At least 115 people are dead and there is little hope of recovering most of the missing.
The emergency service for the state of Minas Gerais, where the disaster occurred near the town of Brumadinho, added that the search for bodies was ongoing.
Helicopters hover over an iron ore mining complex to release thousands of flower petals paying homage to the 110 victims killed and 238 who are still missing after a mining dam collapsed there a week ago, in Brumadinho, Brazil, Feb. 1, 2019. The company has promised to decommission another 10 tailings dams it owns in Brazil.
A video aired on local media, has captured the moment a dam at an iron ore mine in south Brazil burst, releasing a wall of toxic sludge and mud.
.An internal study showed the miner knew as recently as previous year that some of the areas swamped with toxic mud were at risk if the dam burst, according to a report by Folha de S.Paulo newspaper.
A Reuters story Friday quoted a state regulator as saying the cause of the Brumadinho collapse is likely the same as in 2015: sand and mud holding up the structure dissolved into liquid, creating a toxic and deadly wave of debris.
The most recent victims were found in a changing room that was buried by more than 20 metres of mud.
Aerial view over mud and waste from the disaster caused by the dam spill in Brumadinho.
The study envisaged that sirens would alert workers if the dam burst.
Officials with the Mines and Energy Ministry and the National Mining Agency (ANM) told reporters on Friday that the cause of the rupture was still unclear and that all documentation regularly submitted by Vale had indicated that the dam was stable.
"Everybody, the majority, worked in mining", he said.