Why would anyone buy property without access to a public road? Because it seemed like a good idea at the time, I guess. And often it is, until things change, “things” often being new and unfriendly ownership of the surrounding property. The Texas Supreme Court has addressed this situation. Hamrick v. Ward clarified the law
When an Easement Isn’t What it Appears To Be
Here is Something We Know
A Texas mineral estate owner has an implied easement for reasonable use of the surface estate in developing and extracting the minerals below.
And a Question
Can the mineral estate owner and his lessee use the easement to produce from a mineral estate that is pooled with the surface estate?