Police say they are confident they have done all they can in the search for missing four-year-old Gus Lamont and have revealed a footprint found in the search last week is now deemed unrelated to the investigation.

Gus was last seen playing on a mound of dirt about 5pm on Saturday, September 27 by his grandmother at the family's Oak Park Station homestead, about 43km from the town of Yunta in South Australia.

By 5.30pm, Gus – who has been described as shy but adventurous – had vanished and a full-scale ground and air search of the property and surrounding area was launched.

SA Police Assistant Commissioner Ian Parrott said the search for Gus would be scaled back from today and the investigation woulsd be managed by the Missing Persons Investigation Section.

"We are confident that we

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