Sigma Lithium — Regulatory Filings 2021

Jul 16, 2021

CERTIFICATE OF AUTHOR JACQUES PARENT

I, Jacques Parent, P. Eng., do hereby certify:

1. I am a Senior Advisor with Primero Group Americas Inc., a division of Primero Group Ltd. with an office at 1450 - 1801 McGill College, Montréal, Québec.

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 graduated with a Bachelor of Mechanical Engineering from the McGill University, Montreal in 1983.

4. I am a registered Professional Engineer (#37626) with the Ordre des Ingenieurs du Quebec.

5. I have worked in many different facets of engineering design and management since my graduation in 1983.

6. I have read the definition of “qualified person” set out in the National Instrument 43-101 and certify that by reason of my education, affiliation with a professional association and past relevant work experience, I fulfil the requirements to be an independent qualified person for the purposes of NI 43-101.

7. I have no previous involvement with the project.

8. I have participated in the preparation of this Report and am responsible for Section 21.4 and 22.

9. 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 Quebec City, Quebec.

“Signed and sealed” Jacques Parent, P.Eng

Jacques Parent, P.Eng., Process Engineer Primero Group Americas Inc