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我国一些大型露天铁矿都已进入深凹露天,运输条件恶化,剥岩量增加,而装运设备基本未变,因而矿石产量下降。如大孤山铁矿,六十年代产量曾突破一千万吨,近年则一直在三百多万吨徘徊,剥采比已接近5米~3/米~3。现在国家急需品位较高,选矿较易的铁矿石,投资与设备却难以增加,因此,将一部分围岩推迟几年或十年剥离,便是增产矿石的一种简易可行又可靠的方法。
Some large-scale open-pit iron mines in our country have entered the deep and open air, the transportation conditions have deteriorated, the amount of stripping rock has increased, and the shipping equipment has remained basically unchanged. As a result, the output of ore has dropped. For example, the Dagushan Iron Mine has exceeded 10 million tons of output in the 1960s and has been hovering over 3 million tons in recent years. The ratio of stripping to mining has been nearly 5-3 m / 3. Nowadays countries are in urgent need of higher grade and easier beneficiation of iron ore, but the investment and equipment are hard to increase. Therefore, dewatering a part of surrounding rock for several years or ten years is a feasible and reliable method for increasing ore production.