Home > Term: blue metal
blue metal
A term used in England for a hard bluish-gray shale or mudstone lying at the base of a coalbed and often containing pyrite.
- ส่วนหนึ่งของคำพูด: noun
- อุตสาหกรรม/ขอบเขต: Mining
- Category: General mining; Mineral mining
- Government Agency: USBM
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- ed.young
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(Milwaukee, United States)
