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OceanaGold Reports Record Quarterly Net Profit

Financials

August 6, 2025 News Release

OceanaGold Reports Record Quarterly Net Profit

(All financial figures in United States dollars unless otherwise stated)

• Produced 119,500 ounces of gold and on track to deliver full year guidance

• Record quarterly net profit of $118 million and record Adjusted EPS† of $0.51

• Free Cash Flow† of $120 million with $299 million of cash and no debt

(VANCOUVER, BC) OceanaGold Corporation (TSX: OGC; OTCQX: OCANF) ("OceanaGold" or the

“Company”) reported its operational and financial results for the three and six months ended June 30,

2025. The condensed interim consolidated financial statements and Management's Discussion and

Analysis (“MD&A”) are available at www.oceanagold.com.

Second Quarter Highlights

• On track to deliver full year production, cost and capital guidance.

• Safely and responsibly produced 119,500 ounces of gold and 3,700 tonnes of copper.

• All-In Sustaining Cost (“AISC”) † of $2,027 per ounce in the quarter, resulting in $1,915 year

to date, at the low-end of guidance range.

• Record quarterly revenue of $432 million supported by record average realized gold price of

$3,293 per ounce, with no hedges or prepays.

• Record quarterly net profit of $118 million, record EPS of $0.49 and Adjusted EPS† of $0.51.

• EBITDA Margin† of 50% and Operating Cash Flow Per Share† of $0.99.

• Generated strong Free Cash Flow† of $120 million and $189 million year to date, resulting in a

trailing 12 month Free Cash Flow† yield1 of 18%.

• Cash balance increased by 31% to $299 million from the prior quarter, enhancing an already

strong balance sheet with no debt.

• Repurchased $21 million in common shares during the quarter and $41 million year to date

under the share buyback program. On track to buyback up to $100 million of shares in 2025.

• Declared a $0.03 per share quarterly dividend, payable in September 2025.

• Completed a 3-for-1 share consolidation in preparation for a planned listing on the New York

Stock Exchange in the first half of 2026.

• Released new drill results at Wharekirauponga extending the strike length, continuing to

demonstrate its upside potential.

† See “Non-IFRS Financial Information”

1 Calculated as trailing 12 month Free Cash Flow† over the average trailing 12 month market capitalization in USD.

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Gerard Bond, President and CEO of OceanaGold, said: “We are pleased to have had another safe,

responsible and strong quarter, with us being on track to deliver full year production, cost and capital

guidance. Our production and cost performance, together with being a fully unhedged gold producer with

no prepays, drove record quarterly net profit and earnings per share, and delivered strong Free Cash

Flow. With no debt and a strengthening cash balance, our exceptional financial position continues to

provide us the flexibility to invest in our exciting organic growth opportunities and deliver enhanced

shareholder returns via dividends and our recently renewed and expanded share buyback program.

Looking ahead, open pit waste stripping is advancing as planned at Haile in Ledbetter Phase 3 and at

Macraes in Innes Mills Phase 8, setting us up for a strong fourth quarter and 2026 as we gain access to

higher grade ore at our two largest sites. Permitting of our Waihi North Project, which includes the high-

grade Wharekirauponga underground, is progressing and we continue to expect approval by year end.

Building on the success at Wharekirauponga, where we recently announced an extension of the strike

length, exploration is ongoing on promising targets at all sites as we remain focused on unlocking

additional value for shareholders."

Share Buyback and Dividend

In the first half of 2025, the Company repurchased 3.9 million common shares for consideration of

$40.6 million . The Board approved in February 2025 the repurchase in 2025 of up to $100 million of

common shares under the Company's NCIB ("Normal Course Issuer Bid") program announced in July

2024. The NCIB was recently extended for another 12 months and upsized to be for up to 10% of issued

capital.

OceanaGold has declared a $0.03 per share dividend payable in September 2025. Shareholders of

record at the close of business in each jurisdiction on August 20, 2025 (the "Record Date") will be entitled

to receive payment of the dividend on September 19, 2025. The dividend payment applies to holders of

record of the Company's common shares traded on the Toronto Stock Exchange.

Declaration of Dividend Wednesday, August 6, 2025

Record Date Wednesday, August 20, 2025

Dividend Payment Date Friday, September 19, 2025

Dividends are payable in United States dollars. Shareholders in other jurisdictions can elect to participate

in Computershare’s international payments service if they want to receive dividends in an alternative

currency. This dividend qualifies as an ‘eligible dividend’ for Canadian income tax purposes.

