Police have returned to Oak Park Station in South Australia’s Far North to continue their search for missing four-year-old Gus Lamont, who hasn’t been seen since September last year.

Task Force Horizon members, including STAR Group officers and Major Crime detectives, will search the property for evidence over the next three days, police said.

Any update to the investigation will be provided by police, an SA Police spokesman confirmed.

“The searching has resumed to take advantage of opportunities that may have arisen as a result of recent heavy rains on the property,” police.

The disappearance of Gus was declared a major crime in February this year with police saying a person living at Oak Park Station, which sits about 40 kilometres south of Yunta, was a suspect.

Before that, Detective Superintendent Darren Fielke said that on January 14 and January 15 police had executed a search warrant for the station homestead. Item seized included a vehicle, motorcycle and electronic devices.

All items were subject to forensic testing.

“We have a suspect who is known to Gus,” Fielke said.

“We don’t believe now that Gus is alive.”

The lawyer’s representing Gus’s grandparents released an official joint statement in February saying one grandparent, Josie Murray, had reportedly hired top Adelaide criminal lawyer Andrew Ey. His grandmother, Shannon Murray, has booked prominent defence lawyer Casey Isaacs, also from Adelaide.

It is common for witnesses to obtain legal advice and there is no suggestion of wrongdoing.

Gus Lamont was last seen by his grandmother playing on a mound of dirt at the sprawling sheep station in outback South Australia on September 27.

His disappearance from Oak Park Station sparked several intensive searches spanning almost 500 square kilometres by hundreds of police and volunteers using aerial support and mounted units.

SA Police aid that an update would be provided as the investigations continue.

Anyone with any information on Gus’s disappearance is urged to contact Crime stoppers online at crimestopperssa.com.au or on 1800 333 000.