Stock Photo: Maritsa Iztok is the largest coalmine in Bulgaria The coals are located 60 meter underground and the layer of coal is around 20 meter The coals are used for generating electricity by burning them The coalmine provides 85 of the country´s energy The US is

Stock Photo: 1566-979952 Maritsa Iztok is the largest coalmine in Bulgaria The coals are located 60 meter underground and the layer of coal is around 20 meter The coals are used for generating electricity by burning them The coalmine provides 85 of the country´s energy The US is