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OGC.TO ·

OceanaGold Reports Second Quarter 2026 Results (All financial figures in United States dollars unless otherwise stated)

Financings Financials Corporate Updates

NEWS RELEASE

August 5, 2026

OceanaGold Reports Second Quarter 2026 Results

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

• Produced 138,800 ounces of gold, on track to deliver on full year guidance.

• Strong Free Cash Flow† of $130 million, with cash of $655 million and no debt at quarter end.

• Advanced growth projects and returned $78 million to shareholders via buybacks and dividends.

VANCOUVER, BC - OceanaGold Corporation (TSX: OGC, NYSE: OGC) ("OceanaGold" or the “Company”)

reported its operational and financial results for the three and six months ended June  30, 2026 . The

consolidated financial statements and Management's Discussion and Analysis (“MD&A”) are available at

www.oceanagold.com.

Second Quarter Highlights

• On track to achieve full year production, cost and capital guidance, with production expected to

increase and costs to decrease in the second half of 2026.

• Safely and responsibly produced 138,800 ounces of gold and 2,700 tonnes of copper, an increase in

gold production of 7% from the prior quarter.

• All-In Sustaining Cost (“AISC”) † of $2,151 per ounce in the quarter, expected to decrease in the second

half of 2026 with higher gold production and lower sustaining capital.

• Revenue of $647 million at an average realized gold price of $4,433 per ounce, reflecting gold sales

weighted towards the end of the quarter as gold production increased at Haile.

• Net profit1 of $222 million, EPS of $0.99 and record adjusted EBITDA Margin† of 61%.

• Generated strong quarterly Operating Cash Flow of $314 million.

• Free Cash Flow† of $130 million, and $385 million year to date.

• Cash balance increased by 6% to $655 million with no debt and revolving credit facility undrawn.

• Returned $78 million to shareholders in the quarter, via dividends and share buybacks.

• Completed $58 million in share buybacks during the quarter and $134 million year to date, with up to

$350 million approved for 2026.

• Listed on the New York Stock Exchange ("NYSE") on April 7, 2026, with trading volumes increasing.

• Reported additional high-grade drill results at Haile, highlighting the ongoing success of drilling to support

resource growth and conversion, and continuing to demonstrate upside potential.

• Development of the decline towards Wharekirauponga commenced in May 2026, progressing to plan.

• Macraes produced its 6 millionth ounce of gold in July 2026, since beginning production in 1990.

† See “Non-IFRS Financial Information”

1 Attributable to the shareholders of the Company.

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Gerard Bond, President and CEO of OceanaGold, said “We are pleased to deliver another quarter of solid

gold production, generating strong free cash flow which allows us to invest in our attractive organic growth

projects, strengthen our balance sheet and still return meaningful capital to shareholders. During the quarter

we commenced development of the decline towards the high-grade Wharekirauponga orebody, a significant

milestone in advancing the Waihi North Project, and are progressing to plan. At Haile, we continued to

progress the Palomino decline and released additional high-grade drill results that further demonstrate our

ability to add value through the drill bit. With increased gold production expected in the second half of the

year we remain focused on delivering on our guidance, reducing our unit costs, generating further free cash

flow and continuing to create value for our shareholders."

