Abstract: The Au and REE content analysis in rocks and ores show that Au source of the Xiaotazigou gold deposit is complicated. Gold and other ore-forming materials were derived when hydrothermal fluids passed through the Archean metamorphic complexes, as well as through some granitic porphyry and diorite porphyrite. They were activated and migrated when the Beidashan granite was emplaced. Au/Ag ratio and the diagram of (As+Sb) versus (Cu+Pb+Zn) show that Beidashan monzonitic granite provided necessary heat for the formation of the deposit. The main ore bodies found up to now are mainly located to the south of the monzonitic granite. The area within 1-3 km south of the Beida-shan monzonitic granite is thought to be the most favorable sites for the search for new parallel and high-grade ore bodies. In the No.1 lode, the largest one in the area, the ore-forming temperature changes greatly from 160-400℃, and the salinity of the ore fluids also changes greatly (0%-9%) with appa-rent boiling phenomena while the smaller lodes are of higher temperature（280-400℃）and lower salinity（<5%）.

Key words: Xiaotazigou gold deposit, trace elements, fluid inclusion, REE, ore-searching targets