Slide 1: Waihi District Site Visit
Waihi District Site Visit January 21-22, 2025 CARE | RESPECT | INTEGRITY | PERFORMANCE | TEAMWORK
Slide 2: Cautionary Statements
Cautionary Statements Cautionary Note Regarding Forward-Looking Statements This presentation contains certain “forward-looking statements” and “forward-looking information” (collectively, “forward-looking statements”) within the meaning of applicable Canadian securities laws. Forward-looking stateme
Slide 3: Waihi Management Team
JUSTIN MARK ANGELA LEROY MICHAEL Waihi JOHNS Asset President BURROUGHS Superintendent, CLARK Manager, CRAWFORD-FLETT Manager, GILLES Superintendent, Management Environment People & Culture Exploration & Geology Management Accounting Team BRANDT DAVE DAVID THOMAS KYLE LEEUWENBURG OLIVER TOWNSEND TROT
Slide 4: Over 8 Million Ounces Produced in the Waihi District To-Date
Over 8 Million Ounces Produced in the Waihi District To-Date Mining began at Martha open pit Initiation of modern Underground Re-commencement Martha began operation underground mining began at of MUG production underground (MUG) mining at Favona the Correnso vein 1879 1987 2006 2017 2021 WNP early w
Slide 5: Values Share
Values Share 5
Slide 6: Current Waihi Mine Footprint
Correnso Current Waihi Mine Footprint 6 Martha Open Pit Favona Trio Martha UG Development MUG portal Process Plant & Offices TSF 1A TSF 2 6
Slide 7: Waihi District Strategic Priorities
Waihi District Strategic Priorities The Waihi District is expected to produce over 1.6 million ounces of gold over 15 years (to 2038) Operate safely and responsibly Increase Free Cash Flow generation through improved and consistent delivery of higher-grade ore to the mill Grow Reserves and Resources
Slide 8: Safety Performance
Utilizing our existing safety Continued roll-out of our Through our safety programs, systems, such as principal core safety program training, and leadership hazard management plans, and OurSafe Behaviours to development opportunities, in-field coaching to ensure a embed behaviours that we instil a c
Slide 9: Community Engagement
Community Engagement OceanaGold has consistently engaged actively and transparently with stakeholders. These long-standing relationships continue to provide a solid foundation for understanding and respecting diverse viewpoints and have been crucial in incorporating community input into the mine's o
Slide 10: Environmental Performance
Environmental Performance Strong focus on compliance and assurance Council Annual peer Responsible Gold Sustainability Level 2 corporate compliance review process Mining Principles data external assurance reports (RGMP) external assurance assurance Waihi North Project • Ongoing baseline surveying aq
Slide 11: Au Production (koz)
~50% of the LOM production reserve at MUG is from remnant mining areas Costs are Martha expected to decrease over time Underground as development Current Operations opens new mining MUG Au Production (koz) WUG Au Production (koz) AISC ($/oz) fronts at MUG 300 $3,000 $2,571 250 $2,500 Au Production (
Slide 12: MUG Remnant Mining
MUG Remnant Mining Focus on improving recovery of mineralized historical backfill and "skins" of high-grade vein material Cross section of typical remnant mining area Generalized remnant mining sequence EMW_007_FDR Step 1: EMW_007_FDR Establishment of interim CRF Historic plug above backfilled Step
Slide 13: Process Plant
Process Plant Milling & Crushing Sag mill & ball mill, ROM crusher and jaw crusher Carbon in Pulp (CIP) Circuit Processing ~500kt MUG ore per annum at ~94% Au recovery Water Treatment Plant Treats & discharges 2-3 million cubes of water annually Utilizing Continuous Improvement to maintain high plan
Slide 14: Highly Prospective District
Highly Prospective District Strategic High-grade epithermal district – extinct arc environment Position The Hauraki district has produced >12Moz of gold The Waihi camp has produced >8Moz of gold OGC has a large, consolidated tenement package adjacent to existing infrastructure Current Class Mt Au (g
Slide 15: MUG Exploration Strategy
MUG Exploration Strategy Leverage underground infrastructure Driling from existing development keeps drill costs lower Assure delivery of the mine plan Conversion to Indicated >2 years ahead of mining Grade control drilling >18 months ahead of mining Add quality ounces to Resource Explore and conver
