Abstract: The gob group in a gold mine owns the characteristics of age-old goaf,unstable mine rock,and complicated residual resources.In order to efficiently and economically realize recovery of high grade residual ore pillars in safety in goaf,the scheme design for recovery of ore pillars and residual ores within wall rocks was given,based on on-site survey,tests and economic analysis and combined with production capacity,recovery rate of residual ore,and construction difficulties etc.Flac^3D inversion is adopted to analyze the whole procedure of the residual ore recovery scheme,and several sets of simulative monitor points are arranged within the adjacent pillars,roof and floor and artificial pillars in the area of residual ore.Some indexes of stress,strain and plastic zone before and after recovery of residual ore are obtained by numerical simulation.Through the comparative analysis,the gob stability before and after disturbance resulting from residual ore recovery is evaluated to verify the reliability of the mining activity.The evaluation method and conclusions have reference value to following case of residual ore recovery and the similar mines.

Key words: Recovery of residual ore, Numerical simulation, Gob stability