The search for missing little boy Gus continues in mid-north South Australia today.

The four-year-old was last seen playing on his family's homestead, about 40km south of Yunta, at 5pm last Saturday.

Gus is described as Caucasian, with long, blonde, curly hair.

He was wearing a grey sun hat, a cobalt blue t-shirt with a yellow Minion character on the front, light grey long pants, and boots.

Police and emergency services have searched the area since Saturday night, but have not been able to find the boy.

Aerial searches have continued throughout the nights, while ground searches in daylight hours have included SES, trail bikes, ATVs, dogs, and a drone.

Water police and mounted police joined the search yesterday as it expanded to include dams and tanks on the property.

Gus's f

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