Abstract: The geotectonic location of the Xinmin Gold Deposit in Western Liaoning Province is located on the northern margin of the North China plate and at the easternmost end of the Yanliao metallogenic belt.It is a gold deposit related to ductile shearing.In order to explore new blind orebodies in the deep part of the mining area,the metallogenic model is constructed under the guidance of geological metallogenic theory,the research on the axial zoning sequence of primary halo is done,and the sample data of 100 m middle section of No.59 exploration line,ZK5908 and ZK5909 drilling holes in the mining area is systematically analyzed.The results show that：① The strata of Xiaotazigou Formation of Jianping Group provide material source for the formation of gold deposit.According to isotope research results,the source of metallogenic material is related to surrounding rock and granite.The source of metallogenic fluid is mainly magmatic water and metamorphic water,and atmospheric water is added in the later stage.② Affected by ductile shear,ore bearing fluid migrates upward along the ductile shear zone,and Au mainly migrates in the form of ［Au (HS)2］-.With the change of temperature,pressure,oxygen fugacity and pH value of oreforming fluid,the stability of gold sulfur complex is destroyed,gold is precipitated and enriched,and gold bearing mylonite belt is formed.③ Factor analysis and cluster analysis show that Au is most closely related to Hg,and Hg can be used as an important indicator element for gold prospecting.The axial zoning sequence of the orebody from top to bottom is Mn→Ba→Ag→Zn→Au→Sb→Co→As→Ni→Mo→Bi→Cu→Hg,with the characteristics of "reverse zoning" and "coexistence of front and tail halos".④ Prediction and evaluation index of deep orebody (Hg×Au)P/(Ni×Bi)P is 1.87 at 100 m middle section,1.21 at 65 m elevation and 2.03 at -63 m elevation.This index has a "downward upward" trend from the middle to the tail of the orebody,indicating that there is a new blind orebody in the deep part of the mining area.According to the verification results of drilling engineering,it indicates that there is a good prospecting prospect in the deep part of the mining area.

Key words: gold deposit,deep prospecting,metallogenic model,primary halo zoning,prediction model of deep orebody