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一、保护貧矿的方法用上一水平的废石充填超前回采富矿的空区的方法,不能保证可靠的维护顶板和下部被采空了的贫矿,这是因为充填体不密实,並在其下面放矿的过程中使它不断的变碎。因此采空区必须采用这样的充填料:在15年內能可靠的维护下部被采空了的贫矿,最完全的回收矿柱里的富矿,並在回采贫矿时能降低损失贫化。满足这个要求的充填料是炉碴——砂子混
I. THE PROTECTION OF LEAN-MINING METHOD The method of pre-mining the open area of rich ore with the previous level of waste rock filling can not guarantee the reliable maintenance of lean mines on the roof and in the lower part of the mined-out area because the filling bodies are not dense and In the course of its ore mining process to make it continuously broken. Therefore, gobs must be filled with such stuffing that within 15 years reliable maintenance of under-mined lean mines, the fullest recovery of the ore in the pillars, and the reduction of depletion can be achieved when mining lean mines. Fill to meet this requirement is ballast - sand mixed