Exclusive: Brazil's Vale knew deadly dam had heightened risk of collapse
![](https://r58b8e.a2cdn1.secureserver.net/wp-content/uploads/2018/02/worldnewsdyil2auoc8za.gif?time=1719360632)
Vale SA, the world’s largest iron ore miner, knew last year that the dam in Brazil that collapsed in January and killed at least 165 people had a heightened risk of rupturing, according to an internal document seen by Reuters on Monday.