西方资本主义国家进入70年代以来,矿山采山的矿石,以露天开采占较大的比重,逐年有所发展,达到占总采出量的65%以上,发展到较高水平,超过前几个年代。这主要是露天开采具有它固有的优点——生产能力大,总同收率高,易于控制品位,工作条件好和安全等,同时也由于对大型低品位的矿山进行了对投资和生产费用经济问题研究分析的结果,使这种过去认为不值得开采的低品位矿山可以开采。在这方面,露天矿新设备和新技术的发展,设备生产能力的提高所起的作用,比其它任何单一因素都更重要。在当前,由于现代工业的发展,迫切需要 Since the 1970s, western capitalist countries have been taking ore from the mines to account for a large proportion of open-pit mining and have been developing year by year, reaching more than 65% of the total output, reaching a higher level than the previous ones Age. This is mainly due to its inherent advantages of open pit mining - large production capacity, high total yield, easy to control the grade, good working conditions and safety, but also because of the large low-grade mines for investment and production costs of the economy The results of the analysis of the problem make it possible to mine low-grade mines that were not considered worthwhile in the past. In this respect, the role played by the development of new equipment and technologies in open-pit mines and the improvement of equipment production capacity is more important than any other single factor. At present, due to the development of modern industry, it is urgently needed