Greenridge Exploration Announces Commencement of Winter 2026 Drilling Program with Denison Mines at the Hook-Carter Uranium Project in the Athabasca Basin, Saskatchewan

Executive Summary

• Greenridge Exploration and partner Denison Mines have commenced the 2026 winter drilling program at the Hook‑Carter Uranium Project, targeting up to eight diamond holes (~4,600 m).
• The program focuses on the underexplored Derkson Trend, a northeast‑southwest conductive corridor extending the prolific Patterson Lake Corridor.
• Drilling is expected to be completed by end‑March 2026, with a temporary work camp established on site and ongoing collaboration with Indigenous communities.

Key Details

• Program Scope: Up to 8 diamond drill holes totaling ~4,600 m of core drilling.
• Target Definition: Targets were selected using detailed 2025 ground geophysical surveys integrated with historic exploration data to identify key geological indicators of a mineralizing system.
• Geological Focus: Derkson Trend – a northeast‑southwest trending conductive corridor east of the Patterson Lake Corridor, previously underexplored at Hook‑Carter. Historical hole DER‑04 intersected 0.24 % U₃O₈ over 2.5 m (120.5–122.5 m depth).
• Project Ownership: Greenridge holds a 20 % interest; Denison Mines holds 80 % and serves as operator.
• Timeline: Drilling commenced in February 2026 with an anticipated completion date by the end of March 2026.
• Logistics: Operations are based from a temporary work camp on the project site.
• Indigenous Relations: Denison has committed to collaborative engagement with Indigenous peoples and communities, adhering to its Indigenous Peoples Policy to avoid adverse impacts.
• Joint‑Venture Background:
• 2016: ALX Resources sold an 80 % interest in Hook‑Carter to Denison for 7.5 M Denison shares; retained 20 % interest.
• 2024 amendment allowed ALX (now owned by Greenridge) to increase its stake to 25 % by funding an additional $3.0 M of exploration by November 2026.
• Qualified Person: Sean Hillacre, M.Sc., P.Geo., reviewed and approved the technical information in accordance with NI 43‑101.

Notable Quotes

“The 2026 drilling Program at Hook‑Carter represents the culmination of years of exploration efforts leading to the target areas developed by the joint venture’s work in 2025. The Company is pleased to be working with Denison on one of the most exciting uranium trends in the history of Athabasca Basin exploration.” – Russell Starr, Chief Executive Officer, Greenridge Exploration Inc.