Abstract: In order to have greater understanding on geological features of Dongshengmiao ore deposit,and perfect the geological background data of mining area,the deep ore samples of polymetallic deposit are collected and its ore components are analyzed by adopting the electron probe microanalysis (EPMA).The experimental results showe that,the deep ore body of Donghengmiao mining area mainly occurs in the form of sulfide,which are composed of pyrite,galena,sphalerite,pyrrhotite and a small amount of chalcopyrite.The sphalerite mainly has an intergrowth relationship with pyrite,and less chalcopyrite is mainly found around the pyrite.In addition,trace amounts of gold and silver particles are also distributed in the gap of pyrite and pyrrhotite.Except for the sulfide minerals mentioned above,some silicate minerals such as potash feldspar,barium silicon diaspore and biotite,some carbonate minerals that contain Ca,Mg and Fe and some iron and nanaganese oxides are also detected.It can be confirmed that the deep primary ore in Dongshengmiao mining area is mainly composed of sulfide minerals,and the symbiotic relationship between different minerals may show some difference,which have great significance in seeking for certain types of ore body.

Key words: Dongshengmiao mining area, EPMA, Composition analysis