Perth, Australia – American Uranium Limited (ASX:AMU; OTCID:AMUIF) has appointed specialist subsurface engineering group Petrotek Corporation to undertake hydrogeological testing at its flagship Lo Herma in-situ recovery (ISR) uranium project in Wyoming’s Powder River Basin, as part of a broader program to expand and upgrade the project’s 8.57 million-pound uranium resource.
The testing - set to commence in November 2025 - will run concurrently with Phase 1 of the project’s two-phase resource development drilling campaign, which targets approximately 50 holes aimed at growing the current resource base and increasing confidence in existing mineralisation. Results will underpin an updated Mineral Resource Estimate and Scoping Study scheduled for release in 2026.
Petrotek, a leading U.S. consultancy with nearly three decades of experience in ISR wellfield design and aquifer analysis, will perform step-drawdown (pump) testing to assess aquifer performance, sustainability, and transmissivity - key metrics for ISR mining.
Commenting on the important milestone, CEO and Executive Director, Bruce Lane confirmed:
“Our upcoming hydrogeological testing and resource development drilling programs at Lo Herma represent major steps toward advancing one of America’s most promising ISR uranium projects. Lo Herma is one of the few near-term, low-cost ISR projects in the U.S. and the hydrogeological testing to be undertaken by Petrotek aims to validate our initial aquifer observations and affirm our confidence in the aquifer transmissivity. We are delighted to have secured Petrotek’s significant expertise and experience with analogous ISR uranium projects in the Powder River Basin.
In addition, the drilling campaign will target both growth in the current 8.57Mlb resource base and increased confidence in existing mineral resources along with further validation of the project’s hydrogeology.
This work is expected to feed into an updated Mineral Resource Estimate and Scoping Study in 2026, positioning us to deliver value from America’s nuclear energy revival.”
Next Steps
Hydrogeological testing will be conducted on the four monitor wells completed earlier this year, which confirmed the Lo Herma mineralisation lies within a saturated aquifer suitable for ISR mining. Laboratory testing of drill core samples previously returned hydraulic parameters consistent with efficient ISR wellfield operations.
Following the November program, American Uranium plans further long-term aquifer testing and installation of additional monitoring wells to support future mine-permit applications.
ENDS
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About American Uranium
American Uranium Limited (ASX:AMU; OTCID:AMUIF) is focused on defining and developing economic in-situ recovery (ISR) uranium resources as part of the U.S. domestic uranium mining revival. AMU’s flagship and most advanced Lo Herma Project leads the Company’s project portfolio and is strategically positioned in Wyoming’s Powder River Uranium Basin, the most significant uranium production district in the U.S.
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