News ID: 238318
Published: 0312 GMT February 02, 2019

Official: Deadly Brazil dam burst likely had same cause as previous one

Official: Deadly Brazil dam burst likely had same cause as previous one
Rescue workers attend a mass for victims of a collapsed tailings dam in Brumadinho, Brazil, on February 1, 2019.

The collapse of a Brazilian dam controlled by miner Vale a week ago likely happened because parts of the sand and dried-mud structure dissolved into liquid, a state regulator said in an interview, similar to what caused another deadly mining disaster less than four years ago.

With 115 people confirmed dead and another 248 missing, according to information from the rescue team on Friday evening, the tailings dam collapse in the town of Brumadinho could be Brazil’s deadliest mine disaster, Reuters reported.

The burst tailings dam at the Corrego do Feijao mine last Friday has ignited intense public anger against Vale, which was co-owner of Samarco, the previous dam that collapsed.

Around 2,000 people gathered in Belo Horizonte, capital of the mining-intensive state of Minas Gerais which was home to both disasters, to protest against Vale, with some saying its top executives should be jailed.

There were also demands for a congressional investigation.

An internal study showed the miner knew as recently as last 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. Vale described the document as a routine disaster preparation plan required by regulators.

Hildebrando Neto, Minas Gerais’ deputy minister for environmental regulations, told Reuters late on Thursday that all evidence suggests that the burst was caused by liquefaction, whereby a solid material such as sand loses strength and stiffness and behaves more like a liquid.

Dams holding mining waste, known as tailings, sometimes collapse for this reason.

Major Brazilian TV outlets obtained dramatic security camera video showing the outer wall of the dam collapsing and an avalanche of mud crushing trees, houses and cars in its path. Closeups replayed throughout the day showed cars and people scrambling unsuccessfully to escape the dark red torrent.

The study envisaged that sirens would alert workers if the dam burst. The company has said the mud flow destroyed the sirens before they could sound the alarm.

Vale said in a statement that the plan was “built on the basis of technical studies of hypothetical scenarios in the event of a breach” although it did not directly reference Folha’s story.

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.

“If we had known (what the problem was), maybe this tragedy would have never happened,” the ministry’s mining secretary, Alexandre Vidigal, said. “We are in the investigation phase and we cannot say whether the (inspection) model was adequate or not.”



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