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Tribeca Resources Reports Technical Updates From Field Programs At Jiguata High Sulphidation Porphyry Copper Exploration Project And Provides Drilling Update From La Higuera Project
Tribeca Resources Corporation completed pre-drilling field program at the Jiguata Project and generated geological, geochemical, spectral and geophysical datasets that the Company interprets as consistent with a district-scale porphyry and high sulphidation epithermal cluster. Geological mapping and spectral interpretation have outlined large alteration footprints at the four distinct alteration centres, interpreted as potentially reflecting multiple intrusive centres across the project area. Spectral results show alteration patterns interpreted as consistent with porphyry/epithermal environments, with mineral assemblages indicating epithermal advanced argillic alteration and porphyry-related phyllic alteration. Soil and rock geochemical results present coincident Mo-W-Bi ± Cu anomalism, interpreted as potential porphyry-style pathfinder geochemistry, together with As-Sb-Te ± Ag-Au anomalism typical of lithocap and high sulphidation epithermal environments. Ground magnetic 3D modelling has defined discrete magnetic lows proximal to stronger magnetic highs, interpreted as related to alteration and intrusive bodies, respectively. 3D inversion of the magnetotelluric (MT) geophysical survey has identified a number of resistivity signatures that the Company interprets as consistent with porphyry and epithermal systems, with important coincidence with the historic IP data. The majority of the new data received to date covers the large La Soberana and Cetro Dorado alteration systems, which are shaping up as the initial drill targets. The multi-kilometre extent of the geochemical and geophysical anomalies in this area is highly encouraging. The Jiguata Project is a 10,000 hectare property located in the Tarapacá region in northern Chile. Tribeca holds the Jiguata Project under a five-year purchase option agreement to acquire 100% of the property. Tribeca has extended mapping over much of the property area, with a focus on the exposed alteration systems where erosional windows exist within the overlying thin post-alteration andesitic volcanic unit. On the basis of the geological mapping program, in particular the identified alteration assemblages and observed vein relationships, it is interpreted that the current exposed level at Jiguata represents the upper portion of a preserved porphyry-epithermal system. Results suggest the project is prospective for porphyry-style Cu-Mo-Au mineralization as well as high sulphidation epithermal Au-Cu-Ag mineralization associated with advanced argillic alteration, hydrothermal breccias and vuggy silica bodies. At Cetro Dorado, mapping identified extensive zones of Type D quartz sulphide veinlets within advanced argillic alteration and hydrothermal jarositic breccias coincident with local stockwork vein networks interpreted as having affinity with Type B porphyry-style veining. The combination of advanced argillic alteration, hydrothermal brecciation and porphyry-style vein textures at surface is considered by the Company to support Cetro Dorado as a key potential drill target. La Soberana, the southernmost alteration centre, is characterized by multiple hydrothermal breccia bodies intermittently outcropping over an area approximately 1.8km in strike length spatially associated with extensive advanced argillic alteration. In the southern part of La Soberana, fine banded quartz veinlets and breccia clasts containing grey quartz veinlets were observed and are interpreted as having affinity with “Type B” style porphyry veining. The La Soberana alteration centre hosts the only historic drilling in the project area, with two shallow reverse circulation drill holes completed in 1993 to approximately 250m to 300m depth in the western portion of the system. Geological mapping and surface sampling were completed by independent geological consultants Asesorias Geomineras, with sampling locations, geological observations and alteration features recorded in the field and subsequently compiled for interpretation. Soil and rock chip samples collected during the field program were submitted to ALS Patagonia in Copiapó, northern Chile, for multielement geochemical analysis. A suite of reference standards and duplicates were inserted and submitted with each batch, comprising approximately 10% of the total sample count. The soil samples were analyzed using the ME-MS61L method with gold analyzed by method Au-AA23. The rock samples were analyzed using the ME-MS61 method with gold analyzed by method Au-AA23. The rock chip and soil samples were subject to spectral analysis, also completed by ALS, using a Terraspec instrument, with processing of the spectral data by consultant group GlobalOreAdvisory Pty Limited, based in Brisbane, Australia, using proprietary methods. Geochemical and spectral datasets were compiled and reviewed using ioGAS software and were subject to internal QA/QC review, including checks of sample data, analytical results, spatial relationships and consistency with mapped geology and alteration observations. Areas interpreted as transported surface material or volcanic units with potential to mask underlying hydrothermal responses were considered separately during interpretation. The Company’s geochemical interpretations remain preliminary, as multielement analytical results have been received for 314 of the 672 soil samples collected, together with all 149 rock chip samples. Additional results, once received, will be reviewed and incorporated into the Company’s geological and geochemical interpretation. Ground magnetic data collected over the Jiguata Project in early 2026 by Argali Geofísica were further processed using Vector Residual Magnetic Intensity filtering and analytic signal-based products, including the Vertical Integral of the Analytic Signal, to improve geological interpretation in the project’s low magnetic latitude setting. The processed magnetic data were used to support 3D magnetic inversion modelling and interpretation of magnetic basement architecture, magnetic depletion zones and potential lithological or alteration-related features. The magnetotelluric survey completed over the Jiguata Project was conducted by Southernrock Geophysics and finalized in May 2026. The MT data were processed and modelled using 3D inversion techniques to assess subsurface resistivity variations. MT responses are not diagnostic of mineralization and have been interpreted in the context of lithology, alteration, structure and potential hydrothermal fluid pathways.