† See “Non-IFRS Financial Information”

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Results Overview

Q2 2025 Q1 2025 Q2 2024 YTD 2025 YTD 2024

Gold Produced1

Haile koz 47.7 51.6 37.8 99.3 72.5

Didipio koz 24.5 20.6 23.1 45.1 49.4

Macraes koz 30.0 28.4 26.9 58.4 59.2

Waihi koz 17.3 16.8 10.4 34.1 21.9

Total gold produced1 koz 119.5 117.4 98.2 236.9 203.0

Gold Sales

Haile koz 49.5 57.2 39.8 106.7 81.0

Didipio koz 20.6 17.8 18.9 38.4 50.7

Macraes koz 34.8 23.7 26.5 58.5 58.7

Waihi koz 16.4 15.9 10.6 32.3 22.2

Total Gold sales koz 121.3 114.6 95.8 235.9 212.6

Average Gold Price $/oz 3,293 2,858 2,385 3,082 2,224

Copper Produced1 - Didipio kt 3.7 3.4 2.8 7.1 5.8

Copper Sales - Didipio kt 3.0 3.2 2.2 6.2 5.4

Average Copper Price $/lb 4.36 4.27 4.58 4.32 4.18

Cash Costs†

Haile $/oz 997 715 1,351 846 1,462

Didipio $/oz 873 871 874 872 791

Macraes $/oz 1,496 1,369 1,085 1,444 1,047

Waihi $/oz 1,670 1,445 1,635 1,559 1,617

Consolidated Cash Costs† $/oz 1,210 976 1,213 1,096 1,203

AISC†

Haile $/oz 1,890 1,551 2,008 1,708 1,998

Didipio $/oz 1,287 1,130 1,250 1,214 1,059

Macraes $/oz 2,146 2,313 2,319 2,213 2,041

Waihi $/oz 2,190 2,019 2,434 2,106 2,418

Consolidated AISC† $/oz 2,027 1,796 2,131 1,915 1,963

Free Cash Flow† $M 120.1 68.8 31.2 188.9 33.0

Net profit $M 117.6 101.2 34.0 218.8 28.7

Adjusted net profit† $M 120.0 102.2 30.6 222.2 34.3

EBITDA† $M 217.1 192.0 112.4 409.1 184.3

Adjusted EBITDA† $M 219.5 193.0 109.0 412.5 189.9

Earnings per share - basic2 $/share $0.49 $0.43 $0.13 $0.92 $0.11

Adjusted earnings per share - diluted†2 $/share $0.51 $0.43 $0.13 $0.94 $0.14

Operating Cash Flow per share - diluted† $/share $0.99 $0.83 $0.41 $1.82 $0.73

Free Cash Flow per share-diluted† $/share $0.51 $0.29 $0.13 $0.80 $0.14

1 Production is reported on a 100% basis as all operations are controlled by OceanaGold.

2 Attributable to the shareholders of the Company.

† See “Non-IFRS Financial Information”

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Management Update

The Company is pleased to announce that Mr. Keenan Jennings has been appointed Chief Exploration

Officer effective September 29, 2025. Mr. Jennings will replace Craig Feebrey who is retiring after 10

years with OceanaGold. Mr. Jennings brings over 35 years of global experience in mineral exploration

and executive leadership, having held senior roles at BHP, Rio Tinto, and Anglo American.

The Company also announces th at Peter Sharpe, Chief Operating Officer-Asia Pacific, is leaving

OceanaGold to pursue other opportunities outside the gold industry. His last day with the Company will be

October 24, 2025. Bhuvanesh Malhotra, current Chief Technical and Project Officer, will become Chief

Operating Officer for all operations from September 26, 2025. Mr. Malhotra has been with the Company

since early 2024 and has over 25 years of experience in operational and technical roles across multiple

commodities and mining methods, driving safety performance, operational e xcellence and sustainable

transformational change.

The Company thanks Mr. Feebrey and Mr. Sharpe for their tremendous contributions to OceanaGold and

wishes them both well in the future.

Conference Call and Webcast:

Senior management will host a conference call and webcast to discuss the quarterly results on Thursday,

August 7, 2025 at 10:00 am EST (7:00 am PST). To participate in the conference call, please use one of

the following methods:

Webcast: https://app.webinar.net/Pop3el0eA1a

Toll-free North America: +1 888-510-2154

International: +1 437-900-0527

If you are unable to attend the call, a recording will be made available on the Company's website.

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 Zealand.

