Abstract: Jiaojia gold deposits is a famous large gold deposits of tectoniclastic alterated rocks which lead to special attention of the experts as a new type of gold deposit named “Jiaojia type” gold deposits. With the continued exploitation， many characteristics of the process mineralogical properties of the oral greatly changed. In order to improve gold recovery rates and determine the ore dressing scheme， the characteristics of goldbearing minerals of deepseated deposit of the Jiaojia gold mine was researched. The researches on the types of goldbearing minerals， gold occurrence state， grain sizes of gold mineral etc. were carried out with optical microscopy， electron microscopy and energy dispersive analysis. The results showed that the major goldbearing minerals in Jiaojia gold ore were pyrite and chalcopyrite， and the minor were sphalerite， galena and quartz in which the gold bearing minerals in sulfide accounted for 8650% and the gold bearing minerals in silicate accounted for 1350%. The grain size of gold mineral in the pyrite and chalcopyrite was much bigger than that in the silicate minerals. The sizes of the gold particles in the pyrite， chalcopyrite and quartz were 0074~0037mm， 0043~ 0037mm and>0037mm， respectively. Gold occurrence states of Jiaojia gold ore were the fissures gold accounted for 6551%， wrapped gold accounted for 1819% and intercrystalline gold accounted for 1666%.

Key words: Jiaojia gold mine, goldbearing mineral, deepseated, gold, pyrite