 Complete the following phrase:  Uranium mining has occurred in South Australia, since the early 20th century, when radium was the target mineral in uranium-bearing ore. During the Cold War, the Playford government facilitated the development of the Radium Hill uranium mine and the associated Port Pirie uranium treatment complex. These closed in the early 1960s after a seven-year contract of supply had been fulfilled. In the 1970s, the discovery of a massive uranium-bearing IOCG orebody near Roxby Downs led to the eventual opening of the Olympic Dam mine in 1988. In the 2000s, the sector expanded to include in-situ leach mining operations at Beverley, Four Mile and Honeymoon. As of May 2016, Beverley and Honeymoon mines are in care and maintece mode owing to weak uranium prices in the wake of the 