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Mining methods and costs at champion copper mine, painesdale, mich
Lode mined is brecciated top of Baltic flow, in amydaloid zone; history; geology; prospecting, development and mining methods; cost data.
Mining methods and costs at champion copper mine, painesdale, mich
Lode mined is brecciated top of Baltic flow, in amydaloid zone; history; geology; prospecting, development and mining methods; cost data.
Mining methods and costs at champion copper mine, painesdale, mich
U. S. Bur. Mines -- Information Cir
Mendelsohn, A. (author)
1931
16 pages
17 Figs. on Supp. plates
Report
English
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