South Australian Police have wrapped up another search for missing four-year-old Gus Lamont after failing to find any trace of him in outback mine shafts.

Gus vanished from his family’s sheep farm at Oak Park station in South Australia’s outback back on September 27.

STAR Group and Task Force Horizon officers inspected six mine shafts between 5.5km and 12km from the Lamont family’s homestead, along with several other sites identified through aerial mapping.

According to police, some mine shafts were shallow enough to be checked visually, while others had officers scaling more than 20 metres into the shafts with specialised equipment.

The latest search was planned for three days at Oak Park station, however it ended on its first day with investigators confirming the searches did not locate any further evidence.

Deputy Commissioner Linda Williams said on Monday the latest operation was designed to either uncover evidence or rule out the shafts entirely.

The mine shaft search has finished with no further clues into August Lamont’s disappearanceThe mine shaft search has finished with no further clues into August Lamont’s disappearance Credit: SAPOL Oak Park Station at Yunta.Oak Park Station at Yunta. Credit: 7NEWS

August Lamont vanished on September 27 while playing outside the family’s home on the property, sparking one of the largest search operations in the South Australian history.

Oak Park Station is about 6,000 hectares, with the conditions of the station being extremely dry and arid.

Search crews have already drained a dam, combed 470sqkm of rugged terrain and battled scorching heat.

The only clue remains a single footprint found days after he disappeared.

Police Commissioner Grant Stevens previously admitted the case was difficult, saying there are “lots of places a small child might find themselves which are hard to identify.”

The family has been advised of the results and continues to receive support.

Task Force Horizon officers have not ruled out returning to the property as the investigation continues.

Despite exhaustive searches, police remain no closer to finding Gus.

Gus is described as having long curly blond hair and was wearing a blue long-sleeved Minions T-shirt, a grey sun hat and boots when he went missing.

Police continue to work on the theory that he may have wandered off, but with no access to water, food or shelter, survival is considered unlikely.

Authorities say they remain committed to finding Gus, urging anyone with information to contact police.

SOURCE: https://7news.com.au/news/gus-lamont-disappearance-mine-shaft-search-ends-with-no-clues-for-missing-outback-boy-c-20800522