OceanaGold Corporation — Proxy Solicitation & Information Statement 2023

Mar 22, 2023

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March 22, 2023

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

To: All Canadian Securities Regulatory Authorities

Subject: OCEANAGOLD CORPORATION

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 and Special Meeting Record Date for Notice of Meeting : May 01, 2023 Record Date for Voting (if applicable) : May 01, 2023 Beneficial Ownership Determination Date : May 01, 2023 Meeting Date : June 15, 2023 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 Yes Beneficial Holders Stratification Criteria: Not Applicable NAA for Registered Holders Yes Registered Holders Stratification Criteria: Not Applicable

Voting Security Details:

Description CUSIP Number ISIN COMMON SHARES 675222103 CA6752221037 COMMON 144A LEGEND 675222202 US6752222025

Sincerely,

Computershare

Agent for OCEANAGOLD CORPORATION