Board of Directors and Officers

The Board of Directors is responsible for achieving the company's aims, strategy and policy, and results. In discharging its role, the board is guided by the interests of the company, taking into consideration the interests of the company's stakeholders. The board is responsible for complying with all relevant legislation and regulations, for managing the risks associated with the company activities, and for financing the company.

Gerard H. Brimo

Executive Director

Chairman of the Board of Directors

Age: 70

Date First Elected to the Board: August 1, 2009

GERARD H. BRIMO is the Chairman of the BOD of the Company since August 7, 2018. He is a member of the Corporate Governance Committee of the Company. He is also the Chairman of all of the Company's mining subsidiaries and an Independent Director of SBC and Commonwealth Foods, Inc. Prior to his career in mining, he worked for Citibank for eight (8) years, and was a Vice President in the bank's Capital Markets Group in Hong Kong prior to joining Philex Mining Corporation as Vice President - Finance. Mr. Brimo served as Chairman and CEO of Philex Mining Corporation from 1994 until his retirement in December 2003. He served as President of the Chamber of Mines of the Philippines from 1993 to 1995, as Chairman from 1995 to 2003 and from 2017 to 2021. He received his Bachelor of Science degree in Business Administration from Manhattan College, USA and his Master of Business Management degree from the Asian Institute of Management.

Listed companies of which Mr. Brimo is presently a director:


  1. Nickel Asia Corporation
  2. Security Bank Corporation (Independent)

Martin Antonio G. Zamora

Executive Director

President and Chief Executive Officer

Age: 49

Date First Elected to the Board: June 16, 2010

MARTIN ANTONIO G. ZAMORA is the President and CEO of the Company. He is the President of all the mining subsidiaries of the Company and the Chairman of the Board of Directors of EPI and its subsidiaries. Before joining NAC in 2007, Mr. Zamora was the Philippine Country Manager and a Director of UPC Renewables, a global developer, owner and operator of wind farms and solar facilities. Prior to that, he worked for ten (10) years for finance and investment banking firms such as CLSA, Robert Fleming & Co. (UK), Jardine Fleming, and SGV & Co. He received his Bachelor of Science in Management from Ateneo de Manila University (Philippines), his MBA from London Business School (UK), and his Masters in Organizational Psychology from INSEAD.

Listed companies of which Mr. Zamora is presently a director:


  1. Nickel Asia Corporation

Harvey T. Ang

Non-Executive Director

Age: 49

Date First Elected to the Board: June 3, 2022

MR. HARVEY T. ANG is the President of Yeeloofa Development Corporation. Prior thereto, he was Business Development Manager of Exchange Properties Resources Corporation from July 2004 to July 2007. He was also the Export Director of Solid Mills, Inc. from July 1999 to October 2003. Aside from his experience in the real estate and textile industries, he has had significant experience in the logistics and retail and marketing industries. Mr. Ang obtained his Bachelor of Science in Management, minor in Legal Management, from the Ateneo De Manila University.

Florencia Gozon Tarriela

Independent Director

Date First Elected to the Board: August 04, 2022

FLORENCIA GOZON TARRIELA is the second female member of the Board, joining Ms. Maria Patricia Z. Riingen who is the first female Director of the Company. She is a Board Advisor of the Philippine National Bank (PNB), an Independent Director of the LT Group Inc., and a Director of PNB Capital & Investment Corporation, PNB International Investment Corporation, Gozon Development Corporation and Tulay sa Pag-unlad Inc., a microfinance nongovernment organization. She is also a liaison director to the Financial Executives Institute’s Ethics and Financial Inclusion committees, a fellow of the Institute of Corporate Directors, a GoNegosyo mentor, and a member of the Filipina CEO Circle and Women Business Council Philippines.

She previously served as Board Chair and Independent Director of PNB for 15 years and Undersecretary for the Department of Finance. She was the first Filipina Vice President in Citibank N.A., President of the Bankers Institute of the Philippines, Director of the Bankers Association of the Philippines, and of the Philippine Bible Society. She has co-authored and compiled several books on ethics, mentorship, and gardening, among others, and continues to be a regular columnist for Manila Bulletin and Business World.

Ms. Tarriela obtained her Bachelor of Science in Business Administration, major in Economics, from the University of the Philippines, and obtained her Master’s degree in Economics from the University of California, Los Angeles.

