My dad is 70 this yr and 2 years ago he was surprised when he started receiving cheques for royalties on a long abandoned but recently re-opened natural gas well that he didn't even know about. It turns out that my grandfather, who died in 1970, and his brother somehow acquired mineral rights to this quarter section of land. My dad and his 2 siblings and their cousin have to date split about $90K. The cheques are very irregular in timing and amount, but a nice surprise every time one shows up. Dad doesn't need the cash, but he has a motorhome that gets about 9 mpg that goes to Arizona every year. He did a bit of research and it would seem that at least in Canada, a land owner can no longer buy mineral rights.