American Uranium (ASX:AMU) is advancing the Scoping Study for its Lo Herma In Situ Recovery (ISR) Uranium Project in Wyoming, US, following a successful pump test.
Large-scale testing at the proposed mine unit one, designed and analysed by hydrogeological consultant Petrotek, yielded positive results. American Uranium says the test demonstrated hydraulic communication through the proposed production aquifer, sustained pumping, and confinement that supports ISR-based production.
The well reportedly sustained a pump-limited 12.7 litres per minute for 48 hours, with drawdown stabilising at about 5.15m.
Four observation wells located 130–138m away recorded drawdown of 0.18–0.27m. Transmissivity measured approximately 47–56m² per day, with minimal directional variation. This supports the use of standard production well patterns as an assumption in the Scoping Study.
CEO Bruce Lane says the results are ‘very encouraging’, marking an important milestone for Lo Herma.
“The large-scale test provides project-specific evidence that the proposed production aquifer can sustain long-term pumping at industry standard production rates,” Lane says.
“The drawdown and confinement results showed positive outcomes that support the case for ISR mining.
“Together, the results provide a stronger hydrogeological foundation for the Scoping Study base case and advance Lo Herma towards future permitting and mine development.”
American Uranium confirms the test data is sufficient to complete the Scoping Study base case, which relies on the 4 August 2026 mineral resource estimate of 9.96 million pounds of uranium oxide.
Next steps for the company include a groundwater baseline program, higher-rate and longer-duration testing in a purpose-built production-style well, and additional testing at mine units two and three.
American Uranium is focused on exploring uranium and vanadium at its flagship Lo Herma Project in Wyoming’s Powder River Basin.
Write to Paula Fabe at Mining.com.au
Main image: American Uranium
