Board of Directors

Brian Martin is the Chairman of the Board and Executive Director of OceanaGold (Philippines), Inc. and serves as Senior Vice President, Business Development and Investor Relations at OceanaGold Corporation.

A seasoned mining executive with two decades of experience in the metals and mining sector, Mr. Martin brings deep expertise in corporate strategy, investor engagement, and business development. In his current role, Mr. Martin leads OceanaGold’s investor relations program, advances strategic growth initiatives, and plays a central role in shaping and executing the company’s corporate strategy. He was instrumental in the successful initial public offering of OceanaGold Philippines in 2024.

Prior to joining OceanaGold, Mr. Martin held senior roles in corporate development and investor relations at SSR Mining Inc. and Liberty Gold Corp. At SSR Mining, Mr. Martin was a leading member of a top-performing corporate development and investor relations team, helping to propel its growth into a premier intermediate precious metal producer. Mr. Martin began his career in equity research at a Canadian investment bank, focusing on precious metal mining companies. He holds a Bachelor of Commerce degree from the University of British Columbia and is a CFA Charterholder.

Joan D. Adaci-Cattiling is a member of the Board and the President and General Manager for External Affairs and Social Performance. She started as Head of the Legal Department of the business unit in July 2007, and later as Senior Vice President for Legal and Human Resources. She also serves as the President and a director of other Philippine subsidiaries of OceanaGold.

Before joining OceanaGold in 2007, Ms. Adaci-Cattiling was a member of the Legal Department at Mirant (Philippines) Corporation, and an Associate at SyCip Salazar Hernandez & Gatmaitan Law Office.

Currently, she serves as a Trustee of the Chamber of Mines of the Philippines and Diwata – Women in Resource Development, Inc., as a Member of Nueva Vizcaya Provincial Mining Regulatory Board and the Quirino Provincial Mining Regulatory Board, and as an Industry Representative for Philippine Extractive Industries Transparency Initiative (PH-EITI) Multi-Stakeholder Group. Ms. Adaci-Cattiling holds a Bachelor of Arts in Communications and a Bachelor of Laws from the University of the Philippines. She ranked fifth in the 2000 Philippine Bar Examinations.

David John Bickerton is a Director of OceanaGold (Philippines), Inc. and the Asset President of Didipio Operations.  He is an accomplished mining management professional, having spent the past 13 years in senior roles across OceanaGold leading design, construction, commissioning, production ramp up, operation, and closure. He previously held a range of roles including Project Director – Waihi Expansion (New Zealand) where he led the development of the consenting strategy and lodgment of the Waihi North consent application, General Manager – Project Execution (Queensland, Australia) finalizing the scope and leading the execution of the Reefton Restoration closure program, Vice President – Project Execution Haile Gold Mine Construction and Commissioning (South Carolina, United States of America), Integration Manager – Waihi Gold Mine Acquisition, General Manager – Didipio Operations (2014) and Project Manager – Didipio Project Execution (2011-2014).

Prior to joining OceanaGold, Mr. Bickerton held various positions in the resources industry including Lihir Gold (Papua New Guinea), Yabulu Nickel Refinery (Queensland, Australia), and Transfield Services (Queensland and Western Australia). He holds a Diploma of Project Management from Deakin University, and a Master of Business Administration from Australian Institute of Management

Gregory L. Domingo worked in the private sector for the last 40 years and served twice in the Philippine government –as Secretary of the Department of Trade and Industry from July 2010 to December 2015 and as Head of the Board of Investments from May 2001 to April 2004. During his stint in the government, he chaired the Asia- Pacific Economic Cooperation Trade Ministers meetings in 2015 and was a Vice Chairperson of the World Trade Organization Ministerial meeting in Nairobi in 2015.

He is currently a Board Adviser to SM Investments Corporation and Alternergy Holdings Corporation, and a member of the Board of Directors of BDO Private Bank, Belle Corporation and other Philippine companies. Mr. Domingo holds a Master’s in Business Administration from the Asian Institute of Management and a Master’s degree in Operations Research from the Wharton School of the University of Pennsylvania. He also holds a Bachelor of Science in Management Engineering at the Ateneo de Manila University.

Mia G. Gentugaya is a professional lecturer at the University of the Philippines (JD and LLM Programs) and Lyceum of the Philippines University – College of Law. She was a former senior partner at SyCip Salazar Hernandez & Gatmaitan (SyCipLaw) until her retirement in 2016 and also acted as an Of Counsel of said law firm until December 31, 2021. Prior to her retirement from SyCipLaw, she headed its Banking, Finance & Securities Group and was a member of its Executive Committee.

