To study the impact of combined open⁃pit and underground mining on the stability of blind shafts, agold-copper mine in China was taken as the engineering background. The current status of the mine’s blind shafts wasinvestigated, and potential failure modes of the blind shaft and factors influencing its stability were analyzed. A refined3D numerical calculation model of the mining area was established based on actual geological conditions. Simulations wereconducted according to the combined open⁃pit and underground mining plan, so as to analyze the impact on the stability ofthe blind shaft. The influence of combined open⁃pit and underground mining on the stability of the blind shaft wassystematically studied in terms of shaft displacement and radius convergence. The inclination, curvature, and maximumaxial deformation of the blind shaft were calculated and analyzed according to relevant standards. The results indicatethat under combined open⁃pit and underground mining, the blind shaft does not experience axial deformation, inclinationdeformation, or curvature deformation damage. The combined open⁃pit and underground mining has minimal impact onthe stability of the blind shaft and does not affect its normal operation. The blind shaft can maintain stability, andthe research results can provide technical support for subsequent shaft hoisting, maintenance, and safe production inthe mine.