The crude petroleum and natural gas industry is made up of establishments engaged in operating oil and gas field properties. Such activities include exploration for crude petroleum and natural gas, drilling, completing and equipping wells, operation of separators, emulsion breakers, distilling equipment, and and all other activities necessary to making oil and gas marketable up to the point of shipment from the producing facility. This industry also includes the mining and extraction of oil from oil shale and oil sands, and the production of gas and hydrocarbon liquids through gasification, liquefaction, and pyrolysis of coal at the mine site.