Abstract: A high sulfur lead-zinc deposit in Yunnan is a new orebody found in the lower part of the present mining area.In order to determine the reasonable development process,the process mineralogy of the lead-zinc deposit was studied by means of chemical analysis,microscope observation and MLA analysis.The results showed that: ① The valuable elements in the ores are mainly Pb,Zn,Fe and S,with contents of 3.20%,3.04%,26.36% and 30.84%,respectively,which belongs to high-sulfur and low-grade lead-zinc ore.② The ore composition is complex and consist of about 26 kinds of constituent minerals.The useful minerals are mainly pyrite,galena and marmatite,and the gangue minerals are mainly quartz,kaolinite and montmorillonite.③ The ore has dense disseminated structure,massive structure and vein-like structure,and the mineral mainly has inclusion structure,euhedral—semieuhedral—allohedral granular structure,opacities structure,internal cleavage structure and so on.④ The embedded characteristics of the main minerals are complex.Pyrite，galena and marmatite have close symbiosis relationship and are obviously wrapped each other.It is one of the main factors unfavorable to mineral separation that the distribution of minerals in ores is complicated and the content of useful minerals varies greatly.The recommended test flow is lead and sulfur iso-flotation + lead and sulfur separation—zinc and sulfur iso-flotation + zinc and sulfur separation.

Key words: high sulphur, lead-zinc mine, low grade, process mineralogy, the embedded characteristic