Test Mining Completed at the Cowboy State Mine, Comminution Optimization Tests Underway
American Rare Earths (OTCQX: AMRRY) has completed a significant test mining operation at its Cowboy State Mine within the Halleck Creek deposit. The company successfully excavated and crushed approximately 3,080 tonnes of rare earth ore, with 13.7 tonnes dispatched to various vendors for comminution testing and process optimization.
The testing program, involving partners like Fl Smidth, Loesche GmbH, Corem, and DISA Technologies, aims to optimize milling methods to minimize fines generation and enhance rare earth recoveries. The remaining ore will be stockpiled for use in a future demonstration plant, which will validate processing methods and support technical studies.
This initiative is crucial for improving the Pre-Feasibility Study economics and advancing ARR's goal of establishing a 100% domestic supply chain for critical minerals in the permanent magnet industry.
American Rare Earths (OTCQX: AMRRY) ha completato una significativa operazione di test mining presso la Cowboy State Mine all'interno della giacitura Halleck Creek. L'azienda ha efficacemente scavato e frantumato circa 3.080 tonnellate di minerale di terre rare, con 13,7 tonnellate inviate a diversi fornitori per test di frantumazione e ottimizzazione dei processi.
Il programma di test, che coinvolge partner come Fl Smidth, Loesche GmbH, Corem e DISA Technologies, mira a ottimizzare i metodi di macinazione per ridurre la produzione di particelle fini e migliorare i recuperi di terre rare. Il minerale restante verrà accantonato per un uso in un futuro impianto dimostrativo, che convaliderà i metodi di lavorazione e supporterà studi tecnici.
Questa iniziativa è cruciale per migliorare l'economia dello studio di pre-fattibilità e avanzare l'obiettivo di ARR di stabilire una catena di approvvigionamento interna al 100% per i minerali critici nell'industria dei magneti permanenti.
American Rare Earths (OTCQX: AMRRY) ha completado una importante operación de pruebas de minería en su Cowboy State Mine, dentro del yacimiento Halleck Creek. La empresa excavó y trituró con éxito aproximadamente 3.080 toneladas de mena de tierras raras, con 13,7 toneladas enviadas a varios proveedores para pruebas de molienda y optimización de procesos.
El programa de pruebas, que cuenta con socios como Fl Smidth, Loesche GmbH, Corem y DISA Technologies, tiene como objetivo optimizar los métodos de molienda para minimizar la generación de finos y mejorar los recuperos de tierras raras. El mineral restante se almacenará para su uso en una futura planta demostrativa, que validará los métodos de procesamiento y apoyará estudios técnicos.
Esta iniciativa es crucial para mejorar la economía del Estudio de Prefactibilidad y avanzar hacia el objetivo de ARR de establecer una cadena de suministro 100% doméstica para minerales críticos en la industria de los imanes permanentes.
American Rare Earths (OTCQX: AMRRY)가 Halleck Creek 매장 내 Cowboy State Mine에서 중요한 시범 광산 채굴 작업을 완료했습니다. 회사는 약 3,080톤의 희토류 광석을 성공적으로 채굴 및 파쇄했으며 13.7톤은 분쇄 테스트 및 공정 최적화를 위한 다양한 공급업체로 발송되었습니다.
Fl Smidth, Loesche GmbH, Corem, DISA Technologies와 같은 파트너들과 함께하는 이 테스트 프로그램은 파쇄 방식을 최적화하여 미세먼지 생성을 최소화하고 희토류 회수율을 높이는 것을 목표로 합니다. 남은 광석은 향후 시연 플랜트에서 사용하기 위해 순차적으로 재고 저장되며, 이를 통해 처리 방법을 검증하고 기술 연구를 지원할 예정입니다.
이 이니셔티브는 예비 타당성 연구의 경제성을 개선하고 ARR가 영구 자석 산업용 핵심 광물의 100% 국내 공급망을 확립하겠다는 목표를 추진하는 데 중요합니다.
American Rare Earths (OTCQX: AMRRY) a mené à bien une importante opération de test minier à la Cowboy State Mine, dans le gisement Halleck Creek. L’entreprise a excavé et broyé avec succès environ 3 080 tonnes de minerai de terres rares, dont 13,7 tonnes ont été expédiées à divers fournisseurs pour des essais de réduction et d’optimisation des procédés.
