GR SILVER MINING LTD. — Regulatory Filings 2023

May 4, 2023

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ARSENEAU Consulting Services

Certificates of Qualified Person

I, Dr. Gilles Arseneau, P.Geo., do hereby certify that:

1. I am President of ARSENEAU Consulting Services Inc. (ACS), a corporation with a business address of Suite 900, 999 West Hastings Street, Vancouver, British Columbia, Canada.

2. I am the author of the technical report titled “National Instrument (NI) 43-101 2023 Technical Report and Mineral Resource Update for the Plomosas Project” dated May 3, 2023, with an effective date of March 15, 2023 (this “Technical Report”) prepared for GR Silver Mining Ltd.

3. I am a graduate of the University of New Brunswick with a B.Sc. (Geology) degree obtained in 1979, the University of Western Ontario with an M.Sc. (Geology) degree obtained in 1984 and the Colorado School of Mines with a Ph.D. (Geology) obtained in 1995.

4. I have practiced my profession continuously since 1995. I have worked in exploration in North and South America and have extensive experience with precious and base metal mineralization similar to that found on the Plomosas Project.

5. I am a Professional Geoscientist registered member, in good standing, with the Association of Professional Engineers & Geoscientists of British Columbia (23474).

6. I have read the definition of “qualified person” set out in National Instrument 43–101 Standards of Disclosure for Mineral Projects (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 am a “qualified person” within the meaning of NI 43-101.

• 7 My most recent personal inspection of the Project occurred from December 5 to December 7, 2022.

1. I am responsible for Sections 1 to 12 and 14 to 19 of the Technical Report and accept professional responsibility for these sections of the Technical Report.

2. I am independent of GR Silver and of the Plomosas Project as defined in Section 1.5 of NI 43 101.

3. I have had prior involvement with the Plomosas Project. I am the author of the previous technical report titled Technical Report for the Plomosas Precious and Base Metal Project, Sinaloa, Mexico, dated October 7, 2021, with an effective date of March 15, 2021, prepared for GR Silver Mining Ltd.

4. I have read NI 43-101, Form 43-101F1 and the Technical Report has been prepared in compliance with that instrument and form.

5. As of the effective date of the Technical Report, to the best of my knowledge, information and belief, the Technical Report contains all scientific and technical information that is required to be disclosed to make the Technical Report not misleading.

Dated this 3[rd] day of May 2023 in Vancouver, British Columbia.

[Original “signed and sealed”]

Dr. Gilles Arseneau, P. Geo.

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