Abstract: To address the problems of low mechanization level，poor production efficiency，and high loss and dilution rates of the 56# steeply inclined thin ore vein in the Jinchanggouliang Gold Mine，com‐ bined with the ore body geometry and rock properties，a study on the medium-deep hole segmented open�cut followed by waste rock filling mining method was conducted. Through rock mechanics tests and RMR classification system evaluation，the stability of the rock and ore was determined to be Grade II，providing a basis for the application of this mining method. After process optimization，the mining area was arranged with ore blocks along the strike direction，with a segmented height of 10 m. A YGZ-90 type rock drill was used for medium-deep hole blasting，and the WJD-1 type electric remote-controlled loader was used to extract the ore. The underground waste rock filling formed a complete mining process system. The applica‐ tion results showed that compared with the original mining method，using the medium-deep hole segment‐ ed open-cut followed by waste rock filling mining method resulted in a reduction of the ore loss rate from 5.6% to 1.0%，a decrease in the dilution rate from 45% to 34.7%，an increase in the mining area produc‐ tion capacity from 30 t/d to 100 t/d，a reduction in the total filling cost by 275 yuan/m³，significantly im‐ proving the safety and efficient mining level and resource recovery rate of the mine，and providing techni‐ cal reference for similar steeply inclined thin ore vein mining projects.

Key words: Jinchanggouliang Gold Mine, medium-deep hole segmented open-cut followed by waste rock filling mining method, optimization of mining method