For further information please contact:

Investor Relations:

Haley Mayers, Vice President, Investor Relations

Tel: +1 604-678-4097

[email protected]

Valerie Burns, Manager, Investor Relations

Tel: +1 604-235-0742

[email protected]

Media Relations:

Louise Burgess, Director, Communications

Tel: +1 604-403-2019

[email protected]

† See “Non-IFRS Financial Information”

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Cautionary Statement for Public Release

This public release contains certain “forward-looking statements” and “forward-looking

information” (collectively, “forward-looking statements”) within the meaning of applicable Canadian

securities laws which may include, but is not limited to, statements with respect to the future financial and

operating performance of the Company, its mining projects, the future price of gold, the estimation of

mineral reserves and mineral resources, the realization of mineral reserve and resource estimates, costs

of production, estimates of initial capital, sustaining capital, operating and exploration expenditures, costs

and timing of the development of new deposits, costs and timing of the development of new mines, costs

and timing of future exploration and drilling programs, timing of filing of updated technical information,

anticipated production amounts, requirements for additional capital, governmental regulation of mining

operations and exploration operations, timing and receipt of approvals, consents and permits under

applicable legislation, environmental risks, title disputes or claims, limitations of insurance coverage and

the timing and possible outcome of pending litigation and regulatory matters. All statements in this public

release that address events or developments that we expect to occur in the future are forward-looking

statements. Forward-looking statements are statements that are not historical facts and are generally,

although not always, identified by words such as “may”, “plans”, “expects”, “projects”, “is expected”,

“scheduled”, “potential”, “estimates”, “forecasts”, “intends”, “targets”, “aims”, “anticipates” or “believes” or

variations (including negative variations) of such words and phrases, or may be identified by statements

to the effect that certain actions, events or results “may”, “could”, “would”, “should”, “might” or “will” be

taken, occur or be achieved.

Forward-looking statements involve known and unknown risks, uncertainties and other factors which may

cause the actual results, performance or achievements of the Company to be materially different from any

future results, performance or achievements expressed or implied by the forward-looking statements.

Such risks include, among others: future prices of gold; general business; economic and market factors

(including changes in global, national or regional financial, credit, currency or securities markets);

changes or developments in global, national or regional political and social conditions; changes in laws

(including tax laws) and changes in IFRS or regulatory accounting requirements; the actual results of

current production, development and/or exploration activities; conclusions of economic evaluations and

studies; fluctuations in the value of the United States dollar relative to the Canadian dollar, the Australian

dollar, the Philippines Peso or the New Zealand dollar; changes in project parameters as plans continue

to be refined; possible variations of ore grade or recovery rates; failure of plant, equipment or processes

to operate as anticipated; accidents, labour disputes and other risks of the mining industry; political

instability or insurrection or war; labour force availability and turnover; adverse judicial decisions, inability

or delays in obtaining financing or governmental approvals; inability or delays in the completion of

development or construction activities or in the re-commencement of operations; legal challenges to

mining and operating permits including the FTAA as well as those factors identified and described in more

detail in the section entitled “Risk Factors” contained in the Company’s most recent Annual Information

Form and the Company’s other filings with Canadian securities regulators, which are available on

SEDAR+ at sedarplus.com under the Company’s name. The list is not exhaustive of the factors that may

affect the Company's forward-looking statements.

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The Company’s forward-looking statements are based on the applicable assumptions and factors

Management considers reasonable as of the date hereof, based on the information available to

Management at such time. These assumptions and factors include, but are not limited to, assumptions

and factors related to: the Company’s ability to carry on current and future operations, including:

development and exploration activities; the timing, extent, duration and economic viability of such

operations, including any mineral resources or reserves identified thereby; the accuracy and reliability of

estimates, projections, forecasts, studies and assessments; the Company’s ability to meet or achieve

estimates, projections and forecasts; the availability and cost of inputs; the price and market for outputs,

including gold; foreign exchange rates; taxation levels; the timely receipt of necessary approvals or

permits; the ability to meet current and future obligations; the ability to obtain timely financing on

reasonable terms when required; the current and future social, economic and political conditions; and

other assumptions and factors generally associated with the mining industry.

The Company’s forward-looking statements are based on the opinions and estimates of Management and

reflect their current expectations regarding future events and operating performance and speak only as of

the date hereof. The Company does not assume any obligation to update forward-looking statements if

circumstances or Management's beliefs, expectations or opinions should change other than as required

by applicable law. There can be no assurance that forward-looking statements will prove to be accurate,

and actual results, performance or achievements could differ materially from those expressed in, or

implied by, these forward-looking statements. Accordingly, no assurance can be given that any events

anticipated by the forward-looking statements will transpire or occur, or if any of them do, what benefits or

liabilities the Company will derive therefrom. For the reasons set forth above, undue reliance should not

be placed on forward-looking statements.

Non-IFRS Financial Information

Adjusted Net Profit/(Loss) and Adjusted Earnings/(Loss) per share

These are used by Management to measure the underlying operating performance of the Company.

Management believes these measures provide information that is useful to investors because they are

important indicators of the strength of the Company’s operations and the performance of its core

business. Accordingly, such measures are intended to provide additional information and should not be

considered in isolation as a substitute for measures of performance prepared in accordance with IFRS.

