black
burning
central
coal
concept
dark
deposit
ecology
effect
energy
environment
exploitation
extract
extraction
fossil
fuel
gas
hand
heat
hold
hot
human
industry
lignite
man
manufacturing
material
metallurgical
miner
mineral
mining
nature
part
power
processing
production
protection
resourses
rock
source
station
stone
sunlit
underground
work
worker
定額
Coal mining - hand holding sunlit dark coal stone part. Concept coal mining, coal processing, energy
source, environment protection.の素材 [FY31085930694]
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