Welcome to PT Indomining, one of Indonesias lowest cost producers of thermal coal located in Sanga-Sanga, East Kalimantan. It is part of the Toba Sejahtra Group along with parent coal mining company Toba Bara . Corporate Social Responsibility. School Support Scholarship. Nutrition for Kids. Regreening Cassava Plantations. Jun 22, 2021 a company incorporated in Indonesia, principal business of which is coal mining and it operates a mining concession that covers an area of 1,179 hectares and the coal mine is located at Dusun Timur Sub-District, Barito Timur Regency, Central Kalimantan, Indonesia.