Halleck Creek Resource Expands to 2.63 Billion Tonnes with Higher Grades
American Rare Earths (ARRNF) announced a significant update to its Halleck Creek Rare Earth Project in Wyoming. The total mineral resource estimate increased by 12.2% to 2.63 billion tonnes at 3,926 ppm Total Rare Earth Oxides (TREO). The Red Mountain Area saw a 29.7% growth in resources to 1.24 billion tonnes, with an 8.3% grade increase to 3,252 ppm TREO.
The Cowboy State Mine, representing the first phase of development, expanded by 29.4% to 543 million tonnes, with a 2.7% increase in TREO grade to 3,438 ppm. The deposit remains open at depth and along strike, with the current estimate covering only 16% of the project area. The company plans to release an updated Scoping Study in February 2025, followed by a Pre-Feasibility Study later in the year.
American Rare Earths (ARRNF) ha annunciato un aggiornamento significativo per il suo progetto Halleck Creek Rare Earth nel Wyoming. La stima totale delle risorse minerarie è aumentata del 12,2% raggiungendo 2,63 miliardi di tonnellate a 3.926 ppm di ossidi totali di terre rare (TREO). L'area di Red Mountain ha registrato una crescita del 29,7% delle risorse, arrivando a 1,24 miliardi di tonnellate, con un incremento del grado dell'8,3% a 3.252 ppm di TREO.
La Cowboy State Mine, rappresentando la prima fase di sviluppo, è aumentata del 29,4% fino a 543 milioni di tonnellate, con un incremento del grado di TREO del 2,7% a 3.438 ppm. Il deposito rimane aperto in profondità e lungo il strike, con l'attuale stima che copre solo il 16% dell'area del progetto. L'azienda prevede di rilasciare uno studio di scoping aggiornato a febbraio 2025, seguito da uno studio di pre-fattibilità più tardi nel corso dell'anno.
American Rare Earths (ARRNF) anunció una actualización significativa de su proyecto Halleck Creek Rare Earth en Wyoming. La estimación total de recursos minerales se incrementó en 12,2% alcanzando 2,63 mil millones de toneladas a 3,926 ppm de óxidos totales de tierras raras (TREO). El área de Red Mountain vio un crecimiento del 29,7% en recursos hasta 1,24 mil millones de toneladas, con un aumento en la ley del 8,3% a 3,252 ppm de TREO.
La Cowboy State Mine, que representa la primera fase de desarrollo, se expandió en 29,4% hasta 543 millones de toneladas, con un aumento del 2,7% en la ley de TREO a 3,438 ppm. El depósito continúa abierto en profundidad y a lo largo del strike, con la estimación actual cubriendo solo el 16% del área del proyecto. La empresa planea lanzar un estudio de escopo actualizado en febrero de 2025, seguido de un estudio de previabilidad más tarde en el año.
American Rare Earths (ARRNF)는 와이오밍에 있는 Halleck Creek 희토류 프로젝트에 대한 중요한 업데이트를 발표했습니다. 전체 광물 자원 추정치는 12.2% 증가하여 26.3억 톤에 이르렀으며, 총 희토류 산화물(TREO)의 농도는 3,926 ppm 입니다. Red Mountain 지역에서는 자원이 29.7% 성장하여 12.4억 톤이 되었고, TREO의 농도가 8.3% 증가하여 3,252 ppm로 증가했습니다.
개발의 첫 번째 단계인 Cowboy State Mine는 29.4% 확대되어 5.43억 톤에 이르렀으며, TREO의 농도는 2.7% 증가하여 3,438 ppm입니다. 이 매장지는 깊이와 방향까지 열려 있으며, 현재 추정치는 프로젝트 영역의 16%만을 커버하고 있습니다. 회사는 2025년 2월에 업데이트된 스코핑 연구를 발표할 계획이며, 그해 후반에는 예비 타당성 연구를 이어갈 예정입니다.
American Rare Earths (ARRNF) a annoncé une mise à jour significative de son projet Halleck Creek Rare Earth dans le Wyoming. L'estimation totale des ressources minérales a augmenté de 12,2% pour atteindre 2,63 milliards de tonnes avec un taux de 3,926 ppm d'oxydes de terres rares totaux (TREO). La zone de Red Mountain a connu une croissance de 29,7% des ressources à 1,24 milliard de tonnes, avec une augmentation de la teneur de 8,3% à 3,252 ppm de TREO.
