Marimaca Announces Receipt of Environmental Approval for the Marimaca Oxide Deposit

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VANCOUVER, British Columbia, Nov. 11, 2025 (GLOBE NEWSWIRE) — Marimaca Copper Corp. (“Marimaca Copper” or the “Company”) (TSX:MARI, ASX:MC2) is pleased to announce that its Chilean subsidiary, Marimaca NewCo Limitada (“Marimaca”), has received the formal Resolución de Calificación Ambiental (“RCA”) for its Marimaca Oxide Project (the “MOD” or “Project”), located in the low coastal cordillera of the Antofagasta region of Chile. The RCA represents the formal approval of the Company’s Declaración de Impacto Ambiental (Environmental Impact Statement) (“DIA”) submission made in December 2024 and marks another strategic step closer to being construction-ready at the MOD.

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The RCA has been issued following a rigorous preparation and engagement process, including multiple years of baseline environmental studies, social and archaeological information collection, multiple voluntary stakeholder engagement programs and various technical and project engineering studies.

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The receipt of the RCA allows Marimaca to advance the next phase of permitting activities for the Project, known as the Sectorial Permits, which are auxiliary permits required for various stages of construction and operation. The Company is already well advanced in its planning for this phase, laying the groundwork for its master execution schedule and positioning the Project to be construction ready in the second half of 2026.

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Jose Antonio Merino, Managing Director, Chile and CFO of Marimaca Copper, commented:

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“Developing our assets in Chile to the highest possible environmental and social standards is a core objective of Marimaca. We committed significant time and resources to our permitting strategy, to design a project which delivers a strong mitigation strategy for the environmental and social risks identified, a framework for ongoing risk management, while aligning with our corporate ethos to deliver a project which generates long term value for all of our stakeholders. The receipt of the RCA reflects the exceptional work completed, over several years, by our team.

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“I would also like to thank our local, regional, and governmental stakeholders for their efficient engagement during the intensive review process, since our formal submission in December 2024. We look forward to a positive ongoing working relationship as we commence the next phase of permitting workstreams required to begin full construction and support our future operations.”

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Hayden Locke, President & CEO of Marimaca Copper, commented:

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“On behalf of our board and shareholders, I would like to extend our thanks and congratulations to our Chilean team for the significant milestone Marimaca has achieved. They have been the architects and executors of our permitting strategy, which is the culmination of several years of planning and preparation. It has been a challenging week for the Company with the sudden loss of Colin Kinley, a steadfast supporter of the team’s permitting strategy, and we are proud to achieve this milestone as a reflection of his commitment to Marimaca’s success.

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“Our team is immensely proud of the Company we are building and holds themselves to high standards when it comes to the responsible development of our projects and our burgeoning reputation as a highly credible custodian for these assets.