Mr. Fausto Di Trapani reports

TIERNAN ANNOUNCES RESULTS FROM VOLCAN PROJECT CORE RELOGGING PROGRAM, ADVANCING GEOLOGICAL UNDERSTANDING AND DE-RISKING STRATEGY

Tiernan Gold Corp. has released the results of a comprehensive core relogging and geological modelling program at its Dorado West deposit, part of the company's Volcan project located in the Maricunga gold belt, Atacama region, Chile.

The program, completed between December, 2025, and February, 2026, by Motherlode Consulting Inc., represents a significant step in refining the geological framework of the Dorado West deposit and supports Tiernan's continuing objective of advancing the project engineering and environmental permitting milestones. The Dorado West deposit hosts approximately 94 per cent of the 463 million tonnes of measured and indicated resources containing 9.2 million ounces of gold.

Highlights of the relogging program

• 15,077 metres of core relogged across 27 drill holes, representing approximately 30 per cent of historical diamond drilling;
• 6,353 hyperspectral (Terraspec) measurements collected to enhance hydrothermal alteration characterization;
• 11,598 high-resolution core photographs acquired to support digital geological analysis and future potential machine-learning applications;
• Development of new lithological, structural and alteration domains to support a geologically constrained mineral resource estimate (MRE).

"The Dorado West relogging program represents a fundamental step forward in our understanding of this deposit. By relogging nearly 30 per cent of historical drilling and integrating hyperspectral analysis with structural interpretation, we've confirmed that gold mineralization is primarily controlled by veining and alteration intensity -- not lithology -- which significantly improves our geological model," said Fausto Di Trapani, president and chief executive officer. "Banded stockwork zones averaging 0.80 g/t gold stand out as the primary hosts of gold mineralization, and this new structural framework gives us a more robust basis for the upcoming mineral resource estimate and prefeasibility study."

Key geological findings

The relogging program has resulted in a simplified and improved geological interpretation of the Dorado West deposit:

• Identification of four principal lithological domains: volcanic lava flows, dacitic porphyry, and monomictic and polymictic breccias;
• Confirmation that breccia units with veining and stockwork are the primary host of gold mineralization.

Importantly, the analysis indicates that gold mineralization is not strongly controlled by lithology, but rather by veining, alteration and structural controls.

Strong correlation between gold and alteration and veining

Exploratory data analysis of relogged intervals highlights key controls on mineralization:

• Silicification and white mica alteration show the strongest correlation to gold grades;
• Veining intensity is the primary indicator of gold mineralization, with banded stockwork zones averaging up to 0.80 g/t Au, the highest among all identified domains;
• Banded veins and banded stockwork demonstrate strong associations with higher-grade gold mineralization;
• New structural interpretation identified northeast- and northwest-trending corridors as principal controls, with nine major structures acting as boundaries to high-grade gold zones (greater than one g/t Au).

Enhanced geological modelling

The program enabled the construction of updated geological domains emphasizing spatial continuity and structural coherence:

• New lithological, stockwork and alteration domains developed using three m composites;
• Integration of hyperspectral data allowed for refined alteration domain modelling;
• Structural interpretation incorporated geophysical data, drilling and surface mapping.

These updated domains are expected to provide a more robust framework for future mineral resource estimation and mine planning studies.

Strategic implications

The relogging program significantly advances Tiernan's derisking strategy by:

• Improving confidence in the geological model;
• Providing a stronger basis for a geologically constrained MRE;
• Supporting future metallurgical testing and geometallurgical modelling;
• Establishing a high-quality data set for advanced digital-driven analysis.

Next steps

Tiernan plans to:

• Integrate new domains into the existing block model for grade-tonnage evaluation;
• Assess opportunities to incorporate legacy data to further enhance domain continuity;
• Evaluate digital-driven analysis to extract additional value from the newly acquired high-resolution core photos;
• Continue advancing technical studies in support of the upcoming prefeasibility study.

Qualified person (QP) statement

The scientific and technical data contained in this news release was prepared and reviewed by M. Antonio Celis C., PGeo, under Engineers & Geoscientists of British Columbia (EGBC), an independent qualified person to Tiernan Gold, who is responsible for ensuring that the information provided in this news release is accurate and who acts as a qualified person under National Instrument 43-101 -- Standards of Disclosure for Mineral Projects.

About Tiernan Gold Corp.

Tiernan Gold is focused on the disciplined derisking of the Volcan gold project strategically located in the Atacama region of Chile, on the Maricunga gold belt, a jurisdiction that has a long-established history of mining with a number of operating mines, new mines under construction and major projects being developed.

We seek Safe Harbor.