Excavation at a factory site in Adelaide has been called off after failing failed to find the remains of the missing Beaumont children, ensuring the 50-year mystery of their disappearance will continue.
The dig on Friday uncovered some animal bones but nothing related to the Beaumont children, Chief Superintendent Des Bray said.
"I can confirm that we have searched the areas of interest and reached the bottom of those areas and gone well below so that we can be 100 per cent certain," Supt Bray said.
"I can confirm we have found bones of various animals, but there has been nothing human located on the site.
"Sadly this means for the Beaumont family that we still have no answers.
"But we will always do anything humanly possible to locate the Beaumont children and take them home to their family."
The dig was sparked by recent scientific studies which revealed signs of a large hole dug on the Plympton North site at around the time the children went missing.
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Jane, 9, Arnna, 7, and Grant, 4, never returned after leaving their parents' Glenelg home for an afternoon at the beach on Australia Day 1966.
Their disappearance sparked an intensive search but they were never found, making it Australia's most enduring cold case.
In 2013, new information focused the investigation on a factory west of Adelaide, after two brothers told police they spent the 1966 Australia Day weekend digging a large hole there at the request of owner Harry Phipps who died in 2004.
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