GEOCHEMICAL FEATURES AND PREDICTION OF THE DEEP-SEATED ORE BODIES IN THE DONGFENG GOLD DEPOSIT,INNER MONGOLIA

The Dongfeng gold deposit is located in a local rise in the Laohahe depression in the middle of the Chifeng Chaoyang gold metallogenic province at the northern margin of the North China Platform. The deposit belongs to low sulphide altered rock type. In the lodes, the high value of Hg,Ba,As,Sb,(As+Hg)/(Mo+Pb),100(Hg/Mo) and F 2 factor and the low value of Mo,Co,Ni and F 1 factor mark the upper or front part of an ore body. In contrast, mark the low part or the tail of an ore body. Based on the geochemical indications mentioned, in No.8 lode, a new ore body should occur at the deep location under the 10th level between 63 800～64 200 lines whereas at 63 700 line, the new ore bodies should occur at the 6th and 7th levels. Commercial gold mineralization could also be found under the 3rd level at 64000 line in No.2 lode. However, the scale of the new ore bodies to be found should very small for limited structural conditions.