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OGC.TO ·

OceanaGold Reports Third Quarter 2025 Results

Financials

November 5, 2025 News Release

OceanaGold Reports Third Quarter 2025 Results

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

• On track to deliver full year guidance with strong Q4 advancing as planned

• Free Cash Flow† of $94 million with $335 million of cash and no debt at quarter end

• Share buyback program increased by 75% to $175M, expected to be completed by year end

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

“Company”) reported its operational and financial results for the three and nine months ended

September 30, 2025 . The condensed interim consolidated financial statements and Management's

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

Third Quarter Highlights

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

• Safely and responsibly produced 103,500 ounces of gold and 3,100 tonnes of copper.

• Waste stripping at Haile and Macraes is well advanced, with higher-grade ore from the open

pits delivered in the third quarter, positioning both sites to deliver a strong fourth quarter.

• All-In Sustaining Cost (“AISC”) † of $2,052 per ounce year to date, expecting to be lower in the

fourth quarter commensurate with increased gold production.

• Record quarterly revenue of $449 million supported by record average realized gold price of

$3,476 per ounce, with no hedges or prepays.

• Quarterly attributable net profit of $87 million, EPS of $0.38 and Adjusted EPS† of $0.40.

• EBITDA Margin† of 46% and Operating Cash Flow Per Share† of $0.93.

• Generated strong Free Cash Flow† of $94 million in the quarter and $283 million year to date,

resulting in a trailing 12-month Free Cash Flow† yield1 of 15%.

• Cash balance increased by 12% from the prior quarter to $335 million with no debt.

• Completed $39 million in share repurchases in the quarter at an average price of CAD$24.14.

• Share buyback program for 2025 increased by 75% to $175 million, with $100 million

repurchased year to date as of November 5, 2025.

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

• Ongoing exploration success at Haile, demonstrating the upside for low-risk organic growth

within the existing portfolio of assets.

• Fast-track permit approval for the Waihi North Project is expected by year-end.

† 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: “The third quarter was another period of safe and

responsible gold production in which we continued to generate substantial Free Cash Flow, despite it

being the planned lowest production quarter of the year. The investment made in waste stripping at Haile

and Macraes throughout 2025 has us in fresh open pit ore at both mines now, which positions us for the

fourth quarter to be our strongest quarter of the year. Permitting of our Waihi North Project, which includes

the high-grade Wharekirauponga underground, is progressing well and we continue to expect approval by

year end - in the interim we are advancing early works activities.

The significant Free Cash Flow we have generated year to date of $283 million has allowed us to pay a

higher dividend in 2025, continue to strengthen our balance sheet and increase our share buyback

program for 2025 by 75% to $175 million. Our focus on investing in attractive organic growth and our

disciplined capital allocation framework reflects our continued commitment to creating value and

delivering strong returns to our shareholders."

Share Buyback and Dividend

As of November 5, 2025, the Company had completed the planned $100 million of share repurchases for

2025. The Board has approved a 75% increase to the share buyback program for 2025, with a total of

$175 million in share buybacks expected to be completed by year end.

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

at the close of business in each jurisdiction on November 19, 2025 (the "Record Date") will be entitled to

receive payment of the dividend on December 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, November 5, 2025

Record Date Wednesday, November 19, 2025

Dividend Payment Date Friday, December 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

