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Diamond drilling blast holes, Bell Mine, the Warner Co., Centre County, Pa.

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

Diamond-drilling blast holes, Eastern Magnetite Mine C

Blast-hole drilling with diamond drills at the Tennessee Copper Co. mines, Ducktown, Tenn.

Blast-hole diamond drilling in California mines

Published Year

• 1940-1949 (5) *

Subject

• Diamond bits (5) *
• Boring machinery (3)
• Blasting (2)
• Rock-drills (2)
• Boring (1)
• Copper mines and mining--Tennessee (1)
• Magnetite mines and mining--Equipment and supplies (1)
• Mineral industries--Pennsylvania (1)
• Mines and mineral resources--California (1)
• Mines and mineral resources--Pennsylvania--Centre--Equipment and supplies (1)

Author

• Mosier, McHenry. (3)
• Beck, William A. (1)
• Butner, D. W. (1)

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