London — A Swiss environmental expert will make a fact-finding trip this week to the site of the Vale dam disaster in Brazil to start work on setting new dam safety standards for miners.

The safety of dams used to store mining waste, known as tailings, gained prominence after the collapse of Vale’s dam at Brumadinho, Brazil, in January. It killed about 250 people and was the second Vale tailings dam collapse in Brazil in less than four years...

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