At approximately 12:28 p.m. local time on January 25, 2019, tailings dam B-I at Vale S.A.'s Córrego do Feijão Iron Ore Mine ("Dam I"), located 9 kilometers (km) north-east of Brumadinho, in the state of Minas Gerais, Brazil, suffered a sudden failure, resulting in a catastrophic mudflow that traveled rapidly downstream. This report presents results and interpretation of the assessment of the technical cause(s) of the failure of the Dam I at the Córrego do Feijão Iron Ore Mine (the "Investigation")