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OceanaGold Receives SEIS Record of Decision and Mine Operating Permit for Haile Gold Mine Expansion First ore from the Haile underground on-track for the fourth quarter of 2023 (VANCOUVER B.C.)

Mine Development & Operations Permits & Approvals

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19 DECEMBER 2022 News Release

OceanaGold Receives SEIS Record of Decision and Mine Operating

Permit for Haile Gold Mine Expansion

First ore from the Haile underground on-track for the fourth quarter of 2023

(VANCOUVER B.C.) OceanaGold Corporation (TSX: OGC) (“OceanaGold” or the “Company”) is pleased to

announce that the United States Army Corp s of Engineers (“ ACOE”) has issued the Supplementary

Environmental Impact Statement Record of Decision (“SEIS ROD”) for the expansion of the Haile Gold Mine

(“Haile”) located in Kershaw, South Carolina.

In addition, the South Carolina Department of Health and Environmental Control (“DHEC”) issued the Mine

Operating Permit (“MOP”) on December 14, 2022, which, following a statutory 15-day period, will become

final and will complete the state permitting process for the Haile expansion.

OceanaGold President and CEO, Gerard Bond, said “The receipt of the Haile SEIS ROD and the MOP

represents a significant milestone for OceanaGold, putting the Company on a clear path to deliver increased

gold production and lower unit costs at this cornerstone asset. We are thrilled to be progressing the next

stage of Haile’s growth as we expand our operations underground and , with exploration success, pursue

further opportunities to profitably extend the mine life.”

The receipt of the SEIS ROD and t he MOP allows for development and operation of the underground mine

and an expansion of the operating footprint to allow for additional waste containment facilities and expanded

tailings storage capacity.

With the early works program approved in the third quarter, underground development of the main production

decline and exhaust ventilation portals is safely progressing in -line with plan. First ore from the Haile

underground remains on-track for delivery in the fourth quarter of 2023.

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Photo 1: Entrance to the main underground production decline at the Haile Gold Mine.

Photo 2: Start of the exhaust ventilation portal at the Haile Gold Mine.

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About OceanaGold

OceanaGold is a multinational gold producer committed to the highest standards of technical, environmental

and social performance. We are committed to excellence in our industry by delivering sustainable

environmental and social outcomes for our communities, and strong returns for our shareholders. Our global

exploration, development, and operating experience has created a strong pipeline of organic growth

opportunities and a portfolio of established operating assets including the Haile Gold Mine in the United

States of America, Didipio Mine in the Philippines, and the Macraes and Waihi operations in New Zealand.

For further information please contact:

Investor Relations:

Brian Martin, Senior Vice President, Business Development & Investor Relations

Tel: +1 604 678-4096

[email protected]

Sabina Srubiski, Director, Investor Relations

Tel: +1 604-678-4095

[email protected]

Media Relations:

Anita Kharbanda, Acting Group Manager, Communications

Tel: +61 420 696 937

[email protected]

www.oceanagold.com | Twitter: @OceanaGold

Cautionary Statement for Public Release

Certain information contained in this public release may be deemed “forward-looking” within the meaning of

applicable securities laws. Forward -looking statements and information relate to future performance and

reflect the Company’s expectations regarding the generation of free cash flow, execution of business

strategy, future growth, future production, estimated costs, results of operations, business prospects and

opportunities of OceanaGold Corporation and its related subsidiaries. Any statements that express or involve

discussions with respect to predictions, expectations, beliefs, plans, projections, objectives, assumptions or

future events or performance (often, but not always, using words or phrases such as "expects" or "does not

expect", "is expected", "anticipates" or "does not anticipate", "plans", "estimates" or "intends", or stating that

certain actions, events or results "may", "could", "would", "might" or "will" be taken, occur or be achieved)

are not statements of historical fact and may be forward -looking statements. Forward -looking statements

are subject to a variety of risks an d uncertainties which could cause actual events or results to differ

materially from those expressed in the forward -looking statements and information. They include, among

others, the accuracy of mineral reserve and resource estimates and related assumptions, inherent operating

risks and those risk factors identified in the Company’s most recent Annual Information Form prepared and

filed with securities regulators which is available on SEDAR at www.sedar.com under the Company’s name.

There are no assurances the Company can fulfil forward-looking statements and information. Such forward-

looking statements and information are only predictions based on current information available to

management as of the date that such predictions are made; actual events or results may differ materially as

a result of risks facing the Company, some of which are beyond the Company's control.

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Although the Company believes that any forward-looking statements and information contained in this press

release is based on reasonable assumptions, readers cannot be assured that actual outcomes or results will

be consistent with such statements. Accordingly, readers should not place undue reliance on forward-looking

statements and information. The Company expressly disclaims any intention or obligation to update or revise

any forward-looking statements and information, whether as a result of new information, events or otherwise,

except as required by applicable securities laws. The information contained in this release is not investment

or financial product advice.

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DISTRIBUTION TO US NEWSWIRE SERVICES.