(5) “natural resources” includes water, coal or other minerals, oil or gas, and geothermal systems; in this paragraph,
- (A) “coal” means all forms of coal, including lignite;
- (B) “gas” includes all natural gas and all hydrocarbons produced at the wellhead that are not oil;
- (C) “geothermal system” means a stratum, pool, reservoir, or other geologic formation containing geothermal resources;
- (D) “oil” includes crude petroleum oil and other hydrocarbons regardless of gravity that are produced at the wellhead in liquid form and the liquid hydrocarbons known as distillate or condensate recovered or extracted from gas, other than gas produced in association with oil and commonly known as casinghead gas;
- (E) “other minerals” means clay, stone, sand, gravel, metalliferous and non-metalliferous ores, and other solid materials or substances of commercial value excavated in solid form from natural deposits on or in the earth; “other minerals” does not include coal or minerals that occur naturally in liquid or gaseous forms;