Le programme de tests, impliquant des partenaires comme Fl Smidth, Loesche GmbH, Corem et DISA Technologies, vise à optimiser les méthodes de broyage afin de minimiser la production de fines et d’améliorer les rendements en terres rares. Le minerai restant sera mis en stock pour une future centrale de démonstration, qui validra les méthodes de traitement et soutiendra des études techniques.
Cette initiative est cruciale pour améliorer l’économie de l’étude de faisabilité préliminaire et faire progresser l’objectif de ARR consistant à établir une chaîne d’approvisionnement 100% domestique pour les minéraux critiques dans l’industrie des aimants permanents.
American Rare Earths (OTCQX: AMRRY) hat eine bedeutende Testabbau-Operation an der Cowboy State Mine innerhalb der Halleck Creek-Lagerstätte abgeschlossen. Das Unternehmen hat erfolgreich ca. 3.080 Tonnen Seltene-Erden-Erz abgebaut und zerkleinert, wobei 13,7 Tonnen an verschiedene Anbieter für Zerkleinerungstests und Prozessoptimierung versandt wurden.
Das Testprogramm mit Partnern wie Fl Smidth, Loesche GmbH, Corem und DISA Technologies zielt darauf ab, die Mahlmethoden zu optimieren, um die Bildung von Feinstaub zu minimieren und die Seltene-Erden-Ausbeute zu erhöhen. Das verbleibende Erz wird für eine zukünftige Demonstrationsanlage gestockt, die Verarbeitungsmethoden validieren und technische Studien unterstützen soll.
Diese Initiative ist entscheidend, um die Wirtschaftlichkeit der Vor- Machbarkeitsstudie zu verbessern und ARR dabei zu unterstützen, eine 100%-ige inländische Lieferkette für kritische Mineralien in der Permanentmagnetindustrie zu etablieren.
American Rare Earths (OTCQX: AMRRY) أكملت عملية اختبار تعدين مهمة في منجم Cowboy State ضمن ترسب Halleck Creek. قامت الشركة بحفر وتكسير نحو 3,080 طن من خام الأرض النادرة، وجرى إرسال 13.7 طنًا إلى عدد من الموردين لاختبارات التكسير وتحسين العمليات.
يهدف برنامج الاختبارات، بمشاركة شركاء مثل Fl Smidth وLoesche GmbH وCorem وDISA Technologies، إلى تحسين أساليب الطحن لتقليل تكون السحن الدقيقة وتحسين معدلات استرداد الأرض النادرة. سيتم تجميع بقية الخام للاستخدام في مصنع توضيحي مستقبلي، الذي سيُصدّق طرق المعالجة ويدعم الدراسات التقنية.
هذه المبادرة حاسمة لتحسين اقتصاديات دراسة ما قبل الجدوى وتقدم هدف ARR في إقامة سلسلة توريد محلية 100% للمعادن الحيوية في صناعة المغناطيسات الدائمة.
American Rare Earths (OTCQX: AMRRY) 已在 Halleck Creek 藏量区内的 Cowboy State Mine 完成了一项重要的示范性露天开采测试。公司成功开挖并粉碎大约 3,080 吨稀土矿石，其中 13.7 吨 已发运给各供应商进行粉碎测试与工艺优化。
该测试计划与 Fl Smidth、Loesche GmbH、Corem 和 DISA Technologies 等伙伴合作，目标是优化磨矿方法，尽量减少细粉产生并提升稀土回收率。剩余矿石将被暂存，以用于未来的示范工厂，验证加工方法并支持技术研究。
这一举措对改善前 feasibility 研究的经济性以及推进 ARR 实现“100% 国内供应链”的目标，以服务于永久磁铁产业的关键矿物供应至关重要。
- Successfully extracted and crushed 3,080 tonnes of rare earth ore from test mine
- Strategic partnerships with major processing technology vendors for optimization testing
- Test mining will provide valuable data to validate technical assumptions for the Pre-Feasibility Study
- Planned demonstration plant will help de-risk the project and increase stakeholder confidence
- Testing and optimization process will extend through the remainder of the calendar year
- Project still in early stages with Pre-Feasibility Study pending completion
Highlights
- ~3,080 tonnes of Halleck Creek ore mined and crushed
- ~13.7 tonnes of ore samples sent to comminution vendors for optimization testing
- Tests will target low-effort, but high-yield opportunities to increase overall rare earth magnet element recoveries and strengthen project economics
- Remaining ore will be stockpiled as feedstock for a demonstration plant
DENVER, Sept. 23, 2025 (GLOBE NEWSWIRE) -- American Rare Earths (ASX: ARR | OTCQX: ARRNF | ADR: AMRRY) (“ARR” or the “Company”), through its subsidiary Wyoming Rare (USA) Inc. (“WRI”), has successfully completed excavation and primary crushing of approximately 3,080 tonnes of rare earth ore from a test mine at the Cowboy State Mine (“CSM”), part of the Halleck Creek deposit, under its License to Explore by Dozing1 (see Figures 1 to 4).
