Dam Performance

External Review


Vale requires periodic reviews of the dams' physical and hydraulic safety conditions, carried out by external and independent companies. These reviews comply with Brazilian legal requirements and commitments established with Brazilian authorities, such as the Public Prosecutors’ Office and the National Mining Agency (ANM). The main reviews are:

 
   
Regular Safety Inspection Report - RISR, with issuance of a Declaration of Stability Condition - DCE, in compliance with the legal requirements;
   
Independent audit, as per commitments entered into with the Public Prosecutors’ Office.




Independent Audit

 

Conducted by international companies, these audits meet the demands of the Public Prosecutors, with periodic reporting. More specifically, these companies audit the dam safety reports, reinforcement works, and emergency actions plans, among other important documents and works related to the dam, providing recommendations to Vale and monthly reports to the public authorities. After the completion of the evaluation of the main documents and the confirmation of the dam’s stability over a year, the audit service on the dam is deemed completed. Learn the flowsheet of independent audits:

 

Independent Audit


Additionally to this scope, the Public Prosecutors demanded Vale hires or includes on the independents audits’ original scope, a technical support to the Public Authorities on the analysis and monitor of the upstream dams’ removal (decharacterization) projects and schedules, and environmental impacts diagnosis and mitigation measures.

 

Engineer of Record



In January 2020, Vale established the role of Engineer of Record (EoR) to strengthen the governance of its Tailings & Dams Management System, as an additional inspection layer. The presence of this professional is a good practice recommended by the Mining Association of Canada (MAC), the Canadian Dam Association (CDA), by the Global Industry Standard on Tailings Management (GISTM) of the International Council on Mining and Metals (ICMM) and the Independent Dam Safety Advisory Committee (CIAE-SB), established by the company itself in 2019, which is now the Independent Tailings Review Board (ITRB) in compliance with the Global Standard.

The EoR conducts regular safety inspections twice a year, in March and September, and includes the assessment of the structures’ stability condition, with the issuance of the Stability Condition Declaration (DCE). In addition, the EoR issues monthly technical reports, continuously interpreting the results of inspection and monitoring activities on structures, among other duties. The EoR is external to operations and is integrated with Vale's lines of defense and at the senior management level, in order to act with the authority required for this type of function. In this model of continuous and rigorous monitoring, if a change in the safety condition of any structure is identified, a new Declaration of Stability Condition (DCE) may be issued at any time, throughout the year.
 

Dam performance


Below is provided a list of summarized EoR assessments of Vale’s dams, dikes, and drained piles, covered by the National Dam Safety Policy, that is, those that present at least one of the following characteristics:
 
  
Height of the massif higher than or equal to 15 meters, counted from the lowest point of the foundation to the crest;
  
Total reservoir capacity greater than or equal to 3,000,000 m³;
  
Reservoir containing hazardous waste in accordance with applicable technical standards;
  
Medium or high associated potential damage, as per criteria set by the ANM’s legislation 95/2022;
  
High risk category, as per criteria set by the ANM’s legislation 95/2022.

Note: The data is updated every 30 days.
Legends
Learn more about the legends
Satisfactory With Possible Operational Improvements
Satisfactory With Restriction
Unsatisfactory With Possible Safety Issues
Unsatisfactory With Possible Safety Issues

* Updated on 01/02/2023

Technical Reports


In compliance with article 14 of Law 23,291/19, which instituted the dam safety policy in the state of Minas Gerais, Vale provides the following information and technical reports with respect to its dams:

 
  
Third party companies that perform construction, installation, operation, renovation, expansion and heightening of dams (in Portuguese, only)
Information on third party companies
  
Water Quality (in Portuguese, only)
Water Quality Reports
  
Air Quality (in Portuguese, only)
Air Quality Report