Abstract: In order to ensure safe production in mines，accurate rock mass quality assessment and the revelation of basic mechanical properties of rocks are of great significance. This study focuses on the rock mass of the 500 m，660 m，and 855 m level roadways in the Huaaobaote Silver-Lead metal mining in Inner Mongolia. Uniaxial compression，splitting，and shear rock mechanics tests were conducted to obtain rele⁃ vant rock mechanics parameters. Additionally，investigations and analyses of joints and fissures were car⁃ ried out in different mining areas of the middle section of the 500 m level. Based on these results，a compre⁃ hensive assessment of rock mass quality was conducted by combining the RMR method with the Q-system evaluation results.The results indicate that the compressive strengths of the rocks at the 500 m，660 m，and 855 m levels are 63.22 MPa，33.69 MPa，and 59.56 MPa，respectively. The elastic moduli are 30.10 GPa， 21.89 GPa，and 36.68 GPa，respectively. The tensile strengths are 7.23 MPa，3.85 MPa，and 4.66 MPa，re⁃ spectively，while the cohesion values are 11.72 MPa，9.49 MPa，and 15.70 MPa，respectively. The rock mass at the 500m level generally exhibits well-developed structural plane fractures，slight weathering，and joint surfaces ranging from smooth to moderately rough.The RMR scores for the I，II，and III stope areas at the 500m level are 52，52，and 59，respectively，while the corresponding Q system scores are 6.7，7.3， and 4.1. Based on the comprehensive rock mass quality evaluation，the rock mass at the 500 m level is clas⁃ sified as average quality (Class II to III).The findings of this study provide a reference for rock mechanics and rock mass quality evaluation in silver-lead metal mining areas.

Key words: Silver-Lead mine, rock mechanical parameters, joint and fracture survey, rock mass quali? ty classification