Home > Term: bell holes
bell holes
A conical cavity in a coal mine roof caused by the falling of a large concretion; or, as of a bell mold.
- Sõnaliik: noun
- Valdkond/domeen: Mining
- Category: General mining; Mineral mining
- Government Agency: USBM
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Looja
- ed.young
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(V.I.P) 21084 points - 100% positive feedback
(Milwaukee, United States)
