metal mining
... 金属含量metal content 金属矿床开采metal mining 金属矿物 metallic mineral ...
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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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