Vale Says Experts Blame Drainage Problems for Deadly Dam Collapse
2019年12月12日 - 11:19PM
Dow Jones News
By Samantha Pearson and Luciana Magalhaes
SÃO PAULO -- Vale SA said experts hired by the miner have
concluded that drainage problems were largely to blame for the
collapse of its dam in January that killed 270 people in
Brazil.
Experts said the original design of the dam prevented correct
drainage at its base, allowing water to build up over time,
according to their report released by Vale on Thursday. The dam was
built in the 1970s by another Brazilian company, Ferteco Mineração,
which Vale acquired in 2001. There were no significant attempts to
introduce other internal-drainage mechanisms in the dam as it was
gradually built up, experts said. Its stiff and brittle contents,
which contained a particularly high level of iron, also helped
destabilize the dam, they concluded.
While Vale stopped dumping mine waste in the dam in 2016,
monitoring equipment at the structure showed the water level didn't
decrease significantly, the experts said.
Unusually heavy rainfall during Brazil's wet season that came
around the time of the collapse also prompted the structure to lose
strength, the experts hired by Vale said.
Write to Samantha Pearson at samantha.pearson@wsj.com and
Luciana Magalhaes at Luciana.Magalhaes@wsj.com
(END) Dow Jones Newswires
December 12, 2019 09:04 ET (14:04 GMT)
Copyright (c) 2019 Dow Jones & Company, Inc.
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