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Altiplano Metals Inc.

250 Southridge NW, Suite 300

Edmonton, AB

Canada

T6H 4M9

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Altiplano Receives Notifications on Legal Proceedings in Chile

EDMONTON AB, September 1, 2026 - Altiplano Metals Inc. (TSXV: APN) (WKN: A2JNFG) ("Altiplano" or the "Company") provides information related to 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.

Andes Metals SpA has received a bankruptcy notice from Andes Core Mining for claims of unpaid invoices totalling CLP$191,000,0000 (~CDN$284,000) for disputed mining contracting work. In addition, Altiplano Minerals Chile SpA has been presented a claim by Telecomunicaciones Robinson Alejandro Alvarez Vergara E.I.R.L. for CPL$70,000,00 (~CDN$104,000) for disputed electrical contracting services. In both situations, the initiation of the bankruptcy proceeding may be protested. Altiplano will contest these proceedings, which are expected to be presented to the Chilean courts this week.

The Company confirms that it intends to work with local stake holders and authorities to resolve the proceedings to prevent any further actions. The Company will provide an update expected later this week once more information is available following the court hearings

ON BEHALF OF THE BOARD

/s/ "John Williamson"

Chairman

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.