In this chapter:
(1) "Gas" includes all liquid hydrocarbons in the gaseous phase in the reservoir.
(2) "Land" includes minerals or an interest in minerals in place.
(3) "Mineral development" includes exploration for, whether by geophysical or other means, drilling for, mining for, development of, operations in connection with, production of, and saving of oil, other liquid hydrocarbons, gas, gaseous elements, sulphur, metals, and all other minerals, whether solid or otherwise.
(4) "Property" includes land, minerals in place, whether solid, liquid, or gaseous, and an interest of any kind in the property, including a royalty interest, owned by an estate.