Arief brings extensive expertise from the financial-services and corporate sectors to his role. He has been a key member of AMMAN’s executive team for more than eight years, previously serving as Director of Finance where he played an instrumental role in shaping AMMAN’s financial strategy and corporate transformation.
Prior to joining AMMAN, he served as the Managing Director and Board Member of Rajawali Corpora, an Indonesian conglomerate with diverse investments spanning mining, palm oil plantations, luxury hotels and properties, transportation, infrastructure and media. During his tenure, Arief held key roles on various committees including Finance and Investment, Ethics, Audit, and Risk Management, as well as the Management Board.
He led Goldman Sachs’ investment banking operations in Southeast Asia. He holds dual bachelor's degrees in finance and engineering from the University of Pennsylvania (summa cum laude), and an MBA from Harvard Business School. He was appointed as President Director of AMMAN in June 2025.
Aditya brings over a decade of experience in consulting and banking. He has advised clients across industries such as mining, logistics, utilities, plantations, telecommunications, manufacturing, and banking. His areas of expertise include business planning, financial modeling, valuation, market entry strategy, due diligence, transaction advisory, credit analysis, and relationship management.
Since joining PT Amman Mineral Nusa Tenggara (AMNT), a subsidiary of AMMAN, in 2017 as Deputy Director, and subsequently being appointed Director in 2020, Aditya has been instrumental in strengthening the company’s core support functions. His responsibilities have included overseeing procurement, port and logistics, inventory and warehousing, as well as co-leading internal audit. He also previously led corporate communications and information technology, where he contributed to the successful execution of AMMAN’s enterprise resource planning (ERP) transformation.
Aditya earned a Bachelor of Science in Business Administration with a minor in Finance from Suffolk University, Boston, and a Certificate of Special Studies in Finance and Control from Harvard University Extension School, Cambridge. He assumed the role of Director at AMMAN in June 2025.
David Gibbs brings over 45 years of international experience in large-scale mining across various commodities including copper, gold, diamonds, uranium, coal (thermal and coke), talc, and nickel laterite. His extensive career spans both underground and open pit mining operations in South Africa, Namibia, Papua New Guinea, Australia, Thailand, and Indonesia.
David's expertise encompasses feasibility study management, mine planning, operations, productivity improvement, cost reduction, research and due diligence, strategic planning, and project evaluation and development. He holds a BSc Honours degree in mining engineering and certifications including Mine Manager Certificates for Western Australia and South Africa. David is an Associate of The Royal School of Mines (ASRM) and a Chartered Engineer (C Eng).
David was appointed Director of AMMAN in February 2021. In addition to his role at AMMAN, David serves as a Non-Executive Director of Macmahon Holdings Ltd, an ASX-listed mining contractor, since 2023.
Dr. Naveen brings over 25 years of executive experience in global mining operations, commercial and commodity trading, acquisitions, mergers, and strategic development to AMMAN. He has held significant management roles across various industrial sectors.
Before joining AMMAN in 2016, Dr. Naveen served as CEO of RAK Minerals and Metals Investments FZC, United Arab Emirates, from 2007 to 2011, followed by a role as President Director of Trimex International Indonesia from 2012 to 2016. He holds a master's degree in chemistry and a doctorate from Jadavpur University, India. Dr. Naveen also completed the Advanced Management Program at Harvard Business School. Dr. Naveen was appointed Director of AMMAN in February 2021.
Irwin brings over two decades of global experience in the mining, earthworks, and engineering sectors to AMMAN. Since joining in 2016, Irwin has played a key role in operational and cultural transformation during the ownership transition.
Before his tenure at AMMAN, Irwin held senior management positions at Leighton (Thiess) Contractors and served as a lead advisor for the HKND Group on the Nicaragua Grand Canal project—the largest earthworks and infrastructure project at the time. He also served as Project Director and Head of Mining for ASX-listed Hunnu Coal Limited and SET-listed energy company Banpu, overseeing coking coal mines in Mongolia.
Irwin is a member of the Australian Institute of Mining and Metallurgy and is qualified as a Competent Person for JORC Code reporting. He holds multiple degrees in engineering with honors and commerce (corporate finance, financial investment, and accounting) from the University of Western Australia. Irwin assumed the role of Director at AMMAN in February 2021.