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company has lost quarter of its market capitalization or nearly billion since Jan The company has lost a quarter of its market capitalization or nearly billion since the Jan 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