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无底柱分段崩落法贫化大是由现行放矿方式造成的，改用不贫化放矿后可使矿石贫化率在回采率不降低情况下大幅度下降到8％以下。不能一步到位的实施不贫化放矿的矿山可以采用低贫化放矿，也可获得在矿石回采率不降低情况下贫化率有较大下降的效果。
Subsidence-free subsidence caving method is largely caused by the existing ore-drawing methods. After the ore is converted to non-depleted ore, the ore dilution rate can be drastically reduced below 8% without reducing the recovery rate. Weak ore leaching can be adopted for the mines that can not be completed in one step without lean ore draining and the effect of reducing the leaching rate greatly if the ore recovery rate is not reduced can be obtained.