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Deep mining methods, conglomerate mine of the Calumet and Hecla Consolidated Copper Co.
| Author: | Vivian, Harry. |
|---|---|
| Year: | 1931 |
| Issuing Agency: | United States Bureau of Mines, |
| Series: | Information circular / U.S. Bureau of Mines ; |
| Report Number: | no. 6526 |
| Subjects: | Mining engineering--Michigan--Upper Peninsula |
| Copper mines and mining--Michigan--Upper Peninsula | |
| Links: | https://hdl.handle.net/2027/mdp.39015071230877 |
| https://hdl.handle.net/2027/mdp.39015077561739 |
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