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Results Overview

Q2 2026 Q1 2026 Q2 2025 YTD 2026 YTD 2025

Gold Produced1

Haile koz 59.5 41.6 47.7 101.1 99.3

Macraes koz 41.4 51.5 30.0 92.9 58.4

Waihi koz 16.5 16.6 17.3 33.1 34.1

Didipio koz 21.4 20.4 24.5 41.8 45.1

Total gold produced1 koz 138.8 130.1 119.5 268.9 236.9

Gold Sales

Haile koz 53.1 47.3 49.5 100.4 106.7

Macraes koz 45.9 47.9 34.8 93.8 58.5

Waihi koz 16.4 17.6 16.4 34.0 32.3

Didipio koz 20.4 22.6 20.6 43.0 38.4

Total Gold sales koz 135.8 135.4 121.3 271.2 235.9

Average Gold Price $/oz 4,433 4,894 3,293 4,663 3,082

Copper Produced1 - Didipio kt 2.7 3.2 3.7 5.9 7.1

Copper Sales1 - Didipio kt 2.6 3.3 3.0 5.9 6.2

Average Copper Price $/lb 6.40 6.10 4.36 6.23 4.32

Silver Produced koz 126.8 130.7 160.1 257.5 322.8

Cash Costs†

Haile $/oz 1,442 1,779 997 1,601 846

Macraes $/oz 1,237 970 1,496 1,101 1,444

Waihi $/oz 2,262 1,556 1,670 1,896 1,559

Didipio $/oz 706 748 873 728 872

Consolidated Cash Costs† $/oz 1,362 1,292 1,210 1,327 1,096

AISC†

Haile $/oz 1,953 2,637 1,890 2,275 1,708

Macraes $/oz 1,932 1,506 2,146 1,715 2,213

Waihi $/oz 2,840 2,155 2,190 2,485 2,106

Didipio $/oz 1,589 1,298 1,287 1,436 1,214

Consolidated AISC† $/oz 2,151 2,094 2,027 2,123 1,915

Free Cash Flow† $M 130.1 255.2 120.1 385.3 188.9

Net profit2 $M 222.2 228.4 114.1 450.6 213.8

Adjusted net profit†2 $M 221.2 229.5 116.5 450.7 217.2

EBITDA† $M 399.0 416.7 217.1 815.7 409.1

Adjusted EBITDA† $M 398.0 417.8 219.5 815.8 412.5

Earnings per share - diluted2,3 $/share $0.99 $1.01 $0.49 $1.99 $0.91

Adjusted earnings per share - diluted†2,3 $/share $0.98 $1.01 $0.51 $2.00 $0.94

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

2 Attributable to the shareholders of the Company.

3 Quarterly amounts do not sum to year-to-date amounts due to the weighting of the number of shares outstanding.

† See “Non-IFRS Financial Information”

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Outlook

The Company’s 2026 production, cost and capital Guidance is outlined in the table below and remains

unchanged.

Production is expected to increase in the second half of the year, with consolidated third quarter production

expected to be similar to the second quarter, and the fourth quarter being the strongest of the year.

At Haile, gold production is expected to increase in the third quarter, then again in the fourth quarter driven

by higher grades mined in the Ledbetter Phase 3 open pit and the Horseshoe Underground. Macraes

production is expected to be lower in the third and fourth quarters as per plan, while production at Waihi is

expected to remain relatively consistent through the remainder of the year. At Didipio, production is expected

to be higher in the third and fourth quarters driven by an increase in underground mining rates.

Consolidated AISC † is anticipated to be near the upper end of the Company’s 2026 Guidance range,

reflecting labour cost inflation, continued investment in maintenance and reliability improvements,

unhedged energy costs and lower silver by-product credits. Consolidated AISC † is expected to be lower in the

third quarter and again in the fourth quarter, underpinned by lower sustaining capital and higher production

at Haile. AISC † at each of Haile, Didipio and Waihi is expected to reduce in the second half of the year. AISC †

at Macraes is expected to increase in the second half, with its full-year AISC † expected to be within its

Guidance range.

Total capital investment guidance remains unchanged, with spending on growth capital expected to increase

in the second half of the year, primarily driven by the continued investment in the Waihi North and Palomino

Underground Projects and waste stripping activities at Haile, while sustaining capital across the portfolio is

expected to decrease in the second half of the year.

