An Indonesian citizen, Rachmat Makkasau has a strong background in mining operations and has held various leadership roles in the mining industry. He earned a Bachelor's degree in Economics and a Master's degree in Management from Bina Nusantara University. Appointed President Director of Amman Mineral Nusa Tenggara on November 2, 2016, Rachmat also serves as Director and Commissioner of several companies within various corporate groups.