DANGER! Abandoned mine. Stay out, stay alive. Actually, we did go inside (shh) and found it to be...
a nice cave with tunnels and bats. Didn't stay long though. Many of these mines go straight down, down, down a dangerously vertical 30, 40, 50 feet but this one was horizontal making it quite enticing to enter. Interestingly, the fencing around the dangerous ones is the same as this one, sort of lax and easily crossed over/under, whatever.