Mr. Juan Enrique Rassmuss reports

TINTINA MINES LIMITED ANNOUNCES POSITIVE PRELIMINARY ECONOMIC ASSESSMENT WITH PRE-TAX NPV OF US$ 560 MILLION AND 26-YEAR MINE LIFE

Tintina Mines Ltd. has released the results of a preliminary economic assessment (PEA) for its 74-per-cent-owned Domeyko Sulfuros copper-gold project located in the Atacama region, Chile. The PEA, prepared by SRK Consulting (Chile) SpA, demonstrates robust economics for a long-life, medium-scale porphyry development with significant district-scale expansion upside.

PEA financial and operational highlights (base case: $4.30 (U.S.)/pound Cu (copper), $2,500 (U.S.)/ounce Au):

• Net present value (NPV): pretax NPV (net present value) (8 per cent) of $560-million (U.S.), after-tax NPV (8 per cent) of $328-million (U.S.);
• Life of mine (LOM): 26-year operation producing 945,000 tonnes (2.1 billion pounds) of recovered copper and 1.5 million ounces of gold. Base case assumes a mining rate of 164,000 tpd (tonnes per day) and a processing rate of 35,000 tpd with metallurgical recoveries of approximately 88.2 per cent for copper and 64.6 per cent for gold.
• Capital requirements: Initial capital of $1,283-million (U.S.) (including 35 per cent contingency on plant and infrastructure), deferred/sustaining capital of $905-million (U.S.).
• ESG (environmental, social and governance) integration: 100-per-cent renewable energy power strategy with BESS support, raw seawater processing via a dedicated 63-kilometre pipeline ensuring zero consumption of continental water.

President's statement

Juan Enrique Rassmuss, Tintina's president and chairman, comments:

"The PEA provides a strong technical and economic foundation to advance Domeyko Sulfuros to the next stage of development, and we believe the project offers meaningful opportunities for further optimization and value enhancement as additional technical work is completed.

"Furthermore, the resource at Dos Amigos is merely the anchor for a broader district that includes the high-priority Tricolor and Maria Soledad targets, providing a clear path for resource growth and project rerating."

Detailed mineral resource statement (effective Jan. 23, 2026)

The resource model is based on 21,800 metres of drilling and follows CIM (Canadian Institute of Mining) Best Practice Guidelines.

Domeyko Sulfuros investment profile

With a pretax NPV of $560-million (U.S.) and a 26-year mine life, Domeyko Sulfuros offers long-duration exposure to the copper-gold cycle from a large-scale sulphide system in northern Chile. The use of 100-per-cent renewable power and raw seawater processing directly addresses the key environmental constraints of mining in the Atacama Desert, supporting a resilient and sustainable development strategy.

While the PEA establishes a robust economic baseline, the principal value driver is district-scale exploration upside. The 357 Mt Dos Amigos resource represents the initial anchor of a broader porphyry system that remains open in multiple directions, with high-priority targets at Tricolor and Maria Soledad.

Domeyko Sulfuros combines excellent infrastructure access, a well-established social licence and significant geological growth potential. The project is located adjacent to Route 5, within 53 kilometres of Vallenar, 63 km of the coast and 104 km of the Port of Las Losas (Huasco), Domeyko Sulfuros is well positioned for efficient development. Existing 110-kilovolt and 220 kV transmission lines support a renewable power solution, supplemented by battery energy storage systems (BESS).

As the project advances toward prefeasibility, key value drivers include the conversion of inferred resources, optimization of gold recovery and the continued advancement of priority exploration targets across the Domeyko district within an established permitting framework. The project benefits from a long-standing and constructive relationship with local communities, developed through operations at the nearby Dos Amigos mine since 1996, and holds the necessary permits to support ongoing brownfield exploration.

For further information regarding the project and the mineral resource estimates referenced herein, refer to the technical report available under the company's profile at SEDAR+ and on the company's website.

Technical disclosure and qualified persons

The preliminary economic assessment is preliminary in nature and includes inferred mineral resources that are considered too speculative geologically to have the economic considerations applied to them that would enable them to be categorized as mineral reserves.

The scientific and technical information and the mineral resources estimate results described in this news release has been reviewed and approved by Joled Nur Paredes (CCCRRM, No. 181), principal mining engineer, and Sophia Bascunan Moraga (CCCRRM, No. 518), senior geologist, both of SRK Consulting Chile SpA. They are independent of Tintina Mines and are qualified persons for the purposes of National Instrument 43-101.

The independent qualified persons for the PEA, as defined by NI 43-101, are:

• Joled Nur Paredes, CCCRRM Chile (QP No. 181);
• Sophia Bascunan Moraga, CCCRRM Chile (QP No. 518);
• Esteban Hormazabal Zuniga, CCCRRM Chile (QP No. 209) and FAusIMM;
• Patricio Martinez Fernandez, CCCRRM Chile (QP No. 395);
• Luis Bernal Venegas, CCCRRM Chile (QP No. 0415).

QP verification included a site visit to the project to inspect site geology, mineralized core, logging, density measurement and sampling procedures, and a review of the control sample results used to assess laboratory assay quality. In addition, the digitalization procedures of the exploration database and the validation process of historical drilling database results have been compared against original paper and digital records.

About Tintina Mines Ltd.

Tintina Mines is a Canadian-based company with over two decades of experience in the junior mining sector, focused on the acquisition, exploration and development of base and precious metal properties in South America and Canada.

Recently, Tintina expanded its portfolio with the addition of five new projects in Chile, following the acquisition of a majority stake in Andean Belt Resources. Tintina is committed to advancing the exploration and development of the copper-gold (Cu-Au) Domeyko Sulfuros project in the Atacama region of northern Chile.

Tintina Mines' common shares are listed on the TSX Venture Exchange under the symbol TTS.

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