CORPORATE PRESENTATION

September 2021

CONSISTENTLY DELIVERING ON COMMITMENTS INNOVATION I PERFORMANCE I GROWTH

CAUTIONARY STATEMENT

Cautionary Notes - Information Purposes Only

The information contained in this presentation is provided by OceanaGold Corporation ("OGC") for informational purposes only and does not constitute an offer to issue or arrange to issue, or the solicitation of an offer to issue, securities of OGC or other financial products. The information contained herein is not investment or financial product advice and has been prepared without taking into account the investment objectives, financial situation or particular needs of any particular person. No representation or warranty, express or implied, is made as to the fairness, accuracy, completeness or correctness of the information, opinions and conclusion contained in this presentation, except as otherwise required by law. To the maximum extent permitted by law, none of OGC or any of its directors, officers, employees or agents accepts any liability, including, without limitation, any liability arising out of fault or negligence, for any loss arising from the use of the information contained in this presentation. Furthermore, this presentation does not constitute an offer of shares for sale in the United States or to any person that is, or is acting for the account or benefit of, any U.S. person (as defined in Regulation S under the United States Securities Act of 1933, as amended (the "Securities Act")) ("U.S. Person"), or in any other jurisdiction in which such an offer would be illegal. OGC's shares have not been and will not be registered under the Securities Act.

Cautionary Statement Concerning Forward Looking Information

This presentation contains information or statements that constitute "forward-looking" information or statements within the meaning of applicable securities laws. Any statements that express or involve discussions with respect to predictions, expectations, beliefs, plans, forecasts, 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, outbreak of an infectious disease, timing of regulatory review or approval of permits, inherent operating risks, and those risk factors identified in OGC's most recent annual information forms prepared and filed with securities regulators which are available on SEDAR at www.sedar.com under OGC's profile.

Specific forward-looking statements and information in this presentation relates to, among other things, future performance and reflects OGC's current expectations only at the date of this presentation regarding the generation of free cash flow, execution of business strategy, regulatory approval timeframe, future growth, future production, estimated costs, results of operations, capital investment, business prospects and opportunities of OGC and its related subsidiaries.

With respect to forward-looking statements or information in this presentation, in making such statements or providing such information OGC has made assumptions regarding, among other things: (i) the accuracy of the estimation of mineral resources and mineral reserves; (ii) that exploration activities and studies will provide results that support anticipated development and extraction activities; (iii) that studies of estimated mine life and production rates at its mineral projects will provide results that support anticipated development and extraction activities; (iv) that OGC will be able to obtain additional financing on satisfactory terms, including financing necessary to advance the development of its projects; (v) that infrastructure anticipated to be developed or operated by third parties, will be developed and/or operated as currently anticipated; (vi) that laws, rules and regulations are fairly and impartially observed and enforced; (vii) that the market prices for gold remain at levels that justify development and/or operation of any mineral project; (viii) that OGC will be able to obtain, maintain, renew or extend required permits and licenses; (ix) that various environmental and social regulations and requirements do not impact OGC's exploration activities or development plans; (x) that key personnel will continue their employment with OGC; (xi) that the COVID-19 outbreak will not materially impact or delay operations at OGC's mineral projects; and (xii) that OGC will be able to remove the blockade restraining operations at Didipio.

All references to Mineral Reserves and Mineral Resources in this presentation are calculated in accordance with the standards set by the Canadian Institute of Mining, Metallurgy and Petroleum. Actual recoveries of mineral products may differ from Mineral Reserves and Mineral Resources as reported due to inherent uncertainties in acceptable estimating techniques. In particular, "Indicated" and "Inferred" Mineral Resources have a great amount of uncertainty as to their existence and economic and legal feasibility. It cannot be assumed that all or any part of an "Indicated" or "Inferred" Mineral Resource will ever be upgraded to a higher category of resource. Readers are cautioned not to assume that all or any part of the mineral deposits in these categories will ever be converted into Proven or Probable Reserves. Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability. The accuracy of any such estimates is a function of the quantity and quality of available data, and of the assumptions made and judgments used in engineering and geological interpretation, the anticipated tonnages and grades that will be mined and the estimated level of recovery that will be realized, which may prove to be unreliable and depend, to a certain extent, upon the analysis of drilling results and statistical inferences that may ultimately prove to be inaccurate. Mineral Resource estimates may have to be re-estimated based on: (i) fluctuations in the price of gold or other mineral prices; (ii) results of drilling; (iii) metallurgical testing and other studies; (iv) proposed mining operations, including dilution; (v) the evaluation of mine plans subsequent to the date of any estimates; and (vi) the possible failure to receive required permits, approvals and licences.

