First Mining Gold Corp. — Regulatory Filings 2021

Jul 16, 2021

CERTIFICATE OF AUTHOR JARRETT QUINN

I, Jarrett Quinn, P. Eng., do hereby certify:

1. I am a Consulting Process Engineer for Primero Group Americas Inc. with a business address at 1450 - 1801 McGill College, Montréal, Québec, H3A 2N4.

2. This certificate applies to the Technical Report entitled “Grota do Cirilo Lithium Project: Araçuaí and Itinga Regions, Minas Gerais, Brazil, Phase 2 (Barreiro) Update of the NI 43-101 Technical Report Feasibility Study” with an effective date of June 2, 2021.

3. I am a graduate of McGill University (B.Eng. 2004, M.Eng. 2006, and Ph.D. 2014) in Metallurgical Engineering. I am a member in good standing of the Ordre des Ingénieurs du Québec (#5018119). I have worked as a metallurgist since 2006.

4. I have read the definition of Qualified Person set out in the National Instrument 43-101 (Instrument) and certify that by reason of my education, affiliation with a professional association and past relevant work experiences, I fulfil the requirement to be an independent qualified person for the purposes of NI 43-101.

5. I have participated in the preparation of this Technical Report and am responsible for Section 13 (Mineral Processing and Metallurgical Testing) and content in Chapter 17 (Recovery Methods) related to Barreiro processing.

6. I am independent of Sigma Lithium Resources Corporation as defined by Section 1.5 of the Instrument. I do not have prior involvement with the properties that are the subject of the technical report.

7. 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 and dated this July 15, 2021, at Montreal, Quebec.

Jarrett Quinn (Signed and Sealed) Jarrett Quinn, P.Eng., Ph.D. Primero Group Americas Inc