Abstract:Purpose: The quantity of residual ore pillar in a lead-zinc mine is greater, so it is urgent to study a safe and efficient mining method and technology. Method: The comprehensive comparison and selection of technology, safety and economy for various feasible mining methods are carried out. Aiming at the possible safety risk in the mining process of residual pillar, the safety simulation and demonstration work is carried out by using the method of 3D modeling and numerical simulation. Result: The research and design of a new mining method and technology combining sublevel rock drilling, stage caving with stage backfilling are carried out, its innovation is reflected in the following: according to the collapse of roof and sidewall cemented backfill, decide whether to keep permanent pillar of 3-5m thickness and carry on stage cemented backfill. Conclusion: Through the practice of actual mining of the whole Wan 11 line pillar, the amount of geological resources is 231,000 tons, the actual extracted ore tonnage is 264,400 tons, the recovery rate is 95%, the dilution rate is 17%, and the comprehensive production capacity is 460 tons per day. In the mining process of residual pillar, it is safe generally, the cracking of the adjacent pillars have not further developed, and have not caused the destructive loss of ore pillar resources, it has no bad effect on the surrounding surface river bed, main shaft and so on. Although there is still some caving and mixing of large-volume cemented backfill, the overall stability is in a controllable state. The new mining method is safe, feasible and efficient. Significance: The implementation of this project has achieved significant economic and social benefits for the mine, it provides research methods and reference results for the efficient utilization of similar residual ore resources.