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The disaster in the mineralrich state of Minas Gerais was the second major collapse of a mining dam in the region in about three years NegativeBELO 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