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OceanaGold Reports Third Quarter 2024 Operating and Financial

Corporate Updates

† See “Non-IFRS Financial Information”

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November 6, 2024 News Release

OceanaGold Reports Third Quarter 2024 Operating and Financial

Results

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

(VANCOUVER) 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, 2024. The condensed interim consolidated financial statements and Management's

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

Highlights

• Produced 134,900 ounces of gold and 3,400 tonnes of copper, a 37% increase in gold

production from the prior quarter.

• Increased quarterly production from all sites, including record gold production from Haile.

• All-In Sustaining Cost† improved to $1,729 per ounce, based on 124,800 ounces sold.

• Net Profit of $61 million and EPS of $0.08 (Adjusted EPS† of $0.09).

• EBITDA margin of 45%.

• Achieved Free Cash Flow† inflection point with $66 million generated during the quarter,

• Repaid $40 million on the credit facility during the quarter and $25 million in October.

• Repurchased $7.8 million of common shares, under the share buy back program.

• Net Cash† increased to $72 million at September 30, 2024.

• Expect to deliver a strong fourth quarter, with consolidated gold production between

142,000 and 162,000 ounces and consolidated AISC between $1,400 and $1,650 per ounce in

the quarter.

Gerard Bond, President and CEO of OceanaGold, said "We are pleased to have delivered higher gold

production in the quarter, with Haile delivering a record 64,900 ounces. Record high gold prices helped

drive an increase in Free Cash Flow generation of nearly $100 million year to date, which allowed us to

continue to strengthen the balance sheet and increase capital returns to our shareholders.

Looking ahead, the fourth quarter should be our strongest of the year and we expect to continue to

generate substantial Free Cash Flow. This will enable us to continue to advance our organic growth

opportunities, such as the Waihi North Project, while also delivering returns for our shareholders."

† See “Non-IFRS Financial Information”

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Q3 2024 Q2 2024 Q3 2023 YTD 2024 YTD 2023