2026 Full-Year Guidance

Production & Costs1 Haile Macraes Waihi Didipio Consolidated

Gold Production koz 235 - 260 135 - 155 60 - 75 85 - 105 520 - 590

Copper Production kt — — — — — — — — — 13 - 15 13 - 15

Cash Costs†,2 $/oz 970 - 1,070 1,275 - 1,375 1,600 - 1,800 615 - 715 1,050 - 1,200

AISC†,2 $/oz 1,500 - 1,700 1,950 - 2,150 2,100 - 2,300 975 - 1,100 1,750 - 1,900

† See “Non-IFRS Financial Information”

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Capital Investments1,3,4

($M) Haile Macraes Waihi Didipio Consolidated Included in

AISC†

Sustaining capital 95 30 15 25 170 170

Pre-strip and Capitalized

Mining 45 65 15 10 135 135

Growth 90 10 160 20 280 —

Exploration 10 10 25 10 60 15

Total Investments 240 115 215 65 645 320

1 Production is on a 100% basis as all operations are controlled by OceanaGold. Assumes a NZD to USD exchange rate of 0.58.

2 Includes by-product allocations based on a copper price of $5.85 per pound and a silver price of $95 per ounce.

3 Excludes capital leases.

4 Capital Investments Guidance range of ±5%; Consolidated includes corporate capital.

Waihi North Project

OceanaGold is permitted to develop and operate the Waihi North Project, which includes the high-grade

Wharekirauponga Underground mine. Construction and underground tunnelling activity to the underground

mine continues to ramp up with overall project development progressing on schedule for first ore in 2032.

Following completion of the portal, decline development commenced in May 2026 and is progressing in line

with plan, nearing 200 metres to date. The next key milestone involves the addition of a second jumbo to

begin the twin incline towards the Wharekirauponga orebody.

Execution of bulk earthworks accelerated at the Willows Portal site in the second quarter and earthwork

activities related to drainage, dams, roads, magazine and the surface facilities area remain on track for

completion by year-end. Construction of the services trench connecting the existing Waihi operations with

the Willows surface facilities, providing power, water and communications infrastructure, was completed in

July. Construction of the water treatment plant remains ongoing, with commissioning expected by the end of

the third quarter. Early works activities on TSF 3 are expected to commence in the fourth quarter.

Dividend

OceanaGold has declared a $0.09 per share dividend payable in September 2026. Shareholders of record at

the close of business in each jurisdiction on August 19, 2026 (the "Record Date") will be entitled to receive

payment of the dividend on September 18, 2026. The dividend payment applies to holders of record of the

Company's common shares traded on the TSX and the NYSE.

Declaration of Dividend Wednesday August 5, 2026

Record Date Wednesday August 19, 2026

Dividend Payment Date Friday September 18, 2026

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.

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Share Buyback

In the first half of 2026, the Company completed $134 million of share repurchases. In February, the

Company announced approval to apply up to $350 million towards share buybacks in 2026. The Company

recently renewed its Normal Course Issuer Bid for another 12 months.

Conference Call and Webcast:

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

August 6, 2026 at 10:00 am EDT (7:00 am PDT). To participate in the conference call, please use one of the

following methods:

• Webcast: https://app.webinar.net/Px0arqjVm9v

• 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 global 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:

Brian Martin, SVP, Business Development and Investor Relations

Tel: +1 604-678-4096

[email protected]

Valerie Burns, Director, 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 news release contains certain “forward-looking statements” and “forward-looking information” (collectively,

“forward-looking statements”) within the meaning of applicable Canadian and United States securities laws which may

include, but are not limited to, statements with respect to: the Company’s planned production, cost and capital

Guidance for 2026; the future financial and operating performance of the Company and its mining projects and the

anticipated benefits therefor; the development, expansion and operation of the Company’s mining projects; anticipated

production levels and mine lives; the estimation, realization and classification of Mineral Reserves and Mineral

