This paper demonstrates the use of airborne geophysics with the EQUATOR electromagnetic system to map paleovalleys and detect buried high resistivity granite massifs beneath low resistivity Neogene-Quaternary cover in the Republic of Buryatia. EQUATOR combines frequency domain and time domain measurements, enabling detailed investigation of the shallow section and detection of conductive targets to ∼400 m depth. A 2024 test survey at the Tetrakh deposit (Khiagda field) refined boundaries of lithological units, outlined radioactive granite bodies, and determined depths to the crystalline basement; paleovalleys act as natural traps for hydrogenic uranium mobilized by groundwater from weathered granitoids. An October 2025 survey at the Kupchinsky site produced resistivity maps and 1D inversions in time and frequency domains, reliably delineating the strong geoelectric contrast between low resistivity loose sediments and high resistivity granitoids. Interpreted maps identified paleovalley thalwegs and potentially uranium bearing paleovalleys, with a radioactive granite massif considered a likely uranium source. Comparison of EQUATOR profiles with a drilling line showed consistent mapping of the sediment-granite boundary. Drilling confirmed mineralization evidence (oxidative alteration, radioactivity halo, thin layers with increased uranium concentrations of 0.02%). The study concludes that EQUATOR AEM surveys significantly accelerate and improve hydrogenic uranium exploration.