Sendero's 3D Model Flags Multiple Porphyry-Epithermal Targets at Peñas Negras

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1. As of the date of this article, officers, contractors, shareholders, and/or employees of Streetwise Reports LLC (including members of their household) own securities of Sendero Resources Corp. 
2. Cori Fisher wrote this article for Streetwise Reports LLC and provides services to Streetwise Reports as an employee. 
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1. Ownership and Share Structure Information

The information listed above was updated on the date this article was published and was compiled from information from the company and various other data providers.

Sendero Resources Corp. (SEND:TSX.V) released results on October 8, 2026, from advanced 3D inversion and classification of airborne magnetic survey data at its Peñas Negras Project in La Rioja, Argentina, where it owns 120 km² of concessions and has an option to earn a 100% interest in an additional 91.7 km².

The model, extending to approximately 3 km (kilometers) depth, identifies multiple kilometer-scale magnetic bodies interpreted as oxidized intrusions, a preserved lithocap across much of the project, and near-vertical magnetite-destructive alteration zones that may mark deep fluid pathways.

Key Investor Takeaways

• Sendero's October 8, 2026, 3D magnetic model provides the first project-scale view to 3 km depth, highlighting multiple intrusive centers and a preserved lithocap at Peñas Negras.
• Targets align with porphyry Cu-Au-Mo (copper-gold-molybdenum) and high-sulfidation epithermal settings seen in the Vicuña Belt, where peers such as Filo del Sol and Josemaria are advancing development-stage assets.
• Historical data reinterpreted with a consistent methodology show an interval of 24 m at 1.53% CuEq in hole PNDH-06, providing historical context for the new exploration model.
• The company is fully funded for the upcoming drilling, with the model guiding tests of untested magnetic bodies beneath known mineralization.
• Positioning near operating and advanced projects in the Vicuña Belt offers district-scale context without direct operational overlap.

3D Magnetic Model at Peñas Negras

The interpretation points to key ingredients associated with porphyry districts in the Vicuña Belt, including fertile intrusions, deep-rooted structures, multiple mineralizing centers, and a preserved lithocap.

Sendero's Interim CEO, Jeremy Gillis, stated in the release, "For the first time, we can see Peñas Negras in three dimensions. The model shows several large intrusive centers, a preserved lithocap, and deep structures. Together, they point to a potential cluster of mineralized systems rather than a single target, with settings for both epithermal and porphyry-style mineralization."

Peñas Negras sits approximately 12 km north-northeast of the Josemaria resource area, 18 km southeast of Lundin Mining Corp.'s (LUN:TSX; LUNMF:OTCMKTS) Caserones mine, 24 km northeast of NGEx Minerals Ltd's. (NGEX:TSX) Lunahuasi project, and 32 km north-northeast of the BHP Group Ltd. (BHP:NYSE; BHPLF:OTCPK)-Lundin Mining Filo del Sol development-stage project. The 3D model highlights similarities in geological characteristics to other deposits in the Vicuña Belt, with stacked lithocap layers suggesting multiple hydrothermal events and intrusions rising close to surface at targets such as Cerro Verde Norte. Historical drilling by Anglo American Plc. (AAL:LSE) at Cerro Verde Norte intersected lithocap hydrothermal breccia near surface and granitic intrusive rocks at depth, consistent with the geometry predicted by the model. However, it has not been determined whether the granite represents a mineralizing intrusion or older basement. Recent reconnaissance drilling in 2026 at Cerro Verde Sur intersected anomalous gold in the lithocap but did not reach the interpreted magnetic body below, which remains untested.

Peñas Negras covers 211.77 km², comprising 120 km² of concessions owned by Sendero and approximately 91.7 km² of adjoining concessions subject to an option to earn a 100% interest. The project features district-scale exploration potential along a prospective 9 km trend. In September 2026, Sendero rebuilt its drill assay database from 77 historical holes and 6,433 samples, applying a consistent CuEq methodology. Earlier in August 2026, three reconnaissance holes totaling 396.3 m confirmed near-surface gold and silver mineralization and geochemical vectors.

Gold and Copper Prices Supported by Investment Demand

Gold prices have recovered over the last week. They opened above US$4,200 per ounce on October 12, 2026, before retreating as investors weighed geopolitical developments and expectations for Federal Reserve policy. Yahoo!Finance reported that December gold futures opened at US$4,220.80 per ounce before falling to US$4,204.20. Despite this recent volatility, investment demand remains supportive: the World Gold Council reported that physically backed gold ETFs attracted US$10 billion in September, bringing third-quarter inflows to a record US$31 billion. Global ETF holdings rose by 67 tonnes to a record 4,256 tonnes during the month.

Gold's near-term direction remains sensitive to interest rates, inflation expectations, currency movements, and geopolitical developments. Higher oil prices and Treasury yields can weigh on the metal by increasing the opportunity cost of holding a non-yielding asset, while central-bank purchases and investment flows provide potential support.

Bob Moriarty of 321gold.com wrote,"Sendero has a new management [team]. They are sitting on what might be a copper/gold elephant surrounded by a herd of other mature copper/gold elephants. With a couple of million in the bank, it's long past time to get the truth detector working."

