Deeds convey and/or reserve minerals. Anything related to minerals would be stated in the deeds you hold.
A "what if" - Let's say these people later contact you for anything surface-related, i.e., easements/right-of-ways. Personally speaking, I would hire Mr. Buddy Cotton (a Forum member) to represent me. There are many issues to negotiate when one is a surface owner and "up against Goliath,", ex., roads, reclamation, maintenance, access, restrictions and uses, abandonment, temporary impositions, how much you should get paid, liability, etc., etc.
You can still hold the reins here ... if you have a "tight" Surface Agreement.
Surface Agreements can cover a lot of ground ... no pun intended.