La Follette, Robert M. (Robert Marion), 1855-1925, ed, La Follette, Robert M. (Robert Marion), 1855-1925, Handy, William M, Higgins, Charles · Chicago : Making of America · leaf 300
WORLDS PRODUCTION OF LEAD … :■^\ CV WORLDS SUPPLY OF COPPER 255 At the present time the productive mines are located inthe conglomerate or in the diabase, the ore averaging fromsix tenths to four per cent copper. The Calumet andHecla is the richest and largest of all the mines m this region.This district has been an active…
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