Tribeca Resources Reports Final Assay Results from Chirsposo Sur Drilling, La Higuera Project

VANCOUVER, BC — November 12, 2026 — Leads & Copy — Tribeca Resources Corporation (TSXV: TRBC) (OTCQB: TRRCF) has reported assay results from the final three drill holes of its maiden drill program at the Chirsposo Sur target within its La Higuera IOCG Project in northern Chile. The results indicate copper-bearing mineralization over a strike length of at least 650 meters, with magnetite breccias showing continuity between drill holes.

Drill hole CSS002 intersected a significant 140-meter downhole interval of mineralized magnetite breccia with an average grade of 0.18% CuEq. This finding contributes to the growing evidence that La Higuera is an emerging IOCG district, with all three targets drilled to date—Gaby, Chirsposo, and Chirsposo Sur—intersecting copper-gold mineralization. These targets are located within 4 kilometers of each other on concessions now wholly owned by Tribeca Resources.

The mineralization at Chirsposo Sur closely resembles that found at the Gaby target, situated 4 kilometers to the north. In a previous drilling program at Gaby, Tribeca Resources reported an intersection of 268 meters grading 0.66% Cu and 0.14 g/t Au, including a higher-grade section of 90 meters at 1.02% Cu. Geological mapping has now commenced at the main Chirsposo target to determine if Chirsposo Sur and the main Chirsposo target are connected.

Dr. Paul Gow, CEO of Tribeca Resources, commented on the findings, stating, "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."

The company is planning the next phase of drilling at Chirsposo Sur, with a focus on investigating whether the newly discovered mineralization extends and merges with the mineralization previously drilled at the Chirsposo target, located 600 meters to the north. Dr. Gow added, "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."

The Chirsposo Sur drill program, completed in May-June of this year, comprised four diamond drill holes on a 1000-meter long magnetic target. All four holes encountered copper-gold mineralization in magnetite veins and/or breccias. The three holes situated on the main magnetic target (CSS001, CSS002, CSS004) intersected more extensive zones of mineralization, extending the newly discovered copper-gold system to a 650-meter strike length. The magnetic target remains open to the north and south.

Results from CSS001, the northernmost hole, were previously reported on October 6, 2026, showing a shallow mineralized interval of 67 meters grading 0.52% Cu and 0.15 g/t Au from 71 meters. Holes CSS002 and CSS004 intersected extensively developed magnetite breccia intervals with lower grades but thicker mineralized zones.

The mineralization observed in CSS001, CSS002, and CSS004 is mineralogically similar to that found at the Gaby discovery, characterized by high iron values predominantly in magnetite. For instance, a 140-meter interval in CSS002 from 93 meters depth averages 26.8% Fe. While metallurgical test work on Gaby drill core in 2006 produced a magnetite concentrate with a 69.4% iron grade, there is no guarantee of similar results at Chirsposo Sur. Iron content is not included in the reported CuEq values.

A total of 1,241 meters were drilled across the four holes. Significant mineralized intersections from CSS002 and CSS004 include intervals such as 140 meters grading 0.18% CuEq from 93 meters in CSS002, and 4 meters grading 0.74% CuEq from 30 meters in CSS004.

Detailed geological observations from holes CSS002 to CSS004 were provided, noting the presence of veining, breccia development, and strong magnetite alteration. CSS002 intersected a thick zone of veining and breccia development between 92 meters and 254 meters. CSS003, drilled off the main magnetic trend, encountered significantly less-altered rocks with only thin bands of mineralization. CSS004 was characterized by a strong presence of post-mineralization intrusive bodies at shallow depths, with breccias and mineralization found between 10.5 meters and 78 meters, and again from 176 meters to 243 meters.

The orientation of the mineralized breccias and the true thickness of the mineralization are not yet constrained due to the lack of outcrop and the limited number of drill holes per section. Analytical samples were processed by Cotecna laboratory in La Serena, Chile, with QA/QC procedures including field duplicates, standards, and blanks.

Dr. Paul Gow, CEO of Tribeca Resources, is the Qualified Person responsible for the scientific and technical information in this press release, as a Member of the Australian Institute of Geoscientists and the Australasian Institute of Mining and Metallurgy.

Tribeca Resources is a copper explorer focused on northern Chile, aiming to discover mineral resources for future copper mines. Its flagship La Higuera IOCG Project is 100%-owned and has undergone approximately 14,500 meters of drilling across three mineralized systems. The project is located north of the port city of La Serena-Coquimbo.

Source: Tribeca Resources Corporation