借用露天开采境界优化的常用动锥法，对外排土场境界赋值，且可用计算机实现境界赋值全过程。
The moving cone method which is usually used to optimize the pit limits is used to establish the external spoil pile limits. with the aid of a computer, it can establish spoil pile limits rapidly.
相对于地下开采的废石场，露天开采的排土场占地面积要大得多。
Relative to the waste rock dump of underground mining, open-pit mining needs a larger one.
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