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Mine at Houghton, Mich, first opened in 1855; native copper in amygdaloid formation of Keweenawan age; early developments; resumption in 1937, after 5 yr shutdown; details of conditions and rehabilitation work on mine and mill; dewatering; retimbering; reconditioning incline shafts.
Mine at Houghton, Mich, first opened in 1855; native copper in amygdaloid formation of Keweenawan age; early developments; resumption in 1937, after 5 yr shutdown; details of conditions and rehabilitation work on mine and mill; dewatering; retimbering; reconditioning incline shafts.
Reopening and rehabilitating Isle Royale copper mine
Min Congress J
Eaton, L. (author)
1938
5 pages
Article (Journal)
English
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