機器
abraum
cave
chemical
chloride
concentration
conveyor
corridor
crystal
deep
deposit
depth
dig
equipment
fertilizer
fossil
gallery
geology
ground
industrial
industry
line
material
mine
mineral
mining
ore
plant
potassium
production
quarry
resource
rock
salt
service
sodium
step
stone
sylvinite
technology
texture
transportation
tunnel
underground
way