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Vancouver, British Columbia – October 15, 2026 – TheNewswire - Sendero Resources Corp. (TSXV: SEND) (FSE:9O40) (the “Company& or “Sendero&) is pleased to announce that interactive 3D models of its Peñas Negras Project in La Rioja, Argentina are now available on the Company's website. The models let investors and the public explore the 3D magnetic inversion model and historical drillholes described in the Company's news release dated October 8, 2026.

Highlights

• Two interactive models are live: a project-scale model of Peñas Negras, and a detailed model of the La Ollita target.

• The models can be viewed and and interactively controlled directly in a Web browser without the need for additional software

• Each model shows the four magnetic classes from the Gaussian Mixture Model classification together with historical drillholes in their true 3D positions.

• Drillholes are coloured by copper-equivalent (CuEq) grade, so users can see how recalculated historical intercepts sit relative to the interpreted lithocap, root zones and intrusions.

• Users can rotate, toggle layers and cut their own cross sections anywhere in the model.

• The models are available at: https://senderoresources.com/projects/penas-negras/Interactive-3D-Maps

"Last week we showed Peñas Negras in three dimensions for the first time. Now anyone can explore it for themselves," said Jeremy Gillis, Interim CEO of Sendero. "Investors can slice through the model, see where the historical drilling sits relative to the lithocap and the interpreted intrusions, and judge for themselves how much of the system remains untested. The model points to a cluster of mineralized systems rather than a single target, with settings for both epithermal and porphyry-style mineralization. We believe Peñas Negras is a potential mineral district in the making, and we think transparency like this is the best way to show the scale of the opportunity and the target-rich environment."

Peñas Negras model. The district-scale model covers the project area and shows the extent of the lithocap, the distribution of interpreted intrusive centres and the location of historical drilling across the property.

La Ollita model. The detailed model focuses on the La Ollita occurrence, where historical drilling is shallow and sits above an interpreted root zone of magnetite-destructive alteration extending to depth. The deeper part of this system has not been tested.

Exploring the Models

The viewers run in any modern web browser. Users can:

• pan, rotate and zoom the model, or jump to north, south, east, west, top and oblique views;

• switch each magnetic class, the drillholes and CuEq colouring on or off, and view surfaces as solid or wireframe;

• cut cross sections along north–south or east–west lines at any coordinate, or set a custom azimuth and dip;

• draw section lines and display the classes and drillholes along it;

• hover over drillhole collars to identify each hole

What the Interactive Models Show

The models are built from the 3D inversion of airborne magnetic data and its Gaussian Mixture Model (GMM) classification, as reported on October 8, 2026. Each model displays the four magnetic classes as 3D surfaces:

• GMM1: interpreted lithocap, a thin, flat-lying layer across much of the project which is magnetically transparent.

• GMM2: interpreted magnetite-destructive alteration, including near-vertical root zones.

• GMM3: interpreted andesitic volcanic host rock.

• GMM4: interpreted intrusions, forming steep, pipe-like bodies with strong magnetic response.

Historical drillholes are plotted in their original 3D coordinates and coloured by CuEq grade from the Company's rebuilt drill assay database. CuEq calculations follow the assumptions disclosed in the Company&s September 23, 2026 news release.

Qualified Person

Steven McMullan, P. Geo., 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 the Peñas 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.

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 km2. The total project area comprises 211.77 km2.

Further Information

For further information, please contact:

Sendero Resources Corp.,
Jeremy Gillis, Interim Chief Executive Officer
Email: [email protected]

+1 (236) 232-0988

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

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

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.

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