Shiro Imai


Age: 49

Date first elected to the Board: June 28, 2022

SHIRO IMAI is the Chairman and President of Sumitomo Metal Mining Philippine Holdings, Inc., Coral Bay Nickel Corporation, and Taganito HPAL Nickel Corporation. He has been with for Sumitomo Metal Mining Co. Ltd. (SMM) since 1995. Prior to his assignment in the Philippines, he was the Manager of the Copper and Precious Raw Materials Department from June 2016 until September 2019 , and served as Chief Representative of SMM’s London Office from July 2014 to May 2016 . He was also part of Nickel Sales and Raw Materials Department of the Non-Ferrous Metals Division from November 2009, the Sales and Marketing Section of the Advanced Materials Division from February 2001 until October 2009 , and the Sales and Marketing Section of the Electronics Division from April 1995 to January 2001 . Mr. Imai obtained his Bachelor’s degree of Faculty of Economics from Tohoku University in Miyagi, Japan

Yusuke Niwa

Non-Executive Director

Age: 54

Date First Elected to the Board: August 5, 2021

YUSUKE NIWA is the General Manager of the Nickel Sales and Raw Materials Department, Non-Ferrous Metals Division of SMM. He has more than thirty (30) years of experience in SMM's non-ferrous metals and materials businesses, specializing in the fields of accounting, project management and administration. He likewise held significant posts relative to the Sierra Gorda copper mine of SMM in Chile. Mr. Niwa is also an incumbent director of the Company's affiliates, THNC, CBNC and Nickel Asia Holdings, Inc. He obtained his Bachelor of Science degree in Political Science and Economics from Waseda University in Tokyo, Japan.

Listed companies of which Mr. Niwa is presently a director:


  1. Nickel Asia Corporation

Maria Patricia Z. Riingen

Non-executive Director

Vice chairman

Age: 56

Date First Elected to the Board: May 20, 2019

MARIA PATRICIA Z. RIINGEN was first elected as a Director of the Company on May 20, 2019. She is the President of Manta Equities, Inc (Manta) and Manta Foundation, Inc and a Director of Mantra Resources, Inc. She is also a Director of EPI. Prior thereto, she held various positions with the Western Union Company, and was the Senior Vice President and Regional Head for Asia Pacific. Her other previous roles were as Executive Director and a member of the Board of Directors at the Asian Development Bank, Vice President at Citibank N.A., and Brand Manager of Procter & Gamble. She is a member of the Young President's Organization (YPO). She was among Asia's Top 20 People in Cash Management selected by Finance Asia in 2011 for being one of the region's most influential power players and up-and- coming executives in the cash management industry. In 2013, Ms. Riingen was recognized as one of the 100 Most Influential Filipinas in the World for her accomplishments as a Filipina senior executive working in a global company. In the same year, she received the Pinnacle Group's CSR Award for spearheading a range of initiatives for better access to financial services in the Philippines. Ms. Riingen obtained her Bachelor of Science degree in Business Administration, major in Marketing, Magna Cum Laude, from the University of the Philippines.

Listed companies of which Ms. Riingen is presently a director:


  1. Nickel Asia Corporation

Angelo Q. Valencia

Independent Director

Age: 54

Date First Elected to the Board: May 8, 2020

ANGELO RAYMUNDO Q. VALENCIA is the Chairman of the Board Risk Oversight Committee and a member of the Related Party Transactions, Audit, and Nominations Committees of the Board. He is likewise an Independent Director of GR Bank, Inc., Country Bankers Life and Non-Life Corporations. In these regulated public companies, he is the Chairman of the Corporate Governance Committees. Mr. Valencia is Presidential Adviser on Food Security, Education, and Environmental Stewardship of the Integrated Bar of the Philippines. He is also a Senior Fellow at the Development Academy of the Philippines, and a Lecturer at the Armed Forces of the Philippines (AFP) Command Staff Graduate Course. He also serves as Senior Advisor to the NOLCOM Heroes Foundation, Philippine Marine Corps, the Philippine Air Force, and AFP Leadership Development Center. He was also a Senior Corporate and Tax Counsel of the Lucio Tan Group and Chief Operating Officer of Mindanao Grains Processing Co., Inc. Mr. Valencia has received numerous awards and citations for his public service endeavors. He founded the project Klasrum ng Pag-asa, a private sector initiative that builds, augments and reconstructs public school structures nationwide. He obtained his Juris Doctor from the Ateneo School of Law in 1998. He is a member of the Philippine Bar.

