Abstract:Jiaojia type gold deposithas have made great breakthroughs in the depth of 500~2000m underground prospecting in recent years. It has great prospecting potential in the deep. However, whether there is still ore prospecting space in the deep, where is the ore prospecting space are key scientific problems that restrict the deep ore prospecting at present. Choosing three super giant gold deposits of 1000t as the research objects, they are Sanshandao gold deposit, Jiaojia gold deposit and TaishangShuiwangzhuang gold deposit, basing on the analysis of previous methods of quantitatively calculation, using structural characteristics, magmatism and geothermal gradient to constrain the metallogenic depth, structural characterisiics have been analyzed. It is showed that the mineralization of Jiaojia type gold deposit occurred in the ductile and brittle transition space to the brittle space, and the metallogenic depth is about less than 5~10km. As showed by the study of magmatism, the emplacement depth of Linglong granite is 10~15km, and Guojialing granodiorite is 6~13km. The magmatic hydrothermal dissolution depth is less than 12km, and the metallogenic depth is less than 10km. As showed by the calculation results of oreforming temperature and geothermal gradient, the metallogenic depth is about 2.5 ~ 9.5km. Although there has been slight denudation after the mineralization, the overall denudation is not large, and the deep ore bodies are well preserved. The deep ore bodies and the shallow ore bodies are distributed along the same orecontrolling fault, withing obvious lateral trending. The high value area with thickness times grade along the lateral direction has the distribution law of similar equal distance. It still has a prospecting space of 2~4km in deep. It has a good prospecting prospect along the lateral direction and according to the interval of high thickness times grade value zone to deep part in Jiaojia type gold deposits.
