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4 results returnedDiamond-drilling blast holes, Bellefonte Mine, National Gypsum Co., Centre County, Pa.
Diamond-drilling blast holes, Eastern Magnetite Mine C
Published Year
Subject
- Diamond bits (4) *
- Rock-drills (4) *
- Boring machinery (3)
- Blasting (2)
- Bits (Drilling and boring) (1)
- Boring (1)
- Magnetite mines and mining--Equipment and supplies (1)
- Mines and mineral resources--Pennsylvania--Centre--Equipment and supplies (1)
- Sandstone (1)
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