Mr. Alex Gostevskikh reports

SENDERO RESOURCES REPORTS DRILLING RESULTS AT PEÑAS NEGRAS PROJECT; CONFIRMS GEOLOGICAL MODEL AND IDENTIFIES GEOCHEMICAL VECTORS IN VICUÑA BELT, ARGENTINA

Sendero Resources Corp. has released drilling results from the 2026 reconnaissance diamond drilling and rock sampling program at its 100-per-cent-owned Penas Negras project, La Rioja, Argentina. The company's porphyry-epithermal geological model was confirmed by the three drill holes totalling 396.3 metres on the southwestern margin of the target area and 453 rock samples collected across the property to generate new prospective areas and guide future drilling programs.

Highlights

• Near surface gold and silver mineralization return by all three drill holes;
• Gold and silver mineralization confirmed by three reconnaissance holes, with PNDH-201 returning 1.04 grams per tonne Au (gold) over 1.5 metres from 14.0 m within a broader halo of elevated gold grades extending from surface to 46.0 m (returning a weighted average of 0.11 part per million Au);
• Strong silver anomalies in all three drill holes, including 48 grams per tonne Ag (silver) over 1.5 m from 14.0 m and 28.2 g/t Ag over 1.0 m from 57.0 m in PNDH-201;
• Multiple pathfinder elements -- Sb (antimony), As (arsenic), Cu (copper), Mo (molybdenum), Pb (lead) and Zn (zinc) -- reinforce the presence of a significant hydrothermal system and will play in important role in realigning the following exploration campaign at Penas Negras;
• An extensive leached cap, considered an integral part of a significant high-sulphidation epithermal system, identified in all three diamond drill holes; the full lateral and vertical extent of this system is yet to be determined and represents a significant exploration target in its own right;
• Exceptional surface geochemistry across the property, with rock samples returning up to 4.82 g/t Au and 18.00 g/t Ag in the PN-NNW geochemical target area -- approximately nine km NNW (north-northwest) of the drilling area, highlight the potential scale of the underlying mineralized hydrothermal system and further support the company's geological model;
• The company is fully financed to continue diamond drilling at Penas Negras and plans to target the hydrothermal system in the target area along the Mogotes Fault framework.

"These results provide strong validation of our geological model for Penas Negras. This important step forward in defining the district scale potential of our strategic land package. We are especially pleased that the intermediate intrusive and volcanic host rocks, alteration, pathfinder geochemistry, stockwork veining, and Mogotes fault structural framework are all consistent with the characteristics of the world-class high-sulphidation epithermal and porphyry systems that host the Vicuna project deposits, located less than 15 kilometres to the south-southeast," said Alex Gostevskikh, chief executive officer of Sendero Resources. "The three holes completed to date, together with historical Anglo American drilling, confirm the presence of a substantial high-sulphidation epithermal system, although its full dimensions remain to be defined. Importantly, the leached cap and emerging geochemical vectors support our thesis that a deeper porphyry copper-gold system may lie beneath the priority target area, with an extensive auriferous zone of advanced argillic alteration located immediately to the north-northeast. We are very encouraged by the results of our rock sampling program, which suggest that the target area may extend significantly farther to the north and northwest."

Rock sampling program

The company completed the 2026 rock sampling program comprising 453 samples across the property, which returned up to 4.82 g/t Au and 18 g/t Ag at the PN-NNE geochemical prospect area, approximately nine kilometres to the north-northeast of the area where drilling took place. In addition, exceptionally anomalous gold samples -- up to 1.65 g/t Au, came from the PN-NW area, approximately 6.5 km to the north-northwest. In the southwest, where the drilling was being done, the rock sampling returned up to 5.13 g/t Ag. The geochemical signature and alteration patterns indicate the presence of a potential district-scale epithermal/porphyry system beneath the leached cap and colluvial overburden.

