国外主要矿业国家对地下金属矿山连续出矿运矿设备进行了深入的研究。
Research on continuous ore drawing and haulage equipment for underground metal mines has widely been done in main foreign countries with mining industry.
深部水平矿柱开采的稳定性问题，是地下金属矿山迫切需要解决的共性技术难题之一。
The stability of horizontal pillars in deep mining is one of the common technical challenges that should be solved urgently for underground metal mines.
金属矿山地下开采扩建合理生产规模的确定，是矿区开发过程中的一个重要决策因素。
The production scale of the underground metal mine is one of the decisive factors to be considered when the mine is enlarged.
崩落采矿法是金属矿山地下开采应用较多的一种高效采矿方法，覆岩下底部放矿损失贫化大是该采矿法的一个特点。
Caving method is a high efficiency mining method widely used in underground metal mines. While it is a characteristic of the method that the loss rate and dilution rate is high.
金属矿地下开采过程中，采场顶板稳定是矿山正常、高效回采的前提。
During the process of underground mining, the stabilization of stope roof is the basement of normal and productive mining.
金属矿床地下开采形成的大量采空区不仅危及矿山的安全，而且对资源的充分回收造成严重的困难。
Large Numbers of cavities formed by the underground mining of metal mineral resources not only endanger the mine safety but cause great difficulties in a full recovery of the resource.
金属矿床地下开采形成的大量采空区不仅危及矿山的安全，而且对资源的充分回收造成严重的困难。
Large Numbers of cavities formed by the underground mining of metal mineral resources not only endanger the mine safety but cause great difficulties in a full recovery of the resource.
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