There are many complications that influent open-pit limit and the economic strippingratio is the most important one.
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。
2
So, using the internal dumping could decrease the waste volume or increase the production, reduce the strippingratio, and improve the economic benefit.
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。
3
The feasibility of adopting steep slope mining at main quarry is discussed against strippingratio is high in flood peak period, and the preliminary scheme is put forward.