Police have emptied a large dam on a remote South Australian property where Gus Lamont disappeared more than a month ago,
The four-year-old was last seen playing outside Oak Park Station, roughly 40 kilometres south of Yunta, on September 27.
Emergency crews returned to the property this morning to drain the main dam into the southern dam, clearing out weed beds to enable a thorough visual inspection.
This operation comes after extensive ground and aerial searches around the homestead where the boy went missing.