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4 results returnedGold mining and milling in the Black Canyon area, Yavapai County, Ariz.
Placer operations of Humphreys Gold Corporation, Clear Creek, Colo.
Mining and milling methods and costs at the Summitville Consolidated Mines, Inc., Summitville, Colo.
Mining and milling methods and costs in the Alma district, Colorado
Published Year
Subject
- Gold mines and mining--Arizona--Yavapai County (1)
- Gold mines and mining--Colorado (1)
- Gold--Milling (1)
- Hydraulic mining (1)
- Mines and mineral resources--Colorado (1)
- Mines and mineral resources--Colorado--Alma (1)
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