An extremely important (my opinion) element in a sales transaction of mineral rights is the language used in a conveyance document, aka, a deed.
While it may be that this situation happens in multiple states, I know it happens often in Texas, and I believe this may have been through the courts already, and thus still allowed.
The “situation” is that of a buyer including “county wide” language in the legal description of what is being conveyed. The effect, often overlooked by a seller, is that in addition to any specific legal description of the lands being conveyed, the deed sweeps up and divests of any minerals the person may own in the entire county. You can only imagine that at times, this involves lots and lots of money. It’s a tragedy when this happens, and more so, often the seller is never the wiser. They don’t even know what happened to them.
Perhaps someone who knows how this is allowed to happen in TX can comment.