Announcement • Jun 22

Alamos Gold Reports New Results from Underground and Surface Exploration Drilling At the Island Gold Mine

Alamos Gold Inc. reported new results from underground and surface exploration drilling at the Island Gold Mine. Exploration drilling has defined high-grade mineralization across multiple areas which are being targeted as sources of additional higher-grade mill feed within the expanded Magino mill. This includes defining a new zone of high-grade mineralization 250 metres west of underground Mineral Reserves and Mineral Resources (Island Gold West Extension), and continuing to extend mineralization within the Island West up-plunge area. The regional exploration program continues to intersect high-grade gold mineralization at the past-producing Cline-Pick, and Edwards mines, located seven kilometres from the Magino Mill. Island Gold West Extension Zone: high-grade mineralization has been intersected within a newly defined zone measuring approximately 200 by 300 metres based on drilling to date. This new zone is located approximately 250 metres to as much as 500 metres along strike to the west of the existing Mineral Reserves and Resources of the Island Gold Deposit, and south of the Magino deposit. The zone remains open down-plunge and to the west, with drilling continuing to target extensions of the mineralization. New highlights include: Island West Extension Zone: 12.05 g/t Au over 5.20 metres (MX26-031) including 36.67 g/t Au over 1.50 metres; 8.07 g/t Au over 5.60 metres (MX26-035W) including 45.90 g/t Au over 0.60 metres and 30.20 g/t Au over 0.45 metres. Island West up-plunge: drilling continues to expand high-grade gold mineralization across multiple zones (C, D1, DN2, G1, G10). Given its proximity to surface, and the ability to be mined via the ramp system, the Island West up-plunge area represents significant opportunity to increase combined underground mining rates beyond the 3,000 tonnes per day that is expected to be mined and skipped to surface via the shaft. This would support further production growth by increasing the proportion of higher-grade ore to be processed within the expanded Magino mill. New highlights include: 14.51 g/t Au (4.60 g/t cut) over 5.21 metres (850-482-05); 4.55 g/t Au (3.95 g/t cut) over 16.05 metres (850-472-41); 12.56 g/t Au (7.76 g/t cut) over 4.73 metres (850-482-08); 27.11 g/t Au (8.15 g/t cut) over 1.65 metres (790-446-05); 18.66 g/t Au over 2.30 metres (MX26-036); 8.53 g/t Au over 4.32 metres (790-460-31); and 3.30 g/t Au over 9.71 metres (790-460-32). Island West up-plunge unknown zones: high-grade mineralization intersected across multiple yet to be defined zones in both the hanging wall and footwall. Additional drilling will be focused on defining these new zones through further assessing the geometry and continuity of these zones. New highlights include: 20.94 g/t Au over 5.30 metres (850-482-07); 30.47 g/t Au over 2.65 metres (790-460-41); 16.28 g/t Au over 4.60 metres (850-482-08); 6.66 g/t Au over 7.70 metres (850-472-61); 17.24 g/t Au over 2.30 metres (850-472-76); and 7.64 g/t Au over 5.15 metres (850-482-07). Island Gold NS1 and NS4 Zone: high-grade gold mineralization intersected within new and recently defined hanging wall zones, NS1 and NS4. These zones are low-cost to develop, given their proximity to existing infrastructure. The NS1 Zone extends into the Island West up-plunge target area representing an additional opportunity to access high-grade ore from the existing ramp system. As exploration on the NS4 zone advances up-plunge, there is also the potential for this zone to extend into the Island West up plunge area. New highlights include: NS1 Zone: 19.48 g/t Au (7.17 g/t cut) over 11.63 metres (850-472-61); and 7.70 g/t Au over 5.02 metres (1025-492-29). NS4 Zone: growing parallel structure 180 metres west of NS1 Zone: 132.90 g/t Au (11.51 g/t cut) over 2.21 metres (850-472-76); 23.56 g/t Au (12.27 g/t cut) over 3.26 metres (850-470-30); 19.43 g/t Au (5.13 g/t cut) over 2.97 metres (850-470-26); 10.18 g/t Au over 3.50 metres (850-470-21); and 12.71 g/t Au over 2.64 metres (850-470-31). Cline-Pick Mine regional drilling: continues to extend high-grade gold mineralization beyond the extent of previous mining and following up on the best hole drilled to date announced earlier this year which intersected 178.07 g/t Au over 3.54 metres (25IGX128). The targets remain open in multiple directions, including at depth, with the deepest holes drilled to date down to a vertical depth of only 540 metres. The Cline-Pick, and adjacent past producing Edwards Mine are located within 7 kilometres of the Magino mill and are being targeted as potential sources of additional higher-grade mill feed within the expanded mill. New highlights include: Cline-Pick Mines: 67.93 g/t Au over 3.05 metres (26IGX143) including 127.72 g/t Au over 1.35 metres; 5.63 g/t Au over 10.77 metres (26IGX136) including 24.70 g/t Au over 2.12 metres; 62.20 g/t Au over 0.98 metres (25IGX128EXT) including 114.00 g/t Au over 0.38 metres; 9.18 g/t Au over 3.55 metres including 72.30 g/t Au over 0.43 metres; 4.70 g/t Au over 11.85 metres (26IGX137) including 9.28 g/t Au over 5.65 metres; 8.28 g/t Au over 5.05 metres including 15.71 g/t Au over 2.60 metres and 36.80 g/t Au over 0.79 metres; 2.93 g/t Au over 14.41 metres (26IGX138) including 13.48 g/t Au over 2.07 metres; and 11.89 g/t Au over 2.45 metres (26IGX140) including 50.20 g/t Au over 0.52 metres. Edwards Mine: 5.06 g/t Au over 13.60 metres (25IGX133) including 35.40 g/t Au over 0.80 metres; and 5.96 g/t Au over 2.25 metres including 10.30 g/t Au over 1.10 metres. 88-60 Zone: 24.12 g/t Au over 3.88 metres (26IGX136) including 63.50 g/t Au over 1.42 metres.

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