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Oceanagold Achieves Full Year 2021 Guidance ON Record Annual Production from Haile

Production Results

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NEWS RELEASE

24 January 2022

OCEANAGOLD ACHIEVES FULL YEAR 2021 GUIDANCE ON RECORD ANNUAL

PRODUCTION FROM HAILE

(All financial figures are unaudited and denominated in US Dollars unless otherwise stated)

(BRISBANE) OceanaGold Corporation ( TSX: OGC) (ASX: OGC) (the “Company”) is pleased t o announce its

preliminary full year and fourth quarter 202 1 operational results for the year ended December 31, 2021. The

numbers contained in this document are unaudited and subject to finalisation. The Company will release its

complete 2021 audited financial and operational results after TSX market close on Wednesday February 23,

2022 (Toronto Eastern Standard Time).

Key Highlights

• Consolidated full year gold production increased 20% year-on-year with 362,807 ounces produced.

• Consolidated fourth quarter 2021 gold production of 106,591 ounces, a 35% increase quarter-on-quarter.

• Unaudited consolidated All-In Sustaining Costs (“AISC”) for the full year of $1,247 per ounce and cash

costs of $742 per ounce on gold sales of 381,562 ounces.

• Unaudited consolidated AISC for the fourth quarter of $1,326 per ounce on 105,336 ounces of gold sold.

• Haile exceeded full year production guidance with an annual record of 189,975 ounces of gold produced.

• Didipio exceeded full year production guidance with 14, 863 ounces of gold and 2,323 tonnes of copper

produced over only two months; ramp-up to full production tracking ahead of schedule.

• Cash balance increased to $133 million with total immediate available liquidity increasing to $163 million.

Scott Sullivan, Acting CEO of OceanaGold said, “We finished the year with a strong fourth quarter of production,

backed by solid operational performances from Haile , which delivered a record annual gold output and Didipio,

where ramp-up is advancing ahead of schedule. We are delivering on our commitments by achieving our full

year consolidated guidance and generating positive free cash flow for the first time in over two years.”

“OceanaGold is focused on delivering value to shareholders over the long term by consistently executing our

business plans and making prudent investment decisions geared to maximise the value of our operations .

Although we have made significant improvements to the business over the past several months, we have more

work ahead of us to implement additional changes and regain our st atus as one of the premier gold miners in

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the industry. I have full confidence that we will achieve this and regain our favoured market position over the

short, medium and long term.”

Table 1 – Fourth Quarter and Full Year 2021 Operational Results

Full Year 2021 Haile Didipio Waihi Macraes

Consolidated

2021 2020

Production, Sales & Costs

Gold Produced koz 190.0 14.9 27.7 130.3 362.8 301.7

Gold Sales koz 195.0 29.9 26.4 130.3 381.6 310.5

Average Gold Price US$/oz 1,801 1,809 1,776 1,864 1,821 1,597 (1)

Copper Produced kt - 2.3 - - 2.3 -

Copper Sales kt - 5.1 - - 5.1 -

Average Copper Price US$/lb - 4.39 - - 4.39 -

Cash Costs US$/oz 649 (116) 1,293 968 742 866

Site AISC (2) US$/oz 1,060 (25) 1,701 1,468 1,247 1,278

Operating Physicals

Material Mined kt 43,475 336 519 47,637 91,967 85,904

Waste Mined kt 40,261 7 230 42,729 83,227 75,296

Ore Mined kt 3,214 328 289 4,909 8,740 10,608

Mill Feed kt 3,146 594 292 5,263 9,294 9,067

Mill Feed Grade g/t 2.21 0.88 3.23 0.93 1.44 1.27

Gold Recovery % 84.2 87.0 91.1 81.9 83.3 81.4

Quarter ended 31 Dec 2021 Haile Didipio Waihi Macraes

Consolidated

Q4 2021 Q4 2020

Production, Sales & Costs

Gold Produced koz 42.5 14.9 11.9 37.4 106.6 99.2

Gold Sales koz 46.5 10.7 11.5 36.6 105.3 96.4

Average Gold Price US$/oz 1,787 1,928 1,791 1,799 1,806 1,726 (1)

Copper Produced kt - 2.3 - - 2.3 -

Copper Sales kt - 1.7 - - 1.7 -

Average Copper Price US$/lb - 4.74 - - 4.74 -

Cash Costs US$/oz 636 (236) 1,330 1,158 805 783

Site AISC (2) US$/oz 1,161 16 1,845 1,469 1,326 1,080

Operating Physicals

Material Mined kt 10,483 336 228 12,387 23,433 21,574

Waste Mined kt 9,776 7 113 10,862 20,759 17,770

Ore Mined kt 707 328 115 1,525 2,674 3,804

Mill Feed kt 843 594 119 1,528 3,084 2,374

Mill Feed Grade g/t 1.85 0.88 3.35 0.93 1.27 1.54

Gold Recovery % 82.7 87.0 92.6 81.6 83.4 84.1

(1) Realised gains and losses on gold hedging are included in the consolidated average gold price. Realised gains and losses on

gold hedging are not included in the site average gold prices.

