Abstract:To improve the efficiency of in-situ leaching uranium mining in sandstone-type deposits, it is crucial to understand the leaching agent"s migration range within the ore-bearing layer. Currently, uranium mines lack efficient observation methods for this purpose. The primary component of acid leaching agents is sulfuric acid, with a concentration as high as 15 g/L, significantly altering the groundwater resistivity within the ore-bearing layer. Electrical prospecting, which is sensitive to changes in underground resistivity, offers a potential method for observing leaching agent migration. This paper investigates the use of dipole-dipole, Wenner, and Schlumberger high-density resistivity configurations to detect the regions of electrical anomalies caused by sulfuric acid migration, using a uranium mine in Inner Mongolia, China, as a case study. Numerical simulations demonstrate that all three configurations can detect apparent resistivity responses at depths of 100 meters due to leaching agent migration. Among them, the dipole-dipole configuration performs best in terms of observation and delineation, with inversion results accurately defining the boundaries of the electrical anomaly regions. After 60 days, the inversion low-resistivity anomaly area closely matches the leaching area at the corresponding time. The sensitivity of well line observation devices to changes in underground resistivity is higher than that of pure surface line observation methods, but the cost is also higher.