機器
big
cast
coal
construction
copper
crater
diamond
dig
dirt
earth
ecology
environment
equipment
excavate
excavation
exploration
geology
giant
gold
ground
heavy
hole
industrial
industry
iron
landscape
large
layers
machinery
mine
mineral
minerals
mines
mining
open
ore
pit
precious
quarry
resources
rock
silver
smoke
stone
surface
terrace
truck
vehicle
work