Cut-off grade method has been used to control the ore drawing in non-pillar sublevel caving mining both in and outside China.
采用无底柱分段崩落采矿法，国内外一直采用截止品位放矿法来控制出矿。
Sublevel caving without bottom pillar is the method of mining used at Huashugou Mine, Jiuchun Iron and Steel Co.
酒泉钢铁公司桦树沟铁矿所用采矿方法是无底柱分段崩落采矿方法。
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。
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