12 NOVEMBER 2026 | VANCOUVER, BC

Tribeca Resources Extends Newly Discovered Shallow Copper-Gold System at Chirsposo Sur Target to 650m Strike Length

Tribeca Resources Corporation (TSXV: TRBC) (OTCQB: TRRCF) (“Tribeca Resources”, the “Company”) is pleased to report assay results from the final three of four drill holes completed during the maiden drill program at the discrete Chirsposo Sur target at its La Higuera IOCG Project (“La Higuera”) in northern Chile.

Highlights:

• Magnetite breccias are interpreted to be continuous between drill holes over a 650m strike length
• Drill hole CSS002 hosts a 140m downhole interval of mineralized magnetite breccia with an average grade of 0.18% CuEq
• Three for three: all three targets drilled at La Higuera (Gaby, Chirsposo and Chirsposo Sur) have intersected copper-gold mineralization, within 4km of each other on concessions now 100% owned by Tribeca, supporting the interpretation of La Higuera as an emerging IOCG district
• Gaby “look-alike”: mineralization at Chirsposo Sur closely resembles that at Gaby, 4km to the north, where Tribeca previously drilled 268m at 0.66% Cu and 0.14 g/t Au, including 90m at 1.02% Cu
• Geological mapping has commenced at the main Chirsposo target to the north to investigate if Chirsposo Sur and the main Chirsposo target are linked

Tribeca Resources CEO, Dr. Paul Gow commented:

“The final assay results from the Chirsposo Sur maiden drilling program indicate the system is copper bearing over at least 650m of strike length. The magnetite breccias intersected provide evidence of geological continuity from hole to hole, consistent with our interpretation that they are hosted by a strand of the regionally extensive Atacama Fault System.“

“We are currently planning for the next phase of drilling at the newly discovered Chirsposo Sur mineralized system, with a particular focus on understanding if the newly discovered mineralization continues and merges with that previously drilled at the Chirsposo target, 600m to the north.”

“The discovery of this third mineralised system at La Higuera validates our recent decision to acquire 100% control of the broader La Higuera Project. We now intend to fast-track exploration at La Higuera. Our objective remains to grow and define the three mineralized systems at the project; and seek to add further scale, by testing two remaining undrilled targets.”

Chirsposo Sur drill program

Tribeca’s maiden Chirsposo Sur drill program was completed in May-June of this year, with final assay results now received. The program comprised four diamond drill holes sited within a 1000m long gravel-covered magnetic target  (Figure 1). All four holes encountered copper-gold mineralization in magnetite veins and/or breccias, with the three holes on the main magnetic target (CSS001, CSS002, CSS004) intersecting the more extensive zones of mineralization. The three holes extend this newly discovered copper-gold system to a 650m strike length, with the magnetic target remaining open to both the north and south.

The results from the first and most northern hole (CSS001) were reported in Tribeca’s news release dated October 6, 2026 and comprised a shallow mineralized interval of 67m @ 0.52% Cu and 0.15 g/t Au from 71m. Holes CSS002 and CSS004 intersected extensively developed magnetite breccia intervals, and while the brecciated and/or mineralized intervals are thicker the grade is lower. The significant mineralized intervals from the final three holes of the program are provided in Table 1.

The mineralization evident in holes CSS001, CSS002 and CSS004 appears mineralogically similar to the mineralization intersected at the Gaby discovery to the north. This includes high iron values, with much of this iron visibly present within magnetite. For example, the higher copper interval of 140m from 93m depth in CSS002 averages 26.8% Fe. Metallurgical test work on the Gaby drill core in 2006 produced a magnetite concentrate with a grade of 69.4% iron, although there is no guarantee this would be reproduced at Chirsposo Sur. Iron is not included in the CuEq values reported in this release (see Table 1 and associated footnote).

A total of 1,241m was drilled and collar details of the four holes are included in Table 2.

Figure 3. Cross-section illustrating the geology intersected in drill hole CSS002. The key thick mineralized zone is located between 93m and approximately 233m associated with magnetite breccias. The andesite hosts the magnetite-sulphide breccias and veining, and has subsequently been intruded by late dykes and a diorite that host minimal mineralization.

