American Uranium Extends Lo Herma Uranium Mineralisation by 3km with Strong Drill Results

Resource Expansion Drilling Success

American Uranium Limited (ASX – AMU) has announced the completion of a significant 2025 resource expansion drilling campaign at its flagship Lo Herma ISR Uranium Project, located in Wyoming’s prolific Powder River Basin. The program, comprising 50 mud rotary drill holes totaling approximately 16,300 metres, has confirmed substantial extensions of uranium mineralisation trends up to 3,000 metres north of the previously proposed Mine Units 1 and 2.

The drilling campaign delivered the company’s strongest uranium intercept to date, with hole LH-25-048 returning a grade-thickness (GT) of 1.41 over 7.6 metres, including a high-grade 1 metre section at 0.143% equivalent uranium oxide (eU3O8). These results underscore the continuity and robustness of mineralisation across multiple stacked sandstone units within the Wasatch and Fort Union formations, which are well-known hosts for roll-front uranium deposits in the region.

Strategic Project Growth and De-risking

Alongside the drilling, American Uranium has secured twelve new mineral claims covering 96 hectares contiguous with the existing project boundary, further extending the project’s footprint north of Mine Unit 2. This expansion aligns with the company’s strategy to grow and de-risk the Lo Herma project ahead of a planned 2026 Mineral Resource Estimate (MRE) update and Scoping Study.

Hydrogeological testing, recently completed by Petrotek, is expected to provide critical data on aquifer transmissivity, a key factor for the in-situ recovery (ISR) mining method proposed for Lo Herma. These technical advancements aim to validate the project’s economic and operational feasibility, moving it closer to potential development.

Context within the Powder River Basin

Lo Herma’s location in Converse County places it near several permitted ISR uranium production facilities, including those operated by major industry players such as Uranium Energy Corp and Cameco. The Powder River Basin has a long history of uranium mining, particularly via ISR methods, which are considered more environmentally friendly and cost-effective compared to conventional mining.

American Uranium’s extensive historical data acquisition and modern drilling campaigns have built a comprehensive geological understanding of the area. The current resource estimate stands at 8.57 million pounds of uranium oxide, with exploration targets indicating potential for further resource growth.

Looking Ahead

With the 2025 drilling program now complete, American Uranium is poised to integrate these new results into an updated MRE and advance the Lo Herma project through its next development phases. The company plans to resume drilling in 2026, focusing on infill drilling and additional monitoring wells to enhance resource confidence and support the forthcoming Scoping Study update.

CEO Bruce Lane expressed optimism about the project’s trajectory, highlighting the successful demonstration of mineralisation continuity and the promising grades encountered. As the uranium market continues to attract attention amid global energy transitions, Lo Herma’s progress will be closely watched by investors and industry observers alike.