PT Amman Mineral Nusa Tenggara (AMNT) is an Indonesian mining company which operates the Batu Hijau mine. AMNT owns several other most promising prospects of copper and gold located in West Sumbawa Regency, West Nusa Tenggara Province. Batu Hijau mine is the second largest copper and gold mine in Indonesia and a world class asset.

We commenced production and operations in 2000 and have produced approximately 3.6 million tonnes of copper and 8 million ounces of gold. We have a long-term expected mine life followed by processing stockpiles. We also are driven to continue our operations by developing the significant potential of the Elang deposit and the Nangka prospect, which form part of our ongoing assessment.

We own all of our facilities that include a large fleet of mining equipment, a processing plant with 120,000 tonnes capacity per day, an 112-megawatt coal-fired power plant, a port with a ferry terminal, air services, and an established townsite.

The shareholders of PT Amman Mineral Nusa Tenggara are PT Amman Mineral Internasional (82.2%) and PT Pukuafu Indah (17.8%). PT Amman Mineral Internasional is an Indonesian company whose shares are held by PT AP Investment (50%) and PT Medco Energi International Tbk (50%). With the full support from the shareholders, we are committed to adopting the best and sustainable operating procedure by applying the most advanced green technology available.


Board of Commissioners


: Muhammad Lutfi

Muhammad Lutfi is an Indonesian businessman who has managed a broad spectrum of industries, including mining, financial, and media group. His entrepreneurial wit found its way in the 1990s when he established a renowned multimedia cohort called Mahaka Group. His stellar accomplishments then had him earn the credence as the Chairman of the Indonesian Young Entrepreneurs Association (HIPMI) and the Indonesia Investment Coordinating Board (BKPM). The former Minister of Trade was also entrusted to be the Ambassador to Japan and the Federated States of Micronesia. Lutfi is a Purdue University alumnus and regarded as the Influential Young Leader by the World Economic Forum in 2008.

Board of Directors

President Director

: Rachmat Makkasau

Rachmat Makkasau has been the President Director since March 3, 2016, bringing more than 20 years of experience in the mining industry. He began his mining experience in PT Freeport Indonesia and his tenure in Newmont Nusa Tenggara in 1999, coming up through the ranks gaining technical expertise along the way. Makkasau injects stability to the corporation and obtains trust in the international markets to maneuver one of the largest copper miners in Indonesia.

Vice President Director

: Agus Projosasmito

Agus Projosasmito has a very influential presence in the Indonesian capital market for more than three decades. He led the consortium acquiring PT Newmont Nusa Tenggara adding to his credentials in highly intricate financial and mining industries such as PT Danareksa (Persero), PT DBS Securities Indonesia, PT NC Securities, PT Nusantara Mahabakti, PT Ithaca Resources, and PT Maduma Coal Energy. Agus is also a committed member of several capital market associations in Indonesia.

Director of Planning and Strategy

: David Alexander Gibbs

David Gibbs is a mining veteran who comprehends technical operations with over 30 years of experience. He started his career as an underground miner at Rio Tinto England in 1976 and ever since came across different characteristics of open pit mining operations in Papua New Guinea, Australia, Thailand, India, Canada, and Indonesia.

Director of Business and Commercial

: Naveen Chandralal

Dr. Naveen Chandralal marked a successful 20-year profession in developing and operating mining, mineral processing, and integrated infrastructure business in Asia. The holder of a Ph.D. degree in Science from Jadavpur University, India, has co-authored numerous technical papers on Indonesian Coal, which were published by the American International Journal of Research in Formal, Applied, and Natural Science. During his seven-year stint in Indonesia, Dr. Naveen was responsible as the President Director of PT Trimex International Indonesia and previously Managing Director of RESCOM Metal Ores Trading LLC in Dubai.

Director of Finance and Operations

: Alexander Ramlie

Alexander Ramlie has extensive experience in the financial and mining sectors and played an instrumental role in PT Amman Mineral Internasional's ("AMI") acquisition of PT Newmont Nusa Tenggara (now renamed PT Amman Mineral Nusa Tenggara, or "AMNT") from Newmont Mining Corp. and Sumitomo Corp. Before joining AMNT, he managed PT Borneo Lumbung Energi & Metal Tbk as its President Director and Chief Executive Officer; he was then concurrently a Director of Bumi PLC, and Vice President Commissioner of PT Berau Coal Energy Tbk. Alex obtained a Master degree in economics from Boston University.