deep open pit mine 凹陷露天矿
deep open-pit coal mine 深大型露天煤矿
deep sunken open pit mine 深凹露天矿
deep concave open pit mine 深凹露天矿
deep pit open mine 深凹露天矿
open-pit mine deep hole 露天矿深孔
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Before and after ending of deep open-pit coal mine, geological disasters such as slope sliding and surface deformation probably occur.
分析研究深大型露天煤矿闭坑前后可能发生滑坡、地表变形等地质灾害。
It will be a short time for Nanfen open-pit iron mine to mine in the third stage. The mine should be engaged on deep part mining design at once.
南芬铁矿目前正在进行的三期境界开采的服务年限已经不长了，矿山需要马上着手进行下期深部开采设计。
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