Mr. Scott Parsons reports

ALAMOS GOLD FILES TECHNICAL REPORT FOR THE ISLAND GOLD DISTRICT BASE CASE LIFE OF MINE PLAN

Alamos Gold Inc. has filed a technical report for the base case life-of-mine plan completed on the Island Gold district operation, located in Ontario, Canada.

The report was prepared in accordance with National Instrument 43-101, Standards for Disclosure for Mineral Projects, and supports the disclosure outlined in Alamos's news release dated June 23, 2025. The report is available on the Alamos website, and will be available under the company's profile on SEDAR+ and EDGAR.

About Alamos Gold Inc.

Alamos is a Canadian-based intermediate gold producer with diversified production from three operations in North America. This includes the Island Gold district and Young-Davidson mine in Northern Ontario, Canada, and the Mulatos district in Sonora state, Mexico. Additionally, the company has a strong portfolio of growth projects, including the phase 3-plus expansion at Island Gold and the Lynn Lake project in Manitoba, Canada. Alamos employs more than 2,400 people and is committed to the highest standards of sustainable development. The company's shares are traded on the Toronto Stock Exchange and New York Stock Exchange under the symbol AGI.