First Mining Provides Update on Springpole Gold Project

Press Release

April 23, 2026 – Vancouver, Canada – First Mining Gold Corp. (“First Mining” or the “Company”) (TSX: FF) (OTCQX: FFMGF) (FRANKFURT: FMG) announces that following discussions with the Impact Assessment Agency of Canada (“IAAC”), First Mining has voluntarily agreed to a short extension to the Environmental Assessment (“EA”) decision date on the Springpole Gold Project (the “the “Springpole Project”, or the “Project”), until June 30, 2026 (the “Extension”). The original IAAC decision date on the Springpole Project was May 22, 2026, and the Extension will provide IAAC additional time to complete the final EA report.

First Mining is pleased to announce that Cat Lake and Lac Seul First Nations have completed their independent Anishinaabe Led Impact Assessment (“ALIA”) on the Springpole Project, supported by First Mining. The communities are preparing to vote, based on the findings of the ALIA, on June 4, 2026. The short extension will allow the communities to continue working with the provincial and federal government to achieve the necessary measures to ensure they can meaningfully participate in the Project.

About Cat Lake First Nation

ᐱᔕᐤ ᓴᑲᐦᐃᑲᐣ (Bizhiw-zaaga’igan) or Cat Lake First Nation is an Anishinaabe community in northwestern Ontario, located approximately 180 kilometres north of Sioux Lookout. As of February 2024, it has 830 registered members, with 653 living in Cat Lake First Nation reserve lands. Cat Lake members traditionally speak Anishinaabemowin. Cat Lake First Nation’s reserve lands and traditional territory fall within the boundaries of Treaty 9. However, Cat Lake First Nation asserts it has never signed a treaty with the Crown.

About Lac Seul First Nation

Obishikokaang (Lac Seul) First Nation is an Anishinaabe community in northwestern Ontario consisting of five distinct communities: Canoe River, Whitefish Bay, Kejick Bay, Frenchman’s Head, and Namekosipiink (Trout Lake). As of May 2017, Lac Seul had a membership population of 3,452, with approximately 30% of members living in one of the five communities. Lac Seul members traditionally speak Anishinaabemowin. Lac Seul First Nation is a signatory to Treaty 3.

About First Mining Gold Corp.

First Mining is a gold developer advancing two of the largest gold projects in Canada, the Springpole Gold Project in northwestern Ontario, where permitting activities are on-going with a final Environmental Impact Statement / Environmental Assessment for the project submitted in November 2024, and the Duparquet Gold Project in Quebec, a PEA-stage development project located on the Destor-Porcupine Fault Zone in the prolific Abitibi region. First Mining also owns a 30% project interest in the Pickle Crow Gold Project and large equity interest in Seva Mining Corp.

First Mining was established in 2015 by Mr. Keith Neumeyer, founder and CEO of First Majestic Silver Corp.

ON BEHALF OF FIRST MINING GOLD CORP.

Daniel W. Wilton
Chief Executive Officer and Director

For further information, please contact:

Toll Free: 1 844 306 8827 | Email: info@firstmininggold.com
Paul Morris | Director, Investor Relations | Email: paul@firstmininggold.com

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