Mr. Keith Bodnarchuk reports

COSA ANNOUNCES RESULTS OF PARTNER FUNDED AIRBORNE RADIOMETRIC SURVEY AT THE AURORA URANIUM PROJECT, ATHABASCA BASIN, SASKATCHEWAN

Cosa Resources Corp. has released results of a property-wide airborne radiometric survey at the Aurora project. Aurora is located in the southeastern Athabasca basin approximately 16 kilometres east of Cameco's Key Lake mill and historical mine. The survey and supporting work were fully financed by Traction Uranium Corp. per the option agreement between Cosa and Traction dated Feb. 10, 2026. Traction has the right to earn an up-to-80-per-cent interest in the Aurora project by sole-financing $9.15-million in exploration expenditures and completing cash and share payments.

Highlights:

• Multiple uranium-source radiometric anomalies identified in proximity to prospective basement features;
• High-resolution magnetic model significantly advances the understanding of basement geology;
• Planned fall 2026 follow-up drill program to be 100 per cent financed by Traction.

Andy Carmichael, vice-president, exploration, of Cosa, commented: "Excellent work by SPI has delivered high-resolution magnetic and radiometric data sets that have advanced our understanding of prospectivity and basement geology at Aurora. In combination with electromagnetic and gravity surveying completed by Cosa in 2024, this survey has identified or improved several target areas worthy of follow-up work. We are looking forward to commencing a planned fully partner-funded fall drilling program at Aurora later this year following completion of drilling at the company's Murphy Lake North and Darby joint ventures with Denison Mines."

Radiometric survey results

Surveying was completed by Calgary-based Special Projects Inc., an experienced airborne geophysical survey contractor with expertise in radiometric and magnetic surveying. Flown at 50-metre line spacing, the survey produced high-resolution magnetic data and identified several radiometric anomalies interpreted to be related to a uranium-bearing source. Of the radiometric anomalies identified, several are adjacent to or down ice of prospective basement features previously identified by Cosa.

Next steps

Interpretation and integration with existing geophysical and drilling data are continuing. Results will be used to guide a proposed inaugural drill program at Aurora currently scheduled to commence in fall 2026. Drilling at Aurora is planned to follow completion of Cosa's continuing drilling program at the Murphy Lake North joint venture and planned summer drilling at the Darby joint venture.

About Aurora

Aurora covers a 17-kilometre section 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 south of the GMZ. Sandstone cover is expected to be fewer than 100 metres thick in the northern third of Aurora and absent in the rest. Though no diamond drilling has been completed on the project since 1979, review of historical drill hole logs has identified several zones of hydrothermal alteration. Airborne gravity gradient and versatile transient electromagnetic surveying completed by Cosa in 2024 identified initial target areas at Aurora. The project is considered drill ready after completion of a property-wide high-resolution airborne magnetic and radiometric survey that identified or upgraded multiple target areas in July, 2026.

About Cosa Resources Corp.

Cosa Resources is a Canadian uranium exploration company operating in Northern Saskatchewan. The portfolio comprises roughly 237,000 hectares across multiple underexplored 100-per-cent-owned and Cosa-operated joint venture projects in the Athabasca basin region, the majority of which resides within or adjacent to established uranium corridors.

In January of 2025, the company entered a transformative strategic collaboration with Denison Mines 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.

The company's primary focus through the rest of 2026 will be drilling at the Murphy Lake North and Darby projects in the eastern Athabasca basin. Drilling at Murphy Lake North will follow up uranium mineralization within an extensive zone of strong structure and hydrothermal alteration at the Cyclone trend. Drilling at Darby will follow up on intersections of anomalous geochemistry, structure and zones of hydrothermal alteration from both winter 2026 drilling and historical drilling.

Cosa's award-winning management team has a 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.

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. Ground truthing of selected radiometric anomalies is planned to validate the airborne survey results and prioritize targets for the planned drilling program.

Qualified person

The company's disclosure of technical or scientific information in this press release has been reviewed and approved by Mr. Carmichael, PGeo, 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.

We seek Safe Harbor.