Olympic Dam is a large mine in South Australia that extracts copper, uranium, gold, and silver. It is one of the largest copper and uranium mines in the world. The mine employs over 4,000 people and includes both an open pit and underground shaft mine reaching 850 meters deep. BHP Billiton aims to greatly expand operations to extract over 60 million tonnes of ore annually, which would significantly increase production, transportation, and employment at the mine.