A search for a mother of two missing in the outback for six months has resumed, sparking a sweep of about 100 mine shafts.
South Australian police are also set to drain a dam as they look for Andamooka woman Trisha Graf, whose Ford Territory was found perched on a remote dirt mound on December 12.
Ms Graf, 41, left the Roxby Downs Hotel in her car at 12.19am on December 12, accompanied by a friend.
While driving towards Andamooka near Roxy Downs, her car was damaged in a collision with a kangaroo.
The pair continued their journey and visited a home in Andamooka, 600km north of Adelaide.
Ms Graf left that house just before 2am to travel the short distance to her home and she was last seen driving on Dunstan Drive.
Later that day, Ms Graf's partner and a friend found her car abandoned and unable to be driven near Blue Dam, east of the town.
Major Crime detectives, specialist officers, mounted police and State Emergency Service volunteers returned to the remote region on Monday searching east of Blue Dam towards Lake Torrens.
The dam will be drained and searched after a previous check by police divers was unable to eliminate the presence of evidence.
About 100 mine shafts will also be checked.
The disappearance of Ms Graf, who lived in Andamooka with her partner and two young children, was declared a major crime in January.
Multiple ground and aerial searches have failed to uncover any clues to her disappearance.
Major Crime Detective Superintendent Darren Fielke previously said Ms Graf's disappearance was "highly unusual and particularly out of character" and police held grave concerns for her welfare.
Anyone with information is urged to contact Crime Stoppers.
