Alamos Gold Reports Mineral Reserves and Resources for the Year-Ended 2025

Global Mineral Reserves Increase 32% with Grades also Increasing 5%, Driven by 125% Growth in High-Grade Mineral Reserves at Island Gold All amounts are in United States dollars, unless otherwise stated. TORONTO, Feb. 17, 2026 (GLOBE NEWSWIRE) - Alamos Gold Inc. ( TSX:AGI; NYSE:AGI ) (“Alamos” or the “Company”) today reported its updated Mineral Reserves and Resources as of December 31, 2025. For a detailed summary by asset, refer to the tables below. Highlights Global Proven and Probable Mineral Reserves increased 32% to 15.9 million ounces of gold (265 million tonnes (“mt”)) with grades also increasing 5% to 1.87 grams per tonne of gold (“g/t Au”). This was driven by the successful conversion of a large portion of the Island Gold District’s Mineral Resource base into Mineral Reserves Island Gold’s Mineral Reserves more than doubled , increasing 125% to 5.1 million ounces (15.1 mt grading 10.61 g/t Au), reflecting the conversion of existing and newly defined Mineral Resources to