A fresh search for missing four-year-old Gus Lamont on a remote South Australian cattle station has failed to uncover any trace of the little boy.
Major crime detectives and specialist officers have spent the past three days combing Oak Park Station in the state's outback, returning to the property in the hope downpours exposed new evidence.
Officers from Task Force Horizon began the latest search on Monday, targeting numerous locations across the vast station, including areas where rain and erosion could have shifted soil or cleared vegetation.
"Unfortunately, we have not uncovered any further evidence that helps us locate Gus," Detective Superintendent Darren Fielke said on Thursday.
"Task Force Horizon members on the property, together with STAR Group officers — up to 17 people over the past three days — have searched all of these areas in an effort to uncover new evidence or information that might help us locate Gus.