Early warning: Rush Rare Metals activity

Vancouver, British Columbia--(Newsfile Corp. - August 24, 2026) - Myriad Uranium Corp. (CSE: M) (OTCQB: MYRUF) (FSE: C3Q) ("Myriad" or the "Company") announces that it has acquired an aggregate of 46,223,258 common shares ("Rush Shares") of Rush Rare Metals Corp. ("Rush") pursuant to a statutory plan of arrangement (the "Arrangement"), as previously announced by Myriad on August 21, 2026. Under the Arrangement, Myriad issued an aggregate of 24,983,671 Myriad common shares (each, a "Myriad Share") to Rush shareholders at a deemed price of $0.42 per Myriad Share, representing aggregate consideration of $10,493,141.80. Prior to the Arrangement, Myriad did not hold any Rush Shares. Following the Arrangement, Myriad holds 46,223,258 Rush Shares, representing 100% of the issued and outstanding Rush Shares.

The Form 62-103F1 - Required Disclosure under the Early Warning Requirements associated with this news release can be obtained from Rush's profile on SEDAR+ at www.sedarplus.ca . To obtain a copy of the report, please contact Mr. Lamb of Vancouver, British Columbia, at +1.604.418.2877 or tlamb@myriaduranium.com .

About Myriad Uranium Corp.

Myriad Uranium Corp. holds a 100% interest in the Copper Mountain Uranium Project in Wyoming, USA. Copper Mountain hosts multiple historic uranium deposits and past-producing mines, including the Arrowhead Mine (approximately 500,000 lbs 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 C$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 US Department of Energy published in 1982 can be viewed here .

Myriad holds a 10% 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%-owned Breccia Pipe Project in Arizona comprises at least 23 breccia pipes that are prospective for uranium and REEs. 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.