Alamos Gold Acquires Trillium Mining Consolidating Large Land Package Adjacent to Island Gold Mine TORONTO, Dec. 17, 2020 — Alamos Gold Inc. ( TSX:AGI; NYSE:AGI) (“Alamos” or the “Company”) is pleased to announce that it has completed an agreement to acquire Trillium Mining Corp. (“Trillium”) for cash consideration of C$25 million. Trillium holds a large land package comprised of 5,418 hectares (“ha”) directly adjacent to, and along strike from the Island Gold Deposit within the Michipicoten Greenstone Belt. The acquisition has significantly expanded the Company’s land package around the Island Gold mine to 14,929 ha, a 57% increase (see Figures 1 and 2). This newly acquired land includes significant exploration potential in proximity to existing high-grade Mineral Resources and regionally.