ARR AMERICAN RARE EARTHS LTD

Continued Exceptional Drilling Results at Halleck Creek

Continued Exceptional Drilling Results at Halleck Creek

Recent RC drilling assays confirm significantly higher grades (+26%)

Highlights

  • 15 RC holes each drilled to 102 m for a total of 1,530 m.
  • Assay results confirm higher-grade rare earth mineralization from surface, remaining open at depth:

    • Average TREO grade increased 26% to 4,179 ppm for the entire exploration program.
    • Highest grade assay of 11,040 ppm TREO.
  • Numerous holes exhibit grades exceeding 1500 ppm TREO along nearly their entire 102 m length, including;

    • HC23-OM044: 102 m @ 5472 ppm TREO
    • HC23-OM038: 100.5 m @ 4493 ppm TREO
    • HC23-OM033: 102 m @ 4291 ppm TREO
    • HC23-OM042: 100.5 m @ 4281 ppm TREO

  • Neodymium and Praseodymium (NdPr) distribution continues at 23%.
  • Resource modeling update is currently underway with significant upgrade to JORC resource estimates expected in the coming months.

DENVER, Dec. 14, 2023 (GLOBE NEWSWIRE) -- (ASX: ARR | ADRs - OTCQX: AMRRY | Common Shares - OTCQB: ARRNF) (“ARR” or the “Company”) is pleased to announce continued exceptional drilling results from its October-November 2023 drilling campaign1,2 at Overton Mountain, located within the broader Halleck Creek Rare Earths project area. See Figure 1. Of the fifteen-reverse circulation (RC) holes drilled, there was an average TREO value 24% higher than that of the Company’s previous JORC resource estimate3 (3,309 ppm TREO). Nine of the fifteen RC holes exhibit an average TREO value of greater than 4,000 ppm, utilizing a cutoff value of 1,500 ppm. The addition of the final RC assays will be a significant contribution to upgrading the Company’s current 1.43 billion tonne JORC resource. The fence diagrams presented herein illustrate the homogenous nature of the deposit which lends itself to low-cost, near-zero strip ratio mining operations. See Figure 2.

CEO Donald Swartz commented on the results:

“Exceptional results from the recent resource upgrade drilling campaign at the Halleck Creek Resource Area have not only surpassed our expectations, but are expected to exceed our previous resource estimates. The average TREO values of the RC holes, especially HC23-OM044's outstanding intercept, demonstrate the potential of this project.”

“These results along with the recently announced diamond drilling results provide us confidence to be able to provide shareholders with a significant upgrade to our JORC resource estimates, which is expected in Q1 2024.”

  1. ASX announcement November 1, 2023
  2. ASX announcement December 7, 2023
  3. ASX announcement March 30, 2023

Extract from Technical Summary

Since the announcements on November 1, 2023 and December 7, 2023, assays for all fifteen RC holes drilled at the Overton Mountain resource area have been received. The drill holes were spaced between 50 and 75 meters apart showing vertical and lateral continuity across the exploration area. Major intercepts from RC assays reinforce excellent results produced from diamond core. ARR is confident that a significant measured resource will be achieved.

HC23-OM044 is the most impressive RC hole, exhibiting the best intercept observed at the Halleck Creek to date.

  • HC23-OM044 averages 4,207 ppm TREO over 57.00 m; averages 8,364 ppm TREO over 31.50 m.

Average NdPr comprises 23% of TREO from all fifteen RC holes, consistent with previously announced diamond core results. Penalty elements remain de minimis, with an average thorium concentration of 69 ppm, and an average uranium oxide concentration of 7 ppm.

This announcement has been approved by the CEO of American Rare Earths.

Full technical summary and JORC Report can be found .

Competent Persons Statement: The information in this document is based on information compiled by personnel under the direction of Mr. Dwight Kinnes. This work was reviewed and approved for release by Mr. Dwight Kinnes (Society of Mining Engineers #4063295RM) who is employed by American Rare Earths and has sufficient experience which is relevant to the style of mineralisation and type of deposit under consideration and to the activity which he is undertaking to qualify as a Competent Person as defined in the 2012 JORC Code. Mr. Kinnes consents to the inclusion in the report of the matters based upon the information in the form and context in which it appears.

