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Marimaca Announces Changes to Board and Senior Management Team

Management Changes

News Release

Marimaca Announces Changes to Board and Senior Management Team

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

 Mr. 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

 Ms. Petra Decher to assume the role of Chief Financial Officer and step down from the Board of Directors

 Mr. 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

 Mr. 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.