First Mining Gold Corp. — Regulatory Filings 2022

Oct 6, 2022

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CERTIFICATE OF AUTHOR – MARINA IUND

I, Marina Iund, P.Geo., M.Sc. (OGQ No. 1525, NAPEG No. L4431, PGO No. 3123), do hereby certify that:

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• I am employed as Senior Resources Geologist by InnovExplo Inc., located at 725, Boul. Lebourgneuf, Suite 312, Quebec City, Quebec, Canada, G2J 0C4.

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• This certificate applies to the report entitled “NI 43-101 Technical Report and Mineral Resource Estimate Update for the Duparquet Project, Quebec, Canada” (the “Technical Report”) with an effective date of September 12, 2022, and signature date of October 06, 2022. The Technical Report was prepared for First Mining Gold Corp. (the “issuer”).

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• I graduated with a Bachelor's degree in Geology from Université de Besançon (Besançon, France) in 2008. In addition, I obtained a Master’s degree in Resources and Geodynamic from Université d’Orléans (Orléans, France), as well as a DESS degree in Exploration and Management of Nonrenewable Resources from Université du Quebec à Montreal (Montreal, Quebec) in 2010.

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• I am a member of the Ordre des Géologues du Québec (OGQ No. 1525), the Association of Professional Geoscientists of Ontario (PGO, No. 3123), and the Northwest Territories and Nunavut Association of Professional Engineers and Professional Geoscientists (NAPEG licence No. L4431).

• I have practiced my profession in mineral exploration, mine geology and resource geology for a total of 12 years since graduating from university. I acquired my expertise with Richmont Mines Inc. and Goldcorp. I have been a project geologist and then a senior geologist in mineral resources estimation for InnovExplo Inc. since September 2018.

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• I have read the definition of a qualified person (“QP”) set out in Regulation 43-101/National Instrument 43-101 (“NI 43-101”) and certify that by reason of my education, affiliation with a professional association (as defined in NI 43-101) and past relevant work experience, I fulfill the requirements to be a QP for the purposes of NI 43-101.

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• I visited the Project on October 20, 2021, for the purpose of the Technical Report.

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• I am responsible for the overall supervision of the Technical Report. I am the principal author of and am responsible for items 2 to 12, 23 and 27. I am the co-author of and share responsibility for items 1, 14 and 25 to 26.

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• I am independent of the issuer applying all the tests in section 1.5 of NI 43-101.

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• I have not had prior involvement with the Project that is the subject of the Technical Report.

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• I have read NI 43-101, and the items of the Technical Report for which I am responsible have been prepared in compliance with that instrument.

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• As of the effective date of the Technical Report, to the best of my knowledge, information and belief, the sections of the Technical Report for which I am responsible contain all scientific and technical information that is required to be disclosed to make the Technical Report not misleading.

Signed this 06[th] day of October 2022 in Quebec City, Quebec, Canada.

(Original signed and sealed)

Marina Iund, P.Geo. (OGQ No. 1525), M.Sc.

InnovExplo Inc.

marina.iund@innovexplo.com