The Seyitomer basin, which is one of the most productive coal basins of western
Anatolia-Turkey, contains two seams, lower and upper, in the Lower-Middle Miocene
lacustrine Seyitomer Formation. The lower seam in this basin is only extensively
exploited by open-cast methods and produced lignites are mainly consumed in coal-
fired power plants. A total of thirty-six lignite samples, of which thirty-one are from
the lower seam and five from the upper seam, were collected from the two locations
(DK and S30), and have been subjected to chemical and petrographic analyses. The
chemical analyses of the coal ash samples with XRF show that the lignite samples
on a whole-coal basis are enriched for Cr and especially Ni, and Bi, Co, Cu, Mo, Sc
and V, and also exceed the range values of the most world coals. The most abundant
maceral group of all the samples is huminite, in which textinite, ulminite and especially
densinite are rich. Liptinite group macerals in all the samples, which are considerably
higher than the inertinite group macerals, include mainly sporinite and liptodetrinite.
The mean values of maximum reflectance (av. 0.29%) in oil of ulminite from the
lignite samples in the Seyitomer Basin show a lignite stage (soft brown coal) in rank.
In addition, vertical variations of some results in the two lignite seams have been
also considered in this study.