La mine Cowboy State, représentant la première phase de développement, s'est agrandie de 29,4% pour atteindre 543 millions de tonnes, avec une hausse de 2,7% de la teneur en TREO à 3,438 ppm. Le gisement reste ouvert en profondeur et le long du strike, l'estimation actuelle ne couvrant que 16% de la zone du projet. L'entreprise prévoit de publier une étude de cadrage mise à jour en février 2025, suivie d'une étude de faisabilité ultérieure dans l'année.
American Rare Earths (ARRNF) hat ein bedeutendes Update zu seinem Halleck Creek Rare Earth Projekt in Wyoming angekündigt. Die Gesamtschätzung der mineralischen Ressourcen stieg um 12,2% auf 2,63 Milliarden Tonnen bei 3.926 ppm Gesamtgehalte an seltenen Erden (TREO). Im Red Mountain Gebiet gab es ein Wachstum von 29,7% der Ressourcen auf 1,24 Milliarden Tonnen, mit einer Erhöhung des Gehalts um 8,3% auf 3.252 ppm TREO.
Die Cowboy State Mine, die die erste Entwicklungsphase darstellt, erweiterte sich um 29,4% auf 543 Millionen Tonnen, mit einer Erhöhung des TREO-Gehalts um 2,7% auf 3.438 ppm. Das Vorkommen bleibt in der Tiefe und entlang des Streiks offen, wobei die aktuelle Schätzung nur 16% der Projektfläche abdeckt. Das Unternehmen plant, im Februar 2025 eine aktualisierte Scoping-Studie zu veröffentlichen, gefolgt von einer Voruntersuchung später im Jahr.
- Total mineral resource increased 12.2% to 2.63 billion tonnes
- Red Mountain Area resources grew 29.7% to 1.24 billion tonnes
- Cowboy State Mine expanded 29.4% to 543 million tonnes
- Current estimate covers only 16% of project area, indicating significant growth potential
- 90% of waste material can be removed through gravity and magnetic separation
- None.
Wyoming Rare Earth Project Positioned to Meet U.S. Critical Mineral Needs
Highlights
- Halleck Creek Total Mineral Resource Estimate increased by
12.2% to 2.63 billion tonnes at 3,926 ppm Total Rare Earth Oxides (TREO). - Red Mountain Area within Halleck Creek saw a
29.7% growth in resources, increasing to 1.24 billion tonnes, with an8.3% uplift in grade to 3,252 ppm TREO. - Cowboy State Mine, representing the first phase of project development within Red Mountain, grew by
29.4% to 543 million tonnes, with a2.7% increase in TREO grade to 3,438 ppm. - The deposit remains open at depth and along strike, offering significant upside potential, with the mineral resource estimate covering approximately
16% of the greater Halleck Creek project surface area.
DENVER, Jan. 29, 2025 (GLOBE NEWSWIRE) -- American Rare Earths (ASX: ARR | OTCQX: ARRNF | ADR: AMRRY) ("ARR" or "the Company") and its wholly owned subsidiary Wyoming Rare (USA) Inc. ("WRI") are pleased to announce a major milestone resource update for the Halleck Creek Rare Earth Project in Wyoming. The updated JORC-compliant Mineral Resource Estimates (MRE) further establish Halleck Creek as one of the largest rare earth deposits in North America and underscore ARR’s continued progress in unlocking its potential as a strategic U.S. asset.
The Halleck Creek resource now exceeds 2.63 billion tonnes, representing a significant
The Cowboy State Mine, located within the Red Mountain area, continues to deliver robust resource growth and remains central to ARR’s development strategy. Its location on Wyoming State land provides a streamlined permitting process, accelerating ARR’s ability to unlock the project’s full value. The project’s favorable geology and near-surface mineralization support the potential for a low-cost open-pit mining operation, while ongoing metallurgical test work continues to demonstrate the potential for efficient processing of rare earths. These results reinforce ARR’s ability to support the U.S. government’s efforts to secure domestic critical mineral independence, reducing reliance on imports and supporting economic growth and national security objectives.
