Abstract:Purpose: In view of the technical problems of the 6111 pillar stope in Hongling lead-zinc mine, such as the broken lithology conditions, structural development and difficult forming of borehole collapse, in order to meet the requirements of scientific optimization of mining methods and efficient mining of the 6111 pillar, this paper presents three distinct pillar mining strategies. Methods:The stability of the surrounding rock within the goaf of the Hongling lead-zinc mine was assessed and analyzed utilizing the Mathews method, the stress distribution pattern of the goaf was revealed, and the hydraulic radius of the stable area, transition area and caving area was calculated, and the hydraulic radius of each of the three sections was finally obtained. Results:The hydraulic radius of the three mining schemes was calculated and their safety was analyzed successively. It can seen that scheme I is the safest, scheme II is the second, and scheme III is the worst. Based on the four aspects of safety, production capacity, technical difficulties and flexibility, the three pillar mining schemes were optimized. Conclusion:The findings indicate that Scheme I represents the optimal stoping strategy. Significance:The study offering valuable insights into the selection of mining methods at the Hongling lead-zinc mine, and also accumulates experience for the mining of complex ore bodies of the same type.