Marimaca Copper Corporation — AGM Information 2021

Mar 26, 2021

March 26, 2021

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510 Burrard St, 3rd Floor Vancouver BC, V6C 3B9 www.computershare.com

To: All Canadian Securities Regulatory Authorities

Subject: MARIMACA COPPER CORP.

Dear Sir/Madam:

We advise of the following with respect to the upcoming Meeting of Security Holders for the subject Issuer:

Meeting Type : Annual General Meeting Record Date for Notice of Meeting : April 20, 2021 Record Date for Voting (if applicable) : April 20, 2021 Beneficial Ownership Determination Date : April 20, 2021 Meeting Date : May 27, 2021 Meeting Location (if available) : Virtual Meeting Issuer sending proxy related materials directly to NOBO: Yes Issuer paying for delivery to OBO: Yes

Notice and Access (NAA) Requirements:

NAA for Beneficial Holders No NAA for Registered Holders No

Voting Security Details:

Description CUSIP Number ISIN COMMON 56783M106 CA56783M1068

Sincerely,

Computershare

Agent for MARIMACA COPPER CORP.