Cadia Mine is a large open cut gold and copper mine located about 20 kilometres south of the regional city of Orange, New South Wales, Australia. The mine has been developed throughout the 1990s and is a major employer in the region with an expected lifespan of several decades. Cadia is the second largest open cut mine in Australia after Kalgoorlie. Large mineral deposits are also being uncovered from the more recently developed Ridgeway underground mine.