coal mine with a Bucket-wheel excavator
Palabras clave
coal,
coal cellar,
belt,
brown,
bucket,
construction,
conveyer,
shoveling,
energy,
equipment,
shoveling,
factory,
fossil,
fuel,
geology,
heat,
huge,
machine,
material,
mining,
open,
pit,
pollution,
production,
quarry,
rock,
stack,
technology,
tower,
wheel