quick vein
... 生产矿山：production mines 生产矿脉：quick vein 生产矿：operating mine ...
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缓倾斜极薄矿脉的开采存在的共同难题是矿山生产能力低，回采难度大。
The common problems existing in the exploitation of flat-dipping thin ore-bodies are that the production capacity is lower and the recovery is difficult.
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