Abstract: In order to effectively recovery of pillars resources in an iron-zinc polymetallic deposit under the condition of complex multi-latyer goafs,taking the the upper ore-bodies of the three section of the mining area as the study example,according to mining technical condition and the solid model of goaf of the mining area,the technical scheme for processing the goafs and recovery the pillars by using filling method and open-stope subsequent filling method respectively is proposed.The stress-stain and ground subsidence during the recovery process of pillars are simulated and analyzed by using FLAC3D software.The results show that:①during the process of pillars recovery,the rock stress is transferred,the surrounding rock and the filling body are compressed,and the roof is pulled.Besides that,in order to reduce ground subsidence caused the pillars recovery,the protection measures mainly for not mining the pillars of the first section,and secondly for reserving small amount of raw pillars in the key areas is put forward.

Key words: Goaf treatment, Pillar recovery, Mining method, Numerical analysis