EDMONTON AB, October 7, 2026  – Altiplano Metals Inc. (TSXV: APN) (WKN: A2JNFG) (“ Altiplano ” or the “ Company ”) announces that, further to its news release dated October 4, 2026, it has set November 23, 2026 as the date for the annual and special meeting of shareholders (the “ Meeting ”) to, among other things, approve the sale of its El Peñón Mill and related land and permits located in Chile for a purchase price of US$1,540,000 to Tersus Tierras SpA (the “ Transaction ”). The record date for shareholders of the Company entitled to vote at the Meeting has been set as October 20, 2026. The Company’s management information circular and related Meeting materials will be sent to Company shareholders and available on the Company’s profile at www.sedarplus.ca in the coming weeks.

The Transaction is subject to approval of the TSX Venture Exchange and approval of the Company’s shareholders (the “ Shareholder Approval ”), which may be obtained by either: (i) a majority of the votes cast at the Meeting; or (ii) receipt of the written consent to the Transaction from at least 50% of the Company’s shareholders. In parallel to the Meeting, the Company will seek Shareholder Approval of the Transaction by written consent as permitted by TSXV policy. If Shareholder Approval of the Transaction is received by written consent, approval of the Transaction will not proceed at the Meeting. The board of directors of the Company have approved the Purchase Agreement and unanimously recommend that the Company’s shareholders vote in favour of the Transaction .

The Company also announces that it has filed its annual financial statements for the year ended March 31, 2026, management’s discussion and analysis, and the related CEO and CFO certifications. The Company expects to file its interim quarterly financial statements for the three-month period ended June 30, 2026 on or before October 9, 2026.

ON BEHALF OF THE BOARD

/s/ “Alastair McIntyre”
President, CEO and Director

For further information, please contact:

Alastair McIntyre, CEO
moc.slatemnpa@mriatsala
Tel: (416) 434 3799

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.

Forward-Looking Information: This news release contains forward-looking information within the meaning of applicable Canadian securities laws, including statements regarding the Transaction and conditions to completion, receipt of TSXV approval, receipt of shareholder approval, timing of the Meeting, timing of shareholder approval of the Transaction and the filing of its interim quarterly financial statements. Forward-looking information is based on assumptions and is subject to known and unknown risks and uncertainties that could cause actual results to differ materially from those expressed or implied. Readers are cautioned not to place undue reliance on forward-looking information. The Company undertakes no obligation to update or revise such information except as required by applicable securities laws.