An old mine is being excavated in a new police search for a teenager who went missing more than 20 years ago in a South Australian outback town.
Karen Williams, 16, was last seen in Dawes Street, Coober Pedy, in the early hours of August 4, 1990.
Police say she had been with friends at the Opal Inn and at Sergio's Restaurant, before she was allegedly dropped off by a young local man in Dawes Street.
On Wednesday, police said new information had sparked the new search involving the excavation of an old mine shaft.
The teenager's disappearance was featured on Network Ten's crime show Wanted, resulting in five phone calls to Crime Stoppers.