Cosa Announces Partner-Funded Drilling Results from the Aurora Uranium Project, Athabasca Basin, Saskatchewan

Vancouver, British Columbia--(Newsfile Corp. - October 19, 2026) - Cosa Resources Corp. (TSXV: COSA) (OTCQB: COSAF) (FSE: SSKU) ("Cosa" or the "Company") is pleased to announce drilling results from the Aurora project ("Aurora" or the "Project"). Aurora is located in the southeastern Athabasca Basin approximately 16 kilometres east of Cameco's Key Lake mill and historical mine. Drilling was fully funded by Traction Uranium Corp. (CSE: TRAC) (OTCQB:TRCTF) (FSE: Z1K) ("Traction") per the option agreement (the "Agreement") between Cosa and Traction dated 10 February 2026. Traction has the right to earn up to an 80% interest in the Aurora project by sole-funding $9.15 million in exploration expenditures and completing cash and share payments. Highlights Drilling followed-up two conductive anomalies located up-ice from uranium-source radiometric anomalies. Graphitic faulting, a common feature of Athabasca uranium deposits, intersected at both targets. Drilling was fully funded by Traction as part of a multi-year earn-in; Cosa is the operator. Andy Carmichael, VP Exploration of Cosa, commented: "The first intersection of faulted graphitic basement at Aurora not only significantly enhances the project's prospectivity but also validates the use of modern geophysical techniques to identify new target areas. With one of several target areas now confirmed to host favourable geology in an exceptional location just 16 kilometres east of Cameco's Key Lake uranium mill, we look forward to advancing the project alongside Traction. Follow up work is likely to include advanced target generation work and a larger drill program in 2027." Core Drilling Program Two drill holes totaling 541 metres were completed in the southern portion of Aurora. Drilling targeted two conductive anomalies in the A1 target area identified by a 2024 Versatile Time-Domain Electromagnetic (VTEM) survey and located up-ice of uranium-source radiometric anomalies identified by an airborne Gamma Ray Spectrometer (GRS) survey funded by Traction in 2026. Both drill holes intersected interpreted metasedimentary basement including graphitic units hosting intervals of brittle faulting with increased graphite content. AU26-01 also intersected granitic gneiss interpreted to overlie the metasedimentary unit, a common structural contrast often associated with uranium deposits in the eastern Athabasca. Neither drill hole intersected sandstone as both were located outside the rim of the Athabasca Basin. While significant hydrothermal alteration was not intersected, this is the first known intersection of faulted graphitic basement rocks at Aurora. This result significantly upgrades the prospectivity of the Project and demonstrates the utility of modern geophysical coverage to better identify target areas. Geochemical results are pending. Planning is underway for additional follow-up in 2027 which is likely to include additional target generation work and an expanded drill program. About Aurora Aurora covers a 17-kilometre length of the southeastern rim of the Athabasca Basin located 16 kilometres east of Key Lake, the site of an operational uranium mill and past producing uranium mine, and 40 kilometres southwest of the GMZ (Figure 1). Sandstone cover is less than 100 metres thick in the northern third of Aurora and absent in the remainder. Airborne gravity gradient and Versatile Transient Electromagnetic (VTEM) surveying completed by Cosa in 2024 identified initial target areas at Aurora (Figure 2). A property-wide high-resolution airborne magnetic and radiometric survey identified or upgraded multiple target areas in July 2026. Figure 1 - The Aurora Project Location To view an enhanced version of this graphic, please visit: https://images.newsfilecorp.com/files/9865/319613_b2fc7101241de94e_003full.jpg Figure 2 - The Aurora Project Drill Target Areas To view an enhanced version of this graphic, please visit: https://images.newsfilecorp.com/files/9865/319613_b2fc7101241de94e_004full.jpg About Cosa Resources Corp. Cosa Resources is a Canadian uranium exploration company operating in northern Saskatchewan. The 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 Mines (TSX: DML) (NYSE American: DNN) that has secured 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 held key roles in the founding of both NexGen and IsoEnergy. About Traction Uranium Corp. Traction Uranium Corp. (CSE: TRAC) (OTCQB: TRCTF) (FSE: Z1K) is in the business of mineral exploration and the development of discovery prospects in Canada, including its uranium project in the world-renowned Athabasca Region. Technical Disclosure Historical drilling results from Aurora are available within the Saskatchewan Mineral Assessment Database references 74H-0024, 74H07-0017, and 74H07-0031. Confirmatory relogging of these drill holes has not been completed as the core storage locations are unknown or have been destroyed by wildfire. Qualified Person The Company's disclosure of technical or scientific information in this press release has been reviewed and approved by Andy Carmichael, P.Geo., Vice President, Exploration for Cosa. Mr. Carmichael is a Qualified Person as defined under the terms of National Instrument 43-101. This news release refers to neighbouring properties in which the Company has no interest. Mineralization on those neighbouring properties does not necessarily indicate mineralization on the Company's properties. Contact Keith Bodnarchuk, President and CEO [email protected] +1 888-899-2672 (COSA) 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. To view the source version of this press release, please visit https://www.newsfilecorp.com/release/319613