Different condition of economy and technology define different open pit limit.

不同的经济技术条件确定不同的开采境界.

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Open - pit limit optimization is an important content in open - pit mining design and production process control.

露天境界优化是露天矿开采设计和生产过程控制的重要内容.

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At present, many open - pit mine face serious threat of underground goaf in pit limit in china.

目前国内有不少露天矿山在生产过程中面临着境界内地下采空区的严重威胁.

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