Landowners and oil companies sometimes have a need to not only know the ownership of the surface estate of land, but also need to know the ownership of mineral interest and royalty interest. The mineral estate is often severed from the surface estate, such that the ownership of minerals and royalty is different than the ownership of the surface. Sometimes the ownership of the royalty interest is different from the mineral interest from which a royalty estate has been severed. Title opinions and title examinations for oil and gas title is a specialty within the field of title law. David Ringer typically handles this type of work.