露天矿深部水平的设计实践、科研成果和一些露天矿的生产实践表明,即使不增加采矿生产能力,也必须对矿山进行定期的改建。分析表明,之所以要定期改建,是因为最初圈定的露天矿境界发生变化,也因为露天矿开采深度的增大导致运距增加和矿山技术条件恶化,从而,引起矿山运输设备效率降低,实际上使矿山年平均生产能力有所降低了。如果不及时采取扩建措施和追加基建投资,将造成剥离工程落后,备采矿量 Deep-level design practice, scientific research and some open-pit production practices in surface mines have shown that mines must be retrofitted regularly, even without increasing their mining capacity. The analysis shows that the reason for the regular alteration is that the initial delineation of open-pit mines has changed, and because of the increased mining depth of open-pit mines, the increase of the distance and the deterioration of the technical conditions of mines have led to the decrease of the efficiency of mining equipment. In fact, The annual average mine production capacity has been reduced. If we do not take timely expansion measures and additional infrastructure investment, will result in the stripping project behind the amount of reserve