Latest Developments in the Cowboy State Mine Area
Highlights
- Substantial Update to Mineral Resource Estimate: The recent Mineral Resource Estimate for the Cowboy State Mine (CSM) Area shows a reclassification of approximately 68.4 million tonnes. This improvement is based on data from 102 channel samples taken throughout 2025, which have informed a new geological resource model and mineral resource estimate.
- New Drilling Permits Secured: The company has obtained permits for 27 drill holes in the CSM area along with an additional 29 holes in the Bluegrass area, which serves as a significant exploration target and could enhance the overall resource estimates for the Halleck Creek project.
American Rare Earths (ASX: ARR | OTCQX: ARRNF | ADR: AMRRY) has announced an updated Mineral Resource Estimate for its flagship Halleck Creek Rare Earths Project, particularly focusing on the exciting Cowboy State Mine area. This latest update integrates results obtained from new channel samples and introduces additional exploration drilling permits, further marking progress for the project.
Odessa Resource Ltd., based in Perth Australia, was commissioned to conduct a thorough update of the geological resource model for the CSM area. This effort utilized the compiled data from 102 channel samples collected from various locations, leading to an enhanced understanding of the mineral landscape.
The mineral resource estimate for the Cowboy State Mine area now totals approximately 547.5 million tonnes, adhering to a cut-off grade of 1,000ppm for Total Rare Earth Oxides (TREO). The analysis from the fresh channel sample results allowed for the reclassification of nearly 63.9 million tonnes to the indicated category, reflecting an elevation from the inferred category as seen in earlier studies. Additional geological mapping has broadened the resource area, yielding another increase of roughly 4.5 million tonnes.
Significance of the Update for American Rare Earths
These revised resource estimates are crucial for incorporating near-surface resources into various operational plans and designs for the mine’s pre-feasibility study (PFS). By engaging Stantec to integrate an updated block model with ongoing process optimization results, American Rare Earths aims to enhance both pit and mine designs effectively.
As the Cowboy State Mine progresses towards developmental stages, the proactive acquisition of drilling and sampling permits plays a vital role in enriching geological data collection, freeing the pathway for post-PFS activities. This continuous focus on in-fill drilling is critical to bolstering geological confidence around proposed pit areas in subsequent technical evaluations.
Diving Deeper into Technical Insights
Update on CSM Resource Model
The commitment to advancing the geological resource model at the CSM area remains a priority. The model underwent comprehensive evaluation, employing the Leapfrog geological modeling system. Odessa’s assessment of the 102 collected channel samples translated into an increase and reclassification of significant resource estimates—now standing at 547.5 million tonnes.
In addition, accompanying geological sampling efforts have yielded essential geochemical data illustrating the TREO distribution throughout the CSM area. Adjustments to lithological domains within the model reflect an increase in indicated resources, demonstrating the continuous evolution and improvement of the project’s mineral resource potential.
Exceptional Channel Sample Insights at Red Mountain
American Rare Earths’ geologists recently mapped a banded zone at the southwestern portion of Red Mountain, collecting 13 channel samples that returned an impressive average TREO grade of 5,706 ppm. Notably, one channel sample achieved a record-breaking TREO grade of 13,816 ppm, which firmly establishes it as the highest grade found within the entirety of Halleck Creek.
The banded zone's potential was further clarified as it ranges between 1.5 to 3 meters in thickness and extends adequately across the landscape, uncovering exciting exploration opportunities.
Outlook for Future Exploration
The upcoming exploration drilling at the Cowboy State Mine aims to elevate geological confidence for potential measured resources while examining if higher-grade zones continue into the depths beneath Red Mountain. In the six months to come, the company is set to mobilize drilling efforts after establishing optimal routes and access trails.
In a parallel track, the Bluegrass exploration area has also received drilling permits, adding to the amplification of resource potential at Halleck Creek. The surface geochemical sampling and existing channel data anticipate similar TREO grades to those recorded at the Overton Mountain exploration area, supporting predictions for substantial resource expansion.
Frequently Asked Questions
What is the significance of the updated mineral resource estimate?
The update signifies a reclassification of substantial resources, enabling more effective planning and design for the mine’s operations.
What are the new drilling permits for?
They allow for further exploration and confirmation of resources in the Cowboy State Mine and Bluegrass area, enhancing the overall mineral resource estimates.
Who is involved in updating the geological model?
Odessa Resource Ltd. has been commissioned to update the geological resource model utilizing new channel sample data.
What are TREO grades, and why are they important?
TREO grades indicate the concentration of total rare earth oxides, which is crucial for evaluating the economic viability of mining operations.
How will the company advance in its future technical studies?
American Rare Earths will expand ongoing geological data collection, including in-fill drilling, to improve resource confidence and prepare for post-PFS activities.