(2) Site AISC are exclusive of Corporate general and administrative expe nses and have been restated in prior periods; accordingly,

Consolidated AISC is inclusive of Corporate general and administrative expenses.

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For the full year, OceanaGold achieved its consolidated production and cost guidance. On a consolidated basis,

the Company produced 362,807 ounces of gold and 2,323 tonnes of copper. Gold production was approximately

20% higher over 2020 due to significant year -on-year record gold output at Haile, the successful re -start and

continued ramp-up of operations at Didipio and ramp-up of Martha Underground at Waihi, which was partially

offset by lower head grades and mill feed from Macraes. Fourth quarter consolidated production was 106, 591

ounces of gold, an approximate 35% quarter-on-quarter increase on the back of a greater output from the New

Zealand operations and increasing production contribution from Didipio.

On a consolidated basis, the Company recorded an AISC of $1,247 per ounce on gold sales of 381,562 ounces

and copper sales of 5,104 tonnes. F ourth quarter consolidated AISC was $1,326 per ounce on gold sales of

105,336 ounces and copper sales of 1,748 tonnes . AISC was similar year -on-year with higher sales offset by

increased sustaining capital investments. The Company’s AISC increased 10% quarter -on-quarter on higher

cash costs and sustaining capital, which was partially offset by higher gold sales.

Haile Gold Mine – United States

For the full year, Haile produced an annual record of 189,975 ounces of gold, exceeding its full year production

guidance range of 175,000 to 180,000 ounces, a range that was lifted twice over the course of 2021. Haile’s

year-on-year production increased nearly 40% as a result of higher grades mined and processed as well as

operational and productivity improvements implemented throughout the year . Haile’s fourth quarter gold

production was 42,484 ounces, slightly lower than the previous quarter as guided however, the result exceeded

expectation due to continued mining and processing of higher grades. Full year AISC at Haile was $1,060 per

gold ounce sold, well below its full year AISC guidance range, while fourth quarter AISC was $1,161 per ounce

sold.

The Haile Technical Review is ongoing, and the Company now expects to release the preliminary results of the

study in the first quarter. The Company continues to expect the SEIS Final Record of Decision in the first quarter

and anticipates receipt of subsequent operating permits shortly thereafter. The permits are necessary to allow

underground mine development, expansion of the operating footprint to accommodate the build -out of future

waste storage facilities and increased water discharge rates. As previously guided, the ongoing delay in the

finalisation of the SEIS is impacting productivity at Haile , where mining rates are limited by additional material

and water re -handling, reducing output and increasing costs . Upon receipt of the necess ary permits, the

Company expects more efficient operations with fewer constraints and lower mining unit costs to be delivered

progressively over a two-year period.

Didipio Gold-Copper Mine – Philippines

At Didipio, following the restart of processing in early November, the operation produced 14,863 ounces of gold

and 2,323 tonnes of copper, exceeding the Company’s 2021 guidance range of 7,000 to 12,000 ounces of gold

and 1,000 tonnes of copper. Didipio’s by-product AISC for the year was negative $25 per ounce on sales of

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29,889 ounces of gold and 5,104 tonnes of copper. Fourth quarter AISC was $16 per ounce on gold sales of

10,738 ounces and copper sales of 1,748 tonnes. This included the sale of all remaining pre -existing copper-

gold concentrate inventory on hand . The r amp-up of oper ations to full production rates is advancing ahead of

schedule.

Macraes Gold Mine – New Zealand

At Macraes, the operation produced 130,287 ounces of gold for the full year , including 37,385 ounces in the

fourth quarter. Although the full year result is below the lower end of guidance, the quarter-on-quarter production

increased 45% on the back of a higher head grade and increased mill feed. Full year production was impacted

by inclement weather early in 2021 resulting in delayed access to higher grade zones, mill disruptions related to

mill motor failures, geotechnical challenges at Coronation North and COVID -19 restrictions in the second and

third quarters. In the fourth quarter, the operation delivered first production from Golden Point Underground as

expected.

Full year AISC was $1,468 per ounce on 130,305 ounces of gold sold while fourth quarter AISC was $1,469 per

ounce on gold sales of 36,615 ounces. The Company expects Macraes to deliver a stronger operational result

in 2022 consistent with operational improvements implemented in the second half of 2021 and the continued

ramp-up of the Golden Point Underground mine.

