At 625 degrees C the percentage of sulfur in the non-volatile portion of the Bapung coal beds ranges from 1.08 to 3.10 wt.%, with the pyritic sulfur ranging from 0.02 to 0.32 wt.%, the sulfate sulfur ranges from 0.02 to 0.30 wt.%, and the organic sulfur from 0.88 to 2.49 wt.%. The total sulfur in the Bapung coal ranges from 2.50 to 12.44%. Organic sulfur appears to be more abundant among the different sulfur species. However, the pyritic sulfur increases quickly as the total sulfur content increases at 925 degrees C, the percentage of sulfur in non-volatile portion ranges from 1.27 to 2.54 wt.%, with pyritic sulfur ranging from 0.02 to 0.56 wt.%, sulfate sulfur ranges from 0.04 to 0.16 wt.%, and the organic sulfur from 1.15 to 2.03 wt.%.