Mr. Juan Enrique Rassmuss reports

UPDATE TO TINTINA MINES PREVIOUS ANNOUNCEMENT ON JUNE 2, 2026 OF A C$91 MILLION PRIVATE PLACEMENT AND STRATEGIC PARTNERSHIP WITH THE GIGNAC FAMILY AND SUMITOMO CORPORATION FOR THE DEVELOPMENT OF THE DOMEYKO SULFUROS COPPER-GOLD PROJECT IN CHILE

Tintina Mines Ltd. previously issued a news release on June 2, 2026, announcing an offering of subscription receipts for aggregate gross proceeds of approximately $91-million, at a price of 68 cents per subscription receipt, in connection with a strategic partnership to be entered into with the Gignac family and Sumitomo Corp. for the development of the Domeyko Sulfuros copper-gold project in Chile and the consolidation of its ownership in the project through the acquisition of the indirect minority interests held by various third parties.

By way of update, Tintina further announces that the definitive agreement for the acquisition of the minority interests is being finalized and anticipates it shall be signed by the closing of the offering, which is scheduled to occur on July 9, 2026.

In addition, an annual general and special meeting of the shareholders of Tintina has been scheduled for Aug. 21, 2026, in order to seek the shareholder approvals required to permit the company to complete the offering and the acquisition of the minority interest, as well as to attend to the general proceedings of an annual general shareholders meeting. Additional details regarding each of these matters, as well as the rationale for the board's recommendations that shareholders vote in favour of each such approval, will be set out in the management proxy circular to be mailed to the shareholders of Tintina and made available under Tintina's SEDAR+ profile.

About Tintina Mines Ltd.

Tintina Mines is a TSX Venture Exchange-listed mineral exploration and development company focused on advancing the Domeyko Sulfuros copper-gold project in the Atacama region of Chile.

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