Ms. Gentugaya is also currently an independent director of Philippine Capital Commercial, Inc., a BSP-licensed investment house in the Philippines, a director and the Corporate Secretary of BW Shipping Philippines, Inc. (a manning company), and of Synbiotic Food Corporation (a manufacturer of carabao milk probiotic products), as well as the President of Chamomile Holdings, Inc. (a personal holding company). She is a director of the Academy for Children of All Abilities Philippines, Inc. doing business as The Vanguard Academy, a K-12 inclusive educational institution for children of all abilities. She also sits as a director of various companies in the real estate sector and other holding companies in the same industry.

Ms. Gentugaya holds a Master of Laws and Juris Doctor degrees from the University of the Philippines – Diliman, and a Bachelor of Bachelor of Arts (Political Science) degree from the University of the Philippines – Iloilo.

Keenan Jennings joined OceanaGold Corporation in September 2025 as Chief Exploration Officer. He is responsible for exploration and geology across the Company and Chairs the Resources and Reserves Steering Committee.

Mr. Jennings is a deeply experienced geologist with 35 years of global exploration and commercial success. He has held several executive roles with BHP, Rio Tinto, and Anglo American. Keenan began his career in Australia before moving to Latin America and then London to take up a corporate leadership role in Anglo American’s head office. He was most recently VP Metals Exploration for BHP, based in Toronto, Canada, where he led a team of 140 people and was accountable for designing and implementing the long-term global strategy for BHP exploration.

Originally from New Zealand, Keenan is a graduate from the University of Auckland (Master of Science) and Deakin University (MBA).

He is a fellow of the Society of Economic Geologists, and a member of the Australian Institute of Directors.

Marius van Niekerk was appointed Chief Financial Officer of OceanaGold Corporation in May 2023.

Mr. van Niekerk is a mining executive with approximately 25 years of broad-based mining and technology industry experience spanning South Africa, the UK (London), Mozambique, Singapore and Canada. Prior to joining OceanaGold, he spent the vast majority of his mining career working for various operations and corporate centers across BHP and Newcrest where he focused on strategy, functional excellence, energy negotiations, M&A commercial integrations, technology advancements, First Nations engagements and a range of value delivery and synergy initiatives.

Mr. van Niekerk has experience in aluminium, alumina, energy, energy coal, gold and copper.

He holds a Bachelor in Economic and Management Sciences from the University of Pretoria (South Africa), an Honors in Accounting Sciences from the University of South Africa and he is a Chartered Accountant in South Africa and a CPA in Ontario, Canada. Mr. van Niekerk is a graduate of the University of Toronto / Rothman Business School – Institute of Corporate Directors Program in Canada and holds the ICD.D designation.

Eduardo A. Sahagun is Executive Vice President, Cement of PHINMA Corporation effective April 2026. He was first elected as a Director of the Company in April 2021.

He is the President and Chief Executive Officer of Philcement Corp. since 2017. He is also a Director of Philcement Corp., Philcement Mindanao Corp., PSEC, Union Insulated Panel Corp., PHINMA Property Holdings Corp., PHINMA Insurance Brokers, Inc., Song Lam Joint Stock Company, First Batangas Hotel Corporation, and Cagayan de Oro College, Inc., and also serves as a member of the PHINMA Foundation, Inc.’s Board of Trustees. He also is the current Chairman of Edcommerce Corporation. He served as Chairman of the Audit Committee and an Independent Director of Philippine Savings Bank for 9 years until 2026.

Mr. Sahagun was the President and Chief Executive Officer of Union Galvasteel Corp., and PHINMA Solar Energy Corp. from 2017 to 2025. Prior to his return to PHINMA, he was the first Filipino President and Country Chief Executive Officer of Holcim Philippines Inc., a Director of Holcim Philippines Manufacturing Corporation, and a Director of Holcim Mining and Development Corporation.

A Certified Public Accountant, Mr. Sahagun obtained his Bachelor of Science in Commerce degree, major in Accounting from Holy Angel University and his Masters Degree in Business Administration from the Ateneo Graduate School of Business. He also earned his graduate degree in Management Science from the Arthur D. Little Management Education Institute (now known as Hult International Business School) in Cambridge, Massachusetts, USA. He likewise took up the Senior Management Program, Senior Leadership Program, and Managing Change Program at the Institute for Management Development, based in Lausanne, Switzerland.