IsoEnergy Commences 8,000 Metre Summer Drill Program at the Larocque East Project, Athabasca Basin

Executive Summary

• IsoEnergy has commenced its 2026 summer exploration program at the Larocque East Project in the Athabasca Basin, planning approximately 8,000 meters of diamond drilling across up to 20 holes.
• The program primarily targets the Hurricane South Trend to follow up on high-grade winter 2026 results, focusing on step-outs and along-strike extensions to test the scale of newly identified mineralization.
• The project hosts a significant high-grade uranium resource (48.6 Mlb U3O8 Indicated) and benefits from shallow mineralization (~325 m depth) and proximity to the McClean Lake mill, with additional exploration planned across four early-stage projects.

Key Details

• Drilling Program Scope: ~8,000 m of diamond drilling planned across up to 20 holes.
• Primary Target: Hurricane South Trend, focusing on step-outs from hole LE26-248 and along-strike extensions east of the deposit.
• Winter 2026 Drill Intercepts:
• Hole LE26-248: 4.21% U3O8 over 3.5 m (including 11.61% U3O8 over 1.0 m) in the newly reinterpreted L Fault Zone.
• Hole LE26-234: 2.75% U3O8 over 0.5 m.
• Hole LE26-243: 1.75% U3O8 over 0.5 m (~525 m east of the current resource envelope).
• Historical High-Grade Reference: 20.4% U3O8 over 6.5 m in 2021 hole LE21-107 along the J-K fault zone.
• Current Mineral Resource: 48.6 Mlb U3O8 at 34.5% U3O8 Indicated; 2.7 Mlb U3O8 at 2.2% U3O8 Inferred.
• Project Location & Infrastructure: Located ~40 km northwest of the McClean Lake mill; features relatively shallow mineralization at ~325 m depth.
• Additional Exploration Activities: Airborne MobileMT surveys planned for Trident, Ranger, and western Larocque East projects. Ground prospecting and RAMP anomaly investigations planned for Evergreen and East Rim projects in late summer.
• Qualified Person: Dr. Dan Brisbin, P.Geo., Vice President of Exploration.

Notable Quotes

• Dan Brisbin, Vice President of Exploration: "Following the high-grade results returned from the winter program along the Hurricane South Trend, our team has mobilized for an aggressive summer follow-up. The LE26-248 intersection opened an underexplored corridor along the southernmost fault strands of the Hurricane fault zone, and this 8,000 m program is designed to test the scale of that opportunity along strike, and to test additional targets within the broader Hurricane South Trend"