The disappearance of four-year-old August ‘Gus’ Lamont has devastated a remote South Australian community and captured national attention — but nearly six weeks on, there’s still no sign of the little blond boy.

Gus was last seen around 5pm on September 27 , playing outside the Oak Park homestead while his grandmother cared for his younger brother Ronnie inside.

His mother and grandfather were out tending sheep on the family’s 6,000-hectare property, 43km south of Yunta.

The terrain is brutal — arid, rocky,vast and unforgiving to most living creatures.

Nina Siversten, an expert in human physiology from Flinders University, said Gus could’ve travelled outside the search zone.

“Over a three-day period, we’re looking at potentially three to eight kilometres,” she told 7NEWS.

Gus has

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