BUT ... the landowner owns the space of a mine! So the shaft and passages belong to them, as well as any barren ground surrounding them.
So when Johnny Claimalot rubs his hands with glee after an old shaft opens up in his back garden, he better go and put his 'Wheres Theres Blame Theres A Claim' tee shirt back in the drawer, because he owns that shaft himself ?
STANDBY FOR ACTION!!!!...