Weathered surface material was blasted, excavated and stockpiled adjacent to the test pit. The underlying non-weathered Halleck Creek ore was then blasted, excavated, crushed and stockpiled. Four bulk samples of ore, totaling approximately 13.7 tonnes (see Table 1), were collected and dispatched for comminution testing and additional process optimization work2. The remainder of the extracted ore will be stockpiled at the CSM site and the Western Research Institute in Laramie, Wyoming. This ore stockpile will be used as the feedstock for a demonstration plant.
The goal of the comminution testing is to assess different milling methods to minimize the volume of fines generated. Reducing the proportion of fines entering the beneficiation process (i.e., ore upgrading) will enhance overall rare earths recoveries across the entire mineral processing circuit, thereby improving the economic outcomes of the Pre-Feasibility Study (“PFS”).
Local contractors are now backfilling the excavated area with the altered surface material from the first blast. They will then replace the stockpiled topsoil and perform preliminary seeding to reclaim the area.
The test mining will also provide data to validate technical assumptions in the PFS, including drill penetration rates, blast fragmentation profiles and excavation efficiency.
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1 See ASX release dated January 8, 2025
2 See ASX release dated July 18, 2025
Table 1 – Summary of dispatched samples for comminution and optimization testing
| Vendor | Location | Approximate sample size (t) | Testing |
| Fl Smidth | Midvale, Utah | 7.0 | High pressure grinding roll (“HPGR”) |
| Loesche GmbH | Düsseldorf, Germany | 4.7 | Vertical roller mill |
| Corem | Quebec, Canada | 1.0 | Alternate HPGR |
| DISA Technologies | Casper, Wyoming | 1.0 | High pressure slurry ablation |
Why it matters? The bulk samples extracted will underpin comminution and beneficiation optimization work3, which will identify low-effort, high-impact opportunities to improve overall rare earth magnet element recoveries, enhancing the PFS project economics and further validating underlying technical assumptions. The comminution tests will occur over the remainder of the calendar year, followed by the optimized beneficiation testing.
The demonstration plant, enabled by this test mining campaign, will play a critical role in validating processing methods, generating end-product samples, and supporting future technical studies. It will also serve to technically de-risk the Halleck Creek Project and increase confidence among stakeholders, potential investors, and strategic partners.
Together, these initiatives reinforce ARR’s position as a cornerstone of the emerging domestic permanent magnet industry and advance the Company’s commitment to building a
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3 For additional details see the ASX release dated July 18, 2025
Figure 1 - Preparing the CSM Test Pit for the Second Blast
Figure 2 – Aerial view of excavating and crushing at the CSM test pit
Figure 3 - Side view of excavating and crushing at the CSM test pit
Figure 4 – Ore samples to be sent to vendors for comminution tests
This release was authorized by the Board of American Rare Earths.
Investors can follow the Company’s progress at www.americanree.com
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. (“WRI”), 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. Located on Wyoming State land, the Cowboy State Mine within Halleck Creek offers cost-efficient open-pit mining methods and benefits from streamlined permitting processes in this mining-friendly state.
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.
For further information contact:
| Susan Assadi Media Relations US sassadi@americanree.com 347 977 7125 | Beverly Jedynak Investor Relations US Beverly.jedynak@viriathus.com 312 943 1123 |
Figures accompanying this announcement are available at:
https://www.globenewswire.com/NewsRoom/AttachmentNg/693550a0-af2d-4d72-8c34-f4c9b7979854
https://www.globenewswire.com/NewsRoom/AttachmentNg/8cd4b08c-ade6-42f5-87ed-54fa2c382fff
https://www.globenewswire.com/NewsRoom/AttachmentNg/76a7dd22-303d-4421-98ef-17e60dfe207c
https://www.globenewswire.com/NewsRoom/AttachmentNg/1394ea0b-3fda-49d4-9087-57c65a41ed0b
FAQ
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