Sendero Resources Corp. — Audit Report / Information 2019

Feb 8, 2026

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28.1 Statement of Certification by Author

• I, Dr. Douglas F. Hambley, P.E., P.Eng., P.G., do hereby certify that:
• 1. I am a consulting mining engineer and geologist and Senior Associate at its office located at 1536 Cole Boulevard, Suite 220 in Lakewood, Colorado, USA and primary author of the report "NI 43-101 Technical Report Summarizing Detailed Engineering Design, Milestone Phase-I Pilot Project, (Subsurface Mineral Lease KLSA 008), Saskatchewan" dated 7 January 2020 and effective as of 24 September 2019 (the "Technical Report"). I am solely responsible for Sections 2 through 13, 19, 20, and 23, and jointly responsible for Sections 1, 14 through 16, 21, 22, 24, 25, and 26 of this Technical Report and I have reviewed and jointly edited all sections of this Technical Report.
• 1. I am a member in good standing of Professional Engineers Ontario, being registered as a Professional Engineer (No. 18026013) since July 1975 and of the Association of Professional Engineers and Geoscientists of Saskatchewan, being registered as a Professional Engineer (No. 16124) since January 2009.
• 1. I am also licensed as a Professional Engineer in the states of Colorado, Illinois, Michigan, Nebraska, Ohio, Pennsylvania, and Wisconsin and as a Professional Geologist in Illinois and Indiana. I served on the Board of Licensing for Professional Geologists of Illinois during its initial 4 years (1996 to 2000).
• 1. I have practiced my profession as a mining engineer and geologist since May 1972. I have been practicing as a consulting engineer and geologist since May 1980.
• 1. I am a graduate of the Faculty of Applied Science at Queen's University at Kingston, Ontario, and earned a Bachelor of Science with Honours degree in Mining Engineering in May 1972. I earned a Doctor of Philosophy (PhD) in Earth Sciences from the University of Waterloo in May 1991. My PhD thesis concerned the prediction of creep around mined openings in salt and potash.
• 1. I am a Life Member of the Canadian Institute of Mining, Metallurgy, and Petroleum (CIM), a Registered Member of the Society for Mining, Metallurgy, and Exploration (SME), a Member of the Society of Petroleum Engineers (SPE) and Society of Economic Geologists (SEG), and an Associate Member of the International Institute of Minerals Appraisers (IIMA). I am a member of the Resources and Reserves (R and R) and Registered Member Admissions Committees of SME.
• 1. As a consulting mining engineer and geologist, I have been involved from 1984 to 1991 and from 2007 to present with evaluation of resources and reserves and design of mines and other underground facilities in salt and potash in Louisiana, Texas, New Mexico, New Brunswick, Michigan, Ontario, Saskatchewan, Manitoba, Colorado, Arizona, Brazil, Russia, the Republic of Congo, and Ethiopia. I have been involved in construction management and project cost estimation since 1977.

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• 1. As a result of my experience and qualifications, I am a Qualified Person as defined in National Instrument 43-101.
• 1. I have no involvement with Subsurface Mineral Lease KLSA 008 or Western Potash Corp. beyond my involvement with Prefeasibility, Feasibility, and Pilot Studies and preparation and writing of the Technical Reports. I am independent of the issuer according to the definition of independence presented in Section 1.5 of National Instrument 43-101.
• 1. I visited the site on 14 December 2009 and 31 January 2011, and inspected the drill core from the WPC wells at the Saskatchewan Energy and Resources core warehouse in Regina on 15 and 16 December 2009 and at North Rim Exploration's Field Office in Saskatoon on 1 February 2011. I have not visited the site since construction began this year.
• 1. As of the effective date of the Technical Report, to the best of my knowledge, information, and belief, those sections or parts of the Technical Report for which I was responsible contain all scientific and technical information that is required to be disclosed to make those sections or parts of the Technical Report not misleading.
• 1. I have read National Instrument 43-101 and Form 43-101 F1. This report has been prepared in compliance with these documents to the best of my understanding.
• 1. I consent to the filing of the Technical Report with any stock exchange and other regulatory authority and any publication by them for regulatory purposes, including electronic publication in the public company files on their web sites accessible by the public, of the Technical Report.

Dated this 7 th day of January, 2020.

"SIGNED AND SEALED"
	PROFESSIONAL SEAL
Dr. Douglas F. Hambley, P.E.	(Colorado), P.Eng (Saskatchewan), P.G. (Illinois)