Vancouver, British Columbia, April 26, 2021 – Marimaca Copper Corp. (“Marimaca Copper” or the “Company”) (TSX: MARI) is pleased to announce several changes to the structure of its board and senior management team as it positions itself for the transition from explorer to developer and, eventually, copper producer.

Highlights

• Mike Haworth transitions from Executive to Non-Executive Chair
• Current President, Mr. Hayden Locke, to assume the role of Chief Executive Officer and join the Board of Directors
• Petra Decher to assume the role of Chief Financial Officer and step down from the Board of Directors
• Colin Kinley to succeed Ms. Decher as Lead Independent Director and Chair of the Audit Committee
• Creation of the role of Chief Operating Officer, to be assumed by Mr. Luis Tondo
• Appointment of Ms. Laura Rich as General Counsel and Corporate Secretary
• Clive Newall appointed as a member of the Audit Committee and Compensation & ESG Committee
• Final assay results from Marimaca Sulphide Target drilling expected to be received at the end of April

Mike Haworth, Chair of the Board of Directors of Marimaca Copper, commented:

“As we move forward with the development of the Marimaca Oxide Deposit (“MOD”), we are entering an exciting but often challenging transition phase in any junior mining company’s development. These difficulties are exacerbated by the restrictions on travel caused by the pandemic, which has limited the ability of our team to travel to and from Chile.

“There will be an increasing focus on corporate development and finance outside of Chile as these aspects become more critical in the lead up to financing the MOD. The role of our Chile-based executive team also becomes even more important in building our base management processes, expanding our technical team and setting the culture for our future operations.

“Hayden, Petra and Laura are all experienced mining executives with deep capital markets and corporate experience and have been part of management teams navigating this transition several times. Their financial and corporate skill sets are complemented by Luis’s, an experienced project executor and mine operator, who will transition to a role that will allow him to focus on the execution of our development strategy and the critical day-to-day management of our Chilean operations.

“Marimaca is a unique project, and we are committed to its progression towards development and ultimately production. In parallel, we are continuing our exploration efforts to grow our current mineral resource inventory and we continue to be extremely excited by the results we see in the various exploration programs underway. The assays for the last holes at the Marimaca Sulphide Target are expected towards the end of this week.

“We would like to thank Luis for his contribution and leadership over the last four years, during which we have drilled out the MOD to a significant mineral resource and delivered a compelling PEA which indicated it has fantastic potential once in operation. 2021 and 2022 will be pivotal years for Marimaca Copper and the changes we have made to our executive team strengthen our transition beyond explorer and developer to our eventual goal of producing copper.”

 General Operational Update

The Company continues to make progress with the various technical workstreams associated with the MOD including the Phase 5 metallurgical test work program, geohydrology and hydrology, geotechnical studies, and investigations and engagement on power and water. In addition, it continues to complete various surface exploration programs including geochemical sampling and mapping across its large land package. Finally, the Company will imminently commence a detailed option trade-off study, which will assist the Company to define the basis of design that will be taken into the Feasibility Study, which is expected to commence in the second half of 2021.

Marimaca Copper continues to monitor the situation with respect to COVID-19 in Chile and has implemented systems and processes to ensure the safety of its people and assets during this challenging period. The Company continues to make good progress on the various technical workstreams it had planned for 2021 and does not expect any material delays to its development timelines at this stage.

Contact Information

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

Tavistock

+44 (0) 207 920 3150

Jos Simson/Emily Moss

[email protected]

Forward Looking Statements

This news release includes certain “forward-looking statements” under applicable Canadian securities legislation. There can be no assurance that such statements will prove to be accurate, and actual results and future events could differ materially from those anticipated in such statements. Forward-looking statements reflect the beliefs, opinions and projections on the date the statements are made and are based upon a number of assumptions and estimates that, while considered reasonable by Marimaca Copper, are inherently subject to significant business, economic, competitive, political and social uncertainties and contingencies. Many factors, both known and unknown, could cause actual results, performance or achievements to be materially different from the results, performance or achievements that are or may be expressed or implied by such forward-looking statements and the parties have made assumptions and estimates based on or related to many of these factors. Such factors include, without limitation: risks related to share price and market conditions, the inherent risks involved in the mining, exploration and development of mineral properties, the uncertainties involved in interpreting drilling results and other geological data, fluctuating metal prices, the possibility of project delays or cost overruns or unanticipated excessive operating costs and expenses, uncertainties related to the necessity of financing, the availability of and costs of financing needed in the future as well as those factors disclosed in the annual information form of the Company dated March 29, 2021, the final short form base prospectus and other filings made by the Company with the Canadian securities regulatory authorities (which may be viewed at www.sedar.com). Accordingly, readers should not place undue reliance on forward-looking statements. Marimaca Copper undertakes no obligation to update publicly or otherwise revise any forward-looking statements contained herein whether as a result of new information or future events or otherwise, except as may be required by law.

Neither the Toronto Stock Exchange nor the Investment Industry Regulatory Organization of Canada accepts responsibility for the adequacy or accuracy of this release.