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Open-pit copper mining methods at New Cornelia Branch, Phelps Dodge Corp., Pima County, Ariz.

Open-pit copper mining and concentrating methods and costs, Silver Bell Unit, American Smelting and Refining Co., Pima County, Ariz.

Published Year

• 1960-1969 (2) *

Subject

• Copper mines and mining--Arizona--Pima County (2) *

Author

• Hardwick, W. R. (2)

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