Mark Stone

Chairman 
Date Appointed: 25 April 2025 
Chairman – Remuneration Committee

Mark has over 30 years’ experience in the international mining industry. His roles have focussed on leading all people aspects of operating a business, his positions as an active member of various executive leadership teams have equipped him with a solid knowledge of the levers for success in a global mining company. 

Mark has worked in Australia, PNG, Africa and South, Central & North America in major resource companies such as BHP, MMG, First Quantum and most recently with Ok Tedi Mining Limited. His commodity experience includes coal, copper, gold, silver and manganese. 

He holds a Bachelor of Commerce degree from the University of Newcastle (Australia) and is a member of the Australian Human Resources Institute, the Australasian Institute of Mining & Metallurgy and the Australian Institute of Company Directors. 

Kedi Ilimbit

Managing Director & CEO 
Date Appointed: 17 April 2023 

Kedi brings over 25 years experience in the mining industry across coal, iron ore, zinc, lead, silver, and copper sectors. 

He began his career as a graduate with Ok Tedi in 1995, before exploring the Australian resources sector where he worked as Manager Mobile Assets at Koolynobbing Iron Ore operations in Western Australia with Cliffs Natural Resources.  

After rejoining Ok Tedi in 2015, Kedi progressed through key leadership roles such as Manager Mine Maintenance, General Manager Processing, General Manager Asset Management, General Manager Community & Operations Support, and Deputy CEO, before being appointed Managing Director & Chief Executive Officer. 

Kedi holds a Degree in Mechanical Engineering from the PNG University of Technology, a Diploma in Management (Front Line Supervision) and a Graduate Diploma in Maintenance Management from Central Queensland University. 

Robert Kaiyun

Director (Independent) 
Date Appointed: 23 August 2018 
Member – Environment, Safety & Governance Committee 

Robert is the Provincial Administrator for Western Province and has been actively engaged in Local Level Government (LLG) functions in Western Province for a number of years.  

His remit covers the coordination of LLG Operations, provision of strategic leadership and management of transport and institutional infrastructure development, and as chief advisor to the Fly River Provincial Government and team leader for the Western Province Administration he is responsible for the implementation of policies, plans and programs for service delivery and development administration in the province. 

He holds a Diploma in Public Administration from the PNG Institute of Public Administration, and a Bachelor of Management and a Master of Leadership in Business Administration from the Divine Word University in Madang. 

Sarimu Kanu

Director (Independent) 
Date Appointed: 23 January 2023 
Member – Appointment and Remuneration Committee 

Sarimu brings over 25 years of experience in the mining industry, with a strong focus on mine management, logistics, and operational leadership across Papua New Guinea. 

He has held senior roles at several major mining operations, including with Ramu Nico Management (MCC) Limited and Tolukuma Gold Mine Limited, Niuminco Limited, Bestino and Ok Tedi Mining. Through his role as Manager Mineral Division at Orogen Minerals Limited, he oversaw interests in key projects such as Porgera, Lihir, Misima, and Ramu Nickel.  

He holds a Bachelor of Engineering degree in Mining from the Western Australia School of Mines and Curtin University of Technology in Australia. 

Sarimu is the Managing Director and Chief Executive Officer of Kumul Minerals Holdings Limited, with other professional appointments including Member of the Board of Examiners of Mineral Resources Authority, PNG. 

Augustine Mano

Director (Independent) 
Date Appointed: 23 August 2018 
Chairman – Audit and Risk Committee 

Augustine has extensive experience in the mining and petroleum industries with a focus on business development and investment management.  

He has previously served as a consultant to the Department of Petroleum and Energy. In his current role with MRDC, he manages major investments in property development and hospitality. 

He holds a Master of Science in Petroleum Economics from Dundee University, Scotland, and a double Degree in Economics and Arts majoring in Environmental Science from the University of Papua New Guinea. 

Augustine currently serves as Managing Director and Chief Executive Officer of Mineral Resources Development Company (MRDC); is Chairman of Pearl South Pacific Resort in Fiji, Star Mountains Plaza in PNG and Taumeasina Resort in Samoa; and serves as Director for Bank South Pacific, PNG Air, Hevilift Group and other private companies. 

Marjella Meles

Director (Independent) 
Date Appointed: September 2022 

Marjella is a skilled geotechnical engineer with over two decades in the commodities space across gold, iron ore and coal. 

He has experience providing advice on existing mining operations, brown-fields, greenfield, mine closure and asset acquisition and has international experience with Rio Tinto and BHP Billiton. He has previously worked at multiple PNG mines including Lihir and Porgera.  

He holds a Bachelors Degree in Geology from the University of Papua New Guinea, a Masters Degree in Mining Engineering from the University of New South Wales, and is a Chartered Professional with the Australian Institute of Mining and Metallurgy and Registered Engineer with the Board of Professional Engineers Queensland (RPEQ). 

Marjella currently serves as Director of Kumul Minerals Ok Tedi Limited and of Kumul Minerals Holdings Limited. 

Bonny Ninai

Director (Independent) 
Date Appointed: 10 December 2021 
Member – Environment, Safety & Governance Committee 

Bonny is an experienced legal professional with over 30 years of expertise in legal governance, policy and commercial law.  

He has previously held Deputy Solicitor General and Acting Solicitor General (Solicitor General’s Office) positions within the Department of Justice and Attorney General, and also held senior positions at private sector law firms within PNG.  

In 1995, Bonny worked as instructing Solicitor on behalf of the State, assisting the Ok Tedi and BHP legal team in the Ok Tedi Environmental Litigation case.  

Bonny holds a Bachelor of Laws Degree from University of PNG and a Master of Laws (Corporate and Commercial) Degree from University of Adelaide. He has previously served as Director on a number of Boards and is currently Chairman of Kumul Minerals Ok Tedi Limited and is a Director of the Kumul Minerals Holdings Ltd. 

Dr. Ila Temu

Director (Independent) 
Date Appointed: 23 January 2023 
Member – Audit and Risk Committee 

Dr Temu is a corporate affairs professional with many years’ experience across the mining and metals industry in both PNG and abroad. 

He has held senior roles across several mining companies including Barrick (Niugini) Limited (BNL) and Placer Dome Niugini, and was previously Managing Director of Mineral Resources Development Company (MRDC). 

Dr Temu holds a Bachelor of Economics from the University of Papua New Guinea, a Masters in Agricultural Development Economics from the Australia National University, Canberra Australia and a Ph.D in Agricultural Economics from the University of California, Davis, USA.  

Dr Temu has previously held several Board positions in various PNG companies and is currently Chairman of Kumul Minerals Holdings Ltd, Director of Kina Bank, Director of Kina Petroleum Ltd, Director of Kumul Petroleum Holdings Ltd and Council Member of the Divine Word University.

Roberto Justo

Board Secretary 

Roberto has more than 30 years of experience in accounting, Banking and commercial finance and has been part of Ok Tedi’s Finance Department for over 15 years. 

He has a Bachelor of Science and Commerce, Majoring in Accounting, from the San Beda College, and is a Certified Public Accountant of Papua New Guinea (CPA PNG) and with the Philippine Institute of Certified Public Accountants (PICPA).