Lo Herma Drilling Expands Resource; Hydrogeology Tests Confirm Aquifer Strength

Hydrogeological Testing Validates Aquifer Potential

American Uranium Limited (ASX, AMU) has successfully completed a critical phase of hydrogeological testing at its flagship Lo Herma ISR uranium project in Wyoming’s Powder River Basin. Conducted by Petrotek Corporation, a specialist in injection well and subsurface resource testing, the program demonstrated sustained flows across all monitored wells with minimal aquifer drawdown. These results are pivotal in confirming the aquifer’s transmissivity, a key factor for the viability of in-situ recovery (ISR) uranium extraction.

The final detailed report from Petrotek is anticipated before the end of 2025, which will provide a comprehensive analysis of the pump testing data. This milestone marks a significant step forward in validating the project’s hydrogeological framework and supports the company’s development pathway.

Resource Expansion Drilling Progresses as Planned

Alongside hydrogeological testing, AMU has been advancing its resource expansion drilling program. Since October 21, 2025, drilling has targeted areas north of the proposed Mine Units 1 and 2, focusing on extending known mineralised trends at depths ranging from approximately 275 to 425 meters. Early observations indicate continuity of mineralised sands and favourable redox conditions, reinforcing the potential for resource growth in these zones.

With 31 drill holes completed north of Mine Unit 1 and an additional seven north of Mine Unit 2, the program is designed to bolster geological confidence ahead of the planned 2026 Mineral Resource Estimate update. Concurrent infrastructure improvements, such as access road upgrades, are also underway to support ongoing and future drilling activities.

Strategic Steps Toward 2026 Scoping Study Update

These combined hydrogeological and drilling efforts are integral to de-risking the Lo Herma project and advancing it toward a 2026 Scoping Study update. The study will incorporate new data to refine resource estimates and development plans, providing investors and stakeholders with a clearer picture of the project’s potential.

AMU’s CEO Bruce Lane expressed optimism about the progress, highlighting the encouraging initial test results and the continuity of mineralisation observed during drilling. The company’s methodical approach underscores its commitment to advancing Lo Herma as a significant ISR uranium project in the Powder River Basin.