機器
carbon
coal
coal mine
coal mine excavator
digger
digging
energy
engineering
environment
environmental
equipment
excavate
excavation
exploitation
extract
extraction
factory
fossil
fuel
geology
heavy
huge
industrial
industry
infrastructure
iron
layer
machines
mine workings
miner
mineral
mining
mining equipment
mining industry
mining machinery
open
opencast
openpit
ore
pollution
power
raw
raw material
reserve
resource
rotating
source
surface
wheel