The article analyzes how the hanging arch is caused during non-pillar sublevel caving in Jingtieshan mine, in order to provide a reference for rational mining organization and resources utilization.
本文着重分析了镜铁山矿无底柱崩落法悬顶问题，为合理安排矿山生产，合理利用矿产资源，提供了参考依据。
Enter the boiler room and pick up the CROWBAR hanging on the left arch pillar.
进入锅炉房，拿起铁撬左侧拱支柱悬挂。
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