American Uranium Limited (ASX: AMU, OTCQB: AMUIF) has released an updated resource estimate for its flagship Lo Herma project in Wyoming’s Powder River Basin, reporting a 16% increase in total resources to 9.96 million pounds of U3O8, the tradeable form of uranium oxide used to gauge project size in the industry. According to a press release issued by the company on August 4, 2026, the update comes ahead of a scoping study the company is targeting for early in the fourth quarter of 2026, an early-stage study that estimates a project’s potential economics before more detailed engineering work begins.
What Changed
The company reported that Indicated Resources, the more reliable of the two resource categories used in mining (Indicated resources carry higher geological confidence than the less-certain Inferred category), grew 72% to 4.7 million pounds of U3O8. Within the specific area the company plans to cover in its scoping study, confidence levels rose to 54% Indicated, up from 32% previously. The resource base that will feed into the scoping study itself grew 23%, to 7.38 million pounds of U3O8. These figures follow the completion of a 120-hole drilling program carried out over 2025 and 2026, all of which the company says has now been incorporated into the updated resource estimate.
The Technical Picture
Lo Herma is what’s known as an ISR project, short for in-situ recovery, a uranium mining method that dissolves uranium from the rock using a fluid pumped underground rather than digging a conventional pit or shaft. It tends to have a lower upfront capital cost than conventional mining, which is part of why the company is highlighting resource growth ahead of its scoping study. The company said it also plans hydrogeological pump testing, which evaluates how fluid moves through the rock, as part of advancing the project.
Company Framing on Peer Comparisons
American Uranium describes Lo Herma as increasingly comparable, on a contained-resource and development-readiness basis, to nearby ISR projects including Ur-Energy’s Shirley Basin and Uranium Energy Corp’s Luderman project, both of which the company says have advanced using a hub-and-spoke ISR development model. That comparison is the company’s own characterization rather than an independent assessment, and readers evaluating it should note that resource size alone does not determine whether a project reaches production or how it will be financed.
Beyond Lo Herma
The company said its total mineral resources across its Wyoming holdings now stand at 11.62 million pounds of U3O8, which includes additional prospective ISR ground in the state’s Great Divide Basin. American Uranium also holds early-stage conventional uranium and vanadium assets in Utah’s Henry Mountains.
Sources
Editorial Disclosure
This article is based on a press release issued by American Uranium Limited on August 4, 2026, distributed via PRNewswire. Securities discussed: American Uranium Limited (ASX: AMU; OTCQB: AMUIF), and by way of comparison referenced in the source release, Ur-Energy Inc. and Uranium Energy Corp. Mining Markets Report has not received compensation from American Uranium, its management, investor relations representatives, or any third party for this coverage. No staff member or principal of Mining Markets Report holds a position in any security mentioned in this article. Mineral resource estimates, including Indicated and Inferred resource classifications, are geological estimates and are not guarantees of the quantity or quality of uranium that can be economically extracted. The timing of the planned scoping study, its outcome, and any future development of the Lo Herma project are forward-looking and involve known and unknown risks; there is no assurance the project will reach production or that a scoping study will yield a positive economic result. Comparisons to other companies’ projects reflect the source company’s own characterization and have not been independently verified by Mining Markets Report. References to these companies are for market context and analytical purposes only and do not constitute an investment recommendation. All securities carry investment risk including possible loss of capital. Coverage on Mining Markets Report is for informational and educational purposes only; Mining Markets Report is not a registered investment advisor. Readers should conduct their own due diligence and consult a qualified financial advisor before making investment decisions.
