Study on the sublevel caving technology in deep thick ore body

There are secondary structural fracture distribution in the 7^# ore body and wall rock of the mine.at the top of the section, it contains the 5-10 m fault gouge, it is soft and easy to take, the ore body strong is low and easy to caving, and don’t adopt the way of large span under open stoping mining.At the -350 m and above the section, which adopt the dry filling mining way, but it is high loss of ore and poor safety condition and low production capacity.In order to improve the recovery rate of the ore, reduce the rate of dilution, be sure of the safety of the stope operation.So transition to the method that mining at the -350 m in terms of the contrast of the mining method and analysis.Under the -350 m, it should be the subsection caving method with low poverty and loss that it replace the dry filling mining method.Although analyzing the height of the section, distance between paths, caving step distance, as well as selection of recycling approach to optimize the sublevel caving stope structure, and to ensure stope parameters as follow:subsection height 6 m; path spacing 7-8 m, caving distance 1.1 m, maximum bottom height 4.5 m, the industry experiment show that the 7^# ore body can be exploited with high efficiency, through low cost, low loss rate, good safety environment and controllable dilution rate.