Inspection of Vale Dam in Brazil Issued Warning Before Collapse

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Inspectors of a Brazilian mining-waste dam whose collapse last month killed at least 150 people had warned its owner that faulty water drainage and monitoring systems represented a potential risk of failure, according to a safety report reviewed by The Wall Street Journal.

The report, provided to the mine’s owner Vale SA months before the disaster, found that flaws in monitoring crucial water concentrations and drainage made it difficult for the company to fully assess the dam’s stability.

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