地下矿山 meaning in Chinese

underground mine

Review of application of underground mine informatization
地下矿山信息化应用综述
Rational ore matching ensuring ore removal grade stability
地下矿山残矿的回收技术
Safety regulations for metal and nonmetal underground mines
金属非金属地下矿山安全规程
Study on the stope roof safety classification of underground mines
地下矿山采场顶板安全等级划分方法的探讨
Evaluation and optimization of disposal methods for gob in underground mine
地下矿山采空区处理方法的评价与优选

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