Circumstances of Disappearance
Balken and her friend, Gillian Jamieson, were last seen at 19.30 on Saturday, June 12, 1980, leaving the Tollgate Hotel in Church Street, Parramatta, New South Wales, with a man dressed in dirty work clothes and wearing a floppy black cowboy-style hat.

Ninety minutes after the pair left the hotel, Balkan made a brief phone call to their fellow flatmate, Susan Gilchrist, saying they would not be home for a prearranged dinner and that they were in Wollongong.
They planned to hitchhike from Thirroul station, near Wollongong, to Sydney.

Neither of the women, who worked as nurses in Sydney, have been seen or heard from since that time.
They had a history of hitchhiking and experimenting with drugs.

Investigators
If you have any information concerning Balken's whereabouts, please contact:
New South Wales Police Service
02-9698-7388
You may remain anonymous when submitting information.

Source Information:
National Missing Persons Unit
The Sydney Morning Herald
The Daily Telegraph
NSW Police