CORRECTION FROM SOURCE: Myriad Uranium Announces Preliminary Radiometric Results from Lucky Cliff Drilling

Myriad Uranium Corp. (CSE: M) (OTCQB: MYRUF) (FSE: C3Q) ("Myriad" or the "Company") advises that the press release issued on Thursday August 20, 2026 contained an error. The release stated in its Historical Resource Estimates section that the historical estimate of 26.63 Mlbs eU₃O₈ is contained in "44.1 Mt at 171 ppm eU₃O₈", using a 100-ppm cut-off. This should have read "48.95 Mt at 269 ppm eU₃O₈". All other information in the original news release remains unchanged.

The historical estimate of 26.63 Mlbs eU₃O₈ in 48.95 Mt at 269 ppm eU₃O₈, using a 100 ppm cut-off, was compiled from internal Rocky Mountain Energy Company reports, which are summarised in a report titled "Copper Mountain Exploration Project Report" by Southard, G.G., 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 terminology and should not be interpreted as current mineral resource categories. Details of the historical resource estimates are available in the current NI 43-101 Technical Report. While the QP 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 re-state them as current resources, a program of re-drilling 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.

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., Pr.Sci.Nat., 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...