Resources; costs of production; estimates of growth capital, sustaining capital, operating and exploration expenditures;

costs and timing of the development of new deposits and mines; the availability of, and access to, labour, equipment,

power, diesel, water and other inputs; the timing, cost and outcome of development, construction and expansion

activities; timing for the execution of bulk earthworks, construction and commissioning of the water treatment plant and

first ore at the Waihi North Project; costs and timing of future exploration and drilling programs, including the Company’s

site and regional exploration programs; water management initiatives and strategies and tailings management initiatives

at the Company’s operations; requirements for additional capital; the adequacy of current financial resources and cash

reserves; governmental regulation of mining operations and exploration operations; the timing and receipt of required

permits, certifications, approvals, consents and renewals under applicable legislation; the amount of and timing for

anticipated purchases under the NCIB program; the payment of dividends in future periods; compliance with applicable

environmental, social, health and safety and other regulatory requirements; geotechnical and operational conditions;

social licence to operate and stakeholder relationships; competition for mineral properties; the availability and terms of

financing; foreign operations and political, economic and regulatory conditions in the jurisdictions in which the Company

operates; expectations regarding the impacts of the U.S.-Iran international conflict on the Company’s operations,

including potential impacts to operating and capital costs; governmental regulation of mining operations and exploration

operations; fluctuations in commodity prices, including gold, copper and silver, and foreign exchange rates; anticipated

environmental risks; the limitations and adequacy of insurance coverage; title matters, disputes, claims and land access;

changes in laws, taxation and accounting standards; and the timing and possible outcome of pending legal proceedings,

regulatory matters and other disputes, including the appeal to the permit approval for the Waihi North Project.

All statements in this news release that address events or developments that the Company expects 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: the risk of not achieving the Company’s production estimates, forecasts or Guidance; inaccuracy of Mineral

Reserves, Mineral Resources and operating and capital cost estimates; the actual results of current and future

production, development and/or exploration activities; possible variations of ore grade, metallurgy or recovery rates;

changes in mine plans, project parameters or assumptions as plans continue to be refined; delays in, or inability to

complete, development or construction or expansion activities or to re-commence or sustain operations as planned;

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failures or underperformance of plant, equipment, infrastructure or processes; geotechnical risks or events, including

open pit wall stability, crown pillar failure, land subsidence and tailings dam failures; scarcity in and disruption of global

supply chain and/or increases in prices, including as a result of international conflicts, such as the U.S.-Iran conflict;

challenges associated with effective water management; environmental, health and safety and climate-related risks;

risks related to community acceptance, stakeholder engagement and social licence to operate; competition for mineral

properties and other growth opportunities; legal and regulatory challenges to current and future permits, certifications,

approvals or licences; adverse judicial, regulatory or governmental decisions; delays in, or inability to obtain, financing or

governmental approvals on acceptable terms; changes in laws, regulations, taxation regimes, regulated accounting

standards or their interpretation or application; the risks associated with operating in foreign jurisdictions, including

political instability, changes in policy or law, civil unrest, blockades or conflict; fluctuations in the prices of gold, copper

and silver; general business, economic and market conditions (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; fluctuations in foreign exchange rates, including the value of the U.S. dollar relative to the Canadian dollar,

the New Zealand dollar or the Philippine peso; trade policies and tensions, including tariffs; inflationary pressure; labour

availability, retention and turnover; accidents, labour disputes, work stoppages and other operational risks of the mining

industry; limitations of insurance coverage or uninsured risks; the conclusions of economic evaluations, studies and

models; information technology, artificial intelligence and cybersecurity risks; and those other 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 and the U.S. Securities and

Exchange Commission (“SEC”), which are available under the Company’s profile on SEDAR+ at sedarplus.ca and on

EDGAR at sec.gov, respectively, and on the Company’s website at oceanagold.com. The list is not exhaustive of the

factors that may affect the Company's forward-looking statements.

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: exploration and development activities; the timing, extent, duration and

economic viability of such operations; the accuracy and reliability of estimates, projections, forecasts, studies and

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

and cost of inputs; the price and market for outputs, including gold, copper and silver; foreign exchange rates; taxation

levels; the timely receipt of necessary permits, certifications, approvals or licences; 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 laws. 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

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