Oceanagold CorporationTSX: OGC

2025 Conflict-Free Gold Statement

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Conflict-Free Gold Statement



2025



Acknowledgement

OceanaGold recognizes the unique rights and interests of the Indigenous People and communities where we operate and the importance of maintaining their cultural values and heritage as described in the United Nations Declaration on the Rights of Indigenous Peoples. We conduct our business activities consistent with the principles of Free Prior and Informed Consent with effective and open engagement to enable informed decision making and due consideration of Indigenous People and community interests in our business activities.

About this report Reporting boundary and scope

OceanaGold Corporation's 2025 Conflict-Free Gold Statement (this report) has been prepared for the Company and its subsidiaries (together referred to as "the Group"). Unless otherwise stated, references to "OceanaGold", "OGC", "the Company", "the Group", "we" and "our" in this report refer to OceanaGold Corporation and its subsidiaries.

This report summarizes how OceanaGold conformed with the requirements of the World Gold Council's (WGC) Conflict-Free Gold Standard ("CFGS" or the "Standard") from January 1, 2025 to December 31, 2025.

Organizational boundary

For the purposes of this report, OceanaGold's organizational boundary includes the mining operations we own and control and our main corporate and administrative offices, during the reporting period.

OceanaGold's operating assets:

  • Haile Gold Mine, our wholly owned open pit and underground operation located near Kershaw, South Carolina, United States ("Haile" or "Haile Gold Mine")

  • Macraes Operation, our wholly owned open pit and underground operation located on the South Island, New Zealand ("Macraes" or the "Macraes Operation")

  • Waihi Operation, our wholly owned underground operation which includes the Waihi North Project, located in the North Island, New Zealand ("Waihi" or the "Waihi Operation")

  • Didipio Mine, our 80%-owned underground gold and copper mine and surface stockpile operation located in Luzon, Philippines ("Didipio" or "Didipio Mine")

    OceanaGold's corporate and administrative offices:

  • Vancouver, British Columbia, Canada (head office)

  • Brisbane, Queensland, Australia

  • Melbourne, Victoria, Australia

  • Manila, Philippines

  • Dunedin, New Zealand

  • Singapore

    Unless otherwise stated, for the purpose of this report exploration properties held through earn-in and partnership agreements with third parties have been excluded from the organizational boundary.

    Cautionary statement for public release

    This report may contain statements that reflect the current beliefs and expectations of the Company about the future plans and results of the Company as of the respective dates indicated. These forward-looking statements are based

    on a number of assumptions about the operations of the Company and factors beyond the control of the Company and are subject to significant risks and uncertainties, and, accordingly, actual results may differ materially from

    these forward-looking statements contained in this report regarding past trends or activities should not be taken as a representation that such trends or activities will continue in the future. There is no obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise. You should not place undue reliance on forward-looking statements, which speak only as of the date of this report. The Company and its advisors have no obligation and do not undertake to revise

    forward-looking statements contained in this report to reflect future events or circumstances.

    This report does not contain all material information concerning the Company or its securities, particularly with respect to the risks and special considerations involved with an investment in any securities of the Company, and the information set forth in this report is subject to change without notice. Certain data in this report was obtained from various external data sources, and the Company

    has not verified such data with independent sources. The Company is under no obligation to update or keep current the information contained herein.

    The information contained in this report has been taken from sources deemed reliable by the Company. However, no representation or warranty (whether express or implied) is made as to the fairness, accuracy, completeness, or correctness of, and no reliance should be placed on,

    such information or opinions contained herein. None of the Company, any of its advisors or any of its affiliates or any of its directors, officers, employees, advisers, or representatives shall have any liability whatsoever (for

    negligence or misrepresentation or in tort or under contract or otherwise) for any loss howsoever arising from any use of information presented in this report or otherwise arising in connection with this report.

    Feedback

    We invite feedback on this report or any aspect of our sustainability performance via sustainability@oceanagold.com.

    For enquiries, please visit the "Contact Us" section of our website at oceanagold.com

    Front cover image: Gold dore being prepared at in our Haile Gold Mine gold room

    OceanaGold 2025 Conflict-Free Gold Statement 2

    Our business

    OceanaGold Corporation is a global gold and copper producer head-quartered in Vancouver, Canada.

    OceanaGold is a growing gold and copper producer with four producing mines. Our head office is in Vancouver (Canada), and we have support offices in Brisbane and Melbourne (Australia), Manila (Philippines), Singapore and Dunedin (New Zealand).

    Didipio Mine

    Luzon Island, Philippines

    Waihi Operation

    North Island, New Zealand

    Macraes Operation

    South Island, New Zealand



    OceanaGold Head Office

    Vancouver, Canada

    Haile Gold Mine

    South Carolina, U.S.A



    OceanaGold 2025 Conflict-Free Gold Statement 3

    Overview Our Purpose is mining gold for a better future. We care about the impact of our operations and follow safe and responsible practices as well as continuously improve how we operate and minimize our impacts. Our Vision is to be a company people trust, want to work and partner with, supply and invest in, to create value. We are focused on keeping our people safe, managing our impacts, benefitting and creating opportunities for host communities.