Drill holes CSS002 to CSS004

Summary geological observations from holes CSS002 to CSS004 were previously outlined in the news release of October 6, 2026, but are updated below to accompany the assay results reported in this news release:

• CSS002: intersected 39m of gravel overburden, below which a thick zone of veining and breccia development is present between 92m and 254m associated with strong magnetite alteration. The veining and alteration style is broadly similar to that seen in CSS001, with sulphide minerals present including pyrite, chalcopyrite and locally pyrrhotite, with pyrite the dominant sulphide. CSS002 appears to have a lesser amount of the Association 2 coarse-grained pyrite-chalcopyrite mineralization than CSS001, but significantly more pyrrhotite, locally in a semi-massive occurrence (Figure 4). The host rocks are strongly overprinted by the alteration, but appear to be an andesite and a coarse-medium grained diorite. The andesite dykes seen in CSS001 are also present in CSS002, along with some felsic dikes, but appear as thinner intervals and are generally less volumetrically important. The hole was terminated at 315.1m after the intensity of veining and presence of small (<20cm) breccia bands reduced beyond approximately 250m depth.
• CSS003: was drilled off the main magnetic trend (Figure 2) to test a relatively smaller, but intense, coincident IP chargeability and low resistivity anomaly. The hole intersected 7m of gravel overburden, then significantly less-altered rocks, with only several thin bands (maximum of two metres thick) of magnetite-amphibole-pyrite±chalcopyrite mineralization. The hole was terminated at 282.7m. Several 1-2m intervals reported copper values of 0.11%-0.36% Cu, with a single metre interval reporting +1% copper (the over-range copper assay is awaited).
• CSS004: this hole was added to the program after holes CSS001 and CSS002 reinforced the very strong association between the breccia and sulphide-bearing systems and the intense north-south magnetic anomaly. This hole was much more strongly dominated at shallow depths by post-mineralization intrusive bodies. Gravel cover is thinner at only 10.5m, below which a magnetite-breccia sequence from 10.5m to 78m is strongly punctuated by post-mineralization intrusive bodies, with a thicker multiphase post-mineralization intrusive unit present from 78m to 176m. From 176m to 243m another sequence of breccias and post-mineralization intrusive units are present, below which a medium- to coarse-grained diorite is much less altered and only crosscut by thin bands of sulphide-bearing veining or brecciation. The hole was terminated at 314.2m. The background copper value over most of the drillhole is approximately 500ppm, with numerous 1m to 4m thick intervals of 0.1%-0.2% copper.

Given the lack of outcrop in this gravel-covered area and the presence of only one hole per section, the orientation of the mineralized breccias is not constrained and the true thickness of mineralization is unknown.

Notes on sampling and assaying

Analytical samples were produced using ½ NQ core and sent to the Cotecna laboratory (“Cotecna”) in La Serena, Chile. Cotecna is independent of the Company. Preparation included crushing the core samples to 70% < 2.5mm and pulverizing 500g of crushed material to better than 95% < 105 microns. Samples reported herein were assayed using 30g nominal weight fire assay with AAS finish (Au-FA30) and a multi-element four acid digest ICP-OES method (OES-TD36). The QA/QC procedure for this drilling program utilizes field duplicates, standards and blanks that comprise approximately 10% of the total samples submitted.

Qualified Person

All scientific and technical information in this press release has been prepared by, or approved by, Dr. Paul Gow, who is the CEO of Tribeca Resources. He is a Member of the Australian Institute of Geoscientists (MAIG), a Member of the Australasian Institute of Mining and Metallurgy (MAusIMM) and a qualified person for the purposes of National Instrument 43-101 – Standards of Disclosure for Mineral Projects (“NI 43-101”).

About Tribeca Resources

Tribeca Resources is a portfolio-driven copper explorer focused on northern Chile. Led by a team with a track-record of discovery and significant equity ownership, Tribeca Resources’ objective is to discover the mineral resources for the next generation of copper mines in Chile.

Tribeca Resources’ flagship La Higuera IOCG Project is now 100%-owned and has seen approximately 14,500m of drilling across three distinct mineralised systems. The project is located 60 kilometers north of the major port city of La Serena-Coquimbo in northern Chile, at 450m altitude with easy road access. The Chiricuto and Jiguata projects are earlier stage porphyry copper-gold-molybdenum targets, held under purchase option agreements. The Jiguata project now has defined drill targets.

On behalf of Tribeca Resources Corporation

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