Batchewana First Nation and Alamos Gold Advance Mine Connector Transmission Project

Wawa, Ontario – December 16, 2025 — Batchewana First Nation (“BFN”) and Alamos Gold Inc. (“Alamos”) are advancing the next phase of the Mine Connector Transmission Project, a key initiative that will deliver clean, reliable energy to the Algoma District and support the continued growth of Alamos’ Island Gold District.

An expropriation application has been filed with the Ontario Energy Board (OEB) related to the Mine Connector Transmission Project. This represents an important milestone in ensuring the project moves forward in a manner that supports Ontario’s clean energy objectives and delivers lasting benefits for the region.

“Batchewana First Nation’s energy strategy is rooted in sustainability, economic growth, and reconciliation,” said Chief Mark McCoy, Batchewana First Nation. “By investing in transmission and renewable energy projects, we are supporting Ontario’s clean energy transition, reducing greenhouse gas emissions, and strengthening our local economy. These projects reflect the principles of Truth and Reconciliation by advancing Indigenous-led development, creating equitable opportunities, and ensuring respectful stewardship of our lands for future generations.”

The Mine Connector Transmission Project builds on the partnership announced earlier this year between BFN and Alamos for the construction of a new 115-kilovolt transmission line to the Island Gold District. The line, expected to be in service by 2026, will be owned and operated by Batchewana First Nation, marking a major step toward Indigenous energy leadership and long-term economic self-determination.

“This line is more than infrastructure. It’s a partnership with Batchewana First Nation that supports Indigenous-led economic development, as well as a shared commitment to clean energy and sustainable development,” said John A. McCluskey, President and Chief Executive Officer of Alamos Gold. “Once complete, the line will connect our mining operation to Ontario’s clean electricity grid and help us reduce our GHG emission intensity to 70% below the industry average.”

The Mine Connector Transmission Project delivers broad public interest benefits for both the local community and Ontario’s energy system. It builds technical and organizational capacity within Batchewana First Nation to manage large-scale infrastructure, while creating new opportunities for community-owned enterprises and local partnerships.

These outcomes foster inclusive economic development, entrepreneurship, and the growth of long-term, sustainable employment across the Algoma region.

Equally important, the project represents a strategic milestone in environmental stewardship. As the first transmission project developed and owned by Batchewana First Nation, it strengthens the Nation’s leadership role in the clean energy transition. By enabling the delivery of renewable electricity to mining operations, the project reduces reliance on fossil fuels, lowers greenhouse gas emissions, and aligns with BFN’s deep cultural commitment to caring for the land.

This initiative is also a catalyst for regional growth. By supporting the responsible expansion of the Island Gold District and attracting third-party investment, the project helps diversify the local economy and ensures that the benefits of development are shared broadly and sustainably throughout the Algoma District.

Batchewana First Nation is a progressive Indigenous community located in the Algoma region of Northern Ontario. Guided by the principles of sustainability, self-determination, and respect for the land, BFN continues to advance clean energy and infrastructure initiatives that strengthen community prosperity and environmental stewardship.

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+ 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.

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Certain of the statements made and information contained herein, other than statements of historical fact and historical information, is “forward-looking information” within the meaning of applicable Canadian and U.S. securities laws. Forward-looking statements are generally, but not always, identified by the use of forward-looking terminology such as “will”, “may”, “potential” or variations of such words that certain actions, events or results “could” “might” or “will” occur or be achieved. Forward-looking statements in this press release include information and expectations the expropriation application, the continued growth of Alamos’ Island Gold District, benefits of the Mine Connector Transmission Project to the region, reduction of greenhouse gases and expected in-service timing of the powerline. Alamos cautions that forward-looking statements are necessarily based upon several factors and assumptions that, while considered reasonable by the Company at the time of making such statements, are inherently subject to significant business, economic, legal, political and competitive uncertainties and contingencies. Known and unknown factors could cause actual results to differ materially from those projected in the forward-looking statements, and undue reliance should not be placed on such statements and information. Such factors include (without limitation): the timing and outcome of the expropriation application and delays in construction of the Mine Connector Project. Additional risk factors that may affect Alamos’ ability to achieve the expectations set forth in the forward looking statements contained in this release that pertain to Alamos are set out in its latest 40F/Annual Information Form and Management’s Discussion and Analysis, each under the heading “Risk Factors” available on the SEDAR+ website at www.sedarplus.ca or on EDGAR at www.sec.gov, and should be reviewed in conjunction with the information, risk factors and assumptions found in this press release. Alamos Gold Inc. disclaims any intention or obligation to update or revise any forward-looking statements whether as a result of new information, future events or otherwise, except as required by applicable law.