The project objective is to develop a process to extract an enriched, mixed rare earth element (REE) product from acid mine drainage (AMD) at the site of production, upstream of conventional AMD treatment. Two AMD cases— net acid and net alkaline (Cases A and B, respectively)—will be explored. The products will be processed through an acid leaching/solvent extraction (ALSX) plant to compare performance with ongoing ALSX trials using conventional AMD sludge feedstock. The project team will evaluate the benefits of separating REEs from the AMD stream under reducing conditions such that iron and manganese will remain in their reduced (Fe²⁺, Mn²⁺) states. As reduced species, they will bypass the REE extraction process, improving overall process economics. In Case A, the pH is raised to just pH 4, which will precipitate REEs but not Al, Fe²⁺, or Mn²⁺, metals that would otherwise need to be separated to achieve high REE purities. In Case B, the team will explore the application of an electrochemically stimulated supported liquid membrane strategy to separate REEs from ferrous ion.