Steam coal, also called thermal coal, refers to the coal used in boilers to produce steam that can be used for various purposes. Steam coal is a derivative of coal, as a black stone that burns when exposed to high heat. Coal is used throughout the world today as a primary source of energy and is naturally found as sedimentary rock The types of coal that we can supply are 5 types according to the Indonesian Coal Index (ICI), namely as follows: ICI-1 â?¢ GAR : 6500 â?¢ NAR : 6200 â?¢ Sulfur : Up to 1% â?¢ Ash : Up to 12% â?¢ Total Moisture : Up to 12% ICI-2 â?¢ GAR : 5800 â?¢ NAR : 5500 â?¢ Sulfur : Up to 0.8% â?¢ Ash : Up to 10% â?¢ Total Moisture : Up to 18% ICI-3 â?¢ GAR : 5000 â?¢ NAR : 4600 â?¢ Sulfur : Up to 0.6% â?¢ Ash : Up to 8% â?¢ Total Moisture : Up to 30% ICI-4 â?¢ GAR : 4200 â?¢ NAR : 3800 â?¢ Sulfur : Up to 0.4% â?¢ Ash : Up to 6% â?¢ Total Moisture : Up to 40% ICI-5 â?¢ GAR : 3400 â?¢ NAR : 3000 â?¢ Sulfur : Up to 0.2% â?¢ Ash : Up to 4% â?¢ Total Moisture : Up to 50%