    We have a diversified portfolio of four operating mines: the Haile Gold Mine in the U.S.A.; Macraes Mine and Waihi Mine in New Zealand; and the Didipio Mine in the Philippines.

    Our operations are supported by a global workforce of approximately 5,400 employees and contractors, with extensive experience in exploration, development and operations.

    Our mines produce gold doré bars (containing both gold and silver). At our Didipio Mine in the Philippines, we also produce copper-gold in concentrate. Our gold doré is refined and cast into bars that meet the London Bullion Market Association Good Delivery Standard. Our gold is then sold to refineries

    or financial institutions, including the central bank of the Philippines.

    We use traceability systems to map the flow of gold and gold bearing material from point of origin to point of dispatch. Our reference systems allow us to uniquely identify each batch of gold that leaves the mine's area of control. Reference

    numbers are imprinted in such a way that makes tampering or removal evident.

    Confiict-Free Gold Standard Requirements

    Complying with the five-part Standard requires an annual review of up to four assessments (Part A to Part D of the Standard), assessing the conformance of a company's operating assets under the control of, or managed by,

    the company over a 12-month period, and a Management Statement of Conformance (Part E):

  • Part A - Conflict Assessment

  • Part B - Company Assessment

  • Part C - Commodity Assessment

  • Part D - External Sources of Gold Assessment

  • Part E - Management Statement of Conformance

Part A of the Standard requires a company to assess whether gold mining or its onward transport breaches international sanctions, and assess whether any mine inside the reporting boundary is located in a "conflict-affected or high-risk" area, as determined by the Heidelberg Institute for International Conflict Research Conflict Barometer (the "Heidelberg Conflict Barometer" or "Barometer")

Under the Standard's criteria, any operation located in an area ranked as 5 (war) or 4 (limited war) in the Heidelberg Conflict Barometer either in the current year or within the past two years is classified as "conflict-affected or high risk". Such operations are required to complete the full set

of assessments outlined in Parts B through E of the Standard.

For operations assessed and determined not to be located in conflict-affected or high-risk areas, and where gold is not transported while under the custody of the producer, only Parts D and E of the Standard are required to be completed.

Oceanagold's Evaluation Part A - Confiict Assessment

We have conducted a review of the International Sanction lists maintained by both the United Nations Security Council and the European Union international sanctions to determine whether any sanctions have been imposed on countries contained within our reporting boundary.

We also conducted a risk assessment to assess determine whether any of our operating mines inside the reporting boundary are located in a "conflict-affected or high-risk" area, as determined by the 2024 Heidelberg Conflict Barometer ranking of 5 (war) or 4 (limited war).

Based on these reviews, we have concluded that, during 2025:

  1. The International Sanctions lists showed "NO" relevant sanctions targeting the Philippines, New Zealand and US, or sectors relevant to their gold mining.

  2. None of the regions where we operate - nor those where our products are transported - were considered conflict-affected or high-risk in the past two Conflict Barometer reports.

    Any third-party suppliers engaged to transport our gold are required to complete a due diligence process that screens for sanctions exposure and requires suppliers to identify any potential conflicts of interests that require further risk analysis . Additionally, suppliers are required to comply with the company's Supplier Code of Conduct.

    OceanaGold's Human Rights Policy can be viewed on our company website.

    Part B - Company Assessment and Part C - Commodity Assessment

    Based on the requirements of the Standard, and our determination that our gold mining or its onward transportation does not breach International Sanctions, and that our operating mines are outside any "conflict affected" or "high-risk" areas as described by the Barometer, we are not required to assess against Parts B and C of the Standard.

    1. The most current published version of the Heidelberg Institute for International Conflict Research Conflict Barometer available at the time of assessment, released 19 December 2025.





      Our Haile Gold Mine environment team completing a field survey, U.S.A

      Part D - Externally Sourced Gold Assessment

      We confirm that OceanaGold operations do not source gold from external suppliers.

      Part E - Management Statement of Conformance

      OceanaGold confirms that, to the best of our knowledge, the gold and gold-bearing material produced by our mines does not in any way contribute to armed conflict, human rights abuses, or breaches of international humanitarian law.

      We believe that all our mining operations have the appropriate governance, systems, and controls in place to conform with the World Gold Council's Conflict-Free Gold Standard.

      This Statement of Conformance is part of the conformance requirements for the WGC's Conflict-Free Gold Standard. We also provide it as good faith representation to the next participants in the chain of custody of our products.

      Independent Assurance

      In 2025, PricewaterhouseCoopers (PwC) evaluated of our ongoing compliance with the World Gold Council's Conflict-Free Gold Standard for the 2025 reporting period. PwC has independently assured both OceanaGold's conformance assessment and management statement of conformance for this reporting cycle. PwC's Independent Limited Assurance Opinion is available in Appendix A.

