The ratio of overburden of the north part to no. 6 line is calculated.
2
从而可以减少剥离量或增加采出矿石量，降低剥采比，提高矿山经济效益。
So, using the internal dumping could decrease the waste volume or increase the production, reduce the stripping ratio, and improve the economic benefit.
3
影响露天矿开采境界的因素很多，其中一个最重要的因素就是经济合理剥采比。
There are many complications that influent open-pit limit and the economic stripping ratio is the most important one.
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