关键词: 地下开采, 隔离矿柱, 三步骤回采, 高颈漏斗, 拉槽爆破

Abstract: In order to ensure the successful mining of isolated ore pillars in the third step of Dongguashan Copper Mine,in view of the serious deterioration of the mining technical conditions in isolation ore pillar mining compared with the mining room in the first step and ore pillar mining in the second step,combing with the negative influence factors of isolated ore pillar mining,the technical scheme including large diameter bottom funnel,vertical deep hole drawing groove,backward ladder blasting and downward hole layout was put forward,so as to further optimize the mining technique,effectively control the ground pressure hazard and improve the stoping efficiency,and enrich and develop the isolation pillar threestep mining technique.The practice results showed that the successful application of the above technical measures could ensure the safe and efficient recovery of isolated ore pillars,and realizes the comprehensive recovery of mineral resources from 70% of twostep recovery to 81% of threestep recovery,which could provide reference for the exploitation of similar mines in China.