(The Guardian) - A group of investors controlling more than $10tn in assets has written to the world’s largest mining companies demanding they reveal the safety records of their waste dumps after the collapse of the Brumadinho dam in Brazil in January, which killed hundreds of people. The dam, owned by the Brazilian mining firm Vale, was used to store tailings, the unwanted byproducts of an iron ore mine. It failed, releasing 11.7m cubic metres of mud that swamped nearby buildings. It is believed the collapse killed about 300 people. FTSE 100 mining companies Anglo American, Antofagasta, BHP Group, Glencore and Rio Tinto have all received the letters, which give them 45 days to publicly disclose their dams’ size, construction methods and safety records.
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