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Altiplano Metals Inc.

250 Southridge NW, Suite 300

Edmonton, AB

Canada

T6H 4M9

47415910v1

Altiplano Provides Update on Legal Proceedings in Chile

EDMONTON AB, September 8th, 2026 - Altiplano Metals Inc. (TSXV: APN) (WKN: A2JNFG) ("Altiplano" or the "Company") provides an update on the legal actions initiated against two of the Company's wholly owned Chilean subsidiaries, Andes Metals SpA and Altiplano Minerals SpA. The Company and the Company's other subsidiaries are not subject to these initiated proceedings.

Altiplano confirms that the case was presented to the courts and during this time the actions were contested but no decisions were made. There will be an evidentiary hearing for each of these cases later this week where the company will have further opportunity to present their opposition. After these hearings have concluded, there will be additional hearings to be held within the following weeks in which the courts shall rule on the admissibility of the actions.

The Company confirms that is working with local stake holders and authorities to resolve the proceedings to prevent any further actions. The Company will provide an update once more information is available.

ON BEHALF OF THE BOARD

/s/ "Alastair McIntyre"

President, CEO and Director

For further information, please contact:

Alastair McIntyre, CEO

alastairm@apnmetals.com

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 proceedings in respect of certain of the Company's subsidiaries in Chile and, the timing and potential outcome of these court proceedings and related matters. 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.