ABSTRACTudThe investigation about coal deposits in Polman Regency of West Sulawesi Province has been conducted with the aim to characterize and to make a better understanding its occurrence in sedimentary sequence of Mandar Formation. Characterization of some coal samples were mainly for their petrographic and quality. The result of microscopic analysis showed that vitrinite was dominant maceral group ranging from 93.4 to 98.6 vol. %. It was followed by inertinite group (1.2 ??? 3.0 %). Liptinite was only present as trace amount. Mineral matters content for all samples analysed were also small, ranging from 1,0 to 3,0 %. Reflectance vitrinite measurement resulting of 0.56 to 0.60 % indicated that deposits include as high volatile bituminous coal. The proximate analysis for seven samples were as follow (% adb): inherent moisture 16.73 ??? 25.38 ; ash content ranges between 5,50 and 18,50 ; volatile matter 25,45 ??? 32,73 and fixed carbon 33,68 ??? 41,82. The heating value is around of 4248 to 5168 kcal/kg and total sulphur content ranges from 0,50 ??? 1,20 %. Almost all coal seams occur as discrete thin layers or lenses with the thickness approximately of 0,5 to 15 cm. Based on the field examination and laboratory analyses, it can be inferred that coal deposits observed formed in-situ through a humification process within unstable mire and the coal precursor (vegetation debris) was very restricted.
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