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first mining
In the room-and-pillar method, the part of the coal that is won from the rooms, as distinguished from the second part, which is the extraction of the remaining pillars.
- 词性: noun
- 行业/领域: 采矿
- 类别 一般矿业; Mineral mining
- Government Agency: USBM
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创建者
- ed.young
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(Milwaukee, United States)