An in⁃depth process mineralogical analysis of a carbonaceous gold ore was conducted, identifying keyfactors affecting beneficiation efficiency. With the beneficiation tests, the grinding fineness was successfully reduced,and an efficient carbon inhibitor was selected, effectively mitigating the interference of organic carbon in thegold flotation process. Under the condition of a raw ore gold grade of 1.84 g / t , the whole⁃process closed⁃circuit testachieved outstanding indices with a gold concentrate grade of 37.81 g / t and a gold recovery rate of 91.20 %. Based onthe small ⁃scale test results, industrial ⁃scale trials were conducted to optimize process parameters, including grindingfineness and reagent regime. The test results demonstrated significant improvements in production indices, with theweighted average gold grade in the concentrate increasing from 24.31 g / t to 40.25 g / t and the weighted averagegold recovery rate rising from 88.02 % to 91.42 %. Moreover, the reduction in grinding fineness substantially loweredproduction costs.