It expounds various mining methods and steps, including the bench demarcated, plan mining bench top and bottom floor, the coal and overburden amount of plan mining, and coal quality indicators.

阐述编制露天矿的各种开采计划的方法和步骤，以及其台阶划分、计划台阶顶底板的控制、编制剥离量和采矿量及其煤质指标等；

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Since the wastewater contains large amount of degreasing cleaners, directly dispose will lead to the waste of detergent and the overburden of water treatment.

被排放的废水中仍然含有大量脱脂剂，如果直接排放将造成试剂的浪费，同时也为水处理增加了负担。

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