American Rare Earths Details US$1.07B NPV Study for Wyoming Rare Earth Mine
Key Takeaways
- The 2026 Cowboy State Mine scoping study returns an after-tax NPV of approximately US$1.07 billion at an 8% real discount rate — up from US$558 million in the 2025 study, though the two figures use different discount rates and are not directly comparable.
- Planned throughput increases 50% to 4.5 Mtpa and mine life extends from 20 to 26 years, with average annual NdPr oxide production rising 36% to approximately 2,500 tonnes.
- Initial capital has nearly doubled to US$900 million — including a 30% contingency of approximately US$210 million — materially exceeding the company's current cash resources, with no formal financing process yet commenced.
- Heavy rare earth recoveries have fallen sharply versus the 2025 base case, with dysprosium dropping from 66.5% to 12.4% and terbium from 70.2% to 28.7%, making recovery improvement the single most critical technical workstream ahead of the Pre-Feasibility Study.
- NdPr recovery and NdPr price are tied as the most influential variables on project NPV, each driving a spread of approximately US$1.565 billion across the tested sensitivity range — underscoring how much the economics hinge on a single commodity and a single process outcome.
Cowboy State Mine scoping study delivers US$1.07 billion NPV and expanded production platform
American Rare Earths (ASX: ARR) has released an updated Scoping Study for Cowboy State Mine (CSM), the first development phase of its Halleck Creek rare earth project in Wyoming, returning an estimated after-tax net present value (NPV) of approximately US$1.07 billion at an 8% real discount rate.
The study evaluates a significantly larger operation than the 2025 base case: planned throughput up 50% to 4.5 million tonnes per annum (Mtpa), average annual neodymium-praseodymium (NdPr) oxide production up 36% to approximately 2,500 tonnes, and a mine life extended from 20 to 26 years. Halleck Creek hosts a reported JORC Mineral Resource of approximately 2.63 billion tonnes at 3,292 ppm total rare earth oxides (TREO), with CSM representing the first development phase only.
Important disclosure: This is a Scoping Study, not a Pre-Feasibility Study or Feasibility Study. No Ore Reserves have been declared. The production target is based entirely on Indicated Mineral Resources. There is no certainty that the production targets or forecast financial outcomes will be realised. Investors should not make investment decisions based solely on its results.
Mark Wall, Chief Executive Officer, American Rare Earths
“Our ambition is to turn Halleck Creek’s resource scale into a long term source of rare earth materials for American industry. This study gives investors a clearer view of the first development phase and the work that is moving it forward.
“We are now evaluating a mine with 50% greater processing capacity, 36% more annual NdPr oxide production and a longer operating life than the 2025 base case. That is a substantial platform from which to advance the project.
“Just as important is the work beyond the study. We are testing how to recover more value from the ore, refining the infrastructure and processing configuration, and working with Novex on the pathway from oxide to metal. Our focus is on the decisions that can improve the project before major capital is committed.
“We see an opportunity for Halleck Creek to become a significant domestic source of rare earth materials. Our job now is to advance the technical, permitting and funding work needed to turn that opportunity into a development decision.”
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How the 2026 study compares to the 2025 base case
The 2026 update reflects a materially expanded development concept across nearly every key metric.
| Metric | 2025 Scoping Study Base Case | 2026 Scoping Study Base Case |
|---|---|---|
| Planned ROM throughput | 3.0 Mtpa | 4.5 Mtpa |
| Modelled mine life | 20 years | 26 years |
| Avg. annual NdPr oxide production | ~1,833 tonnes | ~2,500 tonnes |
| After-tax NPV at 10% real | US$558 million | US$764 million |
| After-tax NPV at 8% real | Not used as headline | ~US$1.07 billion |
| After-tax IRR | 24% | 21% |
| Initial capital (incl. contingency) | US$456 million | US$900 million |
| NdPr oxide price assumption | US$91/kg | US$151/kg |
A critical framing note: the 2026 headline NPV uses an 8% real discount rate, versus 10% in the 2025 study. These are not directly comparable measures of value improvement. The announcement itself flags this distinction, and the change in discount rate alone accounts for a meaningful portion of the NPV difference. The updated case also changes processing scale, mine life, product pricing, recoveries, and capital costs.
Three investor-relevant changes stand out from the updated study:
- 50% more processing capacity, expanding the annual throughput base from 3.0 to 4.5 Mtpa
- Six-year longer operating life, extending the mine plan from 20 to 26 years
- Higher contingency (30% vs. 20%), reflecting more detailed engineering and updated cost rigour
Understanding rare earths and why NdPr matters
Rare earth elements (REEs) are a group of 17 metals with unique magnetic and electronic properties that make them essential in high-technology manufacturing. Neodymium and praseodymium — together abbreviated as NdPr — are the critical inputs for NdFeB permanent magnets (neodymium-iron-boron), the strongest commercially available magnet type.
