Dr. Graham Carman reports

TINKA PROVIDES RESULTS OF SILVIA NW GEOPHYSICAL SURVEY AND OUTLINES COPPER TARGETS

Tinka Resources Ltd. has provided an update of the results of a recent geophysical survey at its 100-per-cent-owned Silvia NW copper-gold project in Peru, highlighting the potential for both skarn- and porphyry-style copper-gold mineralization within one of the country's most prospective copper belts.

Highlights:

• Ground magnetotellurics (MT) has identified two compelling untested geophysical targets at the Silvia NW copper-gold project. The four-square-kilometre survey was completed in June, 2026, to evaluate the potential for copper-gold skarn and porphyry mineralization. Silvia is located approximately 100 kilometres south of the Antamina copper-zinc mine.
• The MT survey identified a large, moderately conductive (low-resistivity) anomaly extending from approximately 500 metres to over 1,000 m depth beneath Area B where skarn, intrusive breccia and anomalous surface copper mineralization have been identified at surface. The low-resistivity (conductive) anomaly has not been drill tested. A second anomaly, also untested, occurs approximately one km to the north.
• New geophysical targets build on encouraging results from maiden drilling program at Area A. Four drill holes completed in 2025 intersected copper-gold skarn mineralization including 15.1 metres grading 0.17 per cent copper and 0.26 gram per tonne gold from 18.5 metres depth in hole S25-001, and 23.2 metres grading 0.20 per cent copper and 0.05 g/t gold from 231.8 metres depth in hole S25-004 (see news release Feb. 26, 2026). The true width of these intercepts is estimated to be 70-75 per cent of the downhole intercepts.
• The company interprets the drilled target at Area A to represent a low-grade copper skarn halo with potential for stronger skarn and/or porphyry mineralization at depth associated with the newly identified low-resistivity (conductive) anomalies. This interpretation remains conceptual and will require drill testing.
• Additional 3-D modelling and interpretation of the MT survey are under way. The results will be incorporated into planning for the next phase of exploration with follow-up drilling at Silvia NW being evaluated for early 2027.

Dr. Graham Carman, president and chief executive officer of Tinka, stated: "We are encouraged by the results of the MT geophysical survey at Silvia NW, which has identified two compelling drill targets that support our exploration model for the project. The main conductive anomaly coincides with mapped skarn, intrusive breccia and surface copper mineralization at Area B, while copper-gold skarn mineralization intersected in initial drill holes at Area A are interpreted as occurring within a low-grade copper skarn halo. Over all, the new geophysical results strengthen our confidence in the project's potential. We are now completing a detailed 3-D interpretation of the geophysical data, which will guide the next phase of exploration as we evaluate a follow-up drilling program in 2027.

"At Ayawilca, we are making good progress in our discussions with local communities to extend the social agreements. Our expectations remain that the first of these agreements will be coming before the end of Q3 and that activities on site will ramp up shortly thereafter."

Silvia project MT geophysics

A ground magnetotellurics (MT) geophysical survey at the Silvia NW copper-gold target was completed in June, 2026, identifying two low-resistivity (conductive) anomalies considered prospective for copper-gold skarn and/or porphyry mineralization. The survey covered approximately four square km at elevations ranging from 4,300 to 4,800 metres and comprised 65 MT stations collected on approximately 250-metre spacings. Arce Geofisicos acquired the MT data and provided the initial processed results and 3-D inversions.

The main low-resistivity (conductive) anomaly is located beneath Area B extending from approximately 500 m to over 1,000 m depth. A second conductivity anomaly was identified approximately one km farther to the north. Neither anomaly has been tested by drilling. Low-resistivity (conductive) features may be associated with hydrothermal alteration and/or sulphides associated with porphyry and skarn systems.

The low-resistivity feature at Area B coincides with favourable surface geology including skarn alteration of limestone (predominantly garnet-pyroxene prograde skarn) associated with monzonite porphyry dikes and intrusive breccia. Minor zones of copper mineralization occur within the mapped skarn outcrops and within intrusive breccia.

The new geophysical results complement encouraging copper-gold mineralization intersected in drilling at Area A in 2025, including 15.1 metres grading 0.17 per cent copper and 0.26 g/t gold from 18.5 metres in hole S25-001, and 23.2 metres grading 0.20 per cent copper and 0.05 g/t gold from 231.8 metres in hole S25-004. These drill results were released in February, 2026 (see news release dated Feb. 26, 2026). The true width of these intercepts is estimated to be 70 to 75 per cent of the downhole intercepts. The copper mineralization is associated with chalcopyrite hosted by skarn (alteration of limestone) and porphyry dikes. The company interprets Area A to represent a lower-grade copper skarn halo, with potential for stronger subjacent skarn and/or porphyry mineralization associated with the newly identified conductivity anomalies. This interpretation remains conceptual and will require drill testing.

Investing News Network

Tinka has entered into an advertising and investor awareness campaign with Dig Media Inc. doing business as Investing News Network (INN). INN is a private company headquartered in Vancouver, Canada, dedicated to providing independent news and education to investors since 2007. For the 12-month term of the agreement, INN will provide advertising to increase awareness of the company. The cost of the 12-month campaign is $55,000 plus applicable taxes, payable on a quarterly basis. INN currently holds no securities in Tinka.

About Tinka Resources Ltd.

Tinka is an exploration and development company focused on base and precious metals projects in Peru. The company's flagship property is the Ayawilca project which has substantial mineral resources of zinc and silver, a separate tin resource, and the near-surface Colquipucro silver deposit. The nearby Silvia NW copper-gold project is a skarn and porphyry target. The company filed a National Instrument 43-101 technical report1 on an updated PEA (preliminary economic assessment) for the Ayawilca project on April 15, 2024. Dr. Graham Carman, Tinka's president and chief executive officer, has verified, reviewed and approved the technical contents of this release. Dr. Carman is a fellow of the Australasian Institute of Mining and Metallurgy, and is a qualified person as defined by National Instrument 43-101.

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