Do I have a right to royalties? Existing Lease on Purchased Land

The purchase includes two 40 acre parcels, both of which have already been drilled and these drilling rigs/pumps (Not sure what they’re called) have been on the for 15 years now. The current owner inherited the parcels from his father and has no idea about how any of this works. The owner receives $1200 a year on a right of way agreement for just one parcel. For the other parcel, there is no record of any payment required. That’s it.

The current owner just wants the cash he will get from the sale. The owner doesn’t even know if they own the mineral rights or what royalties are.

As for the court house, I called county and found the previous deeds and there is no indication that the surface and mineral rights have been separated.

I will do a bit of research on how CO handles reserves and what rights owners have.