Abstract: Rock mass stability analysis is a prerequisite for safe mining operations. Traditional stability analysis methods,
which focus solely on large-scale regional assessments,exhibit inherent limitations. In contrast,three-dimensional (3D) digital
technology enables refined stability zoning of rock masses,thereby enhancing the accuracy of stability evaluations. This study
employs 3D digital technology to reconstruct a 3D digital model of a copper mine using Dimine software. By integrating borehole
Rock Quality Designation (RQD) data,a stratigraphic model of the mining area and a 3D rock mass model incorporating RQD
information were established,facilitating refined stability analysis and engineering applications. Results reveal significant spatial
variations in rock mass stability,validating the limitations of conventional analytical approaches and demonstrating the superiority
of the 3D reconstruction model. The model was applied to stability analysis and stope design in the 7MU section of a copper
mine,yielding tailored design schemes:stope widths in the stable northern section should not exceed 11 m,while those in the
less stable southern section should remain below 9 m. These implementations markedly improved the level of precision in mining
operations. This research provides novel insights for mine design optimization and holds significant practical engineering
value.