Abstract: In order to fully grasp the production status and process adaptability of a gold ore dressing plant，in view of the problems of low metal recovery rate，difficult recovery of fine gold and uneven equip‐ ment load in the beneficiation process，the whole process investigation and raw ore process mineralogy re‐ search are carried out.The key processes such as crushing and washing screening，grinding and classifica‐ tion，flotation and the metal grade，recovery rate and classification efficiency of products in each stage are systematically analyzed by means of field investigation，production index analysis，ore multi-element and mineral composition test.The results show that the gold and silver in the ore are the main recoverable metals， mainly in the form of inclusions and fine particles，and some gangue minerals have adverse effects on the re‐ covery process.There is room for optimization in many links of the beneficiation process，especially in the re‐ covery and grading control of fine-grained gold. The process flow diagnosis and optimization should be car‐ ried out regularly to improve the metal recovery rate and process stability.

Key words: beneficiation production process, product index, energy saving and consumption reduc‐ tion, process investigation, slime flotation