Coal Mining | KTC GroupHome » Services » Indonesia » Coal Mining . KTC Group entered the coal business in Kalimantan, Indonesia in 2005 under PT. KTC Coal Mining & Energy.pt irubaindo coal mining,Coal & Iron Ore mining - MercuriaCoal and Iron Ore assets enhance our ability to manage the quality, supply and price risk around the world. . PT KEL. East Kalimantan Indonesia. Strategically located open-pit thermal coal mine in East KalimantanMercuria has a strong.