The crown pillar of stope is permanent loss and not recoverable, while sill pillar and barrier pillar shall be recovered after the ore drawing work is completed.
采场的顶柱作为永久矿柱损失,采场底柱、间柱等采场大量放矿完毕后,一次性进行回收。
The crown pillar of stope is permanent loss and not recoverable, while sill pillar and barrier pillar shall be recovered after the ore drawing work is completed.
采场的顶柱作为永久矿柱损失,采场底柱、间柱等采场大量放矿完毕后,一次性进行回收。
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