ABSTRACT
Changes of coal quality parameters near a fault plane were studied, Research was carried out for the Klodnicki fault system – main disjunctive structure of the Upper Silesian Coal Basin, Poland. Three types of coal quality changes were distinguished. The first one is characteristic for weathering of coal in a fault zone. The second oneis typical for coalification involved by a frictional heat generated during fault propagation. Near the faults of small size no regular changes of coal quality were noticed.
