Mr. Thomas Lamb reports

CORRECTION FROM SOURCE: MYRIAD URANIUM ANNOUNCES PRELIMINARY RADIOMETRIC RESULTS FROM LUCKY CLIFF DRILLING

Myriad Uranium Corp.'s press release issued on Thursday, Aug. 20, 2026, contained an error.

The release stated in its historical resource estimates section that the historical estimate of 26.63 million pounds eU3O8 (equivalent triuranium octoxide) is contained in "44.1 million tonnes at 171 parts per million eU3O8," using a 100-part-per-million cut-off. This should have read "48.95 million tonnes at 269 parts per million eU3O8."

All other information in the original news release remains unchanged.

Historical resource estimates

The historical estimate of 26.63 million pounds eU3O8 in 48.95 million tonnes at 269 ppm eU3O8, using a 100-part-per-million cut-off, was compiled from internal Rocky Mountain Energy Company reports, which are summarized in a report titled "Copper Mountain Exploration Project Report" by G.G. Southard et. al. (1979). A qualified person has not done sufficient work to classify the historical estimate as current mineral resources or mineral reserves, and Myriad is not treating the historical estimate as current mineral resources or mineral reserves.

The historical estimates were completed using polygonal methods based on modelled mineralization geometries. The historical estimates used U.S. Bureau of Mines categories at the time, including terms described as inferred and indicated, which are not current CIM (Canadian Institute of Mining, Metallurgy and Petroleum) terminology and should not be interpreted as current mineral resource categories. Details of the historical resource estimates are available in the current National Instrument 43-101 technical report. While the qualified person has determined that the historical estimates described in this news release are relevant to the Copper Mountain project area, are reasonably reliable given the authors and circumstances of their preparation, and are suitable for public disclosure, the estimates are decades old and based on drilling data for which the logs are, as of yet, predominantly unavailable. Readers are cautioned not to place undue reliance on these historical estimates as an indicator of current mineral resources or mineral reserves at the project area. Also, while the Copper Mountain project area contains all or most of each deposit referred to, some of the resources referred to may be located outside the current Copper Mountain project area.

Inherent limitations of the historical estimates include that the nature of mineralization (fracture hosted) makes estimation from drill data less reliable than other deposit types (e.g. those that are thick and uniform). From Myriad Uranium's viewpoint, limitations include that the company has not been able to verify the original data itself and that the estimates may be optimistic relative to subsequent work, which applied a delayed fission neutron (DFN) factor to calculate grades. On the other hand, DFN is controversial, in that the approach is viewed by some experts as too conservative. Nevertheless, it was applied in later resource estimations by Union Pacific relating to Copper Mountain. To verify the historical estimates and restate them as current resources, a program of redrilling is required to generate new data that can be used to establish the correlation and continuity of geology and grades between boreholes with sufficient confidence to estimate mineral resources.

Qualified person

The scientific and technical information in this news release, including the eU3O8 methodology and historical disclosure, has been reviewed and approved by George van der Walt, MSc, PrSciNat, FGSSA, a qualified person as defined under NI 43-101. Mr. van der Walt is a principal consultant with The MSA Group Pty. Ltd., an independent consultancy, and is independent of the company for the purposes of NI 43-101. A qualified person has not done sufficient work to verify historical exploration results or to classify the historical estimates referred to in this news release as current mineral resources or mineral reserves, and Myriad is not treating such historical estimates as current mineral resources or mineral reserves.

About Myriad Uranium Corp.

Myriad Uranium holds a 100-per-cent interest in the Copper Mountain uranium project in Wyoming, United States. Copper Mountain hosts multiple historic uranium deposits and past-producing mines, including the Arrowhead mine (approximately 500,000 pounds U3O8 produced). Union Pacific conducted extensive exploration and development in the district during the late 1970s, including approximately 2,000 boreholes and advanced mine planning, before the uranium market downturn in 1980. Union Pacific is estimated to have invested approximately $125-million (2026 dollars) in the project, generating significant historical resource estimates.

A news release detailing a comprehensive assessment of Copper Mountain's uranium endowment by Bendix Engineering for the U.S. Department of Energy published in 1982 can be viewed on-line.

Myriad holds a 10-per-cent free carried interest in the Red Basin uranium project, recently sold to 8VC- and Overmatch-backed Subatomic Industries. Red Basin carries significant historical resource estimates from extensive drilling by Occidental Oil in the late 1970s and also hosts vanadium, which has been designated a strategic and critical mineral by the U.S. government. Note the caution on historical estimates below.

Myriad's 100-per-cent-owned Breccia Pipe project in Arizona comprises at least 23 breccia pipes that are prospective for uranium and REEs (rare earth elements). One of the pipes, the Wate pipe, was previously owned and explored by Energy Fuels and is the subject of a historical resource estimate.

Note: A qualified person has not done sufficient work to classify the Copper Mountain, Red Basin and Breccia Pipe project historical estimates as current mineral resources or reserves and Myriad is not treating historical estimates as current resources or reserves. Myriad intends to conduct further work to determine whether the historical estimates can be verified and, if appropriate, supported by current mineral resource estimates.

We seek Safe Harbor.