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| rock salt mining Rock salt mining is an underground mining process in which the salt is physically dug out of the ground in an operation involving drilling, blasting and crushing the rock. The major percentage of this output is used for winter road maintenance (石头盐矿开采是地下采矿过程。在这个过程中通过钻孔、爆破和破碎的岩石把盐挖出地面。出产的主要部分用作冬天的路面维护。) | |||
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