Dr. Paul Gow reports

TRIBECA RESOURCES EXTENDS NEWLY DISCOVERED SHALLOW COPPER-GOLD SYSTEM AT CHIRSPOSO SUR TARGET TO 650M STRIKE LENGTH

Tribeca Resources Corp. has released 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 (iron oxide copper-gold) project in northern Chile.

Highlights:

• Magnetite breccias are interpreted to be continuous between drill holes over a 650-metre strike length.
• Drill hole CSS002 hosts a 140-metre downhole interval of mineralized magnetite breccia with an average grade of 0.18 per cent CuEq (copper equivalent).
• Three for three: All three targets drilled at La Higuera (Gaby, Chirsposo and Chirsposo Sur) have intersected copper-gold mineralization, within four kilometres of each other on concessions now 100 per cent 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, four kilometres to the north, where Tribeca previously drilled 268 metres at 0.66 per cent copper and 0.14 gram per tonne gold, including 90 metres at 1.02 per cent copper.
• 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 chief executive officer Dr. Paul Gow commented: "The final assay results from the Chirsposo Sur maiden drilling program indicate the system is copper bearing over at least 650 m 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, 600 m to the north.

"The discovery of this third mineralized system at La Higuera validates our recent decision to acquire 100-per-cent 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 to June of this year, with final assay results now received. The program comprised four diamond drill holes sited within a 1,000-metre-long gravel-covered magnetic target. All four holes encountered copper-gold mineralization in magnetite veins and/or breccias, with the three holes on the main magnetic target (CSS001, CSS002 and CSS004) intersecting the more extensive zones of mineralization. The three holes extend this newly discovered copper-gold system to a 650-metre strike length, with the magnetic target remaining open to both the north and south.

The results from the first and northernmost hole (CSS001) were reported in Tribeca's news release dated Oct. 6, 2026, and comprised a shallow mineralized interval of 67 metres at 0.52 per cent copper and 0.15 gram per tonne gold from 71 metres. 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 140 metres from 93 metres depth in CSS002 averages 26.8 per cent iron. Metallurgical test work on the Gaby drill core in 2006 produced a magnetite concentrate with a grade of 69.4 per cent iron, although there is no guarantee this would be reproduced at Chirsposo Sur. Iron is not included in the copper equivalent 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.

Drill holes CSS002 to CSS004

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

CSS002 intersected 39 metres of gravel overburden, below which a thick zone of veining and breccia development is present between 92 metres and 254 metres 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 as 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. The host rocks are strongly overprinted by the alteration but appear to be an andesite and a coarse-medium-grained diorite. The andesite dikes 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 315.1 metres after the intensity of veining and presence of small (20-centimetre) breccia bands reduced beyond approximately 250 metres depth.

CSS003 was drilled off the main magnetic trend to test a relatively smaller, but intense, coincident IP (induced polarization) chargeability and low-resistivity anomaly. The hole intersected seven metres of gravel overburden, then significantly less-altered rocks, with only several thin bands (maximum of two metres thick) of magnetite-amphibole-pyrite-plus-or-minus-chalcopyrite mineralization. The hole was terminated at 282.7 metres. Several one- to two-metre intervals reported copper values of 0.11 per cent to 0.36 per cent copper, with a single metre interval reporting plus 1 per cent copper (the overrange copper assay is awaited).

CSS004 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 postmineralization intrusive bodies. Gravel cover is thinner at only 10.5 metres, below which a magnetite-breccia sequence from 10.5 metres to 78 metres is strongly punctuated by postmineralization intrusive bodies, with a thicker multiphase postmineralization intrusive unit present from 78 metres to 176 metres. From 176 metres to 243 metres, another sequence of breccias and postmineralization intrusive units is 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 314.2 metres. The background copper value over most of the drill hole is approximately 500 parts per million, with numerous one-metre- to four-metre-thick intervals of 0.1 per cent to 0.2 per cent 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 one-half NQ core and sent to the Cotecna laboratory in La Serena, Chile. Cotecna is independent of the company. Preparation included crushing the core samples to 70 per cent less than 2.5 millimetres and pulverizing 500 grams of crushed material to better than 95 per cent less than 105 microns. Samples reported herein were assayed using 30-gram-nominal-weight fire assay with AAS finish (Au-FA30) and a multielement 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 per cent 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 chief executive officer 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.

About Tribeca Resources Corp.

Tribeca Resources is a portfolio-driven copper explorer focused on northern Chile. Led by a team with a 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 per cent owned and has seen approximately 14,500 metres of drilling across three distinct mineralized systems. The project is located 60 kilometres north of the major port city of La Serena-Coquimbo in northern Chile, at 450-metre 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.

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