The disappearance of Gus Lamont is one of those events that have a seismic impact on public consciousness: they distress, disturb, upset and unsettle. This week six mine shafts were searched, providing no further clues in the case.
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Gus has been gone for 63 days, and searches of mines, dams and scrub have yielded no clues
The words "mine shaft" make a chilling companion to the term "missing person" — to know that shafts are being searched for the missing is to confront an almost unbearably grim reality.
In the outback this week, the sombre task of inspecting historical diggings for any sign of a vanished boy fell to South Australian police.
For the past 63 days, they have been trying to shed light on the whereabouts of four-year-old Gus Lamont in a part of the world that can be austere and forbidding.
Gus's disappearance on September 27 from his family's homestead south of Yunta in remote South Australia has caused shock and sorrow across the state, as well as the nation.
It has also prompted harrowing comparisons — including with the most notorious of all of Australia's missing children, the Beaumonts, who were last seen in the Adelaide beachside suburb of Glenelg almost 60 years ago.
"We've had those other cases in the past, like the Beaumonts, that remain unsolved, and I think the memories of that live with South Australians," SA Police Minister Blair Boyer said on Wednesday.
While police have reiterated that they have not uncovered any evidence of foul play, early in the search detectives committed to leaving "no stone unturned".
It is a promise that has now, in a sense, achieved a degree of literal fulfilment.
It would not be an overstatement to say that with each new phase comes new hardship.
"It's a terrible situation, but I'm confident that SAPOL are doing everything they can to try to find him, and to follow up new leads, if and when they come to light," Mr Boyer said.
"This is a nightmare situation for the family here — but also all South Australians, I think, are riding that with Gus's family."