These magnets sit inside the electric motors of EVs and hybrid vehicles, the generators of wind turbines, industrial robotics, and a wide range of defence and aerospace systems. As demand for all of these grows, so does pressure on NdPr supply.
The supply challenge is significant. China accounts for approximately 80% of global NdPr mine production and roughly 90% of rare earth refining capacity, meaning the U.S. currently has very limited domestic separation capability. That concentration has prompted substantial government interest in building out non-Chinese supply chains, particularly in the United States.
Halleck Creek sits squarely in that policy tailwind. The project is located on Wyoming State land, benefits from near-surface mineralisation and a low strip ratio, and has attracted a non-binding Letter of Interest from the U.S. Export-Import Bank (EXIM). That Letter of Interest is not committed financing and remains subject to further evaluation, due diligence, and approvals.
The strategic relevance is anchored in one key number: NdPr oxide is expected to contribute approximately 87% of life-of-project revenue in the base case. The project’s economic case rises and falls primarily on NdPr pricing and recovery.
ARR is also evaluating the next step in the supply chain through its work with Novex. A 50 kg concentrate sample is currently with Novex for recovery optimisation and a programme intended to progress toward NdPr metal production. This work is developmental and does not yet establish commercial metal production.
Recovery work and the path to prefeasibility
What the test work is targeting
One of the most important transparency points in the 2026 study is that product recoveries have declined compared to the 2025 base case, particularly for the heavy rare earths. These reductions are material and are the primary focus of ongoing test work.
Recovery rates by product:
- NdPr oxide: 63.9% (2025) → 58.2% (2026)
- Terbium oxide: 70.2% (2025) → 28.7% (2026)
- Dysprosium oxide: 66.5% (2025) → 12.4% (2026)
- SEG product (samarium, europium, gadolinium): 70.1% (2025) → 25.8% (2026)
The sensitivity analysis makes clear why NdPr recovery matters so much: it is tied with NdPr price as the single most influential variable on project NPV, each driving a spread of approximately US$1.565 billion across the tested range of -30% to +30%. Potential recovery improvements remain subject to test results and further assessment; they should not be treated as established project outcomes.
Next milestones
The Pre-Feasibility Study (PFS) remains in progress. Key workstreams currently advancing include:
- Pilot and demonstration programme: NdPr and heavy rare earth recovery confirmation, with separated rare earth oxide targeted for late Q2 2027
- Nagrom and Saskatchewan Research Council (SRC): Sample transfer to SRC in December 2026 for additional recovery optimisation
- Novex oxide-to-metal programme: Advancing the 50 kg concentrate toward NdPr metal production
- Engineering and study progression: Resolving infrastructure, site configuration, and capital trade-offs for the PFS, while advancing suitable Feasibility Study work in parallel
- Permitting: Progressing the WDEQ Land Quality Division permit-to-mine application with WWC Engineering, along with hydrology and hydrogeology work
- U.S. capital markets readiness: PCAOB audits and SEC Regulation S-K Subpart 1300 technical disclosure work underway in support of a potential Nasdaq listing pathway
Andrew Conover, Chief Development Officer, American Rare Earths
“The most valuable decisions are often made before the feasibility study starts. Our focus is on getting the recovery assumptions, plant configuration, infrastructure and execution plan right while those choices can still materially improve project outcomes with minimal additional cost.
We are working through those decisions in the PFS and advancing suitable feasibility work in parallel. The objective is a better defined project with appropriate trade-offs considered, and a disciplined pathway towards a development decision.”
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Capital requirements and funding pathway
Initial capital is estimated at approximately US$900 million, comprising roughly US$690 million of direct capital and approximately US$210 million of contingency (30% of direct capital). This materially exceeds the Company’s current cash resources.
Funding options under consideration include:
- Strategic investors
- Project debt and equity financing
- Government-supported programmes
- Joint venture arrangements
- The non-binding Letter of Interest from the U.S. Export-Import Bank (EXIM), which is not committed financing
No formal project financing process has commenced. There can be no assurance that funding will be available when required or on acceptable terms. Equity financing may dilute existing shareholders. Joint ventures or other funding arrangements may reduce ARR’s ownership interest or economic exposure to the project.
On the Nasdaq pathway: the 2026 JORC Scoping Study shares its underlying technical basis with the parallel SEC Regulation S-K Subpart 1300 Initial Assessment prepared to support a potential Nasdaq listing. The two reports use different standards and are not interchangeable. Listing readiness does not constitute approval of a listing or assurance of project funding.
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