Investor Presentaiton

FORWARD LOOKING STATEMENTS G FIRST MINING GOLD This presentation includes certain "forward-looking information" and "forward-looking statements" (collectively "forward-looking statements") within the meaning of applicable Canadian and United States securities legislation including the United States Private Securities Litigation Reform Act of 1995. These forward-looking statements are made as of the date of this presentation. Forward- looking statements are frequently, but not always, identified by words such as "expects", "anticipates”, “believes", "plans", "projects", "intends", "estimates", "envisages", "potential", "possible", "strategy", "goals", "objectives", or variations thereof or stating that certain actions, events or results "may", "could", "would", "might" or "will" be taken, occur or be achieved, or the negative of any of these terms and similar expressions. Forward-looking statements in this presentation relate to future events or future performance and reflect current estimates, predictions, expectations or beliefs regarding future events and include, but are not limited to, statements with respect to: (i) First Mining Gold Corp.'s ("First Mining" or the "Company") business strategies and objectives, including plans, opportunities, expectations and intentions; (ii) the timing and amount of planned and future exploration and expenditures and the possible results of such exploration; (iii) the estimated amount and grade of mineral resources and mineral reserves at the Company's projects; (iv) the expected benefits of the transaction with First Majestic Silver Corp. and the timing of any payments to the Company in connection with the transaction; (v) the expected benefits of the transaction with Treasury Metals Inc. ("Treasury Metals"); (vi) the future plans and objectives relating to the Goliath Gold Complex including any work plans of Treasury Metals; (vii) timing for the receipt of any milestone- based payments in the transaction with Treasury Metals; (viii) timing for the receipt of any cash and/or share payments from FireFly Metals Ltd ("FireFly") in respect of the various earn-in stages required to complete their earn-in of up to an 80% interest in the Company's Pickle Crow gold project; (ix) timing for the receipt of any cash and/or share payments from Big Ridge Gold Corp. ("Big Ridge") in respect of the various earn-in stages required to complete their earn-in of up to an 80% interest in the Company's Hope Brook gold project; (x) non-GAAP valuations regarding any future cash and/or share payments that the Company expects to receive from Treasury Metals, FireFly or Big Ridge; (xii) the Springpole PFS representing a viable development option for the Company's Springpole gold project; (xiii) construction of a mine at the Springpole project and related actions, including dewatering activities; (xiv) estimates of the capital costs of constructing mine facilities and bringing a mine into production, of sustaining capital and the duration of financing payback periods related to the Springpole project; (xv) the estimated amount of future production, both produced and metal recovered, from the Springpole project; (xvi) life of mine estimates and estimates of operating costs, all-in sustaining costs and total costs, net cash flow, net present value and economic returns from an operating mine constructed at the Springpole project; (xvii) the advancement of permitting activities and applications related to the Springpole project; (xviii) the timing for submitting an Environmental Impact Statement in respect of the Springpole project and all dates that relate to the permitting timeline for the project; (xix) the results of the Preliminary Economic Assessment ("PEA") completed for the Duparquet Gold Project ("Duparquet"), including the economic potential and merits thereof and 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; (xx) the estimated capital and operating costs, production, cash flow and life of mine estimates and economic returns from Duparquet; (xxi) the estimated amount and grade of mineral resources at Duparquet; and (xxii) current and future drilling strategies and programs at Duparquet. All forward-looking statements are based on First Mining's or its consultants' current beliefs as well as various assumptions made by them and information currently available to them. By their very nature, forward-looking statements involve inherent risks and uncertainties, both general and specific, and risks exist that estimates, forecasts, projections and other forward-looking statements will not be achieved or that assumptions do not reflect future experience. We caution readers not to place undue reliance on these forward-looking statements as a number of important factors could cause the actual outcomes to differ materially from the beliefs, plans, objectives, expectations, anticipations, estimates assumptions and intentions expressed in such forward-looking statements. These risk factors may be generally stated as the risk that the assumptions and estimates expressed above do not occur as forecast, but specifically include, without limitation: (i) the risk that the Company's business, operations and financial condition may be materially adversely affected by the outbreak of epidemics, pandemics or other health crises, such as COVID-19, and by reactions by government and private actors to such outbreaks; (ii) risks to the health and safety of the Company's employees and consultants as a result of the outbreak of epidemics, pandemics or other health crises, such as COVID-19, that may result in a slowdown or temporary suspension of operations at some or all of the Company's mineral properties as well as its head office; (iii) the risk that the Company will not be successful in completing additional acquisitions; (iv) risks relating to the results of exploration activities; (v) risks relating to the ability of the Company to enter into joint venture, earn-in, royalty or streaming structure agreements, or to dispose of its mineral properties; (vi) developments in world metals markets; (vii) risks relating to fluctuations in the spot and forward price of gold, silver, base metals or certain other commodities; (viii) risks relating to fluctuations in the Canadian dollar relative to the US dollar; (ix) the speculative nature of mineral exploration and development; (x) risks and hazards associated with the business of mineral exploration, development and mining (including environmental hazards, industrial accidents, unusual or unexpected formations, pressures, cave-ins and flooding); (xi) availability of necessary financing and any increases in financing costs or adverse changes to the terms of available financing, if any; (xii) changes in regulations applying to the development, operation, and closure of mining operations from what currently exists; (xiii) the effects of competition in the markets in which First Mining operates; (xiv) operational and infrastructure risks; (xv) risks relating to variations in the mineral content within the material identified as mineral resources from that predicted; (xvi) risks relating to the failure to distribute a significant portion of the equity consideration from the transaction with Treasury Metals to the Company's shareholders; (xvii) increases in estimated capital and operating costs or unanticipated costs with respect to any of the Company's mineral projects (xviii) difficulties attracting the necessary work force; (xix) risks relating to receipt of permits and regulatory approvals; (xx) delays in stakeholder negotiations (including negotiations with affected local and Indigenous communities of interest around our material projects); (xxi) tax rates or royalties being greater than assumed; (xxii) changes in development or mining plans due to changes in logistical, technical or other factors; (xxiii) changes in project parameters as plans continue to be refined (xxiv) management's discretion to alter the Company's short and long- term business plans; (xxv) the additional risks described in First Mining's Annual Information Form for the year ended December 31, 2022 filed with the Canadian securities regulatory authorities under the Company's SEDAR+ profile at www.sedarplus.ca, and in First Mining's Annual Report on Form 40-F filed with the SEC on EDGAR. First Mining cautions that the foregoing list of factors that may affect future results is not exhaustive. When relying on our forward- looking statements to make decisions with respect to First Mining, investors and others should carefully consider the foregoing factors and other uncertainties and potential events. First Mining does not undertake to update any forward-looking statement, whether written or oral, that may be made from time to time by the Company or on our behalf, except as required by law. Hazel Mullin, P.Geo., Director, Data Management and Technical Services of First Mining, is a "qualified person" for the purposes of National Instrument 43-101 Standards of Disclosure for Mineral Projects ("NI 43-101"), and she has reviewed and approved the scientific and technical disclosure contained in this presentation. Louis Martin P.Geo, (OGQ 0364) of First Mining, is a "qualified person" for the purposes of NI 43-101, and he has reviewed and approved the scientific and technical disclosure contained in this presentation. Note: all information presented in Canadian dollars unless otherwise noted; as at April 12, 2024. TSX: FF | OTCQX: FFMGF | FRANKFURT: FMG | www.firstmininggold.com 1