Coal mining
Palabras clave
anthracite,
blade,
brown,
coal,
collier,
combustion,
current,
shoveling,
digging,
dredge,
dungeon,
energy,
engineering,
equipment,
shoveling,
exploitation,
factory,
fuel,
generation,
geology,
horizontal,
industry,
machine,
machinery,
man,
material,
mine,
miner,
mineral,
mining,
open,
ore,
pit,
power,
raw,
rock,
rotating,
science,
sinker,
source,
surface,
underground,
wheel,
workings
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