关键词: 无底柱分段崩落法, 贫矿资源, 有限回采空间, 放矿试验, 贫损控制

Abstract: It is of great significance for the economic benefit of the mine and environmental protection to do a good job in the ore loss and dilution control of sublevel caving. However,when the mining conditions of the deposit are complex and the ore grade is low,the difficulty of loss and dilution control will increase significantly. Under this condition,how to do a good job in ore loss and dilution control has always been an important concern in the direction of mining by sublevel caving method. The stope of sublevel caving method in West No. 2 Mining Area of Longshou Mine can only be arranged with 4 sublevels,and the mining space is very limited,which is not conducive to the control of ore dilution and loss. In addition,the ore grade in West No. 2 Mining Area is low but the economic value is high,so it is necessary to strictly control the ore dilution and loss in the mining process. In view of the complex mining conditions and dilution control requirements in the West No. 2 Mining Area,a combined low dilution and loss recovery scheme of " total controlled ore drawing in the first mining sublevel,low dilution ore drawing in the middle sublevels,and low dilution ore drawing in the last sublevel+auxiliary drifts recovery of residual ore" has been constructed. A physical ore-drawing model with high simulation is designed and made to carry out the experimental study on this scheme. The experimental results show that the scheme can make the ore recovery rate of the sublevel caving stope reach 75. 6%,while the waste rock mixing rate is only 6. 0%,even without considering the recovery of residual ore in the last sublevel,which significantly reduces the ore dilution on the basis of ensuring the ore recovery rate. After the scheme is applied

Key words: sublevel caving mining method,low-grade deposit resource,restricted mining space,ore-drawing experiment,ore loss and dilution control