would be nice to have a refillable item in the mines that lasted a long time.
camp fires are nice in the mine but don't last very long.
hopefully a pretty easy and cheap to make fuel source so even newbies can come down and refill it while they are doing what ever in there to get the mine set up for the higher level players to mine and such.
if a mining lamp then maybe make it so it can only be hung on the ladder and/or mine supports.