Mining methods at Campbell mine of Calumet and Arizona Mining Company, Warren, Ariz., inclined cut-and-fill and semishrinkage.
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| Format: | Government Document eBook |
| Language: | English |
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Washington, D.C. :
[publisher not identified],
1930.
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| Series: | Mines Bur. Info. Circ. No. 6289
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| Online Access: | Connect to the full text of this electronic document |
| Item Description: | [On copper mine, with data on costs] Record is based on bibliographic data in ProQuest U.S. Executive Branch Documents, 1910-1932. Reuse except for individual research requires license from ProQuest, LLC. Electronic resource. |
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| Physical Description: | 1 online resource (18 pages) |
| Format: | System requirements: PDF reader software. |