The collapse two weeks ago unleashed an avalanche of mud that engulfed nearby buildings and farms, killing an estimated 300 people in Brazil’s deadliest mining disaster. As evidence mounted that Vale missed warnings of trouble at the dam in the town of Brumadinho, pressure has risen on the firm and other mining companies to bolster safety measures to avoid a recurrence. ArcelorMittal shares dropped nearly 5 percent at 19.26 euros.
