MARIMACA COPPER CORP. — Director's Dealing 2025

Sep 23, 2025

Appendix 3Y Change of Director’s Interest Notice

Rule 3.19A.2

Appendix 3Y

Change of Director’s Interest Notice

Information or documents not available now must be given to ASX as soon as available. Information and documents given to ASX become ASX’s property and may be made public.

Introduced 30/09/01 Amended 01/01/11

Name of entity	Marimaca Copper Corp.
ARBN	683 017 094

We (the entity) give ASX the following information under listing rule 3.19A.2 and as agent for the director for the purposes of section 205G of the Corporations Act.

Name of Director	Timothy Petterson
Date of last notice	20 May 2025

Part 1 - Change of director’s relevant interests in securities

In the case of a trust, this includes interests in the trust made available by the responsible entity of the trust

Note: In the case of a company, interests which come within paragraph (i) of the definition of “notifiable interest of a director” should be disclosed in this part.

Direct or indirect interest	Direct
Nature of indirect interest(including registered holder)Note: Provide details of the circumstancesgivingrise to the relevant interest.
Date of change	17 September 2025 – 23 September 2025
No. of securities held prior tochange	20,597 ordinary shares182,691 unquoted restricted share units (RSUs)200,000 unquoted options exercisable at C$3.20 each on orbefore September 25, 2025280,000 unquoted options exercisable at C$5.00 each on orbefore May 6, 2026
Class	Unquoted options exercisable at C$3.20 each on or beforeSeptember 25, 2025Ordinary shares
Number acquired	200,000 ordinary shares
Number disposed	200,000 unquoted options exercisable at C$3.20 each on orbefore September 25, 2025200,000 ordinaryshares

• See chapter 19 for defined terms.

01/01/2011

Appendix 3Y Page 1

Appendix 3Y Change of Director’s Interest Notice

Value/ConsiderationNote: If consideration is non-cash, providedetails and estimated valuation	~A$700,618 (options exercise)~A$2,036,142 (share sale)
No. of securities held afterchange	20,597 ordinary shares182,691 RSUs280,000 unquoted options exercisable at C$5.00 each on orbefore May 6, 2026
Nature of changeExample:on-markettrade,off-markettrade,exerciseofoptions,issueofsecurities under dividend reinvestmentplan, participation in buy-back	Exercise of unquoted options into ordinary sharesSale of ordinary shares

Part 2 – Change of director’s interests in contracts

Note: In the case of a company, interests which come within paragraph (ii) of the definition of “notifiable interest of a director” should be disclosed in this part.

Detail of contract	N/A
Nature of interest	N/A
Name of registered holder(if issued securities)	N/A
Date of change	N/A
No. and class of securities to whichinterest related prior to changeNote: Details are only required for a contract inrelation to which the interest has changed	N/A
Interest acquired	N/A
Interest disposed	N/A
Value/ConsiderationNote: If consideration is non-cash, provide detailsand an estimated valuation	N/A
Interest after change	N/A

Part 3 –[+] Closed period

Part 3 –+Closed period
Were the interests in the securities or contracts detailedabove traded during a+closed period where prior writtenclearance was required?	No
If so, was prior written clearance provided to allow thetrade to proceed during this period?	N/A
If prior written clearance was provided, on what date wasthis provided?	N/A

• See chapter 19 for defined terms.

Appendix 3Y Page 2

01/01/2011