Abstract: There are a lot of high arsenic copper(silver) deposits in Yunnan province.In order to provide basis for investigating the beneficiation and smelting of this type of ore,the process mineralogy of a high arsenic copper-silver ore was researched.The results showed that:①the ore mainly exists in fine grained disseminated,banded and brecciform structure,and its main texture are allotriomorphic-hypautomorphic-xenomorphic granular,lepidoblastic,cataclastic,and metasomatic relict textures etc..②The main metallic minerals are chalcopyrite,iron antimony tennantite,arsenopyrite,pyrite,wittichenite,less malachite,and occasionally digenite;The non metallic minerals are mainly quartz,muscovite  (sericite ),dolomite,calcite,feldspar etc..The main useful mineral is chalcopyrite,followed by iron antimony tennantite and wittichenite,and the harmful mineral is arsenopyrite.③The ore belongs to high-silver copper sulfide ore.Copper sulfide accounts for 97.25% of total copper,and 94.07% of silver is distributed in copper sulfide minerals.In the process of floating copper,silver will be recovered comprehensively with recovery of copper minerals.④The chalcopyrite and iron antimony tennantite are mainly fine disseminated with dissemination size of ranging from 0.01 to 0.1 mm,so that there are certain requirements for grinding fineness.⑤The ore can be treated by the process of arsenic inhibition and copper flotation.The copper-silver concentrate with high arsenic can be treated by calcination or calcination + wet leaching process to lower arsenic.

Key words: High arsenic copper-silver ore, Process mineralogy, Chalcopyrite, Iron antimony tennantite, Arsenopyrite