U.S. Rare Earth Breakthrough: Halleck Creek Achieves 97% Purity, Reducing Reliance on China
August 15, 2025
Recent results demonstrate that high-purity rare earth oxides can be produced from Halleck Creek's allanite ore, offering a promising alternative separation process, although the biotech flowsheet remains at laboratory research stage.
The SynBREE consortium, led by Lawrence Livermore National Laboratory, successfully produced 97.1% pure Heavy Rare Earth Oxide (HREO) and 96.4% pure Light Rare Earth Oxide (LREO) from Halleck Creek ore, marking a significant milestone.
These findings validate the potential for Halleck Creek to produce commercially viable rare earth oxides domestically, reducing U.S. dependence on imports, particularly from China.
American Rare Earths aims to develop a domestic supply chain for critical rare earth elements, reducing reliance on imports and supporting U.S. strategic industries.
The company continues to optimize mineral processing techniques and explore innovative technologies to enhance production efficiency and develop a cost-effective, environmentally responsible U.S.-based rare earth industry.
ARR has achieved an 82% overall rare earth recovery rate, with plans to improve processing through atmospheric tank leaching, and is moving toward test mining and equipment orders for a demonstration plant.
Upcoming milestones include completing processing studies, publishing a prefeasibility report, and securing permits, with the project progressing toward commercialization.
Shares of American Rare Earths increased by 4% on the ASX, reflecting investor confidence as the company advances its processing, studies, and permit applications for the Cowboy State Mine.
The company is continuing to optimize mineral processing techniques to improve efficiency and output.
The development is part of the US Department of Defense’s DARPA EMBER initiative, which aims to develop biotechnology-based methods for separating and purifying rare earth elements.
Research supports the development of a biotechnology-based flow sheet as an alternative to conventional mineral processing methods.
Halleck Creek is one of the largest U.S. rare earth projects by tonnage, with resource estimates supporting its potential as a domestic source amid rising demand for electric vehicles, wind turbines, and advanced tech.
Summary based on 6 sources
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Sources

Wyoming Rare (USA) Inc. • Aug 15, 2025
American Rare Earths Announces SynBREE Consortium Produces Heavy & Light Rare Earths Oxide Concentrates using Halleck Creek Ore
The Northern Miner • Aug 15, 2025
American Rare Earths produces first Wyoming oxides - The Northern Miner