(via TheNewswire)

28 APRIL, 2026 | VANCOUVER, BC – TheNewswire – Tribeca Resources Corporation (TSXV: TRBC) (OTCQB: TRRCF) (“ Tribeca Resources ”, the “ Company ”) is pleased to report that drilling is commencing at its La Higuera IOCG Project (“La Higuera”) and to also provide an update on its ongoing field exploration activities at the Jiguata porphyry – high sulphidation copper exploration Project (“Jiguata”), both located in northern Chile.  

Highlights:

• Drilling commencing this week at the previously untested Chirsposo Sur target; one of five targets at Tribeca’s La Higuera Project. An approximate 1,050m three-hole program is planned  

• The Chirsposo Sur target comprises a coincident geophysical anomaly in ground magnetic, gravity and induced polarization datasets, located under thin gravel cover of an estimated maximum 20m depth  

• Jiguata pre-drilling work program expanded to include magneto-telluric (“MT”) geophysical surveying. The MT survey has commenced, with the objective of constraining the location of any intrusive bodies and testing for potential porphyry – high sulphidation sulphide mineralization under the four large alteration systems recently delineated by geological mapping across the project area  

Tribeca Resources CEO, Dr. Paul Gow commented:

“We now have two exciting field campaigns in progress. Drill platforms have been prepared and a diamond drill rig is mobilizing to the Chirsposo Sur target, which we believe displays a similar geophysical signature, magnetite mineralogy and interpreted structural setting to our Gaby IOCG discovery.”

"In addition, MT surveying is now in progress at the Jiguata project in northern Chile, which we believe has potential to host a large Miocene porphyry copper or high sulphidation system. MT surveying typically investigates to a deeper level than traditional IP surveying. We look forward to integrating the MT results with our other systematically collected and high-quality pre-drilling datasets to target drilling to test this large and exciting system.”

The La Higuera Project

The La Higuera district hosts multiple known iron-oxide copper-gold (IOCG) or iron-oxide apatite (IOA) deposits, including the historic La Higuera high-grade underground copper mine, and the large El Tofo magnetite deposit. Tribeca Resources’ La Higuera Project comprises 2,827 hectares of exploration and exploitation licences within the district, and contains five discrete targets (Figure 1). Tribeca’s objective is to develop a district with multiple copper-gold (±iron, ±cobalt) mineral resources as are present in other northern Chilean IOCG districts, such as the Candelaria/Punta del Cobre and the Mantoverde/Santo Domingo districts.

To date, Tribeca has drilled at only two of the five targets. At the Gaby target, Tribeca intersected IOCG-style copper-gold mineralization over a 1.4km strike length. The mineralization is hosted in a north-south trending complex of magnetite-bearing breccias and veins interpreted as related to a strand of the Atacama Fault System. Thick copper-gold zones, up to 285m downhole length (comprising potentially 140m true thickness assuming a vertical orientation) were consistently intersected along the strike length, with a best intersection of 268m @ 0.66% Cu and 0.14 g/t Au in hole GBY001 (see news release dated 30 January 2023). Cobalt and magnetite are also present in the mineralization and could be potential by-products, as proposed for the Santo Domingo project of Capstone Copper further north in the Chilean Coastal IOCG Belt. Preliminary metallurgical test work completed in 2008 on historic drill core from the Gaby mineralization indicated potential to produce a copper-gold concentrate, a magnetite concentrate and a cobalt concentrate (comprised of pyrite) from the mineralization.

Tribeca also completed two diamond holes at the Chirsposo target, approximately 3km south of the Gaby target, intersecting a strong magnetite-dominated hydrothermal alteration system with a best intersection of 167m @ 0.21% Cu from 56m depth. This included an interval of 12m @ 0.91% cu and 0.24 g/t Au (see news release dated 17 May 2023).

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Figure 1. Location of the five targets within the La Higuera project. The locations of the three proposed drill collars at Chirsposo Sur are shown.

Chirsposo Sur target

The Chirsposo Sur Target comprises an interpreted strong hydrothermal magnetite alteration system under thin gravel cover in the southern La Higuera project area. The ground magnetic signature of the alteration system and the interpreted structural setting appear very similar to that at the Gaby discovery, approximately 4km to the north. Both systems display associated magnetic intensities on the order of >2500 nT, and both comprise kilometer-scale, linear, broadly north-south trending, magnetic anomalies that are crosscut by a series of northwest-trending faults (Figure 2). Inversion of the ground magnetic data at Chirsposo Sur indicates the system comprises a steeply dipping magnetite alteration system of 1.2 km strike length. The interpreted body is also coincident with an intense (>30 mV/V) north-south IP chargeability trend that stretches over 2.4km, along with a broadly coincident 0.5-1.0 mGal residual gravity anomaly.

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Figure 2. Same-scale comparison of the ground magnetic data, and interpreted structural settings, from the Gaby and Chirsposo Sur magnetite alteration systems.

Chirsposo Sur drill program

Two historic vertical diamond holes at the Chirsposo Sur Target, drilled approximately 200m to the west of the body (CB-02, CB-03 – Figure 3) intersected IOCG-style alteration with weak copper mineralisation (8m @ 0.23% Cu from 38m in hole CB-02), as reported in the NI 43-101 technical report filed by Tribeca Resources on October 24, 2022 (the “La Higuera Technical Report”). The drill core demonstrated strong magnetite alteration with a coarse-grained pyrite-dominated sulphide assemblage present in hole CB-02.

