R. Ishak Abdul Rahman

Part of Magnus Energy Group Ltd., PT Batubara Selaras Sapta explores and mines for coal. The company is based in East Kalimantan, Indonesia.

PT Karya Dinamika Perkasa operates motorcycle dealers. The private company is based in Yogyakarta, Indonesia.

PT Riung Mitra Lestari is a mining contractor based in Bekasi Barat, Indonesia. The Indonesian company specializes in mining contracting services.

PT Sinar Mas Group operates in a six business pillars: Pulp, and Paper, Agri-business and Food, Financial Services, Developer and Real Estate, and Communication and Technology in Energy and Infrastructure. The company was founded by Eka Tjipta Widjaja in 1938 and is headquartered in Jakarta Pusat, Indonesia.

PT Cipta Kridatama engages in the provision of contract mining and construction services. The firm offers pit contract mining services such as mining survey; topographical and geological modeling; mine design and production scheduling; drilling and blasting; mining extraction; and miscellaneous mine site services. It also focuses on construction services such as project management, materials management, and procurement support for civil infrastructures projects consisting of earthworks and site preparation; roads; well site preparation and construction; mine facilities; and concrete and steel structure works. The company was founded April 8, 1997 and is headquartered in Jakarta, Indonesia.