South Australian police investigating the disappearance of four-year-old Gus in the state's mid-north are hoping the results of drone searches carried out at the weekend could reveal clues about his disappearance.

SA Police Acting Commissioner Linda Williams has revealed the searches had been conducted on Friday and Saturday nights, and that the technology was the same used to look for the remains of alleged murder victim Julian Story at Port Lincoln.

Gus was last seen playing in sand at his family's vast and isolated homestead near Yunta about 5pm on Saturday, September 27. He is yet to be found.

Acting Commissioner Williams said the discovery of a boot print had prompted a "significant search" of a dam on Monday, but that the "print was subsequently found not to be related to Gus".

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