Establishments primarily engaged in operating oil and gas field properties. Such activities may include exploration for crude petroleum and natural gas; drilling, completing, and equipping wells; operation of separators, emulsion breakers, desilting equipment, and field gathering lines for crude petroleum; and all other activities in the preparation of oil and gas up to the point of shipment from …
Examples: Coal gasification at the mine site, Coal liquefaction at the mine site, Coal pyrolysis at the mine site, Crude oil
