提出了3种矸石充填开采对提高资源采出率、延长矿井服务年限的重大意义及推广应用价值。
The backfilling methods with refuse were beneficial to improving mining rate of resource and prolonging mine life.
针对服务年限比较长的一些国有老矿，运用矿井的现有设备进行技术更新，充分体现了少投入，多产煤的原则。
Direct to the longer service time of some old state_owned mine, apply present mine equipments to renew them can reduce investment and inereasing coal output.
本文采用成本与效益分析的方法，从经济上对矿井合理服务年限的定量问题，作了理论上的探讨。
The optimal service life of a mine is discussed theoretically from economic point of view by analysing the cost and benefit.
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