This study aims to analyze the geological conditions, coal depositional environments, and their influence on coal quality within the mining concession area (IUP) of PT Devanadi Karunia Cahaya in Batang Hari Regency, Jambi Province. The study area is located in a coal-producing region of Jambi Province characterized by diverse geological conditions and depositional environments, which influence coal quality. The research methods employed include geomorphological and stratigraphic analysis; lithofacies analysis based on the Horne (1978) classification; maceral analysis using Tissue Preservation Index–Gelification Index (TPI–GI) and Ground Water Index–Vegetation Index (GWI–VI) diagrams (Diessel, 1986), and proximate and calorific value analyses to determine coal quality. The results indicate that the study area's geomorphology comprises several morphological forms: moderately undulating plains, denudational lowlands, mine slopes, water catchment ponds (sumps), and mine openings. The stratigraphy consists of claystone and sandstone units of the Muara Enim Formation, a claystone unit of the Kasai Formation, and alluvial deposits. Based on lithofacies and maceral analyses, the coal in the study area was deposited in a Transitional Lower Delta Plain environment dominated by freshwater (limnic) swamps. This depositional environment produced Sub-bituminous B rank coal with very low ash and sulfur contents. These conditions indicate that the coal formation process occurred with relatively minimal influence from seawater or clastic sediment input. Thus, the freshwater swamp depositional environment positively influenced coal quality, particularly by resulting in low ash and sulfur levels.
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