Home > Term: black bat
black bat
A piece of bituminous shale embedded in the rock immediately over the coal measure and liable to fall of its own weight when the coal beneath it has been removed. Compare: kettle bottom
- ส่วนหนึ่งของคำพูด: noun
- อุตสาหกรรม/ขอบเขต: Mining
- Category: General mining; Mineral mining
- Government Agency: USBM
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- ed.young
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(V.I.P) 21084 points - 100% positive feedback
(Milwaukee, United States)
