Hasil Kajian: Chemical Analysis to Determine Coal Rank in Ombrob Village Coal Deposits, Nimboran District, Jayapura Regency, Papua

Most of the coal in Papua has two tendencies. The first in quantity aspect that it is formed with thin seams. Secondly, in quality aspect that it has a low rank. This study aims to determine the chemical characteristics and rank of coal from coal deposits in Ombrob Village, Nimboran District, Jayapura Regency, Papua. Three samples were obtained from the results of field investigations namely OBB-1, OBB-2 and OBB-3 which were then analyzed at the Bandung Tekmira Lab using the proximate, ultimate and calorific value analysis methods. Based on the analysis results from the laboratory, the results of the analysis were for the OBB-1 sample: moisture content 25.98% (adb), ash 17.06% (adb), volatile matter 35.65% (adb), fixed carbon 21.31% (adb), carbon 38.26% ( adb), hydrogen 5.72% (adb), nitrogen 0.76% (adb), total sulfur 4.36 (adb), oxygen 33.84% (adb).....Based on the analysis of the three samples, the rank of Kampung Ombrob's coal deposits is lignite. The results of this research are expected to contribute to the exploration and inventory of coal resources in the Jayapura and Papua regions.