Gold Produced1

Haile koz 64.9 37.8 23.0 137.4 114.7

Didipio koz 27.9 23.1 30.5 77.3 95.7

Macraes koz 28.3 26.9 34.6 87.5 100.9

Waihi koz 13.8 10.4 10.9 35.7 35.9

Total gold produced1 koz 134.9 98.2 99.0 337.9 347.2

Gold Sales

Haile koz 53.6 39.8 23.2 134.6 116.6

Didipio koz 28.9 18.9 29.7 79.6 95.9

Macraes koz 29.5 26.5 34.0 88.2 100.8

Waihi koz 12.8 10.6 11.0 35.0 35.8

Total gold sales koz 124.8 95.8 97.9 337.4 349.1

Average Gold Price $/oz 2,511 2,385 1,934 2,330 1,942

Copper Produced1 - Didipio koz 3.4 2.8 3.4 9.2 10.3

Copper Sales - Didipio koz 3.5 2.2 3.1 8.9 9.9

Average Copper Price $/lb 4.15 4.58 3.76 4.17 3.90

Cash Costs†

Haile $/oz 683 1,351 1,063 1,152 720

Didipio $/oz 824 874 754 803 642

Macraes $/oz 1,458 1,085 1,004 1,185 1,034

Waihi $/oz 1,538 1,635 1,549 1,588 1,284

Consolidated Cash Costs† $/oz 987 1,213 1,003 1,123 847

AISC†

Haile $/oz 1,537 2,008 3,047 1,814 1,755

Didipio $/oz 1,103 1,250 872 1,075 727

Macraes $/oz 2,099 2,319 1,550 2,060 1,611

Waihi $/oz 2,252 2,434 2,196 2,357 1,949

Consolidated AISC† $/oz 1,729 2,131 1,911 1,877 1,563

Free Cash Flow†2 $M 65.7 31.2 (29.6) 98.7 26.3

Net profit (loss) $M 60.6 34.0 (5.5) 89.3 102.0

Adjusted net profit† $M 66.4 30.6 0.1 100.7 113.5

Adjusted EBITDA† $M 162.8 109.0 64.8 352.7 323.2

Earnings (loss) per share3 $/share $0.08 $0.04 $(0.01) $0.12 $0.14

Adjusted earnings per share†3 $/share $0.09 $0.04 $0.00 $0.14 $0.16

Operating Cash Flow per share† $/share $0.22 $0.14 $0.08 $0.47 $0.44

Free Cash Flow per share† $/share $0.09 $0.04 $(0.04) $0.14 $0.04

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

2 Includes proceeds from the sale of the Blackwater project in the second quarter of 2024.

3 Attributable to the shareholders of the Company.

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Conference Call and Webcast:

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

November 7, 2024 at 10:00 am Eastern Time.

To register, please copy and paste the link into your browser: https://app.webinar.net/X9WPjZkrnl2

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:

Rebecca Henare, Director, Investor Relations

Tel: +1 604-678-4095

[email protected]

Media Relations:

Louise Burgess, Director, Communications

Tel: +1 604-403-2019

[email protected]

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 un der

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

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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.

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

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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.

Prior to the first quarter of 2024, Adjusted Net Profit/(Loss) 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 Adjusted Net Profit/(Loss) and Adjusted Earnings/(Loss)

per share:

$M, except per share amounts Q3 2024 Q2 2024 Q3 2023 YTD 2024 YTD 2023

Net profit (loss) 60.6 34.0 (5.5) 89.3 102.0

Foreign exchange (gain) loss (1.3) (0.1) 3.4 4.9 8.7

Write-down of assets 1.7 3.5 2.2 6.4 2.8

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

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

OGP listing costs 5.4 5.5 — 10.9 —

Restructuring costs — 0.4 — 1.9 —

Adjusted net profit 66.4 30.6 0.1 100.7 113.5

Adjusted weighted average number of common

shares - fully diluted 726.5 728.5 723.6 725.3 721.7

Adjusted earnings per share 0.09 0.04 0.00 0.14 0.16

EBITDA and Adjusted EBITDA

The Company’s 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, listing costs, foreign exchange gains/losses

and other non-recurring costs.

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.

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

$M Q3 2024 Q2 2024 Q3 2023 YTD 2024 YTD 2023

Net profit (loss) 60.6 34.0 (5.5) 89.3 102.0

Depreciation and amortization 86.0 69.9 51.7 220.7 157.0

Net interest expense and finance costs 4.3 6.5 4.4 16.2 14.7

Income tax expense on earnings 6.1 2.0 8.6 15.1 38.0

EBITDA 157.0 112.4 59.2 341.3 311.7

Write-down of assets 1.7 3.5 2.2 6.4 2.8

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

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

OGP listing costs 5.4 5.5 10.9

Restructuring expense — 0.4 — 1.9 —

Foreign exchange (gain) loss (1.3) (0.1) 3.4 4.9 8.7

Adjusted EBITDA 162.8 109.0 64.8 352.7 323.2

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.

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The following table provides a reconciliation of consolidated Cash Costs and AISC:

$M, except per oz amounts Q3 2024 Q2 2024 Q3 2023 YTD 2024 YTD 2023

Cost of sales, excl. depreciation and amortization 149.7 135.0 113.3 445.4 352.9

Indirect taxes 5.5 6.9 7.4 18.0 18.1

Selling costs 3.9 2.4 4.1 10.2 13.2

Other cash adjustments (0.3) (2.8) 2.5 (3.8) 5.9

By-product credits (35.6) (25.3) (28.9) (90.8) (94.4)

Total Cash Costs (net) 123.2 116.2 98.4 379.0 295.7

Sustaining capital and leases 80.7 73.5 73.9 211.0 205.3

Corporate general & administration 11.2 13.2 13.6 39.4 39.6

Onsite exploration and drilling 0.8 1.1 1.4 3.7 5.3

Total AISC 215.9 204.0 187.3 633.1 545.9

Gold sales (koz) 124.8 95.8 97.9 337.4 349.1

Cash Costs ($/oz) 987 1,213 1,003 1,123 847

AISC ($/oz)1 1,729 2,131 1,911 1,877 1,563

1 Excludes the Additional Government Share related to the FTAA at Didipio of $15.5 million, $(9.3) million and $15.5 million for the third quarter,

second quarter and year to date 2024, respectively, as it is considered in nature of an income tax.

