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Investor Presentaiton

DUPARQUET PEA HIGHLIGHTS LOM Annual 233 koz Au Initial Capital C$706 M Recovered Au Total Produced Au Oz 2.5 Moz Au After-Tax NPV @ 5% C$588 M LOM Cash Costs US$751/oz After-Tax IRR 18.0% LOM AISC US$976/oz After-Tax Payback 4.8 Years G FIRST MINING GOLD Notes: • • . Base case parameters assume a gold price of US$1,800/oz and an exchange rate (C$ to US$) of 1.33. All currencies are reported in U.S. dollars unless otherwise specified. NPV calculated as of the commencement of construction and excludes all pre-construction costs. Cash costs consist of mining costs, processing costs, mine-level G&A, treatment and refining charges and royalties. AISC consists of cash costs plus sustaining and closure costs. The PEA is preliminary in nature, that it includes inferred mineral resources that are considered too speculative geologically to have the economic considerations applied to them that would enable them to be categorized as mineral reserves, and there is no certainty that the PEA will be realized 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 | 24
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