RIO DE JANEIRO (Reuters) – Brazilian iron ore miner Vale SA told prosecutors in the state of Minas Gerais that a dam is at risk of rupturing at its Gongo Soco mine, about 40 miles from where its Brumadinho dam collapsed, killing more than 230 people.
According to a document published on Thursday, prosecutors said Vale is predicting the dam in the city of Barao de Cocais may collapse next week if the current rate of movement in the embankment of the mine pit close to the dam is maintained.
The warning underlines ongoing concern about the stability of dams in Brazil’s mining heartland of Minas Gerais in the aftermath of the Brumadinho accident, which itself came less than four years after another deadly dam collapse at a joint venture between Vale and BHP Group.
Vale said in a late afternoon statement it remained unclear whether the slippage in the embankment would actually trigger a collapse of the nearby Sul Superior dam, but said it was raising its level of alert and readiness for such an extreme case.
Earlier this week, Vale had identified movement close to the mine, which has not been active since 2016, the prosecutors said. About 500 people seen at risk from a collapse of the dam have been evacuated from their homes since February under orders from mining regulator ANM.