structural:scholar_edition, information:classification
If the landowner owns everything beneath the ground on his property, he may convey to another party the rights to mineral deposits under the land and other things requiring excavation, such as easements for buried conduits or for water wells. However, such a conveyance requires the recipient to prevent any damage to the surface of the land caused by the excavation unless the conveyance itself grants express authority for the surface land to be damaged, "as reasonably necessary" for the recipient to exercise his extraction rights.