GR SILVER MINING LTD. — Regulatory Filings 2023

May 4, 2023

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CERTIFICATE OF QUALIFIED PERSON

Shane Tad Crowie, P. ENG.

• I, Shane Tad Crowie, P. Eng., do hereby certify that:

  1. This certificate applies to the Technical Report entitled “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;

  2. I am currently employed as Sr. Metallurgist with JDS Energy & Mining Inc. with an office at Suite 900 – 999 West Hastings Street, Vancouver, British Columbia, V6C 2W2;

  3. I am a graduate of the University of British Columbia with a B.A.Sc. in Mining and Mineral Process Engineering, 2001. I have practiced my profession continuously since 2001. I have worked in technical, operations and management positions at mines in Canada. I have been responsible for recovery optimization projects, capital improvement projects, budgeting, planning, and pilot plant operations;

  4. I am a Registered Professional Mining Engineer in British Columbia (#34052);

  5. I have read the definition of “qualified person” set out in National Instrument 43-101 and certify that by reason of education, experience, independence and affiliation with a professional association, I fulfil the requirements of a Qualified Person as defined in National Instrument 43-101;

  6. I have not visited the Plomosas Project;

  7. I am responsible for Sections 13 and corresponding sections of 18 of this Technical Report;

  8. I am independent of the Issuer and related companies applying all of the tests in Section 1.5 of the NI 43-101;

  9. I have had no prior involvement with the property that is the subject of this Technical Report. 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;

  10. I am not aware of any material fact or material change with respect to the subject matter of the technical report that is not reflected in the Technical Report and that this technical report contains all scientific and technical information that is required to be disclosed to make the technical report not misleading; and

  11. I have read National Instrument 43-101, Standards for Disclosure of Mineral Properties and Form 43-101F1. This technical report has been prepared in compliance with that instrument and form.

Effective Date: March 15, 2023 Signed Date: May 3, 2023

(Original signed and sealed) “Shane Tad Crowie, P. Eng.”

Shane Tad Crowie, P. Eng.

JDSMINING.CA

JDS ENERGY & MINING INC. Suite 900 – 999 West Hastings Street | Vancouver, BC | V6C 2W2 T 604.558.6300