对于金属矿的开采，一般认为分层崩落法与其他采矿法相比，是一种成本高、产量低、木材消耗量大的采矿方法。

Generally top slicing is a mining method of high cost, low productivity, and large consumption of timber as compared with other methods for mining metalliferous ore bodies.

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开采上述金属矿的生产商每天所面对的危机与中非矿业类似，为了等待价格回升，它们也得封存遍布全球的矿产以节省现金支出。

Miners of these metals daily face crises similar to Camec's and mothballing mines around the world to save cash as they wait for a price recovery.

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涞源县矿产已查明的有金属、非金属矿43种，矿点160个，具有一定开采价值。

Laiyuan County minerals have been identified are metals, non-metallic minerals 43, 160 occurrence, the exploitation of a certain value.

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