      Appendix A - Placeholder PwC's Assurance Opinion Statement

      To: Directors of OceanaGold Corporation

      Independent assurance report on identified Subject Matter Information in OceanaGold Corporation's 2025 Conflict-Free Gold Statement Scope

      In accordance with the terms of engagement letter dated 5 September 2025 and its subsequent addendum dated 27 October 2025, we were engaged by OceanaGold Corporation ("OceanaGold") to perform an independent limited assurance engagement in respect of the identified Subject Matter Information (the "Subject Matter Information") for OceanaGold for the period ended 31 December 2025 (the "Period"). The criteria (the "Criteria") against which we assessed the Subject Matter Information is as follows:

      Subject Matter Information

      Criteria

      OceanaGold's assertion, made on pages 4-5 within its 2025 Conflict-Free Gold Statement, of its conformance with the Conflict-Free Gold Standard developed by the World Gold Council

      World Gold Council's Conflict-Free Gold Standard

      Responsible party's responsibilities

      The Responsible Party is responsible for the Subject Matter Information and for the preparation of the Subject Matter Information in accordance with the Criteria.

      Our Independence and quality management

      We have complied with the ethical requirements of the International Ethics Standard Board for Accountants' (IESBA) International Code of Ethics for Professional Accountants (including International Independence Standards) (IESBA Code) issued by the International Ethics Standards

      PricewaterhouseCoopers, ABN 52 780 433 757

    2. Riverside Quay, SOUTHBANK VIC 3006,

GPO Box 1331 MELBOURNE VIC 3001

T: +61 3 8603 1000, F: +61 3 8603 1999, https://www.pwc.com.au

pwc.com.au

Liability limited by a scheme approved under Professional Standards Legislation.



Appendix A - Placeholder PwC's Assurance Opinion Statement continued

Board for Accountants relevant to assurance engagements, which are founded on fundamental principles of integrity, objectivity, professional competence and due care, confidentiality and professional behaviour.

Our firm applies International Standard on Quality Management ISQM 1, Quality Management for Firms that Perform Audits or Reviews of Financial Statements, or Other Assurance or Related Services Engagements, which requires the firm to design, implement and operate a system of quality management including policies or procedures regarding compliance with ethical requirements, professional standards and applicable legal and regulatory requirements.

Our responsibilities

Our responsibility is to express a limited assurance conclusion based on the procedures we have performed and the evidence we have obtained.

Our engagement has been conducted in accordance with the International Standard on Assurance Engagements (ISAE) Revised Assurance Engagements Other Than Audits or Reviews of Historical Financial Information (ISAE 3000R). Those standards require that we plan and perform this engagement to obtain limited assurance about whether anything has come to our attention to indicate that the Subject Matter Information has not been prepared, in all material respects, in accordance with the Criteria, for the Period. The procedures we performed were based on our professional judgement and included:

  • made inquiries of the persons responsible for the Subject Matter Information;

  • obtained an understanding of the process for collecting and reporting the Subject Matter Information;

  • obtained and evaluated a selection of information supporting OceanaGold's assertion regarding its conformance with the Conflict-Free Gold Standard; and

  • considered the disclosure and presentation of the Subject Matter Information.

The procedures performed in a limited assurance engagement vary in nature and timing from, and are less in extent than for, a reasonable assurance engagement and consequently the level of assurance obtained in a limited assurance engagement is substantially lower than the assurance that would have been obtained had a reasonable assurance engagement been performed. Accordingly, we do not express a reasonable assurance opinion.

We believe that the evidence we have obtained is sufficient and appropriate to provide a basis for our conclusion.

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Appendix A - Placeholder PwC's Assurance Opinion Statement continued

Use of report

This report was prepared for the Directors of OceanaGold for the purpose of providing limited assurance on the Subject Matter Information, using criteria designed for this purpose. We disclaim any assumption of responsibility for any reliance on this report to any persons or users other than the Directors of OceanaGold, or for any purpose other than that for which it was prepared.

Inherent limitations

Because of the inherent limitations of any unavoidable risk that work planned and executed during our engagement may not detect a fraud, error or non-compliance with laws and regulations, particularly where there has been concealment through collusion, forgery and other illegal acts, it is possible that fraud, error or non-compliance may occur and not be detected. A limited assurance engagement is not designed to detect all instances of non-compliance of the Subject Matter Information with the Criteria, as it is limited primarily to making enquiries, of the responsible party, and applying analytical procedures.

Additionally, non-financial data may be subject to more inherent limitations than financial data, given both its nature and the methods used for determining, calculating and estimating such data. The precision of different measurement techniques may also vary. The absence of a significant body of established practice on which to draw to evaluate and measure non-financial information allows for different, but acceptable, evaluation and measurement techniques that can affect comparability between entities and over time.

The limited assurance conclusion expressed in this report has been formed on the above basis.

Conclusion

Based on the procedures performed and evidence obtained, nothing has come to our attention that causes us to believe that the Subject Matter Information has not been prepared, in all material respects, in accordance with the Criteria for the period ended 31 December 2025.

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Appendix A - Placeholder PwC's Assurance Opinion Statement continued

PricewaterhouseCoopers

Scott Thompson Melbourne

Partner 28 April 2026

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OceanaGold Corporation

Suite 1020 - 400 Burrard Street Vancouver, British Columbia V6C 3A6

Canada

+1 604 678 4123

For further information: sustainability@oceanagold.com

oceanagold.com

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