Cosa Appoints David Cates, President and CEO of Denison Mines, as Strategic Advisor

Cosa Resources Corp. (TSXV: COSA) (OTCQB: COSAF) (FSE: SSKU) ("Cosa" or the "Company") is pleased to report it has appointed Mr. David Cates as Strategic Advisor to the Company. Mr. Cates is currently a Director, President and CEO of Denison Mines Corp. (TSX: DML) (NYSE American: DNN) ("Denison"). Cosa owns a 70% interest in and operates multiple joint ventures with Denison Mines: Murphy Lake North, Darby, and Packrat.

Keith Bodnarchuk, President and CEO of Cosa, commented: "I have known and respected David for almost 15 years, having previously worked for him during my time at Denison. Since finalizing the transformative property acquisition with Denison earlier this year, we have been fortunate to work closely with David in support of the growing collaboration between Cosa and Denison. We thank David for his willingness to join us in the official capacity of Strategic Advisor, and we look forward to continuing to work together with David and the entire Denison team as we prepare for and commence an exciting exploration program in early 2026."

David Cates, President and CEO of Denison and Strategic Advisor to Cosa, commented: "Cosa's leadership and technical team are amongst the best in the uranium exploration sector, and are well known to me from their past time working with Denison. It has been energizing to reconnect with the Cosa team since our collaboration commenced early this year. With the next round of exploration at the Darby and Murphy Lake North joint venture properties planned for the winter of 2026, it is an exciting time for me to join the Cosa team in an official capacity. With Denison's core focus on completing the final stages of permitting and future construction of our Phoenix In-Situ Recovery uranium mine, I am pleased to support Cosa's complementary exploration efforts in the pursuit of a new meaningful uranium discovery in the eastern portion of the Athabasca Basin."

Strategic Advisor

Mr. Cates is a Chartered Professional Accountant (CPA, CA) and holds Master of Accounting (MAcc) and Honours Bachelor of Arts (BA) degrees from the University of Waterloo. Mr. Cates has extensive expertise in the Canadian and international uranium mining industry from nearly two decades of senior management and financial experience in various roles with Denison. Mr. Cates was appointed President & CEO of Denison in 2015, having previously served as the company's Vice President, Finance & Tax and Chief Financial Officer. Prior to joining Denison in 2008, Mr. Cates held positions at Kinross Gold Corp. and PwC LLP.

Leading Denison through the innovative deployment of the ISR mining method at its flagship Wheeler River project, as well as project permitting and finance efforts, Mr. Cates' experience is unparalleled. As an Advisor to Cosa, Mr. Cates offers invaluable insight into the mine development process, community relations efforts, corporate strategy and finance, as well as the overall uranium market.

About Cosa Resources Corp.

Cosa Resources is a Canadian uranium exploration company operating in northern Saskatchewan. The Company's project portfolio comprises roughly 237,000 ha across multiple underexplored 100% owned and Cosa-operated joint venture projects in the Athabasca Basin region, the majority of which reside within or adjacent to established uranium corridors.

In January of 2025, the Company entered a transformative strategic collaboration with Denison that has secured Cosa access to several additional highly prospective eastern Athabasca uranium exploration projects. As Cosa's largest shareholder, Denison gains exposure to Cosa's potential for exploration success and its pipeline of uranium projects.

Cosa's award-winning management team has a track record of success in Saskatchewan. In 2022, members of the Cosa team were awarded the AME Colin Spence Award for the discovery of the Hurricane uranium deposit. Cosa personnel led teams or had integral roles in the discovery of Denison's Gryphon deposit and 92 Energy's GMZ zone and held key roles in the founding of both NexGen and IsoEnergy.

The Company's focus throughout 2026 is expected to be exploration drilling at the Darby and Murphy Lake North projects in the eastern Athabasca Basin. Both projects are operated by Cosa and are 70/30 joint ventures between Cosa and Denison respectively. Drilling at Darby is planned to test priority targets identified by thorough review of historical data and drill core and are planned to target areas with anomalous uranium, clay alteration, and historical mineralization intersected nearby. Drilling at Murphy Lake North is expected to follow up 2025 drilling which intersected broad zones of structurally controlled alteration over roughly 2 kilometres of strike length.

Marketing Services Agreement

Additionally, the Company announces it has entered into a Marketing Services Agreement (the "Agreement") with Oak Hill Financial Inc. ("Oak Hill"), an arms length party to the Company. Oak Hill is to provide certain marketing, investor relations, and advisory services to Cosa with the primary objective of increasing stakeholder communication and expanding market awareness of the Company and its ongoing exploration operations (the "Services").

No securities or other share-based incentives of Cosa are being granted to Oak Hill under the terms of the Agreement. To the knowledge of Cosa, neither Oak Hill nor any of its directors, officers, or employees currently own any securities of Cosa. Oak Hill has committed to comply with all applicable securities laws and the policies of the TSX Venture Exchange (the "TSXV") in providing the Services.

The Agreement is subject to TSXV approval and shall be for an initial two-month term, for a monthly fee of $10,500, plus applicable taxes, which may be automatically renewed for successive one-month periods.

Oak Hill is a provider of investor relations and capital markets advisory services with an office located at 2 Bloor Street West, Suite 2900, Toronto, Ontario, M4W 3E2.

Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.

Cautionary Statements

This press release contains forward-looking information within the meaning of Canadian securities laws (collectively "forward-looking statements"). Forward-looking statements are typically identified by words such as: believe, expect, anticipate, intend, estimate, plans, postulate and similar expressions, or are those, which, by their nature, refer to future events. All statements that are not statements of historical fact are forward-looking statements. These forward-looking statements or information may relate to anticipated exploration, development and/or expansion activities, including exploration of the Company's current Projects; the collaboration with Denison, including the Joint Venture, and the anticipated benefits thereof; and the outlook regarding Cosa's business plans and objectives.

Such forward-looking information and statements are based on numerous assumptions, including among others, that the results of planned exploration activities are as anticipated, the cost of planned exploration activities are as anticipated, that general business and economic conditions will not change in a material adverse manner, that financing will be available if and when needed and on reasonable terms, that third party contractors, equipment and supplies and governmental and other approvals required to conduct Cosa's planned exploration activities will be available on reasonable terms and in a timely manner. Although the assumptions made by Cosa in providing forward-looking information or making forward-looking statements are considered reasonable by management at the time, there can be no assurance that such assumptions will prove to be accurate.

By their nature, forward-looking statements involve known and unknown risks, uncertainties and other factors which may cause our actual results, performance or achievements, or other future events, to be materially different from any future results, performance or achievements expressed or implied by such forward-looking statements. Such factors and risks include, among others: Cosa may require additional financing from time to time in order to continue its operations which may not be available when needed or on acceptable terms and conditions acceptable; Cosa may not be able to maintain compliance with its contractual obligations with third parties; Cosa may not be able to maintain compliance with extensive government regulation applicable to its operations; domestic and foreign laws and regulations could adversely affect Cosa's business and results of operations; the stock markets have experienced volatility that often has been unrelated to the performance of companies and these fluctuations may adversely affect the price of Cosa's securities, regardless of its operating performance; the ongoing military conflict in Ukraine, and other risk factors set out in Cosa's public disclosure documents.

The forward-looking information contained in this news release represents the expectations of Cosa as of the date of this news release and, accordingly, is subject to change after such date. Readers should not place undue importance on forward-looking information and should not rely upon this information as of any other date. Cosa does not undertake any obligation to update these forward-looking statements in the event that management's beliefs, estimates or opinions, or other factors, should change.

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