Environment Standards All operations are fully permitted and comply with rigorous U.S. federal and California environmental regulations, among the highest environmental standards in the world.

Clean, Safe Ore Body Mountain Pass’s primarily Bastnaesite ore contains significantly lower levels of radioactive thorium than most other deposits; monazite-rich bodies contain orders of magnitude higher thorium.

Dry Tailings Technology Our state-of-the-art dry-stacked tailings process eliminates the need for high-risk wet tailings ponds, enabling the recirculation of >90% of the process water and virtually eliminating the risk of groundwater contamination.

Closed-Loop, Zero-Discharge The dry-stacked tailings process allows our milling and beneficiation process to consume 1/20th of the fresh water of a comparably-sized facility, while our on-site Chlor-Alkali facility recycles our waste brine water from the separations facility and converts it into the chemical reagents needed for the separation process (via electrolysis powered by clean natural gas).