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BELO HORIZONTE Brazil Vale SA worlds largest iron ore miner knew last year that dam in Brazil that collapsed in January and killed at least 165 people had heightened risk of rupturing according to internal document seen by Reuters on Monday BELO 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 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