Mr. Keith Bodnarchuk reports

COSA EXPANDS ORBIT PROJECT, IDENTIFIES COINCIDENT PATHFINDER GAS OCCURRENCES, ATHABASCA BASIN, SASKATCHEWAN

Cosa Resources Corp. has expanded its 100-per-cent-owned Orbit project to cover coincident radon, helium and hydrogen anomalies and electromagnetic conductors. Orbit is located 21 kilometres south of Cameco's Key Lake mill and historical Key Lake mine in the southeastern Athabasca basin region, Saskatchewan.

Highlights:

• New claims cover radon, helium and hydrogen occurrences and EM conductors.
• Orbit is drill ready with near-surface drill targets in multiple areas.
• Orbit covers over 15,000 hectares with no encumbrances and no sandstone cover.
• Planning is under way for follow-up in 2026.

Andy Camichael, vice-president of exploration, commented: "With no sandstone to inhibit the migration of pathfinder gases, we view remote sensing as having great potential to aid exploration at Orbit. Remote sensing identified two zones of coincident anomalous radon, helium and hydrogen, including one zone later covered by targeted staking. Recent staking also added three kilometres of drill-ready conductive strike length. We're pleased to have bolstered the target inventory of a project located near highways, power lines, permanent camp facilities and the Key Lake uranium mill. Planning is under way for follow-up in 2026."

Orbit expansion and remote sensing

Cosa undertook remote sensing work to evaluate the area for radon, helium and hydrogen, which can be important pathfinders for uranium exploration, as they may be produced by the radioactive decay of uranium.

Two areas of coincident radon, helium and hydrogen were identified by remote sensing work. The ORS-1 target is in the northern portion of Orbit, measures up to 1,000 by 1,000 metres, and is predominantly located on land with portions extending onto small lakes. ORS-2 is located within newly staked lands, measures up to 750 by 600 metres and is within a small lake with portions extending onto land. Both the ORS-1 and ORS-2 targets are within magnetic low zones, indicating they may be underlain by prospective metasedimentary basement rocks.

Recent staking also covered three kilometres of strike length of subparallel, northeast-trending EM conductors defined by 2017 ground surveying. Several of these conductive features extend to the northeastern limit of the historical survey area, suggesting potential to extend these features with additional surveying.

Next steps

Follow-up work is expected to include ground-based gas surveys for radon, helium and hydrogen. As the ORS-1 and ORS-2 anomalies lie outside of the 2024 airborne EM and gravity gradient survey areas, additional airborne surveying may also be completed.

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 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 into 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 long record of success in Saskatchewan. In 2022, members of the Cosa team were awarded the AME Colin Spence award for their previous involvement in discovering IsoEnergy's Hurricane deposit. Prior to Hurricane, 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 core focus throughout 2025 is drilling at the Murphy Lake North joint venture. Murphy Lake North is a 70/30 joint venture between Cosa and Denison respectively, and is located at the northern end of the Larocque Lake trend. The project is within three kilometres of and on trend with the Hurricane deposit. Drilling completed by Cosa in 2025 identified multiple zones of strong sandstone structure and alteration and weakly elevated radioactivity underlain by large graphitic structures rooted in basement rocks. The company is planning additional follow-up work in 2026.

Technical disclosure

Historical geophysical results for Orbit were sourced from the Saskatchewan mineral assessment database. SMAD sources relied on for this release include 74A13-0036 and MAW02156. Verification of historical geophysical results was limited to reviewing historical reports and interpretations written by professional geoscientists and confirming the locations of geophysical survey grids from air photos.

Qualified person

The company's disclosure of technical or scientific information in this press release has been reviewed and approved by Andy Carmichael, PGeo, vice-president, exploration, for Cosa. Mr. Carmichael is a qualified person as defined under the terms of National Instrument 43-101.

We seek Safe Harbor.