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CAMERON GOLD PROJECT Excellent infrastructure with year-round highway access; camp, powerline within 20 km; 88 km from Rainy River mine Recent acquisition of East Cedartree claims consolidates strategic part of Cameron Gold Project and increases resource opportunity Acquisition adds over 32,200 hectares of prospective mineral tenure in the middle of the Cameron land package Exploration and drilling program currently being scoped Cameron NI 43-101 Resource* 430,000 mE Dogpaw McLennan Robertson Emm Bay Angel Hill Dubenski Syncline Anticline Syncline 440,000 mE East Cedartree FIRST MINING GOLD 450,000 mE 460,000 mE 470,000 mE N Shingwak Lake Anticline Monte Cristo Shear Zone Victor Monte Cristo Roy Jupiter Juno Hermione Sullivan Ajax Meston Cameron Shear Cameron Pipestone Cameron Fault 5,450,000 mN 5,460,000 mN 0 Kilometres 10 Resource Classification Constraint Au Cut- off (g/t) Tonnage Au Grade (g/t) Ounces Ontario Measured + Indicated Measured + Indicated Within $1,350 open-pit shell Below $1,350 open-pit shell 0.55 3,490,000 2.45 274,000 Kenora Timmins Thunder Bay Intermediate Felsic Volcanics Ottawa Mafic Volcanics 2.00 2,040,000 2.90 190,000 Map Extent Toronto Geology* Legend Mafic & Ultramafic Intrusives ☐ Felsic Intrusives Historical Development Gold Occurrence ☐ Cameron Gold Project Lake G FIRST MINING GOLD Cameron Gold Project Regional Geology Kenora Mining Division, Ontario Metasediments -Shear Zone Total M & I 5,530,000 2.61 464,000 *Ontario Geological Survey 2011: 1:250 000 scale bedrock geology of Ontario Miscellaneous Release Data 126- Revision 1 Projection: NAD83 Zone 15 Inferred Within $1,350 open-pit shell Below $1,350 0.55 35,000 2.45 3,000 Inferred Total Inferred 2.00 6,500,000 2.54 530,000 open-pit shell 6,535,000 2.54 January 2023 533,000 (*) See slide 25 for further details and disclosure, and refer to the technical report titled "Technical Report on the Cameron Gold Deposit, Ontario, Canada", dated effective January 17, 2017, which was prepared for First Mining by Optiro Pty Limited in accordance with NI 43-101, and which is available under First Mining's SEDAR+ profile at www.sedar.com. TSX: FF | OTCQX: FFMGF | FRANKFURT: FMG | www.firstmininggold.com | 52

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