abandoned
aged
area
caution
cave
cavern
collapse
damaged
danger
dangerous
dark
deep
dirt
enter
entrance
fear
forbidden
forboding
gold
grunge
hazard
hazardous
inside
keep
mine
miner
minerals
mines
mineshaft
old
out
painted
passage
prospecting
protection
retro
rock
safety
security
shaft
sign
tunnel
underground
underneath
unsafe
vintage
warning
weathered
wood
wooden