Coal Specifications: Origin: Indonesia Types: Bituminous and Sub-bituminous coal GCV (Gross Calorific Value): 4,200 â?? 7,500 Kcal/kg Ash Content: 1% â?? 15% Moisture: 10% â?? 30% Sulfur Content: Low (0.2% â?? 1.0%) Services: Direct sourcing from Indonesian producers Contract-based supply with quality assurance Complete documents: CoA, Bill of Lading, etc. 2% Performance Bond for transaction security.