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我矿原设计采用竹笆假顶分层崩落法及浅孔留矿法。出于促进生产的目的,1974年开始在董家坂矿段701采区试验无底柱分段崩落法,其后即在全矿备采区推行,主要存在问题是矿石损失严重,不能形成预期的生产能力。近年以来,通过试验改进回采方案,使主要技术经济指标不断有所改善。 (一)开采技术条件 矿体属前寒武纪沉积变质的硅质磷灰岩矿床,赋存在结晶片岩与混合片麻岩之间,呈倾斜矿体产出,倾角20～55°,水平厚度5～25米、沿走向与倾向均有变化;矿石较稳固,f=4～6。直接顶除局部是稳固的片岩和大理岩外,皆为含石英碎石的不稳固锰土层,厚度2～5米不等;再上为稳固的大
My original mine design using bamboo roof false roof subsidence and shallow hole stay mining method. For the purpose of promoting production, in 1974 began to Dongjieban mining section 701 mining area without pillar caving method, and then in the whole ore mining area, the main problems are serious loss of ore, can not form the expected Production capacity. In recent years, the improvement of the major technical and economic indicators has been continuously improved through trial improvement of the mining program. (I) Mining Technical Conditions The ore-bearing siliceous apatite deposit, which belongs to Precambrian sedimentary metamorphism, exists between the crystalline schists and the mixed gneisses, with a tilted ore body with a dip angle of 20-55 °. The horizontal thickness 5 ~ 25 meters, along the trend and tendency have changed; ore is more stable, f = 4 ~ 6. In addition to the top of the local top is solid schist and marble, all with quartz crushed unstable manganese soil thickness of 2 to 5 meters; then on a large solid