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OGC.TO ·

Oceanagold Announces Publication of the Haile Supplementary Environmental Impact Statement

Permits & Approvals

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19 August 2022 News Release

OCEANAGOLD ANNOUNCES PUBLICATION OF THE HAILE

SUPPLEMENTARY ENVIRONMENTAL IMPACT STATEMENT

(BRISBANE) OceanaGold Corporation (TSX: OGC) ( ASX: OGC) (“OceanaGold” or the “Company”) is

pleased to announce that the United States Army Corp of Engineers (“ACOE”) has published the

Supplementary Environmental Impact Statement (“SEIS”) for the Haile Gold Mine (“Haile ”) located in

Kershaw, South Carolina.

The SEIS is now in a 30-day public comment period, after which there is a 15-day review period before the

final SEIS Record of Decision (“ROD”) is then scheduled to be issued. The Company is of the view that the

comment period and the review period are unl ikely to result in a change to the SEIS. The Company

anticipates the South Carolina Department of Health and Environmental Control and ACOE will issue the

associated permits shortly after the ROD is finalized and their permit process is complete.

The ROD and related permits are required to commence development of the Haile underground mine and

to expand the operating footprint to allow for additional potentially-acid-generating waste containment

facilities, overburden facilities and expanded tailings storage facility.

Gerard Bond, President and CEO of OceanaGold, stated “The publishing of the SEIS is an important step

towards finalizing this process and receiving the related operating permits that will allow commencement of

the development of the underground mine, increase Haile’s gold production and help unlock the full value of

Haile.”

Authorized for release to the market by Company Secretary, Liang Tang.

- ENDS -

For further information please contact:

Investor Relations:

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

Tel: +1 604 763 4438

[email protected]

Sabina Srubiski, Director, Investor Relations

Tel: +1 604-351-7909

[email protected]

Media Relations:

Anita Kharbanda, Acting Group Manager, Communications

Tel: +61 420 696 937

[email protected]

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www.oceanagold.com | Twitter: @OceanaGold

About OceanaGold

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

and social performance. For 30 years, we have been contributing 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 an industry -

leading pipeline of organic growth opportunities and a portfolio of es tablished operating assets including

Didipio Mine in the Philippines; Macraes and Waihi operations in New Zealand; and Haile Gold Mine in the

United States of America.

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 and 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. Although the

Company believes that any forward -looking statements and information contained in thi s 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.

NOT FOR DISSEMINATION OR DISTRIBUTION IN THE UNITED STATES AND NOT FOR

DISTRIBUTION TO US NEWSWIRE SERVICES.