American Rare Earths Lifts Cowboy State Mine NPV to US$1.07B on Expanded Scale
Key Takeaways
- The 2026 Scoping Study estimates an after-tax NPV of approximately US$1.07 billion at an 8% real discount rate, up from US$558 million at 10% in the 2025 base case — though the different discount rates mean these are not directly comparable.
- Planned throughput rises 50% to 4.5 Mtpa, with average annual NdPr oxide production increasing 36% to approximately 2,500 tonnes and mine life extending from 20 to 26 years.
- NdPr oxide is projected to account for 87% of life-of-project revenue, making NdPr pricing and recovery the dominant drivers of project economics — a 30% reduction in either reduces after-tax NPV to approximately US$283 million.
- Initial capital has nearly doubled to US$900 million versus US$456 million in 2025, with no formal project financing process commenced and the Ex-Im Bank Letter of Interest remaining non-binding.
- Key near-term milestones include SRC sample transfer in December 2026, separated rare earth oxide production targeted for late Q2 2027, and ongoing work toward a potential Nasdaq listing via PCAOB audits and SEC S-K 1300 disclosure.
Updated Scoping Study delivers expanded vision for Cowboy State Mine
American Rare Earths is advancing the Halleck Creek Project in Wyoming as a potential domestic U.S. rare earth source, with Cowboy State Mine (CSM) representing the first development phase. An updated Scoping Study released on 30 September 2026 estimates an after-tax NPV of approximately US$1.07 billion at an 8% real discount rate, reflecting a substantially expanded project footprint compared with the 2025 base case.
Planned throughput rises 50% to 4.5 million tonnes per annum (Mtpa), with average annual neodymium-praseodymium (NdPr) oxide production increasing 36% to approximately 2,500 tonnes. The modelled mine life extends from 20 years to 26 years, establishing a larger initial development platform within the broader Halleck Creek resource.
Investors should note this is a preliminary assessment only. No Ore Reserves have been declared, and the production target is based entirely on Indicated Mineral Resources. Production targets and forecast financial outcomes are not guaranteed.
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How the 2026 study compares to the 2025 base case
The table below compares key parameters across both studies. Figures have been verified directly from the source announcement.
| Key Measure | 2025 Scoping Study | 2026 Scoping Study | Change |
|---|---|---|---|
| Planned ROM throughput | 3.0 Mtpa | 4.5 Mtpa | +50% |
| Modelled mine life | 20 years | 26 years | N/A |
| Average annual NdPr oxide production | ~1,833 tonnes | ~2,500 tonnes | +36% |
| After-tax NPV at 10% real | US$558M | US$764M | N/A |
| After-tax NPV at 8% real | Not used as headline base case | ~US$1.07B | N/A |
| After-tax IRR | 24% | 21% | N/A |
| Initial capital incl. contingency | US$456M | US$900M | N/A |
The 2026 base case uses an 8% real discount rate, compared with 10% in the 2025 headline case. NPVs at different discount rates are not directly comparable as a measure of value improvement. The higher capital reflects the expanded development scale and revised engineering estimates, not a like-for-like increase.
What’s inside the Halleck Creek resource and why NdPr matters
Neodymium-praseodymium (NdPr) oxide is often called the “magnet rare earth” — it is the critical input for permanent magnets used across a range of fast-growing industries. These are not niche applications; they sit at the intersection of decarbonisation and national security.
Key end-use sectors include:
- Defence and aerospace systems
- Electric vehicle drivetrains
- Wind power generation
- Robotics and advanced manufacturing
NdPr oxide is projected to account for approximately 87% of life-of-project revenue in the 2026 base case. That concentration of value in a single commodity makes NdPr pricing and recovery the dominant drivers of project economics — a point confirmed by the sensitivity analysis.
Why does domestic U.S. supply matter? China currently controls approximately two-thirds of global rare earth production and dominates refining capacity. Adamas Intelligence forecasts global magnet rare earth production will grow at a 7.8% CAGR versus demand of 8.4% CAGR through 2040, implying a structural supply deficit. For investors, that gap is exactly the commercial opportunity that projects like Halleck Creek are positioned to address.
Where Halleck Creek sits in the supply picture
The broader Halleck Creek project hosts a reported JORC Mineral Resource of approximately 2.63 billion tonnes at 3,292 ppm total rare earth oxides (TREO). Cowboy State Mine is the first phase only — the larger deposit extends well beyond the current study scope.
The project carries several location advantages: it sits on Wyoming State mineral leases, features near-surface open-pit mineralisation with a low life-of-mine strip ratio of 0.16:1, and benefits from proximity to regional highway, rail, natural gas, and power infrastructure.
Recovery optimisation and the path to metal
The 2026 study models a two-site processing concept. Comminution and concentration occur at the mine site, while a hydrometallurgical refinery is proposed near Wheatland or Laramie, Wyoming. The four saleable products modelled, and their recoveries, are:
- NdPr oxide — 58.2% recovery
- SEG mixed oxide — 25.8% recovery
- Terbium oxide — 28.7% recovery
- Dysprosium oxide — 12.4% recovery
Recoveries — particularly for the heavy rare earths — are lower in the 2026 study than in the 2025 study. The company acknowledges this explicitly, and the lower figures reflect a more conservative and realistic assessment rather than a negative development. Improving these recoveries is a central focus of ongoing test work.
Mark Wall, Chief Executive Officer, American Rare Earths
“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.”
On the downstream metallisation front, a 50 kg concentrate sample is currently being evaluated by Novex in the United States for oxide recovery and the pathway to NdPr metal production under an existing MoU. This work is developmental and does not yet establish commercial metal production.
Separately, a large sample is with Nagrom in Perth, with transfer to the Saskatchewan Research Council (SRC) in Canada scheduled for December 2026. That program targets improvements in NdPr and heavy rare earth recovery.
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Milestones ahead and what investors should watch
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.”
Key workstreams and milestones to track, drawn directly from the announcement:
- Pilot and demonstration program — separated rare earth oxide targeted for late Q2 2027
- Nagrom/SRC test work — sample transfer to SRC scheduled for December 2026 for additional recovery optimisation
- Novex oxide-to-metal program — advancing the 50 kg concentrate test program toward oxide recovery optimisation and NdPr metal production from Halleck Creek material
- Engineering and PFS — resolving key infrastructure, site configuration, capital, and operating cost trade-offs for the Pre-Feasibility Study
- Permitting — progressing the WDEQ Land Quality Division permit to mine application with WWC Engineering
- U.S. capital markets readiness — PCAOB audits and SEC S-K 1300 technical disclosure work advancing toward a potential Nasdaq listing
The financing picture deserves close attention. Initial capital of approximately US$900 million substantially exceeds the company’s current cash resources. ARR is evaluating a range of funding pathways including strategic investors, project debt, equity funding, government-supported programmes, and joint ventures. The previously announced non-binding Letter of Interest from the Export-Import Bank of the United States is not committed financing. No formal project financing process has commenced, and there can be no assurance that funding will be available when required or on acceptable terms.
ARR has also been actively managing its balance sheet in the lead-up to this development phase, completing a strategic asset sale of its Godolphin Resources shareholding in August 2026 to sharpen focus on the Halleck Creek project.
On sensitivity, the project is most exposed to NdPr pricing and recovery. A 30% reduction in either would reduce after-tax NPV to approximately US$283 million, while still returning a positive result above the 8% discount rate applied.
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