The Geological Characteristics Of Mineralization And Predietion Of Deep Minerlization On Dahuashan Gold Deposit In Southwest Henan Province

Dahuashan gold deposit is located in the gold polymetallic metallogenic belt on the north slope of the south qinling mountains.It belongs to the Maotang-Putang gold deposit in the west of Nanyang basin.It is located at the south of Maotang gold deposit and become the first medium-sized gold deposit in this area.K1 mineralization zone is developed in the brittle ductile fault zone of the dengying formation and has the characteristics of structural alteration rock mineralization.Mineralization zones are distributed in F4 bedding extrusion and crushing zones,which are strictly controlled by structural zones.The main mineralized belt in this area is the brown iron cap,which appears intermittently along the structural belt.Mineralized belt is most the breadth to amount to 50 m,a vein,total length of 1025 meters,270 ~ 280 °,steep slope.K2 mineralized belt from Laotian ?rock(graniteporphyry-cryptoexplosive breccia)and near the contact zone of surrounding rock,mainly breccia granite porphyry,breccia shatter surrounding rock,for concealed ore body,is the main copper gold ore bodies,ore body form of vein,lenticular,layered.Based on the study of regional geology and mine geology,this paper analyzes the relationship between ore-controlling structure and the spatial characteristics of ore body,analyzes the characteristics of geochemical primary halo data of ore body in K1 ore belt,and obtains the element combination of Au,As,Ag,Sb,Hg,Pb,Zn,W and Mo.Through the same data analysis of the exploration line 10,it is found that Zn,W,Pb,Ag,Hg,Sb,Au and As basically reflect the combination characteristics and metallogenic environment of main metallogenic elements and associated elements.Au,As and Sb represent the combination characteristics of metallogenic elements.The single element anomaly maps of the primary halo profile of the exploration line 10 have been drawn,and then the indicator element combination of the leading edge halo,near-ore halo and tail halo was determined: As and Sb had the leading edge indicating significance;Cu and Mo have trailing edge indicating significance;The abnormal distribution of Au elements is mostly flat and inclined,with a tendency of imbricate.Hg,Ag,Pb,Zn and W belong to the near-ore elements.At the same time,the characteristics of the axial zoning of the primary halo of the ore body were determined,that is,Au was enriched in the middle of the ore body,and the ore body presented the superposition phenomenon of the leading halo and the tail halo.In the shallow part,there were both the leading halo,the near halo and the tail halo elements,and the deep part also presented the leading halo elements.This also indicates that the ore bodies are superimposed with each other in multiple stages of mineralization,indicating that the depth may have certain prospecting potential.Three dimensional surface model,three dimensional borehole model and three dimensional ore body model were established in the mining area,and it was found that k1-1 ore body was closely related to the explosive breccia rock body in space,and there might be a good prospect of mineralization in the deep.Combined with the above work,the geological and primary halo-prospecting indicators are summarized: for the tectonic altered rock type ore bodies,the author mainly looks for the areas with strong hematitization and pyritization(pyritization)in the east-west dolomite fault belt of dg formation,namely,the mineralization(mineralization)bodies;For cryptoexplosive breccia type ore bodies,volcanic mechanisms are mainly searched,and the mineralization(mineralization)bodies are located at the center or edge where pyritization and chalcopyrite mineralization are strong.A better ore bearing area inside or near the yanshanian acidic intrusive rock mass in and around the mining area;The anomalies of Au,As,Sb,Hg,Ag and other elements with strong correlation with Au are important indicators of primary halos prospecting.When the main metallogenic elements are relatively enriched and the dizziness elements are strong and the tail halo elements are weak,it may indicate the existence of blind ore deep.Dizziness and tail halo indicator elements coexist abnormally in the ore body and lower part,which may indicate that the ore body extends down better.The prospecting direction of the mining area is pointed out.