The Koktokay in Xinjiang is a famous pegmatitic- type rare metal deposit. The genesis of the pegmatites has been controversial, and the rare- metal resources have been exhausted for many years. Hence, breakthroughs are urgently needed in both theory and prospecting. In this study, we conducted geological and geochemical research on the Middle Ordovician metamorphic rocks of Habahe Group and Triassic rare- metal granites in the mining area, as well as remote sensing data interpretation, geophysical investigation, and hidden ore prediction. The metamorphic rocks of the Habahe Group are mainly composed of mica schist. Their trace element contents are similar to that of the continental crust. It is impossible to directly form mineralizing magma through partial melting of these metamorphic rocks. The Triassic rare- metal granite mainly consists of muscovite albite granite with minor albite granite, which originated from a deep magma chamber. During the upward migration process, the magma underwent crystallization and flow differentiation to form volatile- rich, highly differentiated magmas, and then intruded locally to form rare- metal granite branches. There is a granite- pegmatite system at Koktokay. Various remote sensing data interpretation results show several ring images in the Koktokay area which could indicate the ring structures at depth. The pegmatites and rare- metal granites occurred in these ring structures, indicating that the host magmatic activity at Koktogay is likely associated with the ring structures. The magnetotelluric (MT) shows that there are low- resistivity anomalous bodies below 15 km at depth, which could be a residual magma chamber or melting zone where the granite magma derived. The audio- frequency magnetotelluric (AMT) shows significant low- resistivity anomalous bodies occur at depth. Based on these results of the geological, remote sensing, and geophysical research, we predict that there might be fault- magma channels in depth of ring- shaped structures, where granitic magma and related rare metal orebodies could be developed.