Adjusted Net Profit/(Loss) is calculated as Net Profit/(Loss) less the impact of impairment expenses,

write-downs, foreign exchange (gains)/losses, gain on sale of assets, OGP listing costs and restructuring

costs related to transitioning certain corporate activities from Australia to Canada.

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The following table provides a reconciliation of Adjusted Net Profit/(Loss) and Adjusted Earnings/(Loss)

per share:

$M, except per share amounts Q2 2025 Q1 2025 Q2 2024 YTD 2025 YTD 2024

Net profit 117.6 101.2 34.0 218.8 28.7

Foreign exchange (gain) loss 2.4 0.8 (0.1) 3.2 6.2

Write-down of assets — 0.2 3.5 0.2 4.7

Gain on sale of Blackwater project — — (17.6) — (17.6)

Tax expense on sale of Blackwater project — — 4.9 — 4.9

OGP listing costs — — 5.5 — 5.5

Restructuring costs — — 0.4 — 1.9

Adjusted net profit 120.0 102.2 30.6 222.2 34.3

Adjusted weighted average number of common

shares - fully diluted 234.8 238.3 242.8 235.4 241.0

Adjusted earnings per share 0.51 0.43 0.13 0.94 0.14

EBITDA and Adjusted EBITDA

Management believes that Adjusted EBITDA is a valuable indicator of its ability to generate liquidity by

producing operating cash flows to fund working capital needs, service debt obligations and fund capital

expenditures. EBITDA is defined as earnings before interest, tax, depreciation and amortization. Adjusted

EBITDA is calculated as EBITDA less the impact of impairment expenses, write-downs, gains/losses on

disposal of assets, OGP listing costs, foreign exchange gains/losses and other non-recurring costs.

EBITDA Margin is calculated as EBITDA divided by revenue.

Prior to the first quarter of 2024, Adjusted EBITDA was calculated using an adjustment for a specific

portion of unrealized foreign exchange gains/losses rather than the total foreign exchange gain/loss. The

comparative quarters have been recalculated adjusting for all foreign exchange gains/losses.

The following table provides a reconciliation of EBITDA, Adjusted EBITDA and EBITDA Margin:

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$M Q2 2025 Q1 2025 Q2 2024 YTD 2025 YTD 2024

Net profit 117.6 101.2 34.0 218.8 28.7

Depreciation and amortization 54.9 53.7 69.9 108.6 134.7

Net interest expense and finance costs 1.5 1.8 6.5 3.3 11.9

Income tax expense on earnings 43.1 35.3 2.0 78.4 9.0

EBITDA 217.1 192.0 112.4 409.1 184.3

Write-down of assets — 0.2 3.5 0.2 4.7

Gain on sale of Blackwater project — — (17.6) — (17.6)

Tax expense on sale of Blackwater project — — 4.9 — 4.9

OGP listing costs — — 5.5 — 5.5

Restructuring expense — — 0.4 — 1.9

Foreign exchange (gain) loss 2.4 0.8 (0.1) 3.2 6.2

Adjusted EBITDA 219.5 193.0 109.0 412.5 189.9

Revenue 432.4 359.9 251.2 792.3 521.5

EBITDA Margin 50% 53% 45% 52% 35%

Cash Costs and AISC

Cash Costs are a common financial performance measure in the gold mining industry; however, it has no

standard meaning under IFRS. Management uses this measure to monitor the performance of its mining

operations and its ability to generate positive cash flows, both on an individual site basis and an overall

company basis. Cash Costs include mine site operating costs plus indirect taxes and selling cost net of

by-product sales and are then divided by ounces sold. In calculating Cash Costs, the Company includes

copper and silver by-product credits as it considers the cost to produce the gold is reduced as a result of

the by-product sales incidental to the gold production process, thereby allowing Management and other

stakeholders to assess the net costs of gold production. The measure is not necessarily indicative of cash

flow from operations under IFRS or operating costs presented under IFRS.

Management believes that the AISC measure provides additional insight into the costs of producing gold

by capturing all of the expenditures required for the discovery, development and sustaining of gold

production and allows the Company to assess its ability to support capital expenditures to sustain future

production from the generation of operating cash flows, both on an individual site basis and an overall

company basis, while maintaining current production levels. Management believes that, in addition to

conventional measures prepared in accordance with IFRS, certain investors use this information to

evaluate the Company’s performance and ability to generate cash flow per ounce sold. AISC is calculated

as the sum of Cash Costs, capital expenditures and exploration costs that are sustaining in nature and

corporate G&A costs. AISC is divided by ounces sold to arrive at AISC per ounce.

Prior to the first quarter of 2025, Didipio’s AISC calculation excluded local corporate G&A costs which is

consistent with the calculation of AISC for the other operations. In order to align the Company’s reporting

of AISC with local reporting requirements in the Philippines, Management has included local corporate

G&A costs in Didipio’s AISC calculation beginning in the first quarter of 2025.

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