In much of west Texas, the surface and mineral estates have been severed. An owner can only sell you what he owns. A common phrase in deeds is that seller grants buyer "all my right, title and interest in X tract of land" and that does not guarantee minerals. Some deeds are more specific and note that only surface (or mineral) rights are being transferred. Unfortunately, this is a common experience of many buyers who purchase land and either assume or are told that there are some or all of the minerals included. To determine mineral rights, you have to research all the deeds in your chain of title to see whether some or all of the minerals were severed at some point over the years. The county itself will not research this point for you. It is the same issue with whether you receive 100% or some fractional interest in the surface. If you own surface, you will be paying property taxes on it. So again, paying taxes does not tell you if you own any minerals. You should find out where in the section your surface is located and whether you own all or a fraction of that tract. If your surface is used for a drilling location or for ROW for pipeline, electric line or road, then you will be owed damages. Perhaps you can contact your seller and ask him to refund your purchase price and take back the property.