Rush Rare Metals Confirms Myriad Uranium's 75% Copper Mountain Earn-In

Vancouver, British Columbia--(Newsfile Corp. - December 8, 2025) - Rush Rare Metals Corp. (CSE: RSH) ("Rush" or the "Company) is pleased to confirm that Myriad Uranium Corp. ("Myriad") has earned a 75% interest in the Copper Mountain Uranium Project in Wyoming, USA by spending over $5.5 million on eligible expenditures at Copper Mountain under the property option agreement dated October 18, 2023, as amended, between Myriad and Rush.

Peter Smith, Rush's CEO, commented, "Congratulations to Myriad for hitting this milestone. Both sides continue to discuss prospects for a merger, and we intend to explore this in the coming weeks, and otherwise the respective teams will commence negotiation of a joint venture agreement, which we will negotiate, if necessary, using our best and commercially reasonable efforts as stipulated in the option agreement. Obviously we are thrilled that Copper Mountain has turned into the tremendous asset it has, thanks both to some early hard work and good fortune by the Rush team in identifying the prospect and uncovering some excellent historical data, and some truly outstanding work by the Myriad team in developing and promoting the asset into one of North America's largest and most exciting uranium properties."

About Rush Rare Metals Corp.

Rush Rare Metals Corp. is a mineral exploration company focused on its Boxi Property located in the Province of Québec, Canada. Rush also owns the Copper Mountain Project located in Wyoming, USA, which it has optioned to Myriad Uranium Corp. Rush currently has a 100% interest in Boxi, and a 25% interest in Copper Mountain, which has been the subject of an earn-in agreement with Myriad. For further information, please refer to Rush's disclosure record on SEDAR+ (www.sedarplus.ca) or contact Rush by email at psmith@rushraremetals.com or by telephone at 778.999.7030, or refer to Rush's website at www.rushraremetals.com.

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Mineralization hosted on adjacent or nearby properties is not necessarily indicative of mineralization hosted on the Company's properties. Certain statements in this news release are forward-looking statements, including with respect to future plans, and other matters. Forward-looking statements consist of statements that are not purely historical, including any statements regarding beliefs, plans, expectations or intentions regarding the future. Such information can generally be identified by the use of forwarding-looking wording such as "may", "expect", "estimate", "anticipate", "intend", "believe" and "continue" or the negative thereof or similar variations. The reader is cautioned that assumptions used in the preparation of any forward-looking information may prove to be incorrect. Events or circumstances may cause actual results to differ materially from those predicted, as a result of numerous known and unknown risks, uncertainties, and other factors, many of which are beyond the control of the Company, including but not limited to, business, economic and capital market conditions, the ability to manage operating expenses, and dependence on key personnel. Such statements and information are based on numerous assumptions regarding present and future business strategies and the environment in which the Company will operate in the future, anticipated costs, and the ability to achieve goals. Factors that could cause the actual results to differ materially from those in forward-looking statements include, the continued availability of capital and financing, litigation, loss of key employees and consultants, and general economic, market or business conditions. Forward-looking statements contained in this news release are expressly qualified by this cautionary statement. The reader is cautioned not to place undue reliance on any forward-looking information.

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