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Vale has said it will invest some million from 2020 to reduce its reliance on tailings dams which store muddy detritus from mining Vale has said it will invest some million from 2020 to reduce its reliance on tailings dams which store muddy detritus from mining NeutralBELO HORIZONTE Brazil Vale SA the worlds largest iron ore miner knew last year that the dam in Brazil that collapsed in January and killed at least 165 people had a heightened risk of rupturing according to an internal document seen by Reuters on Monday http://www.reuters.com/places/mexico/article/us-vale-sa-disaster-exclusive/exclusive-brazil-miner-vale-knew-deadly-dam-had-heightened-risk-of-collapse-idUSKCN1Q02872019-02-12