American Uranium (ASX: AUM) expands Lo Herma and sets up Q3 resource update
April 20, 2026Bruce Lane, Executive Director of American Uranium, spoke with MarketOpen to further discuss the Company’s expansion of mineral rights and claim staking at the Lo Herma ISR Uranium Project in Wyoming’s Powder River Basin.
The update centres on securing additional ground immediately adjacent to existing Mine Units 2 and 3, where previous land tenure boundaries limited resource estimation and project flexibility. The expanded land position is positioned to support upcoming drilling and technical work, with a program of 55 permitted holes scheduled to commence in early May 2026.
The results of this work are expected to inform a planned Mineral Resource Estimate update and Scoping Study targeted for Q3 2026.
What has materially changed in resource definition and extension potential following the removal of land tenure constraints around Mine Units 2 and 3?
The key change is that we have removed land tenure constraints over areas that directly abut our existing Mineral Resources in Mine Units 2 and 3, which previously limited how far those resources could be extended and formally estimated.
With the addition of approximately 1,040 acres of new mineral rights and further claim staking, we now control ground immediately adjacent to defined resource areas, including zones that were identified during prior modelling but could not be incorporated due to boundary limitations.
This changes our position from being constrained by tenure boundaries to having continuity across those extensions, allowing us to test and potentially include these areas in future Mineral Resource updates, subject to drilling and technical evaluation.
In practical terms, this provides a pathway to expand the resource footprint into adjoining areas where mineralisation has been identified, while also allowing for optimisation of Mine Unit boundaries and ISR wellfield design.
Does securing adjacent mineral rights de risk the existing resource base, or does it primarily increase exploration upside that still requires drilling validation?
Securing the adjacent mineral rights removes land tenure constraints around the existing resource base, but it does not change the underlying Mineral Resource, which remains supported by existing drilling and technical work.
What has changed is our control over ground immediately adjoining Mine Units 2 and 3, including areas identified during prior modelling that could not be incorporated due to tenure boundaries. This allows these areas to be assessed for inclusion in future Mineral Resource updates, subject to drilling and evaluation.
From a project perspective, the expanded land position supports optimisation of Mine Unit boundaries and development planning. However, the newly secured ground requires drilling validation before any contribution to Mineral Resources can be confirmed.
What specific outcomes from the 55 hole program are required to support a Mineral Resource update and Scoping Study in Q3 2026?
The 55 hole program is intended to deliver the drilling and technical data required to support both a Mineral Resource update and Scoping Study.
The program includes infill and expansion drilling within existing Mine Units, as well as step out drilling into newly secured areas south of Mine Unit 2, which will test whether mineralisation extends into these areas.
This work is supported by ongoing hydrogeological and technical field programs designed to inform future development studies.
Results from this drilling and associated technical work are expected to inform the planned Mineral Resource Estimate update and Scoping Study during Q3 2026, subject to data quality, analysis and market conditions.
How should investors assess timing risk between exploration success, resource conversion, and development under the new mineral rights tenure?
Timing is governed by the sequence of drilling, data analysis, and technical evaluation required to support a Mineral Resource update and Scoping Study.
The expanded mineral rights position ensures that areas adjoining existing resources can be assessed and potentially incorporated into future updates, but progression remains dependent on the outcomes of drilling and associated technical work.
Drilling of the remaining permitted holes is expected to commence in early May 2026, and results from this program, together with ongoing fieldwork, will inform the next stage of project evaluation.
Advancement beyond this point is contingent on data quality, analysis, and broader market conditions, which determine the timing of the Mineral Resource update and Scoping Study.
Execution focus shifts to drilling and data delivery
The next phase at Lo Herma is defined by the completion of drilling and supporting technical work required to inform a Mineral Resource update and Scoping Study. The expanded land position provides control over areas adjoining existing resources, enabling these areas to be assessed within future updates. For American Uranium, progression remains dependent on the outcomes of the upcoming program, with results expected to guide the planned advancement of the project during Q3 2026, subject to data quality, analysis and market conditions.
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