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Investor Presentaiton

DUPARQUET RESOURCE PROFILE G FIRST MINING GOLD S Duparquet open pit resource shows a potential higher grade opportunity with an Indicated resource of 1.5 Moz at 2.1 g/t Au, at a cut-off of 0.7 g/t (see Table 2) Mineralized zones are open along strike and at depth, with majority of historical drilling less than 500 m from surface; high-grade mineralized Abitibi structures prominent at 1,000 m depth Duparquet Mineral Resource Estimate - September 2022 Potential higher-grade open pit with attractive grade flexibility Area (Mining Cut-off Drilling Depth at Duparquet Majority of drill testing less than 500 m from surface and open at depth Measured Resource Indicated Resource Inferred Resource Au Method) (g/t) Tonnage (t) Ounces Tonnage (t) Open Pit 0.40 163,700 (g/t) 1.37 7,200 UG Mining 1.50 Tailings Total 0.40 19,900 183,600 2.03 1.43 1,300 8,500 59,410,600 5,506,900 4,105,200 69,022,700 Au (g/t) 1.52 Ounces Tonnage (t) 2.26 0.93 2,909,600 399,300 123,200 Au (g/t) 28,333,000 1.07 9,038,900 PLAN VIEW DUPARQUET Ounces 2.29 970,400 665,600 1.55 3,432,100 37,371,900 1.36 1,636,000 AU_FINAL_DDH X 0.6 0.200006666 0.100008333 0.00001 Table 1: 2022 Mineral Resource Estimate for the Duparquet Project, by Mining Method Measured Resource Indicated Resource Inferred Resource Area (Mining Method) Cut-off (g/t) Au Tonnage (t) Ounces Tonnage (t) (g/t) 0.7 137,321 1.53 6,755 0.65 141,757 1.5 6,836 0.6 149,158 1.46 0.55 154,634 1.42 Open Pit 0.5 156,938 0.45 161,081 1.41 1.39 0.4 0.35 163,709 165,800 1.37 1.36 23,142,210 25,666,698 7,001 32,690,577 7,060 36,556,977 7,122 41,152,335 7,187 53,548,726 7,222 59,410,612 1.52 7,248 66,307,600 Au (g/t) 2.05 Ounces Tonnage (t) Au (g/t) Ounces SECTION VIEW DUPARQUET 1,525,279 2,592,695 1.62 135,038 1.98 1,633,902 3,334,098 1.48 158,647 1.86 1.77 1.70 1,954,908 5,716,620 1.34 246,283 2,080,340 7,727,020 1.23 305,568 1.58 1.46 2,253,068 11,007,061 2,722,586 22,032,449 2,909,551 28,332,980 3,117,172 37,354,222 0.96 1.13 400,881 1.16 824,601 1.07 970,424 1,147,282 Table 2: 2022 Cut-Off Grade Sensitivity for the Duparquet Project 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, and which is available at First Mining's website or under First Mining's SEDAR+ profile TSX: FF | OTCQX: FFMGF | FRANKFURT: FMG | www.firstmininggold.com 631000 652000 X 500 688000 B00 Z-Scale 1500 Plunge 90 Azmuth G AU_FINAL_DDH X 0.61 630000 0.200006666 0.100008333 0.00001 Z-Scale 1 1000 1500 Plunge 1 Azimuth 0 | 27
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