Fears continue to grow over the welfare of missing 59-year-old Cleve man Daryl Norris, who left his home address nearly a week ago and has not been seen since.
Searches have been conducted within the township and the surrounding area by Cleve police with additional officers from Whyalla and Port Augusta along with State Emergency Service (SES) and Country Fire Service (CFS) volunteers.
The searches were concentrated on a 3.6 kilometre radius around Cleve and have been aided by drones, police helicopter (PolAir) and civilian fixed wing aircraft as well as STAR Group Field Search Controllers.
Efforts to locate Mr Norris have so far been unsuccessful but the missing persons investigation into his disappearance remains ongoing and police are continuing to search the wider region for him.
Mr Norris is described as being Caucasian, 183cm tall, slim build with blue eyes and brown/grey hair. He walks with a limp and was last seen wearing brown cargo shorts and a t-shirt.
Police believe Mr Norris left on foot at 8:30pm on Tuesday, February 4 with some food supplies but without any personal items such as a mobile phone or wallet.
Mr Norris, a loved family man, had not advised family or any close friends about where he was going.
Operations Inspector Mark Hubbard said there have been no confirmed sittings of Mr Norris and it was possible he could have fallen and injured himself and be requiring medical attention.
"Police have real concerns for his welfare as Mr Norris suffers from a medical condition and his family have not heard from him since he left on Tuesday evening," he said.
"We are determined to do everything possible to locate Mr Norris and return him to his family. We have committed substantial resources to this search in the hope of finding him."
Mr Hubbard said the circumstances around Mr Norris's disappearance were not considered suspicious, given he would occasionally leave home for walks for up to a day.
"In this case family became extremely concerned after he did not return and that's when police and emergency services got involved," he said.
"We're keeping an open mind, it's possible he is choosing not to be found, but given the passage of time we are very concerned."
Anyone with information that may assist in locating Mr Norris is urged to call the Police Assistance Line on 131444 or Crime Stoppers on 1800 333 000.