Abstract: The grade of copper,zinc and iron in a polymetallic mine in central Tibet are 0.48%,7.75% and 33.57%,respectively.In order to develop and utilize the ore rationally,detailed process mineralogy of the ore was studied detailly by means of MLA,SEM-EDS,X-ray energy spectrum analysis and electron probe.The occurrence states of valuable elements,mineral composition and content,the distribution characteristics of target minerals,and the dissociation degree of the main minerals,as well as the factors affecting the comprehensive and efficient recovery of valuable elements were found out.The results showed that copper mainly occurs in chalcopyrite and covellite with a distribution rate of 95.66%.Zinc is produced in the form of marmatite and smithsonite,with distribution rates of 92.11% and 7.89%,respectively.Magnetite is the main occurrence state of iron with a distribution rate of 32.68%.Marmatite coats a large number of fine-grained,milky drop pyrrhotite and chalcopyrite,and is closely embedded with pyrite.Part of irregular marmatite is closely associated with magnetite and gangue minerals.Fine chalcopyrite closely coexisted with pyrite,small amount of coarse chalcopyrite contains marmatite enclosures.Magnetite and gangue minerals interweave with a stockwork structure.The research results provide a theoretical basis for determining the appropriate separation process and reagent system,and realizing the comprehensive recovery of valuable elements in the polymetallic ore.

Key words: polymetallic ore,material composition,process particle size,dissemination characteristics,dissociation degree,occurrence state