Four people from the German consulting group Tüv Süd, company that certified the safety of Vale’s dams, were also detained.
Corrego do Feijao Mining News
About 700 people were evacuated from two towns located near tailings dams operated by Vale and ArcelorMittal on mounting fears after last month's breach at Brumadinho, the country's deadliest mine disaster.
Brucutu, which has an annual capacity of 30 million tonnes of iron ore, is Brazil's second largest mine, behind Vale’s Carajás.
The argument is being harshly criticized by experts and locals, who believe the law-enforced audible could have saved lives.
Funds expected to be used as compensation for the victims of last week’s tailing burst, which killed at least 99 people.
Brazilian authorities and companies involved with river water management are trying to stop the torrent of mining waste from reaching the Sao Francisco river, a source of drinking water for communities in five of the country's 26 states.
48 people have been identified so far, as work continues in the area.
Chief Executive Fabio Schvartsman said Vale would halt operations using those dams and spend 5 billion reais ($1.3 billion) to decommission them.
Bolsonaro and his cabinet are swiftly dialing back promises of deregulation.
The International Coalition of Large Dams (ICOLD) group "is recommending that dams, especially large dams, be built by dam professionals.
Two other engineers, who worked for Germany’s TUEV SUED on a contract where they attested to the safety of the Vale dam, were arrested in Sao Paulo.
“Before pointing out fingers we need to see what happened first”
"The fact is that Vale's share drop was even steeper than some market participants expected"
“How can they let this happen again?” Melo said. “They wiped out our city.”
Vale plunged as much as 20 percent in Sao Paulo on Monday, the biggest intraday drop since October 2008.
An alarm warning of an imminent mining dam rupture was issued on Sunday morning near Brumadinho, the same Brazilian community where the collapse of Vale's dam on Friday killed at least 58 and left over 400 more feared dead.
As early as next week, iron ore prices may start to reflect the impacts of Vale's dam bursting at Corrego de Feijao in Brumadinho.
Nine bodies had been recovered by Saturday morning.