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Diamond drilling blast holes, Balmat Mine, St. Lawrence County, N.Y.

Diamond-drilling blast holes, Bellefonte Mine, National Gypsum Co., Centre County, Pa.

Diamond-drilling blast holes, Eastern Magnetite Mine C

Published Year

• 1940-1949 (3)

Subject

• Blasting (3)
• Boring machinery (3) *
• Rock-drills (3)
• Diamond bits (2)
• Magnetite mines and mining--Equipment and supplies (1)
• Mines and mineral resources--Pennsylvania--Centre--Equipment and supplies (1)
• Zinc mines and mining--New York (State)--Saint Lawrence County--Equipment and supplies (1)

Author

• Mosier, McHenry. (3) *

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