The planned drill program comprises three diamond holes for approximately 1,050m, with two holes to test discrete magnetic highs within the main magnetic and gravity target (Figure 3), and one hole to the south to test a rare coincident low resistivity anomaly evident in the IP data.

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Figure 3.  Location of the three proposed drill holes at the Chirsposo Sur target, shown in the context of the ground magnetic data.

Jiguata MT geophysical survey

Initial technical information from the recently completed field mapping and sampling activities at Jiguata were reported in Tribeca’s news release dated February 25, 2026. One of the key outcomes from this work was to delineate four large alteration systems (Figure 4) that variably display indications of a high-level hydrothermal system, including associated advanced argillic alteration, silica-alunite breccias, vuggy quartz alteration and dacite domes.

Traditional IP surveying was completed over the area of three of the four alteration systems in 2014, all three of which displayed significant IP chargeability anomalies. MT surveying typically has a greater depth of investigation than conventional IP surveying, such that a combination of the two methods has been shown to work successfully elsewhere in the Miocene Belt further south in Chile and Argentina, with notable examples including the Valeriano and Altar deposits.

The MT surveying at Jiguata is being undertaken to extend the depth range of resistivity information over the four large alteration centres. Results are expected by the second half of May, and will be reported in due course.

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Figure 4.  Location of the four alteration centres delineated at the Jiguata project via mineral mapping utilizing high resolution satellite imagery and field mapping.

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”). Dr. Gow has not verified any of the information regarding any of the properties or projects referred to herein other than the La Higuera IOCG Project , the Jiguata Project and the Chiricuto property. Mineralization on any other properties referred to herein is not necessarily indicative of mineralization on the La Higuera IOCG Project , the Jiguata Project and the Chiricuto property.

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 100%-owned and has seen approximately 10,000m of drilling with mineralization defined over a 1.4 kilometer strike length at the Gaby discovery. Most of the La Higuera Project is held as 100%-owned properties, but with the properties overlying the Gaby target held under a purchase option agreement. The Chiricuto and Jiguata projects are earlier stage porphyry copper-gold-molybdenum targets, held under purchase option agreements.

On behalf of Tribeca Resources Corporation

Cautionary Note

Neither the TSX Venture Exchange Inc. nor its Regulation Service Provider (as that term is defined in the policies of the TSX Venture Exchange Inc.) accepts responsibility for the adequacy or accuracy of this press release.

Forward Looking Information

This press release contains forward-looking statements and information that are based on the beliefs of management and reflect the Company's current expectations. When used in this press release, the words "estimate", "project", "belief", "anticipate", "intend", "expect", "plan", "predict", "may" or "should" and the negative of these words or such variations thereon or comparable terminology are intended to identify forward-looking statements and information. The forward-looking statements and information in this press release include statements regarding the relationship between alteration and rock characteristics identified in geological mapping and potential mineralization, the identification, prioritization and anticipated quality of exploration targets, the interpreted scale, extent and geological significance of alteration systems, the relationship between geophysical results and potential mineralization, the size and timing of the proposed 2026 drill programs, the anticipated effectiveness of exploration methodologies, the integration of new and historic data to define drill targets,  planned exploration activities beyond drilling, the anticipated completion of field activities and commencement of drilling (including the potential for weather-related delays), the use of proceeds from recently completed financings, the ability to secure and maintain necessary permits and approvals and the operations and future plans of the Company, including potential additional drilling and property acquisitions .

Such statements and information reflect the current view of the Company. By their nature, forward-looking statements involve known and unknown risks, uncertainties and other factors, which may cause our actual results, performance or achievements, or other future events, to be materially different from any future results, performance or achievements expressed or implied by such forward-looking statements. Such factors include, among others, risks associated with mineral exploration, including the risk that actual results of exploration will be different from those expected by management and that geological, geophysical and geochemical interpretations may not be confirmed by drilling, risks of delays or interruptions to exploration activities due to weather, logistical or access issues, risks related to obtaining and maintaining necessary permits and approvals, risks related to the availability and retention of key personnel, the ability to raise additional capital, fluctuations in commodity prices and market conditions, the reliability of historic or third-party data, the risk that any mineralization identified may be limited in size, continuity or economic significance, unanticipated costs or environmental liabilities, the risk that new laws or regulations could adversely affect the business and results of operations of the Company and anticipated work on the Company’s projects and other risks inherent in early‑stage mineral exploration projects .

There are several important factors that could cause the Company’s actual results to differ materially from those indicated or implied by forward-looking statements and information. Such factors include, among others: reliance on key management; changes in the credit or security markets; the risk that exploration activities, including drilling, may not result in the discovery of economically viable mineralization; the risk that geological, geophysical or geochemical interpretations may prove inaccurate or incomplete; risks inherent in early‑stage mineral exploration projects for which no mineral resources have been defined; risks related to the Company’s ability to maintain its interest in exploration properties; results of operation activities; unanticipated costs and expenses; fluctuations in commodity prices; the reliability and limitations of preliminary, historic or third ‑ party exploration data; and general market and industry conditions. The Company cautions that the foregoing list of material factors is not exhaustive. When relying on the Company's forward-looking statements and information to make decisions, investors and others should carefully consider the foregoing factors and other uncertainties and potential events.

The Company has assumed that the material factors referred to in the previous paragraph will not cause such forward-looking statements and information to differ materially from actual results or events. The forward-looking information contained in this press release represents the expectations of the Company as of the date of this press release and, accordingly, is subject to change after such date. Readers should not place undue importance on forward looking information and should not rely upon this information as of any other date. While the Company may elect to, it does not undertake to update this information at any particular time except as required in accordance with applicable laws.

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