确定合适的煤层开采比，加强设备的完好管理，加强选煤技术管理，合理投入，杜绝此类现象的发生。
Through ascertaining appropriate seam exploitation ratio, strengthening the management of equipments and coal cleaning technology, and investing reasonable, this phenomenon was stopped.
露天开采比地下开采有很多的优越性，但缺点也是非常明显的，那就是在开采矿石的同时，还要剥离大量的岩石。
The open-pit mining has more advantages than underground mining, but its disadvantages is also very obvious, that is, a lot of rocks are also peeled in minerals exploitation.
即使矿源比承租人预测的要少，或者矿源是不可开采的形式，这也是不可退还的。
This is nonrefundable, even if the source of the mineral is less prevalent than the lessee predicted it to be or if it is in an unextractable form.
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