ATHA Energy Announces Additional Results from Rib North Discovery Expanding Continuity of Mineralization from 300 metres to 1.45 Kilometres - Results Include RIBN-DD-011 Intersecting 20 m of Composite Uranium Min Including 1.3 m of High-Grade

Atha Energy Corp. (SASK) released preliminary downhole-gamma results on September 8, 2026, from seven additional step-out holes at RIB North. These results are part of the 2026 Angilak uranium program in Nunavut and represent radiometric CPS readings rather than uranium assays.

The company reported the following key intervals:

• RIBN-DD-011: 20.0 m total composite uranium mineralization over fifteen zones from 494.0 m to 700.5 m, including 1.3 m of high-grade mineralization. Highest-grade interval: 1.5 m from 661.5 m to 663.0 m averaging 8,453 CPS with a max of 26,680 CPS, including over 0.6 m of high-grade.
• RIBN-DD-013A: 13.0 m total composite uranium mineralization over five zones from 544.0 m to 673.0 m. Widest interval: 4.0 m from 544.0 m to 548.0 m averaging 1,013 CPS with a max of 6,855 CPS.
• RIBN-DD-014: 7.0 m total composite uranium mineralization over six zones from 237.0 m to 573.0 m. Highest-grade interval: 1.5 m from 571.5 m to 573.0 m averaging 4,275 CPS with a max of 20,138 CPS.
• RIBN-DD-010: 3.0 m total composite uranium mineralization over four zones from 412.5 m to 576.5 m. Widest interval: 1.0 m from 540.5 m to 541.5 m averaging 718 CPS with a max of 1,407 CPS.
• RIBN-DD-012, RIBN-DD-015, and RIBN-DD-016A are reported as intersecting mineralization, but no numerical intervals are given in the text; the release references striplog figures.

According to the release, all seven holes intersected uranium mineralization, allowing continuity to be traced over 1.45 km along the eastern limb of the Mineralized RIB Corridor. The secondary western-limb horizon was followed up with RIBN-DD-010. The system remains open in all directions. All intercepts are core length; true thickness is not determined.

Atha Energy Corp. (SASK) is currently in the exploration stage, operating as a pre-revenue company with a going-concern warning. The firm is fully funded for its current program following a C$63 million financing completed in February 2026, building on Q1 2026 cash reserves of C$56.7 million.

Prior to this release, the market had already reacted to several key developments, including the 2025 RIB North discovery with assays up to 8.16% U3O8 and results from July 9, 2026, which showed 300 m of continuity and the 37 m composite RIBN-DD-003 interval. Consequently, the stock rallied from roughly C$1.08 in early July to a 52-week high of C$1.40 on August 27, before pulling back to C$1.23 by September 4.

This latest release confirms a successful, continuing step-out program at RIB North, with all seven holes hitting targets and the strike length expanding to 1.45 km. While the results are not disappointing—RIBN-DD-011 recorded a maximum of 26,680 CPS and 0.6 m of high-grade—the announcement does not provide the assay-grade or true-width information that would alter the fundamental outlook. The findings are considered in-line with market expectations for this program.

Atha Energy Corp. is a Canadian uranium exploration company whose principal asset is the 100 percent-owned Angilak Uranium Project in Nunavut. The company also holds CMB Discoveries in Labrador, the GMZ basement-hosted discovery in the Athabasca Basin, and a 10 percent carried interest in Athabasca projects operated by NexGen Energy and IsoEnergy.

There are no NI 43-101 mineral resources or reserves. The Lac 50 project has a conceptual exploration target of 60.8 to 98.2 million pounds U3O8 at 0.37 to 0.48 percent U3O8, which is not a resource. The current 2026 program is the largest in company history and was funded by the February 2026 C$63 million financing.