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American Rare Earths reaches MREO milestone at Halleck Creek

1/28/2026 | United States | Australia

Mining

American Rare Earths produced MREO from Halleck Creek, advanced flowsheet and resource work, appointed a new CEO and prepared PFS, permits and drilling.

American Rare Earths produced Mixed Rare Earths Oxide (MREO) from Halleck Creek ore using an updated mineral processing flowsheet during the December 2025 quarter, marking a key technical milestone.

The MREO was generated by precipitating a mixed rare earth oxalate from a purified pregnant leach solution, then calcining the precipitate. Neutralisation testwork to remove impurities addressed historical challenges with allanite-hosted mineralisation and supported continuity in the hydrometallurgical program.

Beneficiation optimisation progressed alongside an updated preliminary flowsheet that incorporates recent testwork; further optimisation and evaluation are planned. An updated Mineral Resource Estimate for the Cowboy State Mine area reclassified 68.4 Mt into the indicated category, strengthening the geological basis for ongoing studies.

Corporate moves included the appointment of Mark Wall as CEO and an expanded partnership with Tetra Tech to pursue US government funding for mine-to-magnet capabilities. A University of Wyoming-led project will explore potential byproducts and applications from Halleck Creek extraction.

Near-term priorities for the March quarter are integrating metallurgical and beneficiation results into the prefeasibility study, planning demonstration plant options, continuing environmental and hydrological studies for permitting, and preparing 27 permitted infill drill holes.

Cash at December 31 was A$23.98 million, with A$2.4 million in listed financial assets; subsequent asset sales added further proceeds.
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American Rare Earths Limited

ARR
American Rare Earths Limited (ASX: ARR) is a Sydney-based mineral exploration and development company focused on advancing large-scale rare earth projects in the United States to establish a secure, domestic supply chain for critical minerals.
Australian Securities Exchange (ASX)

Recent Developments

2/10/2026

American Rare Earths Advances Halleck Creek Amid U.S. Policy Tailwinds

American Rare Earths Limited has reported key technical milestones at its Halleck Creek project, including rare earth oxide production and test mining, while targeting a 2026 Pre-Feasibility Study and mining permit submission. Mixed price reactions persist despite positive news, buoyed by rising rare earth prices and U.S. critical minerals support.

2/3/2026

American Rare Earths Advances Amid U.S. Policy Shifts

American Rare Earths Limited (ASX:ARR) sees positive momentum from technical milestones and U.S. trade policies, boosting market sentiment despite volatile trading, with analysts eyeing growth potential.

1/28/2026

American Rare Earths achieves MREO milestone at Halleck Creek

American Rare Earths produced MREO at Halleck Creek using an updated flowsheet, advanced resource modelling and strengthened finances for studies.

1/28/2026

American Rare Earths posts quarterly cash flow report

ASX-listed American Rare Earths filed its quarterly activities and Appendix 5B cash flow report; shares unchanged at A$0.475.

1/27/2026

American Rare Earths Advances Halleck Creek Amid U.S. Policy Boost

American Rare Earths Limited (ASX:ARR) has seen positive momentum from key project milestones at Halleck Creek, new leadership, and supportive U.S. trade policies, driving recent share price gains and heightened trading interest.