environmental
abandoned
acid
blue
deserted
drainage
environment
geological
geology
industrial
industry
lake
landscape
maroon
mertola
mine
mineral
mining camp
mining industry
nobody
old
open cast
opencast
opencut
openpit
ore
outdoors
outflow
pit
pollution
portugal
puddle
pyrite
red
reflection
residues
rock
runoff
sao domingos
site
stone
sulfide
water