홈 > Term: geographical concentration
geographical concentration
The ratio of face length (X) to length of main haulage roads (L) in the same units; i.e., X/L.
- 품사: noun
- 분야/도메인: 광업
- 카테고리: 일반 광산; Mineral mining
- Government Agency: USBM
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- ed.young
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(Milwaukee, United States)
