In the course of mining, there are many mines with combined underground and open pit.
在各类矿产资源的开采过程中，有许多矿区属于地下与露天复合开采情况。
The combined oPen pit and underground mining system has found wide application in depeit mining.
矿床开采中露天与地下的联合开采法得到了广泛的应用。
Mining transport system is one of the most important production links in open-pit mining process.
矿山运输系统是露天矿开采工艺中非常重要的生产环节。
Mining transport system is one of the most important production links in open-pit mining process.
矿山运输系统是露天矿开采工艺中非常重要的生产环节。
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