Research focusing on the quality of coal in Warukin Formation has been conducted in coal outcrops
located on Tabalong area, particularly in 3 coal seams, namely Wara 120 which consists of low rank coal (lignite).
Meanwhile, coals in seam Tutupan 210 and Paringin 712 are medium rank coal (sub-bituminous). Coal liquefaction
is conducted in an autoclave on low pressure and temperature. Pressure during the process is 14 psi and temperature
is 120oC. Catalyst used are alumina, hydrogen donor NaOH and water solvent. Liquefaction is conducted in three
times variables of 30 minutes, 60 minutes and 90 minutes. This process shows following yield : Wara seam 120:
25.37% - 51.27%; Tutupan seam 210: 3.02%-15.45% and seam Paringin 712:1.99%-11.95%. The average result of
yield shows that coals in seam Wara has higher yield conversion than coals in seam Tutupan and Paringin.
