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| 留矿柱空场采矿法保留部分矿石作为矿柱，用它支撑采场顶板的一种无支护开采法。这类方法有: 1. 全面回采法〈breast stoping〉 2. 房柱式回采法〈room and pillar method〉。 3. 宽房柱回米法〈pillar and chamber workings〉 | |||
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