There are no assurances OGC can fulfil forward-looking statements and information or that results implied by such forward-looking statements or information will be achieved. Such forward-looking statements and information are only estimates or forecasts based on current information available to management of OGC as of the date that such predictions are made; actual events or results may differ materially as a result of risks facing OGC, some of which are beyond OGC's control. Although OGC believes that any forward-looking statements and information contained in this presentation are 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. OGC 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.

General Presentation Notes

All AISC and cash costs are net of by-product credits unless otherwise stated

All financials are denominated in US Dollars unless otherwise stated

SEE APPENDIX FOR CONTINUED CAUTIONARY STATEMENT RELATED TO TECHNICAL REPORTS

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OCEANAGOLD OVERVIEW

Global Mid-tier Producer With Significant Organic Growth Pipeline

2021 GUIDANCE (1)

GOLD PRODUCTION

ALL-IN SUSTAINING COSTS

(oz)

(per oz sold (1))

350,000 - 370,000

$1,200 - $1,250

HEALTH, SAFETY & ENVIRONMENT

12MMA TRIFR (2)

MSCI ESG RATING (3)

DIDIPIO OPERATIONS

HAILE OPERATIONS

(per million hours worked)

A

Gold & Copper

Gold & Silver

3.7

2021 Production: 5-10koz Au / ~1 kt Cu

2021 Production: 160-170koz Au

2021 Sales: 23-28 koz Au (6)

2021 AISC: $1100-$1150per oz sold

2021 AISC: $300-$400per oz sold

RESERVES & RESOURCES(4)(5)

WAIHI OPERATIONS

Gold & Silver

2021

Production: 35-45koz Au

P&P RESERVES

M&I RESOURCES

INFERRED RESOURCES

2021

AISC: $1300-$1350per oz sold

6.1 (Moz Gold)

10.0 (Moz Gold)

4.4 (Moz Gold)

MACRAES OPERATIONS

0.15 (Mt Copper)

0.17 (Mt Copper)

0.04 (Mt Copper)

2021

Production: 135-145koz Au

Brisbane HQ

Gold

2021

AISC: $1300-$1350per oz sold

1. Combined AISC is inclusive of $30m of corporate overheads. Only Haile and Macraes exploration capital is included in the Company's AISC. Guidance may also be impacted by operational restrictions or impacts due to

the Covid-19 virus; 2. TRIFR = Total Recordable Injury Frequency rate as of June 30 2021; 3. In 2021, OceanaGold received a rating of "A" in the MSCI ESG Ratings assessment; 4. Reserves & Resources are reported as at Dec 31 2020. Refer to www.oceanagold.com; 5. M&I Resources are inclusive of P&P Reserves. 6. Includes sales of gold-copper concentrate and dore produced in 2019.

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TOP CORPORATE PRIORITIES

Focused on Delivering Value Over the Long-term

  1. SUCCESSFUL RESTART OF DIDIPIO OPERATIONS
  2. DELIVER LONG-TERM VALUE AND RETURNS AT HAILE
  3. CONTINUE TO ADVANCE WKP; EXPAND RESOURCE
  4. DRIVE FURTHER OPERATIONAL COST EFFICIENCIES
  5. ENHANCE CAPITAL ALLOCATION PROGRAM

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FINANCIAL OVERVIEW

Striving to deliver a balanced capital allocation program

Invest in Value

Prudent Balance Sheet

Accretive Growth

Projects

Management

ORGANIC GROWTH IN TOP-

TIER JURISDICTIONS

Return Capital to

Shareholders

1. As at June 30, 2021

Total Liquidity(1)

CASH

UNDRAWN

FACILITIES

$92m

$50m

Total Debt(1)

DRAWN FACILITY

EQUIPMENT

LEASES

$200m

$109m

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OceanaGold Corporation published this content on 13 September 2021 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 13 September 2021 22:21:02 UTC.