Mr. Juan Enrique Rassmuss reports

TINTINA MINES CLOSES C$91 MILLION SUBSCRIPTION RECEIPT FINANCING TO ADVANCE DOMEYKO SULFUROS TRANSACTION WITH STRATEGIC INVESTMENT FROM THE GIGNAC FAMILY, SUMITOMO CORPORATION AND FRANCO-NEVADA

Tintina Mines Ltd. has closed its non-brokered private placement of subscription receipts for aggregate gross proceeds of approximately $91-million, at a price of 68 cents per subscription receipt, as previously described in the company's news releases dated June 2, 2026, and July 2, 2026. The subscription receipts were issued on July 9, 2026, and the gross proceeds of the offering are being held in escrow pending satisfaction of the escrow release conditions (as defined below).

The offering was anchored by a newly formed investment vehicle financed equally by Sumitomo Corp., a leading Fortune Global 500 integrated trading and business investment company headquartered in Tokyo, Japan, and the Gignac family, founder of G Mining Services Inc., a Canadian mining development company with an established record of project delivery. The offering also included cornerstone participation from Franco-Nevada Corp., a leading gold-focused royalty and streaming company, and a broader group of strategic, institutional and other investors assembled by G Mining Capital Inc., a Canadian mining investment platform whose principal shareholders are the Gignac family and Sumitomo. The offering included participation from a broad investor base, including strategic and institutional investors, retail investors, and global asset managers. Canaccord Genuity Corp. acted as finder in connection with approximately $17-million of subscription receipts issued under the offering, in consideration for which it received a 5-per-cent cash finder's fee from the company.

Upon satisfaction of the escrow release conditions, net proceeds of the offering are expected to be used to advance the Domeyko Sulfuros copper-gold project toward a final investment decision, including preliminary economic assessment optimization, infill and exploration drilling, environmental baseline studies, permitting, community engagement, and the preparation of a definitive feasibility study, and to finance the acquisition of the remaining 26.25-per-cent minority interest in Tintina's Chilean operating subsidiary, Andean Belt Resources SpA, for aggregate cash consideration of $26.25-million (U.S.).

The principal conditions for the release of the proceeds of the offering to the company and the simultaneous exchange of the subscription receipts for their underlying securities of the company are the completion of the minority acquisition (subject only to the payment of the purchase price owing thereunder), the receipt of all requisite regulatory and the receipt of all requisite shareholder approvals. An annual general and special meeting of the shareholders of Tintina has been scheduled for Aug. 21, 2026, to seek the shareholder approvals.

The subscription receipts, the securities issuable upon exchange thereof and the common shares (as defined below) issuable upon exercise of the warrants are subject to applicable resale restrictions, including a hold period of four months and one day from the closing of the offering under Canadian securities rules.

Management commentary

Juan Enrique Rassmuss, chairman and chief executive officer of Tintina, stated: "This is an important step for Tintina and for Domeyko Sulfuros. The project has the scale, location and geological potential to become a meaningful copper-gold development opportunity, and this financing brings in the partners and capital required to move it into its next phase. We believe this transaction provides a clear path to consolidate ownership of the project and advance Domeyko Sulfuros toward FID."

Claude Dufresne, chief executive officer of GMC, stated: "The successful closing of this financing is a defining milestone for G Mining Capital and a strong foundation for the development of Domeyko Sulfuros. The project is exactly the type of high-quality copper opportunity GMC was established to pursue, and we look forward to working with Tintina, Sumitomo, the Gignac family and the broader investor group to advance it toward FID."

Early warning reporting disclosure

Immediately prior to the closing of the offering, the anchor investor did not beneficially own or control any securities of the company.

Immediately following the closing of the offering, the anchor investor beneficially owns and controls 71.03 million subscription receipts. Because the subscription receipts do not carry voting rights prior to their exchange, the anchor investor's current securityholding percentage of the outstanding common shares of the company is 0 per cent.

The particulars of the offering are described above.

Assuming the satisfaction of the escrow release conditions and the simultaneous exchange of the subscription receipts, the anchor investor would beneficially own and control 71.03 million common shares and 71.03 million common share purchase warrants composed of 35,515,000 first warrants exercisable at 80 cents per common share for a period of three years, and 35,515,000 second warrants exercisable at $1 per common share for a period of five years, representing approximately 25 per cent of the issued and outstanding common shares on a non-diluted basis, and approximately 38 per cent of the issued and outstanding common shares on a partially diluted basis (assuming the exercise of all warrants held by the anchor investor).

In accordance with applicable securities laws, the anchor investor may, from time to time and at any time, acquire additional common shares and/or other equity, debt, or other securities or instruments of the company in the open market or otherwise, and the anchor investor reserves the right to dispose of any or all of their securities in the open market or otherwise at any time and from time to time, and to engage in similar transactions with respect to the securities, the whole depending on market conditions, the business and prospects of the company, and other relevant factors.

An early warning report containing additional information with respect to the foregoing matters will be filed under the company's SEDAR+ profile and may also be obtained by contacting: Claude Dufresne care of G Mining Capital Inc., 1010, 5025 Lapiniere Blvd., Brossard, Que., J4Z 0N5, 450-465-1950 or inbound@gminingcapital.com.

About Tintina Mines Ltd.

Tintina 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 through ABR, its currently 73.75-per-cent-owned Chilean subsidiary.

We seek Safe Harbor.