Lo Herma’s Future Hinges on Upcoming Hydrogeological and Drilling Data

Hydrogeological Testing Marks a Milestone

American Uranium Limited (ASX – AMU) has taken a significant step forward at its flagship Lo Herma In-Situ Recovery (ISR) uranium project in Wyoming’s Powder River Basin by commencing hydrogeological testing. This work, conducted by the experienced Petrotek Corporation, aims to validate the aquifer’s performance; a critical factor for ISR mining viability. The testing is expected to take approximately two weeks, with results anticipated by the end of 2026.

Concurrent Drilling Campaign Progresses

Alongside the hydrogeological program, Phase 1 of the resource development drilling campaign is well underway and has passed the halfway mark. This drilling effort is designed to expand the current 8.57 million pounds uranium resource at Lo Herma. Initial drilling results are also expected before the end of 2026, feeding into an updated Mineral Resource Estimate and Scoping Study scheduled for release next year.

Strategic Importance of Lo Herma

Lo Herma stands out as one of the few near-term, low-cost ISR uranium projects in the United States. CEO Bruce Lane highlighted the project’s potential to capitalize on growing support for the US domestic nuclear fuel supply chain. The hydrogeological testing will confirm aquifer transmissivity and sustainable pumping rates, essential parameters for efficient ISR operations and future wellfield planning.

Technical Foundations and Next Steps

Earlier in 2025, four groundwater monitoring wells were drilled and completed to collect hydrogeological data, confirming the submergence of mineralisation within the aquifer suitable for ISR mining. The current step-drawdown tests will refine understanding of hydraulic properties and well efficiency. Following these results, further testing is planned to support mine permitting, including long-term aquifer pumping tests and additional monitoring wells.

Looking Ahead

With these programs progressing in tandem, American Uranium is laying the groundwork for a robust resource update and feasibility assessment. The outcomes will be pivotal in advancing Lo Herma towards development, aligning with broader strategic goals to bolster uranium supply amid increasing demand for clean energy resources.