Mr. Daniel Wilton reports

FIRST MINING ANNOUNCES SALE OF 20% INTEREST IN HOPE BROOK GOLD PROJECT

First Mining Gold Corp. has entered into an agreement with Big Ridge Gold Corp. to sell its remaining 20-per-cent project interest in the Hope Brook gold project for total consideration composed of $3-million in cash and seven million common shares of Big Ridge.

"We are very excited to come to an agreement with Big Ridge for them to consolidate 100-per-cent ownership of the Hope Brook gold project," stated Dan Wilton, chief executive officer of First Mining. "This transaction continues to demonstrate the financial flexibility that our non-core asset portfolio can provide as we look to advance our two flagship projects at Springpole and Duparquet. First Mining will retain exposure to the Hope Brook gold project as a shareholder of Big Ridge and look forward to its continued success."

The transaction is expected to close in third quarter 2025.

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 it has commenced a feasibility study and permitting activities are continuing, with a final environmental impact statement/environmental assessment for the project submitted in November, 2024, and the Duparquet gold project in Quebec, a preliminary-economic-assessment-stage development project located on the Destor-Porcupine fault zone in the prolific Abitibi region. First Mining also owns the Cameron gold project in Ontario and a portfolio of gold project interests including the Pickle Crow gold project (being advanced in partnership with Firefly Metals Ltd.) and the Hope Brook gold project (being advanced in partnership with Big Ridge).

We seek Safe Harbor.