Deep mining methods, conglomerate mine of the Calumet and Hecla Consolidated Copper Co. / by Harry Vivian.
This paper deals principally with the retreating method of mining as applied in the Calumet & Hecla Consolidated Copper [Companies] deep Conglomerate mine, pointing out some of the difficulties encountered in deep mining describing the particular methods used at Calumet to carry on a large-scale...
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| Format: | Government Document Book |
| Language: | English |
| Published: |
[Place of publication not identified] :
United States Bureau of Mines,
1931.
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| Series: | Information circular (United States. Bureau of Mines) ;
6526. |
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