For gold exploration and development companies, prices above US$4,000 per ounce offer a potentially favorable commodity backdrop, although market volatility can affect investor sentiment, financing conditions, and project economics.

Copper prices rose on October 12 amid supply concerns and expectations for stronger Chinese demand.

The Wall Street Journal reported gains in copper, while Shanghai Metals Market reported an overnight close of US$14,550 per tonne, up 1.79%. Copper's longer-term demand outlook is supported by electrification, renewable energy, electric vehicles, power-grid investment, and data-center construction. However, the International Copper Study Group projected refined copper surpluses of approximately 96,000 tonnes in 2026 and 377,000 tonnes in 2027, despite constrained concentrate availability.

For exploration and development companies, both metals offer opportunities alongside risks. Elevated gold prices and continued investment demand may support gold project economics, while copper's role in electrification and concerns about mine supply could sustain interest in new discoveries. Still, commodity-price volatility, changing demand forecasts, permitting requirements, infrastructure availability, and project-development costs can affect metal prices and project economics.

New Management as Worth Watching?

On October 9, 2026, Bob Moriarty of 321gold.com weighed in on the company, stating, "Sendero has a new management [team]. They are sitting on what might be a copper/gold elephant surrounded by a herd of other mature copper/gold elephants. With a couple of million in the bank, it's long past time to get the truth detector working."

Exploration to Continue

According to the company's website, Sendero's next step consists of further exploration and planned drilling to test priority targets along a prospective 9 km trend, including untested sections of the Mogotes structural corridor, as the company advances its search for concealed copper-gold mineralization.

Ownership & Share Information¹

Sendero Resources Corp. had approximately 26.55 million shares outstanding, according to the company's investor information. At a share price of CA$0.85, this implies a market capitalization of approximately CA$22.57 million. The company's 52-week trading range was CA$0.62 to CA$2.19.

Institutions own 3.45% of shares, while Management & Insiders own 16.43%. 

Frequently Asked Questions

Q: What does the 3D magnetic model reveal about Peñas Negras?

A: The model classifies the magnetic data into four interpreted units: a thin, flat-lying lithocap; magnetite-destructive alteration associated with root zones; andesitic volcanic host rock; and steep, pipe-like bodies interpreted as intrusions. These features support the company's interpretation of potential for multiple mineralized systems, but the geological interpretations remain preliminary and require further testing.

Q: How does Peñas Negras compare to nearby Vicuña Belt projects?

A: The project shares geological traits with deposits such as Filo del Sol and Josemaria, located within tens of kilometers, including preserved upper levels of hydrothermal systems and proximity to major operators like Lundin Mining and BHP.

Q: What are the next steps for Sendero?

A: The company plans to use the model to target hydrothermal systems along the Mogotes Fault framework in the upcoming fully funded drill campaign.

Q: What is a 3D magnetic inversion model in mineral exploration?
A: A 3D magnetic inversion model uses magnetic survey data and mathematical techniques to estimate the distribution and geometry of magnetic rocks beneath the Earth's surface. Exploration companies use these models to identify potential intrusive bodies, geological structures, and alteration zones that may be associated with mineral deposits. Sendero Resources applied this technique to airborne magnetic survey data at its Peñas Negras Project in Argentina, modeling geological features to approximately 3 km depth.
Q: What is a porphyry copper-gold deposit?
A: A porphyry copper-gold deposit is a large mineral system in which copper, gold, and sometimes molybdenum occur within or around intrusive igneous rocks. These deposits often form through the circulation of hot, mineral-rich fluids and can extend across large areas. Sendero Resources is investigating potential porphyry copper-gold-molybdenum mineralization at Peñas Negras within Argentina's Vicuña Belt.
Q: What is a lithocap in mineral exploration?
A: A lithocap is a zone of intensely altered rock that can form near the upper levels of certain hydrothermal systems, often through the action of acidic fluids. Lithocaps can occur above porphyry deposits and may indicate the presence of deeper mineralized systems. Sendero's 3D magnetic model identified a preserved lithocap across much of Peñas Negras, which the company is investigating as part of its broader exploration model.
Q: What is magnetite-destructive alteration in a porphyry system?
A: Magnetite-destructive alteration occurs when hydrothermal fluids react with rocks and reduce or remove magnetite, a naturally magnetic iron oxide mineral. This process can create magnetic lows or contrasts that help geologists identify potential fluid pathways and alteration zones. At Peñas Negras, Sendero's model identified near-vertical magnetite-destructive alteration zones that may indicate pathways for mineralizing fluids at depth.
Q: What is epithermal gold-silver mineralization?
A: Epithermal mineralization forms when relatively shallow hydrothermal fluids deposit metals, commonly gold and silver, within veins, breccias, or altered rocks. High-sulfidation epithermal systems can occur near the upper portions of larger porphyry copper-gold systems, making them important exploration targets. Sendero Resources is evaluating Peñas Negras for both epithermal and deeper porphyry-style mineralization based on its geological mapping, historical drilling, and 3D magnetic model.