That mineral rights issue sounds like someone from your state might be able to help, whomever you had title insurance through when it was purchased could possibly be of help too. Here in SC, a real estate lawyer is required for the transaction, in theory this should be a big help if issues arise. My current issue isn't about mineral rights but rather with access off our private road. The (Illegally) self appointed HOA president insists we don't have access, and this is all of the sudden too as of ~2/22 when we've been using the same drive that existed before we bought the property in May '18 then put down gravel in early '19. This was thoroughly vetted through the previous HOA president, a half dozen transfers identifying access in the same language and verbally by "Tim" from the county called on our behalf by the former HOA president. It became obvious we needed a lawyer to iron out this mess for us even before we found out the current prez is being sued by his neighbor for tearing up their tree lawn. My wife last year electively enrolled in a company sponsored (but not free) LegalEASE program, basically insurance covering the cost of an attorney for a variety of different needs, real estate included. The guy we were assigned was great right out of the door, communicating quickly and did a lot of research for us further locking down our case. We hesitated to have a letter sent to the developer (who appears to have been completely out of the picture for several years) and the problem prez until we knew what everyone's intentions were. Well, the prez mowed down a bunch of trees on the our tree lawn and put access limiting rocks on our driveway. I was displeased to say the least so we gave the lawyer the go ahead to put together a letter for us to review then send it. He ghosted us. Zero communication for about six weeks despite multiple attempts to get in touch. My wife finally did via phone call and he's promised us something 3 or 4 times now and failed to deliver every time. She's been in touch with HR who was pitching this program and LegalEASE directly, neither has been much help and we could be staring down the barrel of having to involve yet another lawyer at a completely unknown expense to deal with this issue and possibly the ghosting lawyer as well if he demands payment for service he's failed to deliver.
The short and skinny of it is to make sure you get the right people to get your mineral rights situation figured out, getting almost the right people can double your headache pretty quick!