Jeremy Gillis Appointed Interim CEO of Sendero Resources Corp.

Vancouver, British Columbia — September 8, 2026 — Leads & Copy — Sendero Resources Corp. has appointed Jeremy Gillis as Interim Chief Executive Officer, the company announced Tuesday.

Gillis brings over 25 years of international business experience, including 15 years in natural resources, and has served as Sendero’s Director of Corporate Development since 2024.

Prior to joining Sendero, Gillis spent 10 years at Yamana Gold, advancing through consecutive internal promotions. He then moved into junior resource company development in 2020, serving as Founder, Chief Executive Officer, and a director of Karus Mining Inc.

“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,” Gillis said. “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 but 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,” said Director Steven McMullan, a 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.”

Sendero Resources Corp. is focused on copper-gold exploration at its 100% owned Peñas Negras Project in the Vicuña Belt in Argentina. The project has similar geological characteristics to other deposits in the Vicuña Belt, and multiple porphyry and high-sulfidation epithermal targets have been identified.

The company’s target area is located approximately 12 km north-northeast of the Josemaria resource area. The center of the Peñas Negras concession area is situated approximately 18 km southeast of the 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. Sendero also has an option to earn a 100% interest on eight additional granted mining concessions covering 91.7 km2, bringing the total project area to 211.77 km2.

Source: Sendero Resources Corp.