cargo
carriage
cart
carts
cave
coal
dig
digger
digging
equipment
excavation
extraction
flat
freight
geology
gold
goldmine
ground
heavy
illustration
industry
jewel
job
load
metal
mine
miner
mining
money
mountain
mountains
object
ore
rail
rails
railway
resource
rich
rock
stone
tool
transportation
treasure
trolley
tunnel
underground
wagon
work
yellow