Sendero Resources Appoints Jeremy Gillis as Interim CEO

Vancouver, British Columbia – TheNewswire - (September 8, 2026) – Sendero Resources Corp. (TSXV: SEND) (FSE:9O40) (the “Company” or “Sendero”) is pleased to announce the appointment of Jeremy Gillis as Interim Chief Executive Officer of the Company.

Mr. Gillis has over 25 years of international business experience, including the last 15 years in natural resources. He has served as Sendero's Director of Corporate Development since 2024. Prior to joining Sendero, Mr. Gillis spent 10 years at Yamana Gold, advancing through consecutive internal promotions, before moving into junior resource company development in 2020 and serving as Founder, Chief Executive Officer, and a director of Karus Mining Inc.

Mr. Gillis commented, " Peñas Negras, in the heart of the Vicuña District, has demonstrated the potential to host multiple mineralized systems offering size and scale, with geological similarities to neighboring deposits. I am delighted to take on the role of Interim CEO and look forward to working with the Board, Alex, and the rest of the Sendero team. We are fortunate to have the strong backing of our cornerstone investors, with impressive foundations to build on, affording us a springboard into our fully funded $3.5 million upcoming drill campaign at Peñas Negras. With a district in the making, I am excited for the near-term opportunities ahead for Sendero as we prepare to test multiple high-priority targets along a nine-kilometer-long trend benefiting from mineralization at surface. "

As part of this transition, Alex Gostevskikh has stepped down as Chief Executive Officer of the Company. Mr. Gostevskikh will remain a member of Sendero’s Board of Directors and serve as a Consultant to the Company.

" The Board thanks Mr. Gostevskikh for his leadership as Chief Executive Officer and looks forward to his continued involvement with the Company ," commented Director Steven McMullan, member of the team that won the PDAC International Discovery Award at Ivanhoe's Kamoa Deposit in the DRC. " Peñas Negras possesses the hallmarks of a fertile Vicuña porphyry-epithermal system. With our fully funded drill campaign now set to test this district-scale potential, we believe we are well positioned to make a significant discovery in one of the world's most exciting copper-gold belts within the Miocene Andean magmatic arc, the same metallogenic event responsible for multiple large copper-gold systems along the Vicuña Belt, characterized by long-lived, metal-fertile intrusive activity and large hydrothermal footprints, with the right geology and alteration, as well as coincident geochemical and geophysical anomalies. ”

About Sendero Resources Corp.

The Company is focused on copper-gold exploration at its 100% owned Peñas Negras Project in the Vicuña Belt in Argentina. The Peñas Negras Project has similar geological characteristics to other deposits in the Vicuña Belt and multiple porphyry and high-sulfidation epithermal targets have been identified on the project. The Company’s target area is located approximately 12 km north-northeast of the Josemaria resource area, while the centre of the Peñas Negras concession area is situated approximately 18 km southeast of Caserones mine operated by Lundin Mining, approximately 24 km northeast of NGEx Minerals’ Lunahuasi project, and about 32 km north-northeast of BHP-Lundin Mining’s Filo del Sol development stage project. The Company also has an option to earn a 100% interest on eight additional granted mining concessions covering 91.7 km 2 . The total project area comprises 211.77 km 2 .

Further Information

For further information, please contact:

Sendero Resources Corp,

Jeremy Gillis, Interim Chief Executive Officer

Email: info@senderoresources.com

+1 (236) 232-0988

Follow Sendero Resources (@SenderoRes ) on X, ( ) on LinkedIn, and (@sendero_resources ) on Instagram.

Cautionary Statement on Forward-Looking Information

This press release contains “forward-looking information” and “forward-looking statements” (collectively, “ forward-looking statements ”) within the meaning of applicable Canadian securities legislation. All statements, other than statements of historical fact, are forward-looking statements and are based on expectations, estimates and projections as at the date of this press release. Any statement that involves discussions with respect to predictions, expectations, beliefs, plans, projections, objectives, assumptions, future events or performance (often but not always using phrases such as “expects”, or “does not expect”, “is expected” “anticipates” or “does not anticipate”, “plans”, “budget”, “scheduled”, “forecasts”, “estimates”, “believes” or intends” or variations of such words and phrases or stating that certain actions, events or results “may” or “could, “would”, “might” or “will” be taken to occur or be achieved) are not statements of historical fact and may be forward-looking statements. Forward-looking statements are necessarily based upon a number of estimates and assumptions that, while considered reasonable, are subject to known and unknown risks, uncertainties, and other factors which may cause the actual results and future events to differ materially from those expressed or implied by such forward-looking statements. There can be no assurance that such statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Readers should not place undue reliance on the forward-looking statements and information contained in this press release. Except as required by law, the Company does not assume any obligation to update the forward-looking statements of beliefs, opinions, projections, or other factors, should they change, except as required by law.

Cautionary Statement

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TheNewsWire

September 8, 2026 - 4:30 AM PDT

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