ATHA Energy Confirms New High-Grade Discovery at Angilak Project - Rib North, Maiden Hole Returns Assays with 34.7 m of Total Composite Uranium Mineralization, Including 13.6 m Grading 0.53% U3O8, 1.1 m Grading 4.81% U3O8, and Grades Up to 8.16% U3O8

HIGHLIGHTS

• All 2025 mineralized drill core samples have been submitted to the Saskatchewan Research Council (SRC) Geoanalytical Laboratory for analysis. The Company anticipates disclosing all remaining assay results within Q4 2025.

Troy Boisjoli, CEO commented: "During my career as an exploration geologist I have had the pleasure of working in some of the world's premier regions for discovery of uranium mineralization - such as the Patterson Lake and Rabbit Lake corridors. With that experience, I cannot recall a maiden hole into a target area that returned of an intersection this significant, with assays surpassing our expectations. The grades and thicknesses, the style of mineralization, along with the pathfinder elements and geophysical signatures are all present at the RIB North Discovery. The confirmation of the MRC as an important corridor at the Angilak project - in addition to Lac 50 Deposit Trend, and numerous other showings - reinforces the blue-sky potential that Angikuni Basin could be the next Athabasca Basin. At a time when the Canadian Government is looking to advance mineral resource projects - and strengthen infrastructure in the north. The Angilak Uranium Project is just getting started."

Cliff Revering, VP Exploration added: "We are extremely pleased with the recently received assay results from RIBN-DD-001, our first drill hole into this target area, which have exceeded the extent and scale of uranium mineralization indicated by our preliminary downhole gamma probe data. Intersecting 34.7 metres of composite uranium mineralization, including a 1.1-metre interval averaging 4.81% U₃O₈, clearly demonstrates the significant scale and high-grade potential present in this zone.

The Mineralized RIB Corridor, anchored by the results of RIBN-DD-001, represents an exciting new discovery along the RIB-Nine Iron Corridor within the Angikuni Basin and reinforces the exploration thesis we have pursued since acquiring the Angilak Project in 2024. Our 2025 drilling, combined with the 3D inversion model from the 2024 MMT survey across the northern Angikuni Basin and Lac 50 Deposit areas, has now identified numerous highly prospective trends and untested targets, positioning us for a compelling 2026 exploration campaign.

Our conviction that the Angikuni Basin is an emerging uranium district with strong potential for additional high-grade uranium discoveries continues to grow as we advance our exploration strategy."

VANCOUVER, BC / ACCESS Newswire / November 20, 2025 /ATHA Energy Corp. (TSXV:SASK)(FRA:X5U)(OTCQB:SASKF) ("ATHA" or the "Company"), is pleased to announce assay results from the maiden drillhole at the RIB North Discovery, completed as part of the 2025 Angilak Exploration Program at its 100%-owned Angilak Uranium Project in Nunavut, Canada. Assay results from RIBN-DD-001 represent the best exploration hole to date at the Angilak Project, intersecting a total of 34.7 m of composite uranium mineralization¹ over seven zones, from 287 m to 439.9 m depth. The highest grade and widest continuous interval of mineralization was intersected from 426.3 to 439.9 m depth, grading 0.53% U₃O₈ including 8.16% U₃O₈ over 0.5 m (Figure 4).

The RIB North Discovery is situated along the 4.4 km eastern limb of the Mineralized RIB Corridor ("MRC") - a 12 km trend containing stacked structural anomalies, identified using 3D EM Inversion modeling. During the 2025 Angilak Exploration Program these anomalies were drill tested, resulting in a 100% success rate of intersecting uranium mineralization, and the discovery of four new mineralized areas: RIB East, West, North and South.

The nearest drilling to RIBN-DD-001 occurred ~1.4 km along strike at the RIB East Discovery area and 1.8 km along strike at the RIB West Discovery area - both holes intersected uranium mineralization, however, the extension of the structural corridor hosting RIB North mineralization remains untested and highly prospective (Figures 1, 2, & 3).

Figure 1: Angilak Project Area - 2025 Exploration Target Area (Black Rectangles), Mineralized RIB Corridor (Red Rectangles), & Mapped Historic Mineralized Showings

Figure 2: 2025 Angilak Exploration Program - EM Inversion Model & Drill Collar Locations from MRC, along the RIB-Nine Iron Trend.

Figure 3: 2025 Angilak Exploration Program - Isometric schematic of the MRC, displaying EM Inversion model and 2025 drilling.

Table 1: 2025 Angilak Exploration Program Drill Collar Information