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Shaft sinking with a shot drill, Idaho Maryland Mine, Grass Valley, Calif.

A method for surveying drill holes by oriented drill rods

Published Year

• 1930-1939 (1)
• 1940-1949 (1)

Subject

• Drill pipe (2) *
• Boring (1)
• Percussion drilling (1)
• Prospecting (1)

Author

• Cohen, C. J. (1)
• Dahners, L. A. (1)
• Jackson, C. F. (1)
• Newsom, J. B. (1)

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