Abstract: An audio-frequency magnetotellurics (AMT) study has been carried out in the exploration of hard rock-hosted uranium deposits in Huayangchuan area, Shaanxi Province. The results show that the effects of Hz in AMT is significant in restraining the occurrence of structural fractures. Also AMT can effectively detect the scale and occurrence of tectonic-fractured zones and the distribution of rock masses on both sides. Therefore, it is an effective technical means in exploration and peripheral exploration of hard rock type uranium deposits.

Key words: AMT, hard rock-hosted uranium deposit, tectonic fracture zone