belt
black
burning
carbon
cart
coal
conveyor
dig
dump
electric
energy
excavator
explode
exploitation
extraction
factory
fire
fossil
fuel
gas
glyph
heat
hole
hot
icon
illustration
industrial
industry
layer
lignite
line
machinery
manufacturing
material
mine
mineral
mining
natural
plant
power
process
production
resource
rock
sign
stone
survey
symbol
truck