Footprint found in South Australian outback search for four-year-old boy

August, known as Gus, disappeared from his family's sheep station in state's remote mid-north on Saturday afternoon

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The discovery of a footprint is providing a glimmer of hope before the search for a preschooler on an outback homestead becomes a recovery operation.

Four-year-old August, known as Gus, disappeared from his family's sheep station in the remote South Australian mid-north on Saturday afternoon.