Chris Gibbs, CEO of American Rare Earths, commented:
"This resource update demonstrates the continued growth, scale, and strategic importance of Halleck Creek as a cornerstone project for the U.S. rare earth supply chain. With the deposit still open at depth, and along strike, the upside potential is truly remarkable. With the Halleck Creek mineral resource estimate covering approximately
“The expanded resources will strengthen the project's economics as we finalize the updated Scoping Study, which is set for release shortly, and continue integrating this data into the Pre-Feasibility Study, scheduled for completion later this year. Halleck Creek is positioned to become one of the most significant rare earth assets in North America, supporting U.S. critical mineral independence and economic growth.”
Next Steps and Path Forward
The updated resource model and mine plans will have a positive impact on Halleck Creek’s project economics, further enhancing its strategic importance. ARR is currently integrating the updated resource and high-grade data into the Scoping Study, which was originally released in March 2024. The updated study is nearing completion and will be released in February 2025.
In parallel, ongoing metallurgical test work continues to deliver promising results, highlighting the potential for cost-efficient processing at Halleck Creek. As outlined in the 2024 Scoping Study, approximately
In addition, the updated resource estimates will be incorporated into the ongoing Pre-Feasibility Study (PFS), which remains on track for completion later this year. The PFS will provide a more detailed evaluation of Halleck Creek’s technical and economic potential, supporting ARR’s phased approach to development and commercial production.
Table 1 – Mineral Resource Estimate at Halleck Creek (1000ppm TREO cut off)
| Classification | Tonnage | Grade | Contained Material | ||||||
| TREO | LREO | HREO | MREO | TREO | LREO | HREO | MREO | ||
| t | ppm | ppm | ppm | ppm | t | t | t | t | |
| Measured | 206,716,068 | 3,720 | 3,352 | 370 | 904 | 769,018 | 692,935 | 76,550 | 186,836 |
| Indicated | 1,272,604,372 | 3,271 | 2,900 | 360 | 852 | 4,162,386 | 3,689,999 | 458,140 | 1,084,256 |
| Meas + Ind | 1,479,320,439 | 3,334 | 2,963 | 361 | 859 | 4,931,405 | 4,382,934 | 534,691 | 1,271,092 |
| Inferred | 1,147,180,795 | 3,239 | 2,878 | 361 | 837 | 3,715,661 | 3,302,005 | 413,651 | 960,355 |
| Total | 2,626,501,234 | 3,292 | 2,926 | 361 | 850 | 8,647,066 | 7,684,939 | 948,341 | 2,231,447 |
This announcement is authorized for release by the Board of American Rare Earths.
For the full technical report see here.
About American Rare Earths Limited:
American Rare Earths (ASX: ARR | OTCQX: ARRNF | ADR: AMRRY) is a critical minerals company at the forefront of reshaping the U.S. rare earths industry. Through its wholly owned subsidiary, Wyoming Rare (USA) Inc., the company is advancing the Halleck Creek Project in Wyoming—a world-class rare earth deposit with the potential to secure America’s critical mineral independence for generations. The Halleck Creek Project boasts a JORC-compliant resource of 2.63 billion tonnes, representing approximately
With plans for onsite mineral processing and separation facilities, Halleck Creek is strategically positioned to reduce U.S. reliance on imports—predominantly from China—while meeting the growing demand for rare earth elements essential to defense, advanced technologies, and economic security. As exploration progresses, the project’s untapped potential on both State and Federal lands further reinforces its significance as a cornerstone of U.S. supply chain security. In addition to its resource potential, American Rare Earths is committed to environmentally responsible mining practices and continues to collaborate with U.S. Government-supported R&D programs to develop innovative extraction and processing technologies for rare earth elements.
The opportunities ahead for Halleck Creek are transformational, positioning it as a multi-generational resource that aligns with U.S. national priorities for critical mineral independence.
For additional information
Media Contact:
Susan Assadi
sassadi@americanree.com
347 977 7125
Investor Relations US Contact:
Beverly Jedynak
Beverly.jedynak@viriathus.com
312 943 1123
FAQ
What is the new total mineral resource estimate for ARRNF's Halleck Creek project?
How much did the Red Mountain Area resources grow in the latest ARRNF update?
When will ARRNF release the updated Halleck Creek Scoping Study?
What percentage of the Halleck Creek project area is covered by the current resource estimate?
What is the waste removal efficiency in ARRNF's Halleck Creek processing?
