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In this paper the results of sedimentological analysis of coal in 2010 at the lokality Petka (western coal basin Kostolac). Are presented variations of petrographic composition of coal matter (lithotypes, microlithotypes and macerals), mineral admixtures (clay, aleurite and marl) and locally occurring epigenetic mineralizations. The Kostolac Neogene Basin (Figure 1), cont aining three tick lignite beds of Pontian age[1] is one of important energetic resources of Serbia and is the bases for operating two lignite-fi...