Newly Discovered Miroir Target With Drill Hole DUP25-064

VANCOUVER – First Mining Gold Corp. reported on the 2025 drilling program at its Duparquet Gold Project located in the Abitibi region of Quebec, Canada. The Company is actively drilling at the Duparquet Project through to the fall and has completed ~16,000 m of drilling to date, with a continued focus on advancing potential resource growth targets. Since the initial discovery (see January 2025 news release), a total of 20 holes have been drilled at Miroir, with assay results from some of these holes already disclosed. Assay results from the remaining 13 holes drilled at Miroir as part of the 2025 program are pending. The Company will provide further updates as results are received and interpreted.
Drilling at the Miroir target, located 225 m north of the Central Duparquet – Valentre – Dumico (CVD) target, continues to build strong continuity, returning multiple robust gold intercepts near surface. Assay results from drill hole DUP25-064 returned 3.23 g/t Au over 25.9 m, including 11.20 g/t Au over 2.0 m, and including 10.16 g/t Au over 1.4 m. Drill hole DUP25-066, which is a 45 metre step-out to the east of DUP25-064, returned 1.37 g/t Au over 30.6 m, including 2.56 g/t Au over 4.0 m, and including 2.55 g/t Au over 6.6 m. These latest drilling results further support the continuity of near-surface higher-grade mineralization and extends the Miroir target to a vertical depth of 100 m below surface, where it remains open both up-dip toward surface and at depth.
“The Miroir target continues to deliver new discoveries within the largely underexplored volcanic setting of the Duparquet Project,” stated Dan Wilton, CEO. “The strong grades and widths encountered to date provide new and exciting opportunities in our review of development scenarios that can now include near-surface, higher grade mineralization potential.”