Webinar Taillings - VF
Webinar Taillings - VF
Webinar Taillings - VF
Webinar ESG
Tailings Dam Management
2
Agend
1. Opening remarks
2. Safety and operational excellence
3. Introduction to tailings dam
4. Tailings management
5. Final remarks
3
Opening remarks
4
A year ago, we added two new pillars to our strategy
5
We are honouring our new pact with society...
…with efforts to mitigate the impacts …and advancing with the reparation of
of COVID-19 Brumadinho
R$ 3.8 billion
in indemnifications¹
7
We adopt the three lines of defense model to assure our safety
and operational excellence
External audit
• Provide technical
Regulatory
update the risk profile • Consolidate the registry of Audit Committee and the
operational risks guidance and support to
Board of Directors
• Define standard operating manage critical risks
• Complement the minimum regarding the general
procedures
risk standards • Support discussions about adequacy of controls
the company's risk profile
• Set execution standards
Executive Board
8
Vale has strengthened its governance to safety and operational
processes, as well as to its geotechnical structures
Operational • Support to the Board of Directors and interact with Dam Safety Committee
Excellence and Risk • Assess corporate risk management
Committee • Monitors operational risks, especially geotechnical ones
Extraordinary Ind. • Support to the Board of Directors, through the Operational Excellence and Risk Committee
Consulting Committee • In 2019, it held 19 meetings, spent 40 days in field trips and released 16 reports to the BoD
for Dam Safety • Committee will be maintained until April, 2021.
9
The second line of defense is managed independently from
operations
10
Introduction to
tailings dam
11
Tailings dam are used to store liquid, solid, or a slurry of fine
particles
Downstream Upstream Centerline
The