August "Gus" Lamont disappeared from his family's remote South Australian homestead, approximately 40 kilometres south of Yunta, on the evening of 27 September 2025. Five months later, police have returned to the remote station, with officers from Task Force Horizon searching for evidence at Oak Park Station this week.
The scale of the investigation reflects the gravity of the case. The search for Gus Lamont is the largest and most intensive ever carried out by South Australia police with regard to a missing person, involving 163 state police officers and 230 personnel from other services including the SES, the ADF, First Nations trackers, and community volunteers.
What happened to Gus remains a mystery. Gus was reportedly last seen outside by his grandmother around 5:00 pm on 27 September 2025, playing on a mound of dirt. At 5:30 pm she went outside to call him in, only to find him missing. After searching for Gus themselves, his family contacted police at about 8:30pm. Officers arrived at the outback property about 9:30pm.
The early stages of the investigation focused on the most straightforward possibility: that Gus had simply wandered away from the remote property. Despite extraordinary efforts through all combined searches, investigators found no evidence, physical or otherwise, to suggest Gus has wandered off. Police say they have ruled out Gus wandering off and child abduction. They have discounted neighbours, workers, known child sex offenders and vehicles in the area.
The isolation of Oak Park Station itself suggested abduction was implausible. Detective Superintendent Darren Fielke described Oak Park Station as uniquely isolated. It is 45 kilometres inland, accessible only by two dirt roads, with locked gates and no foreign tracks detected. "With what I've just explained about the remoteness of the property, the opportunity for anybody to abduct Gus is extremely low," he said.
By early February, investigators had narrowed their focus sharply. On 5 February 2026, SAPOL declared the disappearance a major crime, with a resident of the sheep station known to Lamont identified as a suspect. When asked whether someone known to Gus had killed him "either deliberately or accidentally", Detective Superintendent Fielke responded: "Yes, that is what is being explored. We don't believe now that Gus is alive."
Yet despite the declaration and the identification of a suspect, no charges have been laid. Investigators searched the homestead on January 14 and 15, seizing items including a vehicle, a motorcycle and electronic devices for forensic testing. They have not revealed what evidence underpins their theory, but clearly crucial evidence remains elusive.
The case has created complications within the family itself. Police ruled out Lamont's parents as suspects, and said the timeline of events given by the suspect was inconsistent with the timelines given by others. Police have emphasised Gus's parents are not suspects. "We are still getting significant assistance from Gus's mum and dad," SAPOL Commissioner Grant Stevens said.
The investigation continues on uncertain footing. "That is not a simple investigation," the major crime chief said. "We're exploring all avenues to do with locating Gus. Nothing is off the table." Despite months of exhaustive searching, neither Gus's remains or his clothing have been located.
For anyone with information, Crime Stoppers can be contacted on 1800 333 000.