Marimaca Copper Corporation — Proxy Solicitation & Information Statement 2025

May 7, 2025

MARIMACA COPPER CORP.
Suite 2200, 855 West Georgia St
Vancouver, V6C 3E8
British Columbia

NOTICE OF ANNUAL GENERAL MEETING OF SHAREHOLDERS

NOTICE IS HEREBY GIVEN that an annual general meeting (the "Meeting") of the shareholders of Marimaca Copper Corp. (the "Company") will be held virtually via webcast at https://meetnow.global/MPXA6JD on Thursday, June 5, 2025 at 10:00 a.m. (local time in Vancouver, British Columbia) for the following purposes:

1. for the shareholders to receive the financial statements of the Company for the year ended December 31, 2024, together with the auditor's report thereon;
2. to set the number of directors at eight;
3. to elect directors of the Company for the ensuing year;
4. to appoint PricewaterhouseCoopers LLP, Chartered Professional Accountants, as auditors of the Company for the ensuing year and to authorize the directors to determine the remuneration to be paid to the auditors; and
5. to transact such other business as may properly be put before the Meeting.

If you are a registered shareholder of the Company and are unable to attend the Meeting via webcast, please read, sign and date the form of proxy for the Meeting (the "Proxy") and deposit it with Computershare Investor Services Inc. ("Computershare") by courier or mail at 100 University Avenue, 8th Floor, Toronto, Ontario, M5J 2Y1, Attention: Proxy Department, or by facsimile at 1-866-249-7775 (toll-free in North America) or 1-416-263-9524 (international) by 10:00 a.m. (local time in Vancouver, British Columbia) on Tuesday, June 3, 2025 or at least 48 hours (excluding Saturdays, Sundays and holidays) before any postponement or adjournment of the Meeting, otherwise you will not be entitled to vote at the Meeting by proxy. Alternatively, registered shareholders may vote by telephone (1-866-732-8683) or online (www.investorvote.com) using the control number listed on the Proxy. Only shareholders of record at the close of business on Tuesday, April 29, 2025, will be entitled to vote at the Meeting. An information circular and a form of Proxy accompany this notice.

If you are a non-registered shareholder of the Company, please complete and return the voting instruction form (or other accompanying form) in accordance with the instructions for completion and deposit.

All shareholders may attend the Meeting via webcast but must follow the instructions set out in the accompanying information circular if they wish to vote at the Meeting.

DATED at Vancouver, British Columbia, the 29th day of April 2025.

ON BEHALF OF MARIMACA COPPER CORP.

(signed) "Hayden Locke"

Hayden Locke,

President & Chief Executive Officer