Petrographic analysis of hard coal in grain class <1mm

There are presented results of petrographic analysis of the finest class of hard coal (<1mm). Examined Medium-Rank coals-orthobituminous C-came from four seams of western part of Upper Silesian Coal Basin. The coal samples have been obtained from froth flotation in processing plant. Microscopic analysis comprised defining of vitrinite reflectance and determining of percentage of maceral groups and group of microlithotypes. Petrographic characteristic of examined coals enable to count them to high-vitrinite coals with vitrinite content V = 22-88%vol., low liptinite content L = 2-3%vol. and medium inertinite content I = 3-11%vol. (where the most often semifusinite and inertodetrinite occurred). The highest content of mineral matter (72%vol.), carbominerites and rock have been stated obviously in tailings. Concerning grain size (<1 mm) detailed determining of the art of mineral matter using microscope in transferring light was impossible-there were distinguished only quartz and feldspars. There was mostly approved occurring of isolated macerals. Too fine granulation (<1mm) did not allow to conduct combine analysis, because grain size classified counting mainly as mentioned 'isolated' macerals or 'on the border of the grain'. The amount of sections of the net did not allow to distinguish microlithotypes, among which there was only possibility to observe vitrite as 'observed' microlitothype.