Potential aquifer vulnerability in regions down-gradient from uranium in situ recovery (ISR) sites

Sandstone-hosted roll-front uranium ore deposits originate when U(VI) dissolved in groundwater is reduced and precipitated as insoluble U(IV) minerals. This study aims to evaluate the vulnerability of aquifers in regions located down-gradient from uranium in situ recovery (ISR) sites, which is crucial for assessing potential environmental and health risks associated with uranium contamination. A combination of geochemical analysis and hydrogeological modeling was employed to investigate the fate and transport of uranium and its impact on groundwater quality. Results reveal that the redox conditions and mineral composition of the subsurface significantly influence the mobility of uranium, with certain geological formations presenting higher vulnerabilities than others. Additionally, the study identifies key factors, including trace metal mobilization and groundwater monitoring practices, that need to be considered in the management of ISR sites. This research contributes valuable insights into the management of aquifers affected by uranium extraction processes and underscores the importance of thorough monitoring in preventing potential contamination of groundwater resources.