Listed Companies of which Mr. Valencia is a Director:


  1. Nickel Asia Corporation (Independent)

Leonides Juan Mariano C. Virata


Age: 41

Date first elected to the Board: June 28, 2022

LEONIDES JUAN MARIANO C. VIRATA is the Chief Executive Officer of Cavitex Holdings Inc. and the Managing Director of MTC Investment Properties. Prior thereto, he was with the Broking Research team of Platinum Securities from 2006 to 2010. He is a member of Makati Business Club. He received his Bachelor of Arts, Major in Philosophy of Religions from University of Pennsylvania.

Board of Advisors

Manuel B. Zamora, Jr.
Frederick Y. Dy
Philip T. Ang


Gerard H. Brimo
Chairman of the Board of Directors

Maria Patricia Z. Riingen
Vice Chairman

Martin Antonio G. Zamora
President and Chief Executive Officer

Georgina Carolina Y. Martinez
Senior Vice President – Compliance and Corporate Support Services Group;
Chief Compliance Officer;
Chief Governance Officer;
Assistant Corporate Secretary

Maria Angela G. Villamor
Senior Vice President – Finance and Revenue Management Group;
Chief Financial Officer

Jose Bayani D. Baylon
Senior Vice President - Sustainability, Public Affairs, and Communications Group
Chief Sustainability Officer

Rolando R. Cruz
Vice President - Corporate Planning and Revenue Assurance Center

Rommel L. Cruz
Vice President - Mine Strategic Planning and Officer-in-Charge, Vice President - Revenue Generation Group

Christopher C. Fernandez
Vice President – Information and Communications Technology Sector

Koichi Ishihara
Vice President - Mine Services Center

Maria Fatima C. Mijares
Vice President – Human Resources Sector

Gerardo Ignacio B. Ongkingco
Vice President - NAC Development Sector

Romeo T. Tanalgo
Vice President – Security and Administrative Services Sector;
Chief Risk Officer;
Officer-in-Charge, Risk and Assurance Group

Bimbo T. Almonte
Assistant Vice President – Occupational Health Sector

Salvador C. Cabauatan
Assistant Vice President – General Administrative Services Sector

Remedios C. Camo
Assistant Vice President - Industrial Safety Sector;
Officer-in-Charge of Environment Sector

Jeffrey B. Escoto
Assistant Vice President — Technical Services Sector

Patrick S. Garcia
Assistant Vice President – Internal Audit;
Chief Audit Executive

Rodrigo V. Gazmin, Jr.
Assistant Vice President - Material Management Sector

Marnelle A. Jalandoon
Assistant Vice President – Business Applications Division

Ryan Rene C. Jornada
Assistant Vice President – Public and Social Affairs Sector

Arnilo C. Milaor
Officer-in-Charge — Mine Production Center

Christine Joanne C. Navarro
Assistant Vice President – Legal Sector and Data Protection Officer

Iryan Jean U. Padillo
Assistant Vice President — Officer-in-Charge of Accounting and Finance Reporting Center

Walter B. Panganiban
Assistant Vice President-Risk Management Sector

Teody A. Pascual
Assistant Vice President – Service Management Sector

Jessie A. Payuyo
Assistant Vice President – Accounting and Financial Reporting Sector

Kristine Grace C. Victoria
Assistant Vice President – Geologic Management Sector

Charito Villena-Co
Assistant Vice President - Tax Compliance and Advisory Services Sector

Jessie N. Pagaran
Assistant Vice President - Employee, Labor, and Industrial Relations Division

Andre Mikael Lu Dy
Assistant Vice President - Treasury and Investor Relations Sector

Barbara Anne C. Migallos
Corporate Secretary

Rio Tuba Nickel Mining Corporation

Engr. Ronelbert A. Suguitan
OIC-Resident Mine Manager

Taganito Mining Corporation

Artemio Valeroso
Assistant Vice President
Resident Mine Manager

Cagdianao Mining Corporation

Fernando P. Cruz
Assistant Vice President

Engr. Christian Gascon
OIC-Resident Mine Manager

Hinatuan Mining Corporation

Fernando P. Cruz
Assistant Vice President

Francisco J. Arañes
Assistant Vice President
Resident Mine Manager

Dinapigue Mining Corporation

Fernando P. Cruz
Assistant Vice President

Cordillera Exploration Co., Inc.

Graciano P. Yumul, Jr.
Senior Vice President