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经济剥采比是确定露天矿境界的重要因素．指出了经济剥采比的计算过去没有考虑资金的时间价值，而且采用了“矿井优先”的错误原则．在此基础上，提出了当量经济剥采比的新概念，既考虑了回采率和安全性两个主要因素，又体现了“露天优先”的正确原则．建议将确定露天矿境界的原则修正为：境界剥采比小于等于当量经济剥采比．
Economic stripping ratio is to determine the level of open-pit mines an important factor. Pointed out that the calculation of economic stripping ratio did not consider the time value of funds in the past, and adopted the wrong principle of “mine priority”. On this basis, a new concept of equivalent economic stripping ratio is put forward, which not only considers the two main factors of recovery rate and safety but also reflects the correct principle of “open air priority”. It is suggested to amend the principle of determining the realm of open-pit mines as follows: the ratio of stripping to the realm is less than or equal to the equivalent economic stripping ratio.