The following tables provides a reconciliation of Cash Costs and AISC for each operation:

Haile

$M, except per oz amounts Q3 2024 Q2 2024 Q3 2023 YTD 2024 YTD 2023

Cash costs of sales 44.7 50.5 26.6 148.4 89.0

By-product credits (0.7) (0.8) (1.1) (2.2) (3.8)

Inventory adjustments (7.5) 4.0 (1.2) 8.5 (1.8)

Freight, treatment and refining charges 0.1 0.1 0.4 0.3 0.6

Total Cash Costs (net) 36.6 53.8 24.7 155.0 84.0

Sustaining and leases 15.7 7.9 13.5 32.6 42.3

Pre-strip and capitalized mining 29.9 18.4 32.7 56.5 78.3

Onsite exploration and drilling — — (0.1) — —

Total AISC 82.2 80.1 70.8 244.1 204.6

Gold sales (koz) 53.6 39.8 23.2 134.6 116.6

Cash Costs ($/oz) 683 1,351 1,063 1,152 720

AISC ($/oz) 1,537 2,008 3,047 1,814 1,755

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Didipio

$M, except per oz amounts Q3 2024 Q2 2024 Q3 2023 YTD 2024 YTD 2023

Cash costs of sales 36.0 35.5 33.0 107.6 95.0

By-product credits (33.5) (23.3) (26.9) (85.0) (87.7)

Royalties 2.1 1.6 1.3 5.1 4.7

Indirect taxes 5.7 4.8 7.4 16.1 18.1

Inventory adjustments 7.3 (5.4) 2.2 6.7 14.5

Freight, treatment and refining charges 6.2 3.3 5.4 13.4 17.0

Total Cash Costs (net) 23.8 16.5 22.4 63.9 61.6

Sustaining and leases 5.7 5.3 2.9 15.6 5.2

Pre-strip and capitalized mining 2.4 1.8 0.6 6.1 2.6

Onsite exploration and drilling — — (0.1) — 0.3

Total AISC 31.9 23.6 25.8 85.6 69.7

Gold sales (koz) 28.9 18.9 29.7 79.6 95.9

Cash Costs ($/oz) 824 874 754 803 642

AISC1 ($/oz) 1,103 1,250 872 1,075 727

1 Excludes the Additional Government Share of FTAA at Didipio of $15.5 million, $(9.3) million and $15.5 million for the third quarter, second

quarter, and year to date 2024, respectively, as it is considered in nature of an income tax.

Macraes

$M, except per oz amounts Q3 2024 Q2 2024 Q3 2023 YTD 2024 YTD 2023

Cash costs of sales 38.9 24.1 39.1 92.6 114.4

Less: by-product credits — (0.1) — (0.1) (0.1)

Royalties 0.2 2.3 0.4 2.4 2.4

Inventory adjustments 3.9 2.2 (5.5) 9.1 (13.1)

Freight, treatment and refining charges 0.1 0.2 0.2 0.5 0.6

Total Cash Costs (net) 43.1 28.7 34.2 104.5 104.2

Sustaining and leases 5.0 6.8 9.2 18.2 25.5

Pre-strip and capitalized mining 13.7 25.4 8.9 57.8 30.4

Onsite exploration and drilling 0.1 0.4 0.4 1.1 2.3

Total AISC 61.9 61.3 52.7 181.6 162.4

Gold sales (koz) 29.5 26.5 34.0 88.2 100.8

Cash Costs ($/oz) 1,458 1,085 1,004 1,185 1,034

AISC ($/oz) 2,099 2,319 1,550 2,060 1,611