ホーム > Term: main levels
main levels
The first and leading excavations in mines that are made for the purpose of opening out or winning the material being mined, and that are intended to be the principal roadways of the mine.
- スピーチの一部 noun
- 産業/ドメイン 炭鉱
- カテゴリ 炭鉱全般; Mineral mining
- Government Agency: USBM
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作成者
- ed.young
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(V.I.P) 21084 ポイント - 100% positive feedback
(Milwaukee, United States)
