Police and the Australian Defence Force are launching an expanded search for missing four-year-old boy Gus on his family's station in South Australia's mid-north.

Police said the search will resume today at the family's isolated and undulating sheep grazing station, about 350km north of Adelaide.

They said the search would "concentrate on an expanded area outside the zone already searched extensively" in the days after Gus vanished on Saturday, September 27 .

He was last seen playing about 5pm on a mound of dirt outside the homestead on the property, which spans about 6,000 hectares and is located about 43km south of Yunta.

Gus's family contacted authorities about three hours later.

Initial searches for the boy involved police, SES, the ADF, a tracker and community volunteers wh

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