Abstract: In this work， the characterization of process mineralogy of the gold ore from Baolun gold mine was studied through chemical analysis， X-ray diffraction， optical microscope and scanning electron microscope analysis. That can provide a theoretical basis and guideline to select ore dressing process. The results show that the Au and S contents of the ore are 10.1g·t^-1 and 0.65%， respectively， and the main gangue minerals are quartz and muscovite. The gold minerals in the ore are mainly native gold with the relative content of 90.58%. The particle size range of gold mineral is wide， and the contents of giant-grained gold(>300μm)， coarse-grained gold(74~300μm)， medium-grained gold(37~74μm)， fine-grained gold(10~37μm)and micro-grained gold(0.10~10μm)are 3.84%， 28.85%， 18.04%， 23.52% and 25.75%， respectively. The occurrence state of gold minerals in the ore is wrapped by gold， intergranular gold and fissure gold， the content of which accounts for 48.37%， 43.24% and 8.39%， respectively. Based on the researches of process mineralogy， a Knelson gravity separation-flotation technology cooperated with multi-stage grinding process is proposed.

Key words: quartz-vein-type gold deposits, process mineralogy, gold mineral, size distribution, occurrence state