홈 > Term: unproductive development
unproductive development
The drifts, tunnels, and crosscuts driven in stone, preparatory to opening out production faces in a coal seam or orebody. Horizon mining is characterized by a heavy outlay on the initial unproductive development.
- 품사: noun
- 분야/도메인: 광업
- 카테고리: 일반 광산; Mineral mining
- Government Agency: USBM
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- ed.young
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