The uranium mineralization in the Wushijiazi volcanic basin enjoys a superior geological conditions. The uranium mineralization anomalies have been found on the surface, and they are of altered and fractured zone type. To identify the extension changes of ore-controlling fracture along the strike and dip as well as the favorable enrichment of uranium orebody, the authors carried out deep exploration. The joint detection of radon gas and CSAMT (Controlled Source Audiofrequency Magnetotelluric) was adopted in the study area where uranium mineralization is densely concentrated. The major structure and characteristics of ore-controlling fracture were identified, and six uranium mineralization favorable places were predicted, among which two places were drilled to verify, and industrial uranium orebodies were found in these two places. It is shown that the joint detection of radon gas and CSAMT is significantly effective in the search for concealed faults and fractures and blind orebodies; it can be adopted in the prospecting work of the uranium deposit with a major ore-controlling factor of fault structure, and can provide the future uranium deposit prospecting work with some ideas and directions, so as to accelerate uranium deposit prospecting work.
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