LONDON (Reuters) – 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 (VALE3.SA) dam in January unleashed an avalanche of mining waste on the Brazilian town of Brumadinho, killing an estimated 300 people.
A waste, or tailings dam, is the most common waste disposal method for mining companies, whether they’re extracting iron ore, gold or copper. They are among the largest man-made structures on earth, with some towering dozens of meters high and stretching for several kilometers.