以某铁矿34~38勘探线为基础，按20 m 一个开采标高，分别计算了各个不同开采标高的矿体及岩体面积，分析了境界内剥离岩体与所采矿体的面积比，并与确定的经济合理剥采比进行了比较，若境界剥采比小于经济合理剥采比，应优先选用露天开采，以此可确定露天开采的最低开采标高。%Based on 34 ~ 38 exploration line of some ore mine,the paper calculates the ore body and its coverage by the 20 m mining elevation, analyzes the area ratio of the stripped rock mass and exploited ore body,compares it with the identical economical and reasonable stripping ratio, indicates the open exploitation is superior if the stripping ratio is less than the economical and reasonable ratio.
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