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OceanaGold Files Annual Information Form and Technical Reports for Haile and Macraes

Technical Reports (NI 43-101) Financials

March 28, 2024

News Release

OceanaGold Files Annual Information Form and Technical Reports for

Haile and Macraes

(VANCOUVER) OceanaGold Corporation (TSX:OGC, OTCQX:OCANF) (“OceanaGold” or the “Company”)

is pleased to announce the filing of its Annual Information For m, along with updated t echnical reports

prepared in accordance with National Instrument 43-101 – Standards of Disclosure for Mineral Projects (“NI

43-101") for both Haile and Macraes , each with an effective date of December 31, 2023. The documents

are available under the Company’s profile on SEDAR+ at www.s edarplus.com and on our website at

www.oceanagold.com.

Gerard Bond, President and Chief Executive Officer of OceanaGold, said “The updated Haile technical

report outlines the robust growth profile we see at Haile. Reserves now include both the Horseshoe and

Palomino underground mines which, in conjunction with the expected grade profile from the open pits, is

projected to grow gold production in 2026 to 315koz at an All in Sustaining Cost (“AISC”) of approximately

$1,000 per ounce. On a Mineral Reserve-only life of mine basis, Haile is expected to produce 2.3 Moz of

gold over a 12- year mine life at average gold production of 192 koz per year with a life of mine average

AISC of $1,200 per ounce.

We also see opportunities to further improve the economics of Haile from that shown in the technical report,

including the potential to mine Ledbetter Phase 4 as an underground rather than an open pi t as currently

contemplated. This, in addition to exploration upside at Horseshoe, Horseshoe Extensions and regionally,

are focus areas for our technical work and drill programs in 2024.

At Macraes, the updated t echnical report includes the removal of Round Hill O pen Pit from Mineral

Reserves, primarily due to the technical risks of open pit mining adjacent to an existing tailings facility. The

current Mineral Reserves, which a re based on a conservative $1,500/oz gold price assumption, are

expected to generate strong Free Cash Flow over the next four years. With today’s gold prices materially

higher than the reserve price assumption in the technical report, we see the potential to extend Macraes'

mine life beyond the Mineral Reserve only case whilst still producing strong economic returns, and our team

is focused on defining this potential in 2024”.

OceanaGold has filed the updated technical reports for Haile and Macraes in accordance with NI 43- 101.

Such t echnical reports are available under our profile on SEDAR+ at www.sedarplus.com and on our

website at www.oceanagold.com.

About OceanaGold

OceanaGold is a growing intermediate gold and copper producer committed to safely and responsibly

maximizing the generation of Free Cash Flow from our operations and delivering strong returns for our

shareholders. We have a portfolio of four operating mines: the Haile Gold Mine in the United States of

America; Didipio Mine in the Philippines; and the Macraes and Waihi operations in New Zeal and.

For further information please contact:

Investor Relations:

Rebecca Harris, Director, Investor Relations

Tel: +1 604 678 4095

[email protected]

Media Relations:

Louise Burgess, Director, Communications

Tel: 1 (604) 403-2019

[email protected]

Qualified Persons

Mr. David Londoño, Executive Vice President, Chief Operating Officer Americas, a qualified person under

NI 43-101, has reviewed and approved the disclosure of all scientific and technical information related to

Haile contained in this news release. Mr. Peter Sharpe, Executive Vice President, Chief Operating Officer

Asia-Pacific, a qualified person under NI 43-101, has reviewed and approved the disclosure of all scientific

and technical information related to Macraes contained in this news release.

Technical Reports

For further information, please refer to the following NI 43- 101 technical reports available on the SEDAR+

website at www.sedarplus.com under the Company's profile or on our website at www.oceanagold.com.

a) "NI 43-101 Technical Report Haile Gold Mine Lancaster County, South Carolina" dated March 28 ,

2024 with an effective date of December 31, 202 3, prepared by D. Carr, Group Manager,

Metallurgy; D, Londo ño, EVP, Chief Operating Officer, Americas; J. Moore; Group Manager

Resource Development;, B. Drury, Underground Engineering Superintendent; L. Stanbridge (Call

& Nicholas Principal Engineer , Geotechnical ) R. Cook (Call & Nicholas Principal Engineer,

Geological); J.N. Janney-Moore (NewFields Senior Project Manager); W.L. Kingston ( NewFields

Senior Hydrogeologist ); M. Sullivan (SRK Principal Consultant, Mineral Economics); B.M. Miller

(SRK Principal Consultant, Geology); J. Poeck (SRK Principal Consultant, Mining Engineer); and

b) "NI 43-101 Technical Report Macraes Gold Mine Otago, New Zealand" dated March 28, 2024 with

an effective date of December 31 , 2023 , prepared by M. Grant, Senior Geologist, Resource

Development; J. Moore, Group Manager, Resource Development; Knowell Madambi, Manager –

Technical Services and Projects; E. Leslie, Group Mining Engineer; D. Carr, Group Manager,

Metallurgy each of which is an employee of OceanaGold.

Cautionary Statements

Certain information contained in this news 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 and its related subsidiaries. Any statements that expres s 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.sedarplus.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

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.

www.oceanagold.com