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    American Rare Earths’ Halleck Creek: byproduct and tailings value lens for engineers

    January 22, 2026|

    Reviewed by Joe Ashwell

    American Rare Earths’ Halleck Creek: byproduct and tailings value lens for engineers

    First reported on MINING.com

    30 Second Briefing

    American Rare Earths’ Halleck Creek project in Wyoming has secured a Seed Translational Acceleration of Research (STAR) award via the University of Wyoming’s NSF Accelerating Research Translation programme to study byproducts and tailings from rare earth extraction. The work, led by Tyler Brown at UW’s School of Energy Resources, will assess technical viability, processing requirements and end-use applications for these materials and their impact on project economics. Halleck Creek metallurgical tests have already upgraded ore from 0.34% to 3.72% TREO, removing 93.5% of non-rare earth material early so only 6.5% requires further refining.

    Technical Brief

    • Scope is confined to byproducts “associated with rare earth elements” at Halleck Creek, not broader regional deposits.

    Our Take

    The 10:1 upgrade ratio and removal of 93.5% non-rare earth material at Halleck Creek position American Rare Earths towards the lower end of the cost curve seen in our rare earths coverage, where many projects struggle to economically treat much lower head grades without similar early-rejection performance.

    Among the 48 keyword-matched rare earths pieces in our database, very few are tied to US inland regions like Wyoming, so this University of Wyoming/NSF-backed work signals that US domestic supply efforts are now extending beyond the more commonly cited coastal or Appalachian critical minerals hubs.

    The combination of an NSF-funded ART/STAR research framework with a project-scale asset like Halleck Creek is unusual in our mining research-tagged stories, and likely gives American Rare Earths a stronger case for future federal or state-level support tied to critical minerals and sustainability outcomes.

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    Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.

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