About American Rare Earths Limited:

(ASX: ARR | ADRs - OTCQX: AMRRY | Common Shares - OTCQB: ARRNF) owns the Halleck Creek, WY and La Paz, AZ rare earth deposits which have the potential to become the largest and most sustainable rare earth projects in North America. American Rare Earths is developing environmentally friendly and cost-effective extraction and processing methods to meet the rapidly increasing demand for resources essential to the clean energy transition and US national security. The Company continues to evaluate other exploration opportunities and is collaborating with US Government-supported R&D to develop efficient processing and separation techniques of rare earth elements to help ensure a renewable future.

Head Office

American Rare Earths Ltd

1658 Cole Blvd, Suite G30

Lakewood, CO, 80401



americanrareearths.com.au

For additional information:

Susan Assadi

Media Relations US



347 977 7125

Beverly Jedynak

Investor Relations US



312 943 1123

Figure 1 - Location of drillholes from Fall 2023 Drilling Campaign



Figure 2 – Fence diagram of 2023 core and RC holes with assays



Photos accompanying this announcement are available at:



EN
14/12/2023

Underlying

To request access to management, click here to engage with our
partner Phoenix-IR's CorporateAccessNetwork.com

Reports on AMERICAN RARE EARTHS LTD

 PRESS RELEASE

American Rare Earths’ Shareholder Letter

American Rare Earths’ Shareholder Letter DENVER, Feb. 09, 2026 (GLOBE NEWSWIRE) -- Dear Shareholders, January marked my first full month as Chief Executive Officer of American Rare Earths, and I want to begin by thanking you for the trust you have placed in our team and in me personally. It has been an exceptionally busy and energizing start, and I am more convinced than ever that this company is uniquely positioned to become a cornerstone of the United States rare earths supply chain. After some three decades in mining, I have learned that you can optimize many things in a project; c...

 PRESS RELEASE

American Rare Earths Partners with University of Wyoming to Explore By...

American Rare Earths Partners with University of Wyoming to Explore Byproducts Associated with Future Rare Earths Production at Halleck Creek Highlights American Rare Earths in partnership with the University of Wyoming has been selected for a research award to examine and explore end-uses for the tailings and other byproducts resulting from rare earth elements production at Halleck Creek. Determining viable end-uses for byproducts may potentially enhance Halleck Creek’s economics and reduce the project’s overall footprint. DENVER, Jan. 22, 2026 (GLOBE NEWSWIRE) -- (ASX: ARR | OTCQX: A...

 PRESS RELEASE

U.S. Trade Proclamation Reinforces Importance of Domestic Rare Earths ...

U.S. Trade Proclamation Reinforces Importance of Domestic Rare Earths Supply Chain DENVER, Jan. 21, 2026 (GLOBE NEWSWIRE) -- (ASX: ARR | OTCQX: ARRNF | ADR: AMRRY) recognizes the significance of a U.S. trade proclamation issued on January 14, 2026 to adjust imports of processed critical minerals and their derivative products under Section 232 of the Trade Expansion Act. The proclamation is aimed at strengthening domestic supply chains and reducing strategic vulnerabilities in national defense and advanced manufacturing supply chains. The proclamation acknowledges that heavy reliance on ...

 PRESS RELEASE

Rare Earths Oxide Produced From Halleck Creek Ore

Rare Earths Oxide Produced From Halleck Creek Ore Major Technical Breakthrough Highlights Rare earth oxides were produced from Halleck Creek ore using the updated preliminary Pre-Feasibility Study (“PFS”) mineral processing flowsheet1A Mixed Rare Earth Oxalate and Mixed Rare Earth Oxide were created from purified leachate solution using the material from the impurity removal testing2This is the most significant technical milestone achieved for the Project to date DENVER, Dec. 16, 2025 (GLOBE NEWSWIRE) -- (ASX: ARR | OTCQX: ARRNF | ADR: AMRRY) (“ARR” or the “Company”) has successfully...

 PRESS RELEASE

American Rare Earths Appoints Mark Wall as Chief Executive Officer to ...

American Rare Earths Appoints Mark Wall as Chief Executive Officer to Lead Next Phase of U.S. Growth DENVER, Dec. 08, 2025 (GLOBE NEWSWIRE) -- American Rare Earths (ASX: ARR | OTCQX: ARRNF | ADR: AMRRY) (“ARR”, “American Rare Earths” or the “Company”) is pleased to announce the appointment of Mark Wall as Chief Executive Officer, effective January 5, 2026. Mr. Wall brings more than 30 years of global mining experience across operations, project development, permitting and construction in gold, copper, diamonds and uranium, including senior leadership roles with Tier 1 majors and North Am...

ResearchPool Subscriptions

Get the most out of your insights

Get in touch