The Mariana dam disaster occurred on November 5, 2015, when the Fundão dam, owned by Samarco (a joint venture between Vale and BHP Billiton), collapsed in Minas Gerais, Brazil, releasing 50 million cubic meters of mining waste. The toxic mudflow devastated communities, polluted the Rio Doce, caused 19 deaths, displaced thousands, and triggered one of the worst environmental disasters in Brazilian history.
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A Brief History of The Mariana dam disaster

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The Mariana dam disaster occurred on November 5, 2015, when the Fundão dam, owned by Samarco (a joint venture between Vale and BHP Billiton), collapsed in Minas Gerais, Brazil, releasing 50 million cubic meters of mining waste. The toxic mudflow devastated communities, polluted the Rio Doce, caused 19 deaths, displaced thousands, and triggered one of the worst environmental disasters in Brazilian history.