Well, as you know "always" is hardly every the correct answer as there seems to be always an exception to the rule. The reservation of mineral rights by previous owners can become meaningful, but in most cases, those who reserved mineral rights may not have reserved the necessary rights to get access to the mineral rights. It's one thing to own mineral rights, it's another thing to have the right to go on the property to get to the minerals. This is important because buyers of property that don't come with mineral rights or only with mineral rights up to a certain depth are usually worried about someone knocking on their door saying that they want to start mining operations. I would always recommend that a buyer contact the title research department and discuss any concerns they may have concerning mineral rights.