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.
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