American Uranium (ASX:AMU | OTC:AMUIF) extends Lo Herma uranium system with strongest drill intercept to date

American Uranium Limited has completed a 50 hole resource expansion drilling program at its Lo Herma in situ recovery uranium project in Wyoming’s Powder River Basin, confirming that uranium mineralisation extends materially beyond the current proposed Mine Units 1 and 2 while also delivering the strongest drill intercept recorded at the project to date.

The drilling program totalled approximately 16,300 m and was executed within existing permit limits, providing additional technical data to support future resource and study updates without introducing permitting delays.

The drilling targeted projected redox trends extending north of the existing resource envelope, with results confirming lateral continuity of uranium mineralisation across multiple stacked sandstone units within the Wasatch and Fort Union formations.

Mineralisation was intersected on all drill lines completed in both Mine Unit 1 and Mine Unit 2 extension areas, confirming the reliability of the geological model across the tested strike length.

In parallel with drilling, hydrogeological testing was completed to assess aquifer characteristics relevant to in situ recovery development, while additional land tenure was also secured along strike of confirmed mineralised trends.

Bruce Lane, Chief Executive Officer and Executive Director, addresses key investor questions arising from the latest drilling outcomes and outlines how the results inform the next phase of technical work at Lo Herma.

How does the 2025 drilling program alter the scale and confidence of the Lo Herma uranium system?

The 2025 drilling program materially expands the interpreted footprint of uranium mineralisation at Lo Herma by confirming continuity of mineralised sandstone units extending up to 3,000 m north of the currently proposed Mine Units 1 and 2, which significantly increases the known strike length of the system.

A total of 50 drill holes were completed for approximately 16,300 m, with mineralisation encountered on every drill line completed in both northern extension areas, providing consistent geological confirmation across the tested trends.

North of Mine Unit 1, drilling confirmed mineralisation across approximately 2,000 m of strike at depths around 275 m, while drilling north of Mine Unit 2 extended mineralised trends over a further 1,000 m at depths of up to 425 m.

These results demonstrate that the uranium bearing roll front systems extend well beyond the current resource boundaries and support the interpretation of laterally continuous mineralisation within stacked sand units.

The consistency of mineralisation across both depth and strike reinforces confidence in the broader scale potential of the Lo Herma system.

What is the significance of the LH-25-048 intercept relative to previous drilling at Lo Herma?

Hole LH-25-048 represents the strongest drill result recorded at Lo Herma to date when assessed on a total hole grade thickness basis, returning a combined mineralised interval of 13.5 ft at an average grade of 0.078% eU3O8 and delivering a total hole GT of 1.41.

The mineralisation occurs within two stacked sandstone units and includes a total mineralised thickness of 7.6 m above the 0.02% eU3O8 cut off, which is consistent with the established geological model for the project.

The intercept confirms that the northern extensions of the Lo Herma system host uranium mineralisation that is comparable to, and in some cases stronger than, results achieved within the existing resource area.

This outcome provides further confidence that resource expansion drilling has the potential to deliver additional high quality material beyond the current mine unit footprint.

How does the drilling support progression toward an updated Mineral Resource Estimate and Scoping Study?

The drilling program was designed to test projected exploration target trends beyond the existing Mineral Resource Estimate, with drill lines oriented perpendicular to interpreted redox fronts to assess continuity, thickness, and grade distribution across the extended system.

The consistent intersection of mineralisation across all drill lines provides the geological and spatial data required to evaluate potential inclusion of these areas in a future Mineral Resource Estimate update.

In addition, confirmation of mineralised sand continuity over extended strike lengths supports increased confidence in the geological model underpinning resource estimation.

The drilling results now provide a robust technical foundation for detailed geological evaluation ahead of planned infill and expansion drilling during 2026.

This work is intended to support both a Mineral Resource Estimate update and eventually a subsequent Scoping Study update as the project advances.

What role does hydrogeological testing play in advancing Lo Herma toward development?

Hydrogeological testing is a critical component of evaluating an in situ recovery uranium project, as it provides data on aquifer transmissivity and permeability that directly influence well field design and operating performance.

At Lo Herma, pump testing was completed, alongside the drilling program, aimed at validating aquifer characteristics within the mineralised sandstone units.

The hydrogeological testing results are expected to be integrated with the latest drilling data to guide future drilling programs, monitoring well placement, and broader development planning.

This work represents an important technical de risking step that complements resource expansion drilling by addressing subsurface fluid flow characteristics required for ISR project evaluation.

How does land tenure expansion support future exploration and development strategy?

The staking of 12 new mineral claims totalling approximately 96 ha extends the Lo Herma project footprint north of proposed Mine Unit 2 along strike of confirmed mineralised trends identified through the 2025 drilling program.

These claims are contiguous with the existing project boundary and were secured following confirmation that uranium mineralisation is likely to continue into these northern areas.

Securing this additional ground supports future resource expansion drilling across the expanded interpreted mineralised system, while also providing flexibility for potential future mine unit planning should additional resources be defined during subsequent Mineral Resource Estimate updates.

Advancing technical definition ahead of 2026 updates

The completion of the 2025 drilling and hydrogeological programs provides American Uranium with a more comprehensive understanding of the scale, continuity, and geological controls of uranium mineralisation at Lo Herma, while strengthening the technical foundation required for future project evaluation.

With resource expansion drilling completed as planned, additional land tenure secured along confirmed mineralised trends, and hydrogeological data pending full integration, the company is positioned to focus on detailed geological analysis and targeted follow up work.

These activities are expected to inform further infill and expansion drilling during 2026, supporting updated Mineral Resource and Scoping Study assessments as the project advances through successive stages of technical de risking.

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