Energy Fuels Terbium Oxide Output Advances US Heavy Rare Earth Supply

Energy Fuels

Energy Fuels terbium oxide production marked an important step in rebuilding US heavy rare earth processing capacity. The company produced its first kilogram of 99.9% purity terbium oxide at its White Mesa Mill in Utah.

The pilot-scale output used monazite ore mined in Florida and Georgia. Energy Fuels said the high-purity terbium oxide met rare earth magnet manufacturer specifications.

Energy Fuels terbium oxide production is strategically significant because terbium remains one of the most supply-sensitive heavy rare earths. It is used in high-performance permanent magnets that support electric vehicles, wind turbines, defense systems, robotics, and advanced electronics.

White Mesa Mill Builds Heavy Rare Earth Processing Capability

The White Mesa Mill is becoming a key US platform for rare earth separation from monazite feedstock. Energy Fuels said the terbium oxide was the first US production from primary mineral feedstock in many decades.

The company has also produced dysprosium oxide at pilot scale at the same site. Since August, it has produced nearly 30kg of 99.9% pure dysprosium oxide.

Dysprosium and terbium are critical because they improve magnet performance under high-temperature and demanding operating conditions. This makes them especially important for advanced motors, defense technologies, and high-efficiency industrial systems.

Phase 2 Expansion Targets Commercial Rare Earth Oxide Output

Energy Fuels plans to expand heavy rare earth oxide production over the coming years. After completing its phase 2 circuit, the company expects capacity of 288t/yr of dysprosium oxide, 80t/yr of terbium oxide, and 6,000t/yr of neodymium-praseodymium oxide.

The phase 2 circuit could be completed as early as 2029. If achieved, the expansion would move Energy Fuels from pilot-scale production toward a more meaningful role in the US rare earth magnet supply chain.

Energy Fuels terbium oxide output also shows how domestic mineral feedstock, separation technology, and magnet-sector specifications must connect. The US rare earth strategy depends not only on mining, but also on producing separated oxides that downstream manufacturers can actually use.

The Metalnomist Commentary

Energy Fuels’ pilot terbium oxide output is small in volume but large in strategic meaning. The real test will be whether White Mesa can scale heavy rare earth separation into reliable commercial supply for magnet and defense customers.