MARIMACA COPPER CORP. — Proxy Solicitation & Information Statement 2026

Jun 9, 2026

marimaca
COPPER CORP.
ARBN 683 017 094

Need assistance?

Phone:
1300 850 505 (within Australia)
+61 3 9415 4000 (outside Australia)

Online:
www.investorcentre.com/contact

YOUR VOTE IS IMPORTANT

For your vote to be effective it must be received by 10:00am (AWST) on Wednesday, 24 June 2026.

CDI Voting Instruction Form

How to Vote on Items of Business

Each CHESS Depositary Interest (CDI) is equivalent to one share of Company Common Stock, so that every 1 (one) CDI registered in your name at Monday, 25 May 2026 entitles you to one vote.

You can vote by completing, signing and returning your CDI Voting Instruction Form. This form gives your voting instructions to CHESS Depositary Nominees Pty Ltd, which will vote the underlying shares on your behalf. You need to return the form no later than the time and date shown above to give CHESS Depositary Nominees Pty Ltd enough time to tabulate all CHESS Depositary Interest votes and to vote on the underlying shares.

SIGNING INSTRUCTIONS FOR POSTAL FORMS

Individual: Where the holding is in one name, the securityholder must sign.

Joint Holding: Where the holding is in more than one name, all of the securityholders should sign.

Power of Attorney: If you have not already lodged the Power of Attorney with the Australian registry, please attach a certified photocopy of the Power of Attorney to this form when you return it.

Companies: Only duly authorised officer/s can sign on behalf of a company. Please sign in the boxes provided, which state the office held by the signatory, ie Sole Director, Sole Company Secretary or Director and Company Secretary. Delete titles as applicable.

Lodge your Form: XX

Online:

Lodge your vote online at
www.investorvote.com.au using your secure access information or use your mobile device to scan the personalised QR code.

Your secure access information is
| Control Number: 188838 |
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By Mail:

Computershare Investor Services Pty Limited
GPO Box 242
Melbourne VIC 3001
Australia

By Fax:

1800 783 447 within Australia or
+61 3 9473 2555 outside Australia

PLEASE NOTE: For security reasons it is important that you keep your SRN/HIN confidential.

You may elect to receive meeting-related documents, or request a particular one, in electronic or physical form and may elect not to receive annual reports. To do so, contact Computershare.

Samples/000001/000002512

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Change of address. If incorrect, mark this box and make the correction in the space to the left. Securityholders sponsored by a broker (reference number commences with 'X') should advise your broker of any changes.

CDI Voting Instruction Form

Please mark ☐ to indicate your directions

Step 1

CHESS Depositary Nominees Pty Ltd will vote as directed

XX

Voting Instructions to CHESS Depositary Nominees Pty Ltd

I/We being a holder of CHESS Depositary Interests of Marimaca Copper Corp. hereby direct CHESS Depositary Nominees Pty Ltd to vote the shares underlying my/our holding at the Annual General and Special Meeting of shareholders of Marimaca Copper Corp. to be held online at https://meetnow.global/MY9TM7Y on Tuesday, 30 June, 2026 at 10:00am (local time in Vancouver, British Columbia) (Wednesday, 1 July 2026 at 1:00am (AWST)) and at any adjournment or postponement of that meeting.

By execution of this CDI Voting Form the undersigned hereby authorises CHESS Depositary Nominees Pty Ltd to appoint such proxies or their substitutes to vote in their discretion on such business as may properly come before the meeting.

Step 2

Items of Business

PLEASE NOTE: If you mark the Withhold box for an item, you are directing CHESS Depositary Nominees Pty Ltd or their appointed proxy not to vote on your behalf on a show of hands or a poll and your votes will not be counted in computing the required majority.

VOTING RECOMMENDATIONS ARE INDICATED BY HIGHLIGHTED TEXT OVER THE BOXES.

1. Number of Directors

To set the number of Directors at six (6).

For Against

☐ ☐

1. Election of Directors

2. Hayden Locke

For Withhold

1. Michael Haworth

For Withhold

1. Tim Petterson

For Withhold

1. Giancarlo Bruno

Lagomarsino

1. Zenon Wozniak

2. Kieran Daly

For Withhold

☐ ☐

1. Appointment of Auditors

Appointment of PricewaterhouseCoopers LLP, Chartered Professional Accountants as Auditors of the Company for the ensuing year and authorizing the Directors to fix their remuneration.

For Withhold

☐ ☐

1. Re-Approval of Omnibus Incentive Plan

To re-approve the Company's omnibus incentive plan and any unallocated stock options and restricted share units issuable pursuant thereto.

For Withhold

☐ ☐

Step 3

Signature of Securityholder(s)

This section must be completed.

Individual or Securityholder 1

Securityholder 2

Securityholder 3

Sole Director & Sole Company Secretary

Director

Director/Company Secretary

Date

Update your communication details (Optional)

Mobile Number

Email Address

By providing your email address, you consent to receive future Notice of Meeting & Proxy communications electronically

MC2

Computershare

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