Announcement • Jul 29

Tinka Resources Limited Provides Results of Silvia Nw Geophysical Survey and Outlines Copper Targets

Tinka Resources Limited provided an update of the results of a recent geophysical survey at its 100%-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. Ground magnetotellurics (MT) has identified two compelling untested geophysical targets at the Silvia NW copper-gold project. The 4 km² survey was completed in June 2026 to evaluate the potential for copper-gold skarn and porphyry mineralization. The MT survey identified a large, moderately conductive (low-resistivity) anomaly extending from approximately 500 m 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 1 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% copper and 0.26 g/t gold from 18.5 metres depth in hole S25-001, and 23.2 metres grading 0.20% copper and 0.05 g/t gold from 231.8 metres depth in hole S25-004. The true width of these intercepts is estimated to be 70-75% 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. Additional 3D modelling and interpretation of the MT survey are underway. 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. 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 4 km² 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 3D 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 1 km further 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% copper and 0.26 g/t gold from 18.5 metres in hole S25-001, and 23.2 metres grading 0.20% copper and 0.05 g/t gold from 231.8 metres in hole S25-004. These drill results were released in February 2026. The true width of these intercepts is estimated to be 70-75% 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. Additional 3D modelling and interpretation of the MT survey are underway. 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.

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