Alamos Gold Inc. ((TSX:AGI, NYSE:AGI), (TSX:AGI, NYSE:AGI)) ("Alamos" or the "Company") today provided operational updates at its Young-Davidson and Island Gold District operations, as well as revised its second quarter production and cost guidance.

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

Young-Davidson operational update

Production from Young-Davidson in the second quarter has been impacted by recent events. Last week, the operation experienced two seismic events, with one occurring at an active mining front. No injuries were sustained; however, infrastructure was damaged limiting access to two higher grade stopes that were scheduled to be mined during the second quarter. The mining sequence is consistently reviewed and monitored to manage seismicity, and based on these recent events, the Company expects mining rates to average approximately 5,000 tonnes per day ("tpd") for the remainder of the year. The Company will be optimizing the mining sequence and implementing additional ground support measures through the second half of the year, which is expected to support higher mining rates beyond 2026. A further update on the near-term outlook for Young-Davidson will be provided with the release of second quarter financial results in late July.

Additionally, the operation experienced power outages due to storm related damage to the regional power line in late May. The remote location of the power line along the route between the town of Kirkland Lake and Young-Davidson contributed to longer response time from the utility company. This resulted in a total of three days of unplanned downtime which impacted mining rates and production for the quarter.

Impact on second quarter and full year guidance

Given the seismic events at Young-Davidson, the unplanned downtime for power loss in May, and lower grades mined, the Company expects Young-Davidson production to be lower than anticipated for the second quarter and in-line with the first quarter. The Company is revising its second quarter production guidance to between 130,000 and 135,000 ounces, reflecting the shortfall at Young-Davidson, as well as the timing of recovery of ounces at La Yaqui Grande. Island Gold production for the second quarter is expected to be in line with plan for the quarter. Updated quarterly production guidance represents a 12% decrease from previous guidance based on the mid-point. Second quarter costs are also expected to be higher than previously guided, reflecting the lower production at Young-Davidson.

Given lower first half production and lower mining rates expected from Young-Davidson through the second half of the year, the Company expects consolidated production will be below the low end of 2026 guidance, and costs above full year guidance. The Company will provide revised 2026 consolidated production and cost guidance with the release of its second quarter financial results in late July.