Blue River Resources Ltd. — Regulatory Filings 2021

Apr 1, 2021

SLR International Corporation 1658 Cole Blvd, Suite 100, Lakewood, CO 80401

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March 31, 2021

CONSENT OF QUALIFIED PERSON

I, Andrew P. Hampton, M.Sc., P.Eng., do hereby consent to the public filing of the report titled “Technical Report on El Limón Complex, León and Chinandego Departments, Nicaragua” (the Technical Report), prepared for Calibre Mining Corp. (Calibre) and dated March 30, 2021, and to the use of extracts from, or the summary of, the Technical Report in the news release of Calibre dated March 29, 2021 (the News Release) and Annual Information Form (AIF) dated March 31, 2021.

I also certify that I have read the News Release and AIF and that they fairly and accurately represent the information in the Technical Report that supports them.

(Signed) Andrew P. Hampton

Andrew P. Hampton, M.Sc., P.Eng.

www.slrconsulting.com