Alamos Gold Announces Island Gold District Base Case Life of Mine Plan Outlining One of the Largest and Lowest-Cost Gold Mines in Canada with Significant Upside

All amounts are in United States dollars, unless otherwise stated.

TORONTO, June 23, 2025 (GLOBE NEWSWIRE) --  Alamos Gold Inc. (TSX:AGI; NYSE:AGI) (“Alamos” or the “Company”) today reported results of the Base Case Life of Mine Plan (“Base Case LOM Plan”) completed on the Island Gold District operation, located in Ontario, Canada. The Base Case LOM Plan integrates Island Gold and Magino as one consolidated long-life operation that is expected to become one of the largest, lowest-cost, and most profitable gold mines in Canada. An Expansion Study is expected to be released in the fourth quarter of 2025 detailing the significant upside potential within the Island Gold District beyond the Base Case LOM Plan.

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