Abstract:The chemical composition, mineral composition, occurrence of gold, distribution characteristics of gold-bearing minerals and gangue minerals, and occurrence of elements of the ore were studied in detail by means of automatic process mineralogical parameter analysis system (BPMA), X-ray diffraction (XRD), X-ray fluorescence spectrometer (XRF) and other testing methods. The results show that: 1. The content of Au in Carlin-type gold deposits is 4.75 g/t, which is the most important valuable element, 59.36% of the gold exists in the form of coated gold, and the highest coated gold is 42.95% in sulfide ore. Secondary exists in the form of carbonaceous gold, and trace exists in the form of bare gold. Due to the high content of coated gold, it is difficult to achieve monomer dissociation or exposure even under fine grinding conditions, which is not conducive to improving the recovery of gold ore. The main gold-bearing sulfide minerals are pyrite and arsenopyrite. Gangue minerals are mainly dolomite, quartz, calcite, clay minerals, etc. 2, pyrite mainly concentrated in 0.015~0.02mm size, arsenopyrite mainly concentrated in 0~0.005mm size, dolomite mainly concentrated in 0.104~0.147mm size, calcite mainly concentrated in 0.104~0.147mm size, quartz mainly concentrated in 0.104~0.147mm size, quartz mainly concentrated in 0.104~0.147mm size. Among the five minerals, arsenopyrite has the largest fine particles, followed by pyrite, and calcite, dolomite and quartz have more coarse particles. With the decrease of material size, the grade of pyrite in ore will increase. 3. As the main gold-bearing substance, pyrite has fine particles and is mainly embedded in sericite, quartz, dolomite and other minerals, and some monomers also exist. In order to fully dissociate pyrite monomer, it is suggested to increase grinding time in grinding stage or adopt multi-stage grinding process.