Expert Panel Technical Report

Report of the Expert Panel on the Technical Causes of the Failure of Feijão Dam I

This website was created to share the Report presenting the results 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”) carried out by a panel of four experts in geotechnical engineering with special expertise in water and tailings dams: Peter K. Robertson, Ph. D. (Chair); Lucas de Melo, Ph.D.; David Williams, Ph.D.; and G. Ward Wilson, Ph.D. (the “Panel”). The Investigation was commissioned by Vale S.A. (“Vale”), and the panelists and consultants to the Panel were retained by outside legal counsel to Vale.

The Report reflects the Panel's professional expertise and judgment in reviewing and assessing requested relevant data and technical information to determine the technical cause(s) of the Dam I failure. The Panel did not assess matters relating to potential corporate or personal responsibility for the failure. The Panel was assisted in its work by various consultants, but the conclusions presented in the Report reflect the professional judgment of, and are solely attributable to, the Panel.

The official versions of the Report, its Appendices and the video presentation are in the English language. Should any contradiction or inconsistency of interpretation arise between the translated and the English language versions of the Report, its Appendices or the video presentation, the English language version shall prevail.

Any questions should be directed to