2026 reconnaissance drilling program

The reconnaissance drilling program targeted the southwestern extents of the inferred Mogotes structural corridor. The company completed drilling of three diamond drill holes totalling 396 metres, from which hole PNDH-201 returned 1.04 g/t Au over 1.5 m from 14.0 m within a broader halo of elevated gold values extending from surface to 46.0 m (returning a weighted average of 0.11 ppm Au for this interval). All three holes returned anomalous silver values including 48 g/t Ag over 1.5 m from 14.0 m and 28.2 g/t Ag over 1.0 m from 57.0 m in PNDH-201. True widths are unknown at this stage.

Hole PNDH-203 confirmed the presence of the Mogotes fault further confirming the company's geological model and mineralization being associated with the structural framework of the Vicuna belt. The hole also returned anomalous antimony values further supporting the thesis for high-sulphidation epithermal mineralization.

The geochemical patterns identified in all three holes -- and particularly the distinct antimony anomaly in PNDH-203 -- provide an important vector toward this deeper target. With approximately 3.0 kilometres of the prospective Mogotes structural corridor remaining untested, Sendero is well positioned to advance Penas Negras during the upcoming drilling season.

Upcoming program

The next drilling campaign will focus on defining the internal architecture of the fertile hydrothermal system within the Mogotes structural corridor, while further advancing the newly identified geochemical targets at PN-NNW and PN-NNE, where rock sampling returned exceptional gold and silver values. These new geochemical targets now extend the potential mineralized system for up to nine kilometres along strike.

Corporate update

Sendero Resources is financed to continue diamond drilling at Penas Negras in the upcoming 2026 to 2027 exploration season. The planned program will target the hydrothermal system which has been observed during the 2026 drilling campaign and internal structure of the Mogotes Fault framework. All of the company's exploration licenses are in good order and in full compliance with the applicable concession terms. The company is delighted to enjoy the support of the government of La Rioja, which has expressed its commitment to supporting Sendero Resources and future exploration at Penas Negras. This support reflects the provincial government's recognition of the geological potential of the Penas Negras district and its confidence in the company's approach to responsible exploration. The company looks forward to continuing to work constructively with provincial and local stakeholders as it advances the project.

About Sendero Resources Corp.

The company is focused on copper-gold exploration at its 100-per-cent owned Penas Negras project in the Vicuna belt in Argentina. The Penas Negras project has similar geological characteristics to other deposits in the Vicuna belt and multiple porphyry and high-sulphidation 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 Penas 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 an 100-per-cent interest on eight additional granted mining concessions covering 91.7 square km. The total project area comprises 211.77 square km.

Qualified person

Steven McMullan, PGeo, a consultant to the company and member of the board supervised the preparation of and reviewed and approved the scientific and technical information pertaining to Penas Negras project contained in this news release. Mr McMullan is a qualified person as defined by National Instrument 43-101 -- Standards of Disclosure for Mineral Projects.

Samples were cut at Sendero Resources' operations facility in La Rioja, Argentina, by company personnel. The HQ-size diamond drill core was sawn and sampled at maximum two-metre intervals, while observing geological contacts.

Both core and rock samples were bagged, tagged, sealed, packaged and transported by company's geologists to the SGS sample preparation laboratory in San Juan, Argentina where they were crushed and an approximately 200-gram split was pulverized to 85 per cent passing 140 mesh. The prepared sample splits were sent to the SGS assay laboratory in Callao, Peru, for gold and silver assays, and multielement ICP. The SGS testing laboratory in Callao, Peru, holds ISO/IEC 17025 accreditation through the American Association for Laboratory Accreditation (A2LA) and is independent of the company. Both core and rock samples were assayed for gold by fire assay fusion with AAS finish on a 50 g sample (FAA515) and multielement suite was assayed by the ICM40B method -- inductively coupled plasma -- mass spectrometry following a four-acid near-total digestion. Samples returning greater than 10 g/t gold are to be reassayed by fire assay with gravimetric finish on a 30 g sample (Au-GRA21). Certified reference materials (standards), blank samples and field duplicates (quarter core samples) were inserted into sampling stream at a rate of approximately 8 per cent. The company's QA/QC protocols have not identified quality problems requiring further action.

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