Alamos Gold Provides Exploration Update Across Key Projects Including Extending Mineralization Beyond Mineral Reserves At Lynn Lake and Intersecting High-Grade Mineralization At Qiqavik

Alamos Gold Inc. reported new results from its 2025 exploration program at the Lynn Lake project in Manitoba, and the Qiqavik Gold project, located in Nunavik, Quebec, Canada. Drilling continues to extend and define new gold mineralization at both projects. Drilling over the past year has been focused on the Linkwood and Burnt Timber (?BT?) satellite deposits.

As outlined in the February 2025 internal study (?2025 Study?), the Linkwood and BT deposits are expected to leverage the infrastructure being constructed for the Lynn Lake project and provide a source of additional mill feed. This is expected to extend the mine life of the combined Lynn Lake project, increase longer term production rates by deferring the processing of lower grade stockpiles, and enhance its economics. Exploration drilling over the past year has successfully extended mineralization beyond Mineral Reserves utilized in the 2025 Study at both Linkwood and BT.

This is expected to contribute to another year of Mineral Reserve and Mineral Resource growth at both deposits, highlighting further upside to the combined project Linkwood: 21.70 g/t Au (3.85 g/t Au cut) over 5.25 m (25LWX082) including; 231.00 g/t Au (40.00 g/t Au cut) over 0.48 m. 9.93 g/t Au (5.26 g/t Au cut) over 7.26 m (25LWX081) including; 83.20 g/t Au (40.00 g/t Au cut) over 0.78 m. 7.86 g/t Au (6.00 g/t Au cut) over 5.83 m (25LWX087) including; 17.60 g/t Au over 0.27 m; and 23.34 g/t Au over 1.41 m. 3.48 g/t Au over 8.73 m (25LWX081); and 1.57 g/t Au over 15.62 m (25LWX086) including; 9.59 g/t Au over 0.45 m. East Foster: 27.68 g/t Au (3.38 g/t Au cut) over 6.26 m (25LWX070) including; 356.00 g/t Au (40.00 g/t Au) over 0.48 m. 1.05 g/t Au over 16.19 m (25LWX066); and 3.19 g/t Au over 5.12 m (25LWX072) including; 16.45 g/t Au over 0.98 m. Burnt Timber: 2.77 g/t Au over 13.04 m (25BTX073); 1.52 g/t Au over 15.76 m (25BTX082); 1.46 g/t Au over 15.71 m (25BTX082) including; 6.86 g/t Au over 0.64 m; and 8.77 g/t Au over 0.49 m; and 1.96 g/t Au over 8.25 m (25BTX074) including; 18.15 g/t Au over 0.65 m. The 2025 drill program at Qiqavik was the first completed by Alamos since acquiring the asset in 2024. Drilling in all five target areas intersected gold mineralization, with 72% of the holes reporting gold grades above 1.0 grams per tonne of gold (?g/t Au?). Additionally, the program successfully intersected gold mineralization associated with several previously identified high-grade gold boulder trends, confirming proximal bedrock sources and short glacial transport distances.

The success of this early-stage greenfield drilling program across multiple target areas continues to support the significant gold endowment potential of the Qiqavik Project. Lynn Lake 2025 Exploration Program; A total of $3.4 million was spent on exploration at Lynn Lake in 2025 with the focus on Mineral Resource expansion drilling at both Linkwood and BT. A total of 7,268 metres (?m?) of drilling was completed in 41 holes.

As reported on February 18, 2025, total Mineral Reserves for the Lynn Lake District increased 42% to 3.3 million ounces grading 1.29 g/t Au (80.1 mt). The increase was driven by the successful conversion of Mineral Resources to Reserves at Linkwood and BT in 2024 resulting in an initial Mineral Reserve of 0.9 million ounces grading 0.95 g/t Au (31 mt). Linkwood and BT are satellite deposits to the Lynn Lake project and are expected to provide additional mill feed.

The deposits are accessible by an all-season gravel road from Highway 397, approximately 28 km from the planned MacLellan mill. An internal economic study on Burnt Timber and Linkwood was released on February 13, 2025, outlining an attractive, low capital, high-return project. Linkwood and BT are expected to extend the mine life of the Lynn Lake project to 27 years (from 17), increase longer term rates of production, and enhance the overall economics.

There is significant potential to continue expanding mineralization beyond the currently defined Mineral Reserve pits at both Linkwood and BT. Additionally, the East Foster target is located in proximity to the Linkwood deposit one kilometre (?km?) to the southwest representing an additional potential satellite deposit with mineralization open at depth and along strike. East Foster occurs along an east-west trending splay of the Johnson shear zone with mineralization occurring within silicified felsic dykes intruding carbonate and biotite altered mafic volcanic rock.

The 2025 drill program at Linkwood was successful in extending mineralization to the west, and below the Mineral Reserve pit. The deposit remains open at depth and to the west, with the extent of the Mineral Reserve pit at depth having been defined by the limit of historical drilling. At BT, drilling was successful in extending mineralization to both the west of, and below the eastern extent of the Mineral Reserve pit.

This is expected to contribute to another year of growth in Mineral Reserves and Mineral Resources at both deposits which represents further upside to the Lynn Lake project.