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Placer mining in the western United States :part 1. general information, hand-shoveling, and ground-sluicing

Placer mining in the western United States :part II. Hydraulicking, treatment of placer concentrates, and marketing of gold

Placer mining in the western United States :part III. Dredging and other forms of mechanical handling of gravel, and drift mining

Copper Mining in North America

Published Year

• 1930-1939 (4) *

Subject

• Hydraulic mining (3)
• Gold mines and mining--United States (2)
• Dredging (1)

Author

• Gardner, E. D. (4)
• Johnson, C. H. (4) *

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