Kolubara coal basin is located in the west part of Sumadija, between Rudovci (east), Koceljeva (west), Stepojevac (north) and Slovac (south) and it expands over the area of about 600 square kilometres. The basin is east-west oriented, 55 kilometres long and 16 kilometres wide.

Kolubara open cast mines produce about 75 percent of lignite in Serbia.

Nowadays coal is being excavated at four active mines: “Field B", “Field D", “Tamnava- West Field" and “Veliki Crljeni". During operation, these four mines that cover about 80 square kilometres in the area of municipalities of Lazarevac, Lajkovac and Ub comprise one technological and production unit. Coal from open cast mines “Field B" and “Field D" is processed in coal refinement and separation units in Vreoci, while the coal from “Tamnava-West Field" and “Veliki Crljeni" is crushed and assorted in Crushing Plant in OCM “Tamnava-West Field“. Coal is being used for the needs of thermal power plants “Nikola Tesla" in Obrenovac, “Kolubara A" in Veliki Crljeni and “Morava" in Svilajnac, as well as for industrial and mass consumption.

Kolubara coal basin is about 40 kilometres far from Thermal Power Plant Nikola Tesla (TENT).

Kostolac coal basin

Coal deposit “Drmno" is located in the east part of Kostolac coal basin, i.e. east of the River Mlava and it covers the area of about 50 square kilometres.

Kostolac basin produces 25 percent of lignite in Serbia and supplies thermal power plant “Kostolac“.

East and south borders of the deposit are natural, i.e. defined by the geological conditions. The north border of deposit is the River Danube, even though coal seam continuously expands below Danube and into deposit Kovin.

Kostolac coal basin is in the vicinity of thermal power plants “Kostolac A“ and “Kostolac B“.