American Uranium (ASX:AMU) restarts Lo Herma drilling with resource growth and upgrade in focus
February 6, 2026American Uranium has restarted field activity at its Lo Herma ISR uranium project in Wyoming’s Powder River Basin, mobilising a mud rotary drill rig to site as it moves into the next phase of resource development work.
The campaign is positioned as a continuation of earlier successful drilling and is tied directly to a scheduled interim Mineral Resource update and subsequent study work through 2026, with the company describing Lo Herma as one of the few near term, low cost ISR uranium projects in the U.S.
Highlights
- Drill rig mobilised to restart drilling w/c 9 February at the Lo Herma ISR uranium project
- Program follows prior drilling that extended mineralisation 3km along trend
- Current resource base stands at 8.57Mlb, with drilling targeting expansion and upgrade
- Up to 15 additional holes planned in the current phase ahead of an interim resource update by end Q1 2026
- Infill drilling at Mine Units 1 and 2 planned for Q2 2026, followed by a Mineral Resource upgrade and updated Scoping Study in Q3 2026
The company confirms it holds permits for up to 121 drill hole locations and up to 37,500 metres of drilling at Lo Herma, with the program structured around staged step out and infill work designed to support both resource growth and classification upgrades.
An initial step out phase comprising 50 holes for approximately 15,000 metres was completed in December 2025, targeting expansion predominantly to the north of proposed Mine Unit 1 and Mine Unit 2, with results expected to feed into the next resource update scheduled for the end of Q1 2026.
The newly announced phase continues that expansion program and is expected to include up to 15 holes for approximately 6,900 metres, with stated goals of extending mineralised trends further north and adding targeted infill drilling to increase resource confidence.
A follow up phase of about 56 infill holes for approximately 16,000 metres is then planned for Q2 2026, specifically aimed at upgrading Inferred Mineral Resources to Indicated or Measured categories within Mine Units 1 and 2, ahead of an updated Scoping Study in Q3 2026.
Management links the drilling sequence directly to study level outcomes and peer project benchmarks in the same basin. As American Uranium CEO and Executive Director Bruce Lane states,
“The Scoping Study aims to demonstrate Lo Herma’s potential to deliver similar economic potential to ISR uranium mines currently planned or constructed in Wyoming such as Ur Energy’s Shirley Basin project.”
The announcement also reiterates that the Lo Herma Mineral Resource Estimate was prepared by BRS and released to ASX on 12 December 2024, with the company confirming it is not aware of any new information or data that materially affects that estimate, and that all material assumptions and technical parameters continue to apply.
A recent hydrogeological study is cited alongside drilling as part of the project advancement pathway.
From an investor standpoint, the disclosed timetable sets out a sequenced program of expansion drilling, infill drilling, resource updates and study work extending through Q3 2026, with each phase tied to defined technical outputs rather than open ended exploration.
The combination of permitted drill capacity, multiple planned resource updates and a scheduled Scoping Study refresh positions Lo Herma within a structured ISR development workflow in the Powder River Basin, with progress measured against resource size, classification and study level milestones rather than exploration upside alone.
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