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

Diamond-drilling blast holes, Eastern Magnetite Mine C

Blast-hole diamond drilling in California mines

Diamond-bit performance in schist

Diamond-bit performance in limestone and dolomite

Diamond-bit performance in sandstone

Diamond-bit performance in cherty limestone and cherty dolomite

Published Year

• 1940-1949 (3)
• 1950-1959 (4)

Subject

• Boring machinery (7) *
• Diamond bits (7) *
• Rock-drills (3)
• Blasting (2)
• Dolomite (2)
• Limestone (2)
• Boring (1)
• Magnetite mines and mining--Equipment and supplies (1)
• Mines and mineral resources--California (1)
• Mines and mineral resources--Pennsylvania--Centre--Equipment and supplies (1)
• Sandstone (1)
• Schists (1)

Author

• Long, Albert E. (4)
• Mosier, McHenry. (2)
• Butner, D. W. (1)
• Gallagher, Michael J., (1)
• Hausen, Donald M. (1)
• Johnson, George H. (1)

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