STRUCTURAL SUPERIMPOSED HALOS AND DEEP PROSPECTING PREDICTION FOR No.13 VEIN IN HADAMENGOU GOLD DEPOSIT,INNER MONGOLIA

The No.13 ore-vein of the Hadamengou gold deposit is controlled by fault and characterized by primary halo superimposition of multi-phase and multistage.The metallogenic process can be divided into four stages.The mineralization,occurring mainly during the second and third stages,is geochemically related to metal sulfides.Based on the spatial distribution of ore-forming elements,their vertical zoning is recognized as the front halo(As-Sb-Hg),ore-body halo(Au-Ag-Cu-Pb-Zn-Bi) and rear halo(Ni-W-Co-Mo).The model of primary halo superimposition is established in the meantime.The veins consist of many rich orebodies in moniliform vertically.The front halo and rear halo coexist between the orebodies.The prospecting rules are summarized based on the structural superimposed halos.In the ore-bearing structural belts with low grade of gold,the coexistence of front and rear halos suggests orebodies in the deep.The multiple superimpositions of halos by abnormities of Cu,Pb and Zn indicate rich orebodies in the deep.The model of structural superimposed halos is applied to predict blind ore-bodies in the deep.The result is proved to be practical.