Depositional model are a substantial way to to achieve a better understanding about coal properties and seam characteristics. There are many ways to interpret depositional models, one of them is by analysing macerals of the coal obtained from the core. Tissue Preservation Index (TPI) and Gelification Index (GI) plotted in the formula of Diessel (1986) to know the depositional environment. Maceral group observed from coal in Banko Barat show dominant Vitrinteecontent such as teloVitrinte and detroVitrinte. Cutinite and Resinite appear as a part of Liptinit while Funginit-Semifusinit as a part of Inertinite. These group of maceral was a character of Tertiary Coal Seam. High value of Vitrinte and Lower percentage of liptinite/Inertinite indicate that peat swamp in research area was situated in unstable basin between upper delta plain and lower delta plain. Thus, the depositional environment shifted, causing mineral matter filling in the coal. From the TPI versus GI formula, depositional environment achieved and show that the coal seams were deposited primarily in a Limited Influx Clastic Marsh. At some point, depositional environmental change to Limno Telmatic and Wet Forest Swamp. TPI values from research area varied ranging from 0,022 to 3,36. On the other hand, GI value of the coal ranged from 11,54 to 79,58. These are happened as the effect of high content of Vitrinte Maceral (approximately 89,72%) and Low content of Inertinite (about 3,91%).