The mineralogy, elemental composition, and modes of occurrence of 49 elements in nine
composite samples of Bobov Dol high-ash coals were studied by optical microscopy, scanning …

The mineral and inorganic chemical composition of five types of samples from the Pernik
subbituminous coals and their products generated from the Pernik preparation plant were …

The mineralogy, petrology, and geochemistry of submarine coals and petrified tree trunks
from the Sozopol Bay were investigated. The coals are lignites of Lower–Middle Miocene age. …

This paper presents the results of a detailed mineralogical and geochemical study on five
types of claystones from the Maritsa East lignite basin in Bulgaria. The studied samples of …

This work presents studies on the exogenic changes during storage of coal samples. These
changes are results of oxidizing and reducing processes. The studied coal samples are of …

The samples studied include raw coal from five mines, coal concentrate, coal slurry, associated
rock, and waste water. Collodetrinite comprises the dominant portion in raw coals and …

The phase-mineral composition of the feed coal (FC) from Maritza East lignite used in the
Maritza East 1 thermo-electric power station (TEPS) and lagooned ashes (LAs) generated from …

The contents of 49 trace elements in sub-bituminous Pernik coals and their waste products
from preparation and combustion processes were investigated. The studied coals have trace …

… The discrete phases with Fe–, Cu–, Fe>>Cu–, and Cu>>Sn– composition found in this study
were also reported in the previous study of Yossifova et al. [51]. These minerals incorporate …

This contribution presents the age of the detrital zircons from the coal bearing Miocene
succession of the Maritsa East lignite basin. We report a new finding of thin kaolinized pyroclastic …