During our field visits we identified some divergence in the interpretation of the data requested, which resulted in varying quality and basis of data reporting; In the course of our Assurance the inconsistencies found in the Report regarding one or more principles of the GRI-Gand the sector supplement were satisfactorily corrected, except for the data and information related to formal aspects of dam structures used in mining areas, which, in our opinion, should be presented in a more clear and objective manner; Vale published data or justified the absence of data regarding the indicators associated to material aspects of the GRI-G4 and the sector supplement.