coal coal liquefaction depositional environment BCL technology Bojongmanik coals Cigudeg coals Coal liquefaction Jambi Subbasin South Sumatra Basin best practice energy consumption catalyst precursor coal characteristic coke additive corrected hydrogen and oxygen energy crisis energy effi ciency indicator energy elasticity energy projection financial analysis gasification hydrothermal dewatering inertinite investors iron ore low rank coal petrographic analyses petrographic analysis petrography polygeneration presidential decree presidential instruction rank syn-gas syntetic gas derivates and environmentally friendly tailing of PT. Freeport type utilisation