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近10～15年来,各种燃料和能源的价格不断上涨。例如,1970～1980年,国外燃料价格增涨了六倍。苏联工业企业电能价格增涨了一倍。与此同时,采矿企业每采一吨金属的能源耗量也增加了;这是由于矿山的延深,使得随之而来的排水、运输、提升、通风以及其他工艺过程等费用的增加所致。例如,露天矿每延深10米,则开采1000吨矿岩的用电量就增加3～4千瓦小时。由于矿石中金属含量的下降,为了得到同样数量
In the recent 10 to 15 years, the prices of various fuels and energy have been on the rise. For example, from 1970 to 1980, foreign fuel prices rose sixfold. Soviet industrial enterprises doubled the price of electricity. At the same time, the energy consumption per tonne of metal used by mining companies has also increased; this is due to the deepening of the mines, resulting in the consequent increase in costs of drainage, transportation, upgrading, ventilation and other processes . For example, for every 10 meters of surface mine extension, the power consumption for mining 1,000 tons of ore rock increased by 3 to 4 kilowatt-hours. Due to the decrease of metal content in ore, in order to get the same amount