congress Jl., vol. 17, no. 5, May 1931, pp. 264-275, 17 figs.)
Mining methods at the eighty-five mines, calumet and Arizona mining Co., Valedon, N. Mex
Mine 3 mi. southwest of Lordsburg; production 7000 to 8000 tons per month silicious copper-gold-silver ore; 200 men employed underground, 40 on surface; mining by shrinkage and cut-and-fill method; igneous rocks, cut by later intrusive; mining methods, practices, and costs. (see also Min. Congress Jl., vol. 17, no. 5, May 1931, pp. 264-275, 17 figs.)
Mining methods at the eighty-five mines, calumet and Arizona mining Co., Valedon, N. Mex
U. S. Bur. Mines -- Information Cir
Youtz, R.B. (Autor:in)
1931
26 pages
18 Figs. on Supp. plates
Report
Englisch
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