London — A global inquiry into how mining companies store billions of tonnes of waste in huge dams, launched after a collapse in Brazil killed hundreds, shows about a tenth of the structures have had stability issues, investors said on Thursday.

The research was led by the Church of England (CoE) and fund managers after the collapse of a Vale dam in January unleashed an avalanche of mining waste on the Brazilian town of Brumadinho, killing an estimated 300 people...

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