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OGC.TO ·

1. OceanaGold sources the equivalent of 100% renewable energy, through the purchase of Renewable Energy Certificates (RECs).

Corporate Updates

1. OceanaGold sources the equivalent of 100% renewable energy, through the purchase of Renewable Energy

Certificates (RECs).

www.oceanagold.com 1

NEWS RELEASE

April 29, 2026

OceanaGold Releases 2025 Sustainability Report

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

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

is pleased to publish its annual Sustainability Report for the year ended December 31, 2025. The report

outlines OceanaGold’s sustainability performance and progress across safety, health, people and

culture, community and social performance, environment, tailings management, and climate.

Gerard Bond, President and Chief Executive Officer of OceanaGold, said “In 2025 we delivered another

year of meaningful progress across our sustainability priorities, while continuing to safely and responsibly

deliver gold production. Embedding sustainabil ity into how we operate is fundamental to creating and

protecting value for all stakeholders. Significant improvements in our safety performance, strong

community and economic contributions, and progress on decarbonization reflect the focus and

commitment of our teams across the business.”

2025 Sustainability Performance Highlights

• Maintained MSCI “AA” ESG rating for the third consecutive year

• No workplace fatalities or life ‑altering injuries during the year , and a 36% reduction in Total

Recordable Injury Frequency Rate compared to 2024

• Supported local economies and community development, spending $110M with nearly 800 local

suppliers while contributing $10M to community projects

• 38% reduction in GHG emissions 1 over the last 3 years , with a n aspiration of 30% absolute

reduction in Greenhouse Gas emissions by 2030

• Averaging 60% water re ‑used or recycled across operating mine sites , and an updated water

performance standard and site water management plans for all operating mine sites

The Company appointed David Bickerton as Executive Vice President and Chief Sustainability Officer

(CSO) effective April 1, 2026. David brings a deep understanding of OceanaGold’s business, culture and

Company objectives to this critical role. David joined OceanaGold in 2011 and has held a broad range of

roles across the business, most recently as Asset President of Didipio Mine in the Philippines.

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This year is the release of the Company’s first annual mandatory IFRS S2 Climate -related Disclosure,

which provides information about the Company’s approach and annual progress of climate-related

governance, strategy, risk management and metrics and targets.

Links to OceanaGold’s 2025 sustainability‑related reports

• 2025 Sustainability Report

• 2025 Climate‑related Disclosure (IFRS S2)

• 2025 Climate Transition Plan

• 2025 Sustainability Data Book

• 2025 Conflict‑Free Gold Statement

• 2025 Responsible Gold Mining Principles Conformance Report

www.oceanagold.com 3

About OceanaGold

OceanaGold is a g lobal 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:

Rebecca Henare, VP , Investor Relations

Tel: +1 604-678-4095

[email protected]

Valerie Burns, Manager, Investor Relations

Tel: +1 604-235-0742

[email protected]

Media Relations:

Louise Burgess, VP , Communications

Tel: +1 604-403-2019

[email protected]