Slide 16: Waihi North Project Team
Waihi North Project Team MICK EUAN TREVOR LOVELY LESLIE MATON Project Director Group Mining Engineer Study Director II 16
Slide 17: Waihi District PFS Highlights
Waihi District PFS Highlights OceanaGold is a safe and responsible operator with a 35-year history of exploring, operating, developing and rehabilitating projects in New Zealand Declared an initial Mineral Reserve at Wharekirauponga Underground of 4.1 Mt at 9.2 g/t for 1.2 million ounces of gold1 Pe
Slide 18: Au Production (koz)
First WUG ore expected in 2032 with commercial production in 2033 Multiple access drives Wharekirauponga allows for mining Underground rates of 800ktpa PFS Results from WUG MUG Au Production (koz) WUG Au Production (koz) AISC ($/oz) 300 $3,000 250 $2,500 Au Production (koz) 200 $2,000 AISC ($/oz) 15
Slide 19: Growth Capital Spent Over 8 Years
Growth Capital Spent Over 8 Years Projected to be funded from Free Cash Flow Growth Capex ($M)2 Sustaining Capex ($M)2 Cost per tonne mined WUG 61 16 44 Processing & Water Treatment 80 102 UG mining cost – MUG $110.8 TSF & Related 556 341 93 Other Capital1 8 UG Mining – WUG $65.2 358 MUG 63 72 LOM $
Slide 20: New Zealand Fast-track Approvals Process
New Zealand Fast-track Approvals Process Early works expected to commence in 2025 and decline development in 2026 WNP named as a proposed Fast-track Approvals Fast-track Bill passed in New Project Zealand Parliament October December 2024 2024 Q1 2025 Early works YE 2025 Expect to receive permits Per
Slide 21: Wharekirauponga has Waihi-scale potential
Wharekirauponga has Waihi-scale potential A highly prospective brownfields district >8Moz produced at Waihi Limited modern exploration relative to other mining districts Initial Reserve declared in December 2024 Current WUG With an additional Reserves1 of 1.3Mt @ 9.6g/t 4.1Mt @ 9.2g/t for 400koz for
Slide 22: Exploration Upside at the EG Vein, T-Stream & Western Veins
Exploration Upside at the EG Vein, T-Stream & Western Veins The EG Vein is the most advanced and represents the existing T-Stream and Western veins are within access permits and can WUG Reserve and Resource estimate be explored from existing sites 22
Slide 23: Rapid Exploration Success Since Discovery
Significant size and grade potential Several analogues within Rapid OGC target suite Exploration Success Since 2024 drilling focused on the EG Vein conversion to indicated, Discovery 2025 focus on Resource growth EG vein remains open in all directions 23
Slide 24: Continued Exploration Investment
Continued Exploration Investment Increased exploration activities in 2025 8,600m focused on EG vein zone 5,100m non-Wharekirauponga brownfields drilling Additional drill pads planned for Wharekirauponga through the Fast- track Approvals Process Extensive field program advancing early-stage targets 2
Slide 25: Appendix
APPENDIX 25
Slide 26: Mineral Reserves Estimate
Mineral Reserves Estimate As at June 30, 2024 Class Mt Au (g/t) Ag (g/t) Au (Moz) Ag (Moz) Proven - - - - - Martha Underground Probable 4.4 3.8 16.1 0.5 2.3 MUG Total 4.4 3.8 16.1 0.5 2.3 Proven - - - - - Wharekirauponga Underground Probable 4.1 9.2 16.1 1.2 2.1 WUG Total 4.1 9.2 16.1 1.2 2.1 Total
Slide 27: Mineral Resources Estimate
Mineral Resources Estimate As at June 30, 2024 Class Mt Au (g/t) Ag (g/t) Au (Moz) Ag (Moz) Measured - - - - - Martha Open Pit Indicated 6.05 1.95 13.4 0.41 2.81 MOP Total 6.05 1.95 13.4 0.41 2.81 Measured - - - - - Gladstone Open Pit Indicated 3.22 1.44 3.76 0.15 0.39 GOP Total 3.22 1.44 3.76 0.15
Slide 28: Technical Disclosure
Technical Disclosure Qualified Persons Except as otherwise stated herein, Peter Sharpe, Executive Vice President, Chief Operating Officer Asia-Pacific, qualified persons under NI 43-101, have reviewed and approved the disclosure of all scientific and technical information related to operational matt
Slide 29: Investor Relations Contact
400 Burrard Street #1020 Vancouver, British Columbia V6C 3B7 Brian Martin Canada SVP, Business Development & Investor Relations +1 604 678 4123 Rebecca Harris ir@oceanagold.com Vice President, Investor Relations oceanagold.com 29