MARIMACA COPPER CORP. — Capital/Financing Update 2025

Sep 11, 2025

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News Release

Shares issued under the Placement Notice under section 708A(5)(e) of the Corporations Act

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This notice is given by Marimaca Copper Corp. ( TSX: MARI ) ( ASX: MC2 ) (“ Marimaca ” or the “ Company ”) under section 708A(5)(e) of the Corporations Act 2001 (Cth) ( Corporations Act ).

The Company issued 8,247,423 CHESS Depositary Interests ( CDIs ) at an issue price of A$9.70 per CDI to institutional, sophisticated and existing investors under the placement on 12 September 2025.

The Company advises that:

1. the CDIs were issued without disclosure to investors under Part 6D.2 of the Corporations Act;

2. this notice is being given under section 708A(5)(e) of the Corporations Act;

3. as a disclosing entity, the Company is subject to regular reporting and disclosure obligations;

4. as at the date of this notice, the Company has complied with:

   • a. the provisions of Chapter 2M of the Corporations Act as they apply to the Issuer; and

   • b. sections 674 and 674A of the Corporations Act; and

5. as at the date of this notice, there is no information that is "excluded information" within the meanings of sections 708A(7) and 708A(8) of the Corporations Act.

This news release is authorized for release by the Board of Directors of Marimaca.

Contact Information

For further information please visit www.marimaca.com or contact:

Tavistock

+44 (0) 207 920 3150 Emily Moss / Ruairi Millar

marimaca@tavistock.co.uk

None of the TSX, ASX or the Canadian Investment Regulatory Organization accepts responsibility for the adequacy or accuracy of this release.