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OceanaGold Reports First Quarter 2024 Operating and Financial Results

Financials

April 30, 2024 NEWS RELEASE

OceanaGold Reports First 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 months ended March 31, 2024 .

The condensed interim consolidated financial statements and Management's Discussion and Analysis

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

Gerard Bond, President and CEO of OceanaGold, said "2024 is expected to be a strong production

growth and Free Cash Flow † delivery year for OceanaGold and our first quarter results are in-line with

expectations. As outlined in our Guidance in February, we expect to see gold production increase each

quarter throughout the year with stronger second half performance at all four of our operating sites."

At Haile, the Horseshoe underground is ramping up on schedule with full mining rates expected to be

achieved by mid-year, at the same time as we begin to access a higher proportion of open pit ore from

Ledbetter pit, which positions Haile for a very strong second half. Similarly at Macraes, we have been

stripping Innes Mills 7 to unlock the next phase of open pit ore, which we expect to be delivered to the mill

in the second half of the year. At Didipio, the mining sequence had us in the lower grade areas of the

underground during the quarter, and we expect to access higher grades by mid-year in line with plan.

The Company delivered exciting exploration results across our portfolio, including the first underground

drilling into Horseshoe Extension at Haile, high grade results at the growing Wharekirauponga deposit in

New Zealand, and we announced the start of a brand new exploration program at our regional Napartan

target at Didipio.

The balance sheet remains strong and we plan to apply the proceeds expected from the OceanaGold

Philippines Inc. listing on the Philippines Stock Exchange this quarter to the repayment of debt.

Mr Bond said, "Progressively stronger production in each remaining quarter of this year, and with strong

gold and copper prices, we expect to be in a position to further strengthen the balance sheet, invest in our

organic growth and consider additional returns to shareholders."

† See “Non-IFRS Financial Information” in the MD&A.

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Highlights

• On-track to meet full-year 2024 consolidated production, cost and capital guidance.

• 12MMA Total Recordable Injury Frequency Rate (“TRIFR”) has remained steady at 1.0 per 200,000

hours worked at March 31, 2024.

• Produced 104,800 ounces of gold and 3,000 tonnes of copper in the first quarter.

• All-In Sustaining Cost (“AISC”)† of $1,823 per ounce for the first quarter.

• Gold sales of 116,800 ounces for Q1, which includes 12,000 ounces of 2023 production.

• Revenue of $270.3 million, driven by record average realized gold price of $2,092 per ounce.

• Ended the quarter with Net Debt † of $81.8 million (excludes finance leases) at a Leverage

Ratio† of 0.21x.

• Released updated Mineral Reserves and Mineral Resources , including Indicated Resource

growth to 1 million ounces of gold (2.0 million tonnes at 15.9 g/t) at Wharekirauponga and initial

Mineral Reserves of 380,000 ounces (4.0 million tonnes at 2.9 g/t) at Palomino at Haile.

• Released updated technical report for Haile which, based on Mineral Reserves only, is expected

to produce 2.3 million ounces of gold over a 12-year mine life at average gold production of

192,000 ounces per year with a life of mine average AISC† of $1,200 per ounce.

• Received regulatory approvals and permit to sell for the Initial Public Offering of 20% of

OceanaGold Philippines Inc., which holds Didipio . Listing is expected to be completed on May

13, with proceeds applied to reduce OceanaGold’s bank debt, further strengthening the balance

sheet.

• Announced the sale of the Blackwater Project in New Zealand for $30 million in cash, with closing

subject to regulatory approval.

• Semi-annual dividend of $0.01 per share was paid on April 26, 2024.

† See “Non-IFRS Financial Information” in the MD&A.

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Table 1 – Production and Cost Results Summary

Quarter ended

March 31, 2024 Haile Didipio Waihi Macraes Consolidated

Q1 2024 Q4 2023 Q1 2023

Production, Sales & Costs

Gold Produced koz 34.7 26.3 11.4 32.3 104.8 129.8 118.1

Gold Sales koz 41.2 31.8 11.6 32.2 116.8 118.8 112.0

Average Gold Price $/oz 2,092 2,136 2,096 2,046 2,092 1,993 1,919

Copper Produced kt — 3.0 — — 3.0 3.8 3.5

Copper Sales kt — 3.2 — — 3.2 3.9 3.3

Average Copper Price1 $/lb — 3.90 — — 3.90 3.80 4.29

Cash Costs† $/oz 1,569 742 1,601 1,016 1,194 987 861

AISC†2 $/oz 1,987 946 2,393 1,814 1,823 1,658 1,567

Operating Physicals

Material Mined kt 5,425 454 244 12,820 18,943 20,785 22,816

Waste Mined kt 5,314 39 113 11,981 17,447 18,158 19,615

Ore Mined kt 110 415 131 839 1,495 2,627 3,202

Mill Feed kt 813 942 132 1,665 3,552 3,671 3,095

Mill Feed Grade g/t 1.76 0.98 2.96 0.73 1.12 1.27 1.39

Gold Recovery % 75.3 88.6 91.4 82.1 82.1 86.5 84.8

Capital Expenditures3

Sustaining $M 7.8 4.6 2.5 5.6 20.5 22.2 20.7

Pre-strip & Capitalized Mining $M 8.2 1.9 5.5 18.7 34.3 41.6 42.0

Growth $M 9.0 1.9 1.6 0.7 13.2 13.0 16.1

Exploration $M 1.8 0.4 3.3 0.6 6.1 7.2 4.3

Total Capital Expenditures $M 26.8 8.8 12.9 25.6 74.1 84.0 83.1

1 The Average Copper Price Received calculated includes mark-to-market revaluations on unfinalized shipments as well as final adjustments on

prior period shipments per accounting requirements

2 AISC is exclusive of corporate G&A expenses but include share based remuneration paid to eligible site employees, Consolidated AISC is

inclusive of corporate G&A expenses which includes share based remuneration paid to eligible non-operations corporate employees. Cash

Costs and AISC are reported on ounces sold and net of by-product credit basis.

