Abstract: In the past， it was generally believed that the mineralization of gold polymetallic deposits in Xiong'er Mountain ore concentration area was mainly controlled by the regional Machaoying fault and its NE and NW trending secondary faults. And its NE trending secondary faults often have the characteristics of equidistant distribution. Under the guidance of this understanding， great achievements have been made in gold polymetallic deposits prospecting in this area. In recent years， although the Huaishuping，Shiyaogou and other gold and molybdenum deposits have been newly discovered， the overall prospecting progress is not great，and there is no great breakthrough in the understanding of mineralization. Through the geological survey projects of China Geological Survey， a series of new understandings have been obtained in gold polymetallic mineralization and prospecting in Xiong'er Mountain ore concentration area: ①The unconformity plane between the Xiong'er Group and the Taihua Group is the main controlling structure of gold polymetallic deposits in Xiong'er Mountain ore concentration area， which controls the spatial distribution of gold polymetallic ore fields （deposits） in the area； ②The palaeovolcanicities of the Xiongerian played an important role in controlling the gold polymetallic mineralization in the area. The deposits （or ore occurrence） in the volcanic strata of the Jidanping Formation are hosted in different levels of paleovolcanic structures， which should be volcanic rock type gold deposits； ③The formation of K-feldspar quartz vein type molybdenum deposits may also be related to paleovolcanism of the Xiongerian； ④The "lithoscaps" or "silicified zone" widely existing in the Xiong'er Mountain ore concentration area has indicative significance for deep mineralization. It is suggested that in-depth mineralogical， petrological and metallogenic studies should be carried out so as to achieve a major breakthrough in deep prospecting.It is holds that the next step of prospecting and exploration should mainly focus on these two ore controlling structures. There are a large number of silicified belts or silicon caps in the area， which may be the manifestation of alkali metasomatism in the shallow part. These silicified belts or silicon caps indicate the existence of large alkali metasomatic bodies in the deep， so they should be used as an indicator for the next exploration.

Key words: deep prospecting, unconformity plane, paleovolcanic structure, volcanic rock-type gold deposit, silicon cap, ore concentration area, Xiong'er Mountain