Ms. Emily Moss reports

CORRECTION: MARIMACA COMMENCES TRADING ON THE AUSTRALIAN SECURITIES EXCHANGE

Marimaca Copper Corp. has referred to its announcement dated March 31, 2025 (ET)/April 1, 2025 (AEDT), in relation to the commencement of trading on the Australian Securities Exchange (ASX). The company advises that the announcement contained an error and Marimaca is not admitted to the ASX as a foreign-exempt listing.

The company was admitted to the official list of the ASX on March 31, 2025 (AEDT), and commenced quotation at 1 p.m. (AEDT) on April 2, 2025. Shares of the company trade under the ticket MC2 and will be settled in the form of chess depositary interests (CDIs). Each CDI will be equivalent to one fully paid common share of the company.

About Marimaca Copper Corp.

Marimaca is a copper exploration and development company focused on its 100-per-cent-owned flagship Marimaca copper project and surrounding exploration properties located in Antofagasta region, Chile.

The Marimaca copper project hosts the Marimaca oxide deposit (the MOD), an iron-oxide-copper-gold-type copper deposit. The company is currently progressing the Marimaca copper project through the definitive feasibility study led by Ausenco Chile Ltda. In parallel, the company is exploring its extensive land package in the Antofagasta region, including the greater than 15,000-hectare wholly owned Sierra de Medina property block, located 25 kilometres from the MOD.

We seek Safe Harbor.