3 Capital and exploration expenditure by location includes related regional greenfield exploration where applicable. Corporate capital projects not

related to a specific operating region totaled $0.6 million in Q1 2024 and $0.2 million Q4 2023.

Table 2 – Financial Summary

Q1 2024 Q4 2023 Q1 2023

Revenue $M 270.3 267.3 243.9

Cash Costs† $/oz 1,194 987 861

AISC† $/oz 1,823 1,658 1,567

Adjusted EBITDA† $M 80.9 91.6 102.1

Adjusted net profit† $M 3.7 6.6 41.0

Net (loss) profit $M (5.3) (18.9) 38.9

(Loss) earnings per share $/share $(0.01) $(0.03) $0.06

Adjusted earnings per share† $/share $0.01 $0.01 $0.06

† See “Non-IFRS Financial Information” in the MD&A.

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Table 3 - Cash flow Summary

$M, except per share amounts Q1 2024 Q4 2023 Q1 2023

Cash flows from Operating Activities 75.3 94.8 65.2

Cash flows used in Investing Activities (73.5) (78.7) (81.6)

Cash flows from (used in) Financing Activities 19.2 (13.9) (6.6)

Free Cash Flows† 1.8 16.1 (16.4)

Operating Cash Flow per share† $0.11 $0.12 $0.14

Operations

The Company produced 104,800 ounces of gold and 3,000 tonnes of copper in the first quarter of 2024.

First quarter gold production was 19% lower than the previous quarter and 11% lower than the

corresponding quarter in 2023. The decrease compared to the previous quarter was largely driven by

expected lower mill feed grade at Didipio (previous quarter included more high grade stope ore) and a

planned 5-day process plant shutdown, Waihi (localized geotechnical constraints limiting access to high

grade stopes) and Macraes (planned utilization of low grade stockpile feed), partially off-set by higher

grade underground ore feed at Haile. The decrease compared to the corresponding quarter in 2023 was

largely driven by lower grade at Haile (compared with access to higher grade open pit ore in the first

quarter of 2023), lower grade at all other operations, partially off-set by higher mill throughput at both

Macraes and Waihi.

Gold sales in the first quarter of 2024 are consistent with the previous quarter and the corresponding

quarter in 2023, due to the reduction of inventory and timing of sales at Haile and Didipio.

Financial

Revenue

The Company recorded first quarter consolidated revenue of $270.3 million, a 1% increase compared to

the previous quarter despite a 2% decrease in gold sales volumes, largely due to the 5% increase in the

average realized gold price.

First quarter revenue was 11% above the corresponding period in 2023, reflecting higher gold sold at

Macraes, combined with a 9% higher average realized gold price, partly offset by lower gold sales

volumes from Didipio in line with the mine plan.

AISC†

The Company recorded a first quarter AISC† of $1,823 per ounce on gold sales of 116,800 ounces. This

was a 10% increase in AISC † compared to the previous quarter and a 16% increase compared to the

corresponding period in 2023. The quarter-on-quarter increase in the first quarter AISC† is due to higher

unit costs at all operations except for Haile, where AISC † decreased due to higher gold sales than

production (release of inventory) and higher grades from Horseshoe Underground. The cost increases at

† See “Non-IFRS Financial Information” in the MD&A.

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Didipio were due to lower sales volumes in line with the mine plan, while lower grades mined and

processed resulted in lower sales volumes at Macraes and Waihi.

Adjusted EBITDA†

First quarter Adjusted EBITDA† was $80.9 million, a 12% decrease relative to the previous quarter mainly

due to the higher costs of sales at Haile due to more rehandled tonnes moved to expose the Ledbetter

Phase 3 footprint.

First quarter Adjusted EBITDA † was 21% lower than the corresponding quarter in 2023 as higher

revenues were offset by higher cost of sales across the operations and accrual of the Additional

Government Share at Didipio, along with higher foreign exchange losses compared with other income in

2023.

Net profit (loss)

The first quarter unadjusted net loss of $5.3 million or $(0.01) per share fully diluted, was lower than the

unadjusted net loss of $18.9 million and $(0.03) per share fully diluted in the previous quarter. The

$13.6 million decrease in net loss was primarily driven by the previous quarter non-cash write-down of

indirect tax receivables in the Philippines totaling $38.3 million and the increase in the average gold price

in the first quarter, partially offset by an increase in operating costs (refer to AISC† section above).

First quarter of 2024 unadjusted net loss represents a decrease in profitability of $44.2 million or 114%

from the corresponding quarter in 2023 primarily due to a 16% increase in AISC†, a $19.7 million increase

in depreciation and amortization (due to processing more lower grade stockpile material which has higher

depreciation and amortization per contained gold ounce) and the Additional Government Share of

$9.3 million at Didipio, partially offset by the increase in the average gold price.

Conference Call

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

May 1st, 2024 at 10:00 am Eastern Time.

Webcast Details:

To register, please copy and paste the link into your browser: https://app.webinar.net/ejwKB7YEJy6

Conference Call Details:

Toll-free North America: +1 888-390-0546

International: +1 416-764-8688

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

† See “Non-IFRS Financial Information” in the MD&A.

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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 Harris, Director, Investor Relations

Tel: +1 604-678-4095

[email protected]

Media Relations:

Louise Burgess, Director, 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.

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

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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.

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