The belated enforcement of mining safety standards has led to closure of many small mines and temporary shortage of coal.
采矿安全标准姗姗来迟后，许多小煤矿被关闭，导致了暂时性的缺煤。
These are mainly attributed to the mining's geological background, the distribution of mercury belt and the mercury mining scale, and the mine closure time.
在沉积物中汞含量的比较也是得到相同的结果，这主要与矿区的地质背景、汞矿带的分布、还与汞矿开采规模、汞矿停产时间有关。
These are mainly attributed to the mining's geological background, the distribution of mercury belt and the mercury mining scale, and the mine closure time.
在沉积物中汞含量的比较也是得到相同的结果，这主要与矿区的地质背景、汞矿带的分布、还与汞矿开采规模、汞矿停产时间有关。
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