New SA Police search for missing Andamooka mother Trisha Graf

A woman with blonde hair and tattoos on her arm wearing a black singlet smiles while sitting at a bar

Trisha Graf was last seen on December 12. (Supplied: SA Police)

SA Police have returned to the outback town of Andamooka to search for missing local woman Trisha Graf.

Ms Graf, 41, was last seen driving in the town, about 600 kilometres north of Adelaide, in the early hours of December 12 last year.

The next day, her car was found abandoned near Blue Dam, about 4 kilometres east of Andamooka.

Police say investigators will search for evidence on the western fringe of Andamooka “over the next few days”.

Police have conducted several searches over the past five months looking for the mother-of-two.

Several officers with metal detectors going over disturbed earth

Police search mine shafts and disused opal diggings in March. (Supplied: SA Police)

Most recently, in March, they seized a car and searched locations including mine shafts and disused opal diggings.

Police say Ms Graf went to the Roxby Downs Hotel with a friend on the night of December 11 and was last seen there at 12:19am.

The pair then drove back to Andamooka, hitting a kangaroo on the way but continuing to the smaller town.

Ms Graf left her friend’s house just before 2am and was last seen driving along Dunstan Drive, in Andamooka.

Ms Graf’s partner and a friend found her car immobilised on a mound near Blue Dam about midday on December 12.

A photos of a white four wheel drive car with a damaged front end stuck on top of a mound of dirt on a projector.

Trisha Graf’s car, which was located damaged from a collision with a kangaroo and immobilised on a mound at Blue Dam. (ABC News: Carl Saville)

Her disappearance was declared a major crime on January 6.

Police have asked anyone with information about Ms Graf’s whereabouts or her movements leading up to her disappearance to contact Crime Stoppers on 1800 333 000 or online at www.crimestopperssa.com.au.