UNCLASSIFIED - NON CLASSIFIÉ#

Extractive Sector Transparency Measures Act - Annual Report
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Reporting Entity Name
OceanaGold Corporation
Reporting Year
From1/01/25
To:
12/31/25
Date submitted
6/01/26
Reporting Entity ESTMA Identification Number

E840887
☒ Original Submission
☐ Amended Report
Other Subsidiaries Included
(optional field)
Not Consolidated

Not Substituted
Attestation by Reporting Entity

In accordance with the requirements of the ESTMA, and in particular section 9 thereof, I attest I have reviewed the information contained in the ESTMA report for the entity(ies) listed above. Based on my knowledge, and having exercised reasonable diligence, the information in the ESTMA report is true, accurate and complete in all material respects for the purposes of the Act, for the reporting year listed above.
Full Name of Director or Officer of Reporting Entity
Marius van Niekerk

Date

6/01/26
Position Title
Chief Financial Officer and Executive Vice President



UNCLASSIFIED - NON CLASSIFIÉ

Extractive Sector Transparency Measures Act - Annual Report
Reporting Year
From:
1/01/25
To:
12/31/25
Reporting Entity Name
OceanaGold Corporation
Currency of the Report
USD
Reporting Entity ESTMA
Identification Number
E840887
Subsidiary Reporting
Entities (if necessary)
Payments by Payee

Country

Payee Name1
Departments, Agency, etc…
within Payee that Received
Payments2

Taxes

Royalties

Fees

Production Entitlements

Bonuses

Dividends
Infrastructure Improvement Payments
Total Amount paid to Payee

Notes34
New Zealand
Government of New Zealand
Inland Revenue
40,692,000
40,692,000
Income tax paid
New Zealand
Government of New Zealand
Ministry of Business, Innovation
and Employment
6,533,000
278,000
6,811,000
Royalties paid on gold and silver sales. Fees paid for Mining and
Exploration Permits/Licenses.
New Zealand
Government of New Zealand
Hauraki District Council
470,000
470,000
Local Government Rates
New Zealand
Government of New Zealand
Waitaki District Council
431,000
431,000
Local Government Rates
New Zealand
Government of New Zealand
Energy Efficiency and
Conservation Authority
374,000
374,000
Electricity authority levy
New Zealand
Government of New Zealand
Otago Regional Council
299,000
299,000
Local Government Rates
New Zealand
Government of New Zealand
Waikato Regional Council
244,000
244,000
Local Government Rates
New Zealand
Government of New Zealand
Land Transport Safety Authority
194,000
194,000
Road user charges and licenses for light vehicles
New Zealand
Government of New Zealand
Fire and Emergency New
Zealand Board
124,000
124,000
Fire service levy
New Zealand
Government of New Zealand
New Zealand Customs Service
117,000
117,000
Customs levies
Philippines
Government of the Philippines
Bureau of Internal Revenue
59,797,000
59,797,000
Corporate income tax and excise tax on minerals

Philippines

Government of the Philippines

Mines and Geosciences Bureau

8,217,000

39,000

8,256,000
Additional Government Share payment (related to the year ended December 31, 2024)
Processing Fee (Permits)
Philippines
Local Government Unit
6,841,000
14,000
6,855,000
Local Business Tax, processing fee (Permits)
Philippines
Provincial Government of Nueva Vizcaya
3,336,000
3,336,000
Community Development Program (CDF)

Philippines

Municipalities of Cabarroguis and Kasibu

Local barangays

3,318,000

3,318,000
Social Development Management Program, Information/Education/Communication, Development of Mining
Technology and Geo-sciences
Philippines
Provincial Government of Quirino
3,180,000
3,180,000
Quirino Provincial Development Fund
Philippines
Provincial Government of Quirino
1,697,000
1,697,000
Environmental funds
Philippines
Government of the Philippines
Bureau of Customs
1,367,000
1,367,000
Customs duties and tariff fees
Philippines
Local Government Unit Province of
Nueva Vizcaya
1,012,000
1,012,000
Real property tax
United States of America
U.S. Department of the Treasury
Internal Revenue Service
9,625,000
9,625,000
Federal Corporate Income and Withholding tax paid
United States of America
State of South Carolina
Department of Revenue
1,225,000
1,225,000
South Carolina Corporate Income tax paid
United States of America
State of South Carolina
South Carolina Department of
Natural Resources
1,919,000
1,919,000
Endowment payment to the South Carolina Department of Natural
Resources Heritage Trust program.(5)
United States of America
State of South Carolina
Department of Treasury
1,800,000
1,800,000
Reclamation bonding
United States of America
Lancaster County, South Carolina
2,740,000
2,740,000
Property taxes



Additional Notes:
(1)All payments are reported in United States dollars (the reporting currency of the reporting entity) and have been rounded to the nearest $1,000.
(2)Payments have been converted to United States dollars from New Zealand dollars and Philippine pesos using a weighted average of the relevant monthly average exchange rates during the period. Average exchange rates for the year were NZD:USD 0.5821 and USD:PHP 57.4713 in 2025.
(3)Under the Mining Act in the Philippines, OceanaGold is required to invest 1.5% of its operating costs incurred to pay for a range of social development and community related programs.
Payments made under the Social Development Management Program ('SDMP') included in this report totalled ~$2.4 million. Payments made under the Information Education and Communication ('IEC') and Development of Mining, Technology and Geo-Sciences ('DMTG') programs included in this report totalled ~$0.9 million. This report includes payments made within a Barangay, Local Government Unit or Municipality where the total exceeded the applicable threshold.
Following the FTAA renewal, OceanaGold is required to invest the equivalent of an additional 1.5% of gross revenue which is to be allocated to community development. Payments made to the Community Development Fund ('CDF') and Provincial Development Fund ('PDF') totalled ~$3.3 million (excluding administration costs) and ~$1.7 million, respectively.
(4)In accordance with a Memorandum of Agreement, OceanaGold made payments totalling ~$1.5 million to the account of the Quirino Provincial Development Fund which shall be utilized exclusively for the community development projects of the Province of Quirino.
(5)OceanaGold is required to provide financial support to a Heritage Trust program in the form of an annual endowment payment over a 14 year period in accordance with its agreement with South Carolina's Department of Natural Resources. OceanaGold Corporation's ESTMA Reports are available at: https://oceanagold.com/investors/results-and-filings



UNCLASSIFIED - NON CLASSIFIÉ

Extractive Sector Transparency Measures Act - Annual Report
Reporting Year
From:
1/01/25
To:
12/31/25
Reporting Entity Name
OceanaGold Corporation
Currency of the Report
USD
Reporting Entity ESTMA
Identification Number
E840887
Subsidiary Reporting Entities (if
necessary)
Payments by Project

Country

Project Name1

Taxes

Royalties

Fees

Production Entitlements

Bonuses

Dividends
Infrastructure Improvement Payments
Total Amount paid by Project

Notes23
New Zealand
North Island
1,899,000
1,064,000
2,963,000
New Zealand
South Island
40,692,000
4,634,000
1,467,000
46,793,000
Philippines
Didipio Mine
75,867,000
1,420,000
11,531,000
88,818,000
United States of America
Haile Gold Mine
13,590,000
3,719,000
17,309,000

Additional Notes3:

(1)All payments are reported in United States dollars (the reporting currency of the reporting entity) and have been rounded to the nearest $1,000.
(2)Payments have been converted to United States dollars from New Zealand dollars and Philippine pesos using a weighted average of the relevant monthly average exchange rates during the period. Average exchange rates for the year were NZD:USD 0.5821 and USD:PHP 57.4713 in 2025.