US-based critical minerals refiner ReElement Technologies and strategic metals producer Principal Mineral signed a memorandum of understanding to collaborate on integrating midstream rare earth production at a US facility. The two companies aim to consolidate "separation, fluoride production, and metallization" into a single process within one facility, striving to enhance production and minimize waste. The specific location remains undetermined, but both companies are evaluating ReElement's plant in Marion, Indiana, Principal's facility in Camden, South Carolina, among other potential sites. The facility's operations will involve ReElement's rare earth products sourced from mines and recycled materials, while Principal will produce rare earth fluorides and metals.