I finally found some future/secret mines in the Prison world! They must be upcoming Free/Citizen/Vet/Legend mines, or at least I hope! I got some brief screenshots from freecamming. Here are some photos! If you want to find out where these mines are so you can take a look yourself, just /msg me in-game! I'm sorry, staff, if you were trying to hide these, but I found them
It has knockback X so hit them they go back into it and tpa to them, that is what happened to me today.