The previously unreported document is the first evidence that Vale itself was concerned about the safety of the dam. "There is no known report, audit or study with any mention of an imminent risk of collapse at Dam 1 in the Córrego do Feijão mine in Brumadinho," Vale said in an emailed statement. The company has lost a quarter of its market capitalisation — or nearly $19 billion — since the Jan 25 dam collapse, Brazil's most deadly mining accident. The October internal report identified static liquefaction and internal erosion as the most likely causes of a potential failure at the dam in Brumadinho. It was the cause of the 2015 dam collapse nearby, which resulted in Brazil's worst-ever environmental disaster.

Source: bd News24 February 12, 2019 02:03 UTC