Q3 2025 Q2 2025 Q3 2024 YTD 2025 YTD 2024

Gold Produced1

Haile koz 30.0 47.7 64.9 129.2 137.4

Didipio koz 21.9 24.5 27.9 66.9 77.3

Macraes koz 32.8 30.0 28.3 91.2 87.5

Waihi koz 18.8 17.3 13.8 52.9 35.7

Total gold produced1 koz 103.5 119.5 134.9 340.2 337.9

Gold Sales

Haile koz 33.4 49.5 53.6 140.1 134.6

Didipio koz 29.7 20.6 28.9 68.1 79.6

Macraes koz 32.7 34.8 29.5 91.2 88.2

Waihi koz 20.4 16.4 12.8 52.7 35.0

Total Gold sales koz 116.2 121.3 124.8 352.1 337.4

Average Gold Price $/oz 3,476 3,293 2,511 3,212 2,330

Copper Produced1 - Didipio kt 3.1 3.7 3.4 10.2 9.2

Copper Sales - Didipio kt 4.4 3.0 3.5 10.6 8.9

Average Copper Price $/lb 4.44 4.36 4.15 4.37 4.17

Cash Costs†

Haile $/oz 1,981 997 683 1,117 1,152

Didipio $/oz 787 873 824 835 803

Macraes $/oz 1,345 1,496 1,458 1,408 1,185

Waihi $/oz 1,539 1,670 1,538 1,551 1,588

Consolidated Cash Costs† $/oz 1,420 1,210 987 1,203 1,123

AISC†

Haile $/oz 3,464 1,890 1,537 2,127 1,814

Didipio $/oz 1,213 1,287 1,103 1,214 1,075

Macraes $/oz 2,171 2,146 2,099 2,198 2,060

Waihi $/oz 2,039 2,190 2,252 2,080 2,357

Consolidated AISC† $/oz 2,333 2,027 1,729 2,052 1,877

Free Cash Flow† $M 94.4 120.1 65.7 283.3 98.7

Net profit2 $M 87.2 114.1 59.9 301.0 85.3

Adjusted net profit†2 $M 92.9 116.5 65.7 310.1 96.7

EBITDA† $M 205.0 217.1 157.0 614.1 341.3

Adjusted EBITDA† $M 210.7 219.5 162.8 623.2 352.7

Earnings per share - basic2 $/share $0.38 $0.49 $0.25 $1.30 $0.36

Adjusted earnings per share - diluted†2 $/share $0.40 $0.51 $0.27 $1.32 $0.40

Operating Cash Flow per share - diluted† $/share $0.93 $0.99 $0.66 $2.76 $1.40

Free Cash Flow per share-diluted† $/share $0.41 $0.51 $0.27 $1.21 $0.41

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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Conference Call and Webcast:

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

November 6, 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/edmQZrLXkro

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 wholly-owned Haile Gold Mine in the

United States of America; the wholly-owned Macraes and Waihi operations in New Zealand; and the 80%-

owned Didipio Mine in the Philippines.

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, Vice President, Communications

Tel: +1 604-403-2019

[email protected]

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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 Q3 2025 Q2 2025 Q3 2024 YTD 2025 YTD 2024

Net profit 87.2 114.1 59.9 301.0 85.3

Foreign exchange (gain) loss 2.0 2.4 (1.3) 5.2 4.9

Write-down of assets 0.6 — 1.7 0.8 6.4

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

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

NYSE / PSE listing costs 1.6 — 5.4 1.6 10.9

Restructuring / Other costs 1.5 — — 1.5 1.9

Adjusted net profit 92.9 116.5 65.7 310.1 96.7

Adjusted weighted average number of common

shares - fully diluted 233.0 234.8 242.2 234.4 241.8

Adjusted earnings per share 0.40 0.51 0.27 1.32 0.40

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 Q3 2025 Q2 2025 Q3 2024 YTD 2025 YTD 2024

Net profit 93.1 117.6 60.6 311.9 89.3

Depreciation and amortization 62.3 54.9 86.0 170.9 220.7

Net interest expense and finance costs 1.0 1.5 4.3 4.3 16.2

Income tax expense on earnings 48.6 43.1 6.1 127.0 15.1

EBITDA 205.0 217.1 157.0 614.1 341.3

Write-down of assets 0.6 — 1.7 0.8 6.4

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

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

NYSE / PSE listing costs 1.6 — 5.4 1.6 10.9

Restructuring / Other costs 1.5 — — 1.5 1.9

Foreign exchange (gain) loss 2.0 2.4 (1.3) 5.2 4.9

Adjusted EBITDA 210.7 219.5 162.8 623.2 352.7

Revenue 448.5 432.4 345.2 1,240.8 866.7

EBITDA Margin 46% 50% 45% 49% 39%

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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