ATHA Energy Expands RIB North Strike to 3.4 Km, Finds Higher-Grade Zone

• Preliminary results from the final seven diamond drillholes (See July 9^th and September 8^th, 2026 news releases for other preliminary results) completed along the Mineralized RIB Corridor ("MRC") at the RIB North Discovery (Figure 1 & 2) - as part of the now concluded 2026 Angilak Exploration Program;
• 2026 drilling has now connected the RIB North and RIB East Discoveries, expanding the mineralized strike length from 1.45 km to 3.4 km, along the Eastern Limb of the MRC;
• Identification of a higher-grade, a thicker sub-zone of uranium mineralization proximal to RIBN-DD-001 was identified with drillholes found in Table 1. The sub-zone currently has an approximate 300 m strike length and 300 m down-dip extent intersecting similar thicknesses, apparent grades, and multiple stacked mineralized structures. The sub-zone area - along with the entire Eastern Limb of the MRC - remains open and unconstrained;
• Seven of seven drillholes (RIBN-DD-017 to RIBN-DD-023) intersected uranium mineralization, results are highlighted by:
  • Drillhole RIBN-DD-023: Successfully targeted uranium mineralization ~100 m down-dip from RIBN-DD-011 (which intersected 20.0 m of composite mineralization) and 150 m along strike from RIBN-DD-003 (which intersected 37.5 m of composite mineralization) identifying a thicker, and higher-grade sub-zone along the Eastern Limb of the MRC. RIBN-DD-023 intersected 19.5 m of total composite uranium mineralization² over fourteen zones from 180.0 m to 777.5 m, including 2.0 m of high-grade mineralization² (Figure 4). The highest-grade interval resulted in 2.5 m of composite mineralization² from 582.0 m to 584.5 m with an average reading of 6,865 CPS¹ and a maximum of 26,327 CPS¹ over 0.1m, including 0.7 m of high-grade mineralization²;
  • Drillhole RIBN-DD-019: Successfully targeted uranium mineralization ~850 m along strike to the northeast of RIBN-DD-001, intersecting some of the highest-grade mineralization to date at RIB North. The hole intersected 2.5 m of total composite uranium mineralization² over three zones from 319.5 m to 740.5 m, including 0.6 m of high-grade mineralization² (Figure 5). The highest-grade interval resulted in 1.5 m of composite mineralization² from 739.0 m to 740.5 m with an average reading of 17,593 CPS¹ and a maximum of 78,785 CPS¹ over 0.1 m, included within 0.6 m of high-grade mineralization²;
  • Drillhole RIBN-DD-022A: Successfully targeted uranium mineralization ~1.2 km along strike to the northeast of RIBN-DD-001. The hole intersected 5.5 m of total composite uranium mineralization² over six zones from 490.5 m to 687.5 m (Figure 10). The highest-grade interval resulted in 1.0 m of composite mineralization² from 490.5 m to 491.5 m with an average reading of 3,385 CPS¹ and a maximum of 9,846 CPS¹ over 0.1 m. Importantly, RIBN-DD-022 is located at the northeast extent of the currently tested Eastern Limb of the MRC, demonstrating that the mineralized corridor remains open and unconstrained for potential future northeast step-outs;
• Detailed strip logs, including results tables, are displayed below in Figures 4 through 10;
• Assay samples have been submitted to SRC laboratories for analyses;
• The Company anticipates releasing additional preliminary results from drillholes completed along the Lac 50 Deposit Corridor (including the Lac 50 NW Discovery area See July 8^th, 2026 news release) in the coming weeks.

Troy Boisjoli, CEO commented: "With the completion of the Company's 2026 diamond drilling campaign, I can confirm the preliminary results from the MRC are truly exceptional. In two decades as an exploration geologist exploring for uranium in the world's top jurisdictions, I am not aware of another project globally that's advanced from a single discovery hole at the end of one season, to having continuity of uranium mineralization along 3.4 km. After the maiden discovery hole at RIB North in 2025, our 2026 program at MRC was designed to test an area of mineralization that has the potential to host a Tier I deposit(s), through aggressively wide steps. The success in executing on this feat demonstrates two points: first, the Company has significantly derisked the MRC through advancing its understanding on the controls of mineralization, leading to high-confidence expansion; and, second, the metal endowment of the Angilak Uranium Project is widespread and has the potential to be Canada's next uranium district.

The Company is working with subject matter experts on the interpretation that uranium deposits located within the Angilak Uranium Project area are the result of an Orogenic Uranium-Rich Deposit Model - the first of its kind to be identified globally. The plumbing systems and discovery potential along Orogenic Belts are well documented within the gold sector, and a uranium rich system would be something completely unprecedented. The Company plans to document the foundation for this interpretation in the coming weeks, while also releasing additional diamond drilling results from one of our other mineralized corridors at Angilak, the Lac 50 Deposit Corridor. We have a corporate motto at ATHA, "Only do real things", and with the success of the 2026 Angilak Exploration Program, I can say for certain, Angilak is very real, and we are just getting started".