American Uranium kicks off hydro testing as expansion drilling passes halfway mark at Lo Herma

• Hydrogeological testing underway for Lo Herma uranium project, marking a key milestone
• Resource expansion drilling continuing in parallel, now more than 50% complete
• Both hydrogeological and drilling results anticipated before the end of 2025

Special Report: ISR resource development specialist Petrotek Corporation has begun hydrogeological testing at the Lo Herma ISR uranium project in Wyoming, US.

Project owner and operator American Uranium (ASX:AMU) anticipates the program to take about two weeks, running concurrently with a resource-expansion drilling program that is now more than halfway complete.

AMU expects to get its hands on both sets of results before the year is out, with both programs to support mineral resource estimate and scoping study updates scheduled for 2026.

American Uranium CEO and executive director Bruce Lane said the hydrogeological testing and resource development programs represent major steps toward advancing one of America’s most promising in-situ recovery (ISR) uranium projects.

“Lo Herma is one of the few near-term, low-cost ISR projects in the US,” Lane said.

“The hydrogeological testing aims to validate our initial aquifer observations and confirm aquifer transmissivity.

“The first phase of drilling is now well underway and past the halfway point, with an objective to grow the current 8.57-million-pound resource base and ultimately feed into an updated mineral resource estimate and scoping study in 2026, positioning us to capitalise on the significant support programs in place to support the US domestic nuclear sector including the fuel supply chain.”

Watch: Petrotek joins American Uranium’s push at Lo Herma

Lo Herma aquifer pump testing

Earlier this year, AMU drilled four groundwater-monitoring wells for collection of hydrogeological data back in March at Lo Herma.

All four wells demonstrated that submergence of Lo Herma mineralisation in the local groundwater aquifer is sufficient for ISR mining, while drill core tests confirmed the aquifer holds the necessary hydraulic parameters for wellfield operation.

The current testing will include step drawdown tests to determine sustainable pumping rates, well efficiency and general hydraulic properties of the resource-hosting aquifer.

That data will inform lab tests to confirm the conditions at Lo Herma are conducive to ISR mining, and support refinement of near-term wellfield planning at the scoping study level.

Once those results are in hand, AMU intends to complete another round of hydrogeological testing to support a mine permit application.

Those tests will include the installation of additional groundwater-monitoring wells, for a long-term aquifer pumping test focused on large-scale aquifer characterisation.

This article was developed in collaboration with American Uranium, a Stockhead advertiser at the time of publishing.

This article does not constitute financial product advice. You should consider obtaining independent advice before making any financial decisions.