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DUPARQUET PEA - SENSITIVITY ANALYSIS Gold Price Gold Price (US$/oz) $1,400 $1,600 $1,800 $2,000 $2,200 Pre-Tax NPV. 5% C$168 million C$621 million C$1.07 billion C$1.53 billion C$1.98 billion Pre-Tax IRR 8.5% 17.1% 24.9% 32.0% 38.6% After-Tax NPV 5% C$20 million C$310 million C$588 million C$859 million C$1.12 billion After-Tax IRR 5.5% 12.1% 18.0% 23.2% 28.0% Initial Capital Costs Operating Costs +20% +10% C$2.2 billion -10% -20% Pre-Tax NPV, Pre-Tax IRR After-Tax NPV 5% After-Tax IRR 5% C$814 million C$949 million C$1.07 billion C$1.18 billion C$1.28 billion 16.7% C$413million 20.4% 24.9% 30.5% 37.8% C$503 million C$588 million C$661 million C$723 million 12.0% 14.7% 18.0% 21.9% 26.9% Operating Costs Initial Capital Costs +20% +10% C$706 million -10% -20% Pre-Tax NPV 5% C$761 million C$917 million C$1.07 billion C$1.23 billion C$1.39 billion Pre-Tax IRR After-Tax NPV, 5% After-Tax IRR 19.5% $398million 14.0% 22.2% 24.9% 27.4% 29.9% $494 million C$588 million $680 million $771 million 16.0% 18.0% 19.9% 21.7% Note: Further details can be found in the technical report titled "NI 43-101 Technical Report: Preliminary Economic Assessment, Duparquet Project, Quebec, Canada", dated October 20, 2023, as filed on SEDAR+ and on www.firstmininggold.com TSX: FF | OTCQX: FFMGF | FRANKFURT: FMG | www.firstmininggold.com G FIRST MINING GOLD | 47

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