Waihi Gold Mine – New Zealand

The Waihi operation produced 27,682 ounces of gold for the full year , including 11,859 ounces in the fourth

quarter, which was 57% higher than the previous quarter. The production increase was attributed to the continued

ramp-up of mining rates from the Martha Underground leading to higher mill feed where continuous processing

commenced at the end of the second quarter. Production was impacted by various local and regional COVID-19

restrictions and isolation requirements following the lifting of the Go vernment mandated lockdowns and from

negative reconciliation, which was previously flagged. The Company continues to increase drilling to assist mine

planning efforts and does not expect long-term impacts related to the resource model.

For the full year, Waihi’s AISC was $1,701 per ounce on gold sales of 26,373 ounces, while fourth quarter AISC

was $ 1,845 per ounce on 11,517 ounces of gold sold. Looking ahead to 2022, the Company expect s the

continued ramp-up of operations at the Martha Underground , with a significant increase to gold production and

decrease in costs.

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2021 Full Year Results Webcast

The Company will host its 2021 Full Year Results Webcast at 5:30pm on Wednesday February 2 3, 2022

(Toronto, Eastern Standard Time) / 9:30am on Thursday February 24, 2022 (Melbourne, Eastern Daylight Time).

Webcast Participants

To register, please copy and paste the link below into your browser:

https://produceredition.webcasts.com/starthere.jsp?ei=1521715&tp_key=751b08e415

Teleconference Participants (required for those who wish to ask questions)

Local (toll free) dial in numbers are:

Canada & North America: 1 888 390 0546

Australia: 1 800 076 068

New Zealand: 0 800 453 421

United Kingdom: 0 800 652 2435

Switzerland: 0 800 312 635

Germany: 0 800 724 0293

All other countries (toll): + 1 416 764 8688

If you are unable to attend the call, a recording will be available for viewing on the Company’s website.

- ENDS -

Authorised for release to market by OceanaGold Corporate Company Secretary, Liang Tang.

For further information please contact:

Investor Relations Media Relations

Sabina Srubiski

Tel: +1 604 351 7909

[email protected]

Melissa Bowerman

Tel: +61 407 783 270

[email protected]

www.oceanagold.com | Twitter: @OceanaGold

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About OceanaGold

OceanaGold is a multinational gold producer committed to the highest standards of technical, environmental,

and social performance. For 30 years, we have been contributing to excellence in our industry by delivering

sustainable environmental and social outcomes for our communities, and strong returns for our shareholders.

Our global exploration, development, and operating experience has created a significant pipeline of organic

growth opportunities and a portfolio of established operating assets including Didipio Mine in the Philippines;

Macraes and Waihi operations in New Zealand; and Haile Gold Mine in the Unite d States of America.

Cautionary Statement for Public Release

Certain information contained in this public release may be deemed “forward -looking” within the meaning of

applicable securities laws. Forward-looking statements and information relate to future performance and reflect

the Company’s expectations regarding the generation of free cash flow, achievement of guidance, execution of

business strategy, future growth, future production, estimated costs, results of operations, business prospects

and opportunities of OceanaGold Corporation and its related subsidiaries. Any statements that express or involve

discussions with respect to predictions, expectations, beliefs, plans, projections, objectives, assumptions or

future events or performance (often, but n ot always, using words or phrases such as "expects" or "does not

expect", "is expected", "anticipates" or "does not anticipate", "plans", "estimates" or "intends", or stating that

certain actions, events or results "may", "could", "would", "might" or "will" be taken, occur or be achieved) are not

statements of historical fact and may be forward-looking statements. Forward-looking statements are subject to

a variety of risks and uncertainties which could cause actual events or results to differ materially fr om those

expressed in the forward -looking statements and information. They include, among others, the outbreak of an

infectious disease, the accuracy of mineral reserve and resource estimates and related assumptions, inherent

operating risks and those risk factors identified in the Company’s most recent Annual Information Form prepared

and filed with securities regulators which is available on SEDAR at www.sedar.com under the Company’s name.

There are no assurances the Company can fulfil forward -looking sta tements and information. Such forward -

looking statements and information are only predictions based on current information available to management

as of the date that such predictions are made; actual events or results may differ materially as a result of risks

facing the Company, some of which are beyond the Company's control. Although the Company believes that any

forward-looking statements and information contained in this press release is based on reasonable assumptions,

readers cannot be assured that actual outcomes or results will be consistent with such statements. Accordingly,

readers should not place undue reliance on forward-looking statements and information. The Company expressly

disclaims any intention or obligation to update or revise any forward-looking statements and information, whether

as a result of new information, events or otherwise, except as required by applicable securities laws. The

information contained in this release is not investment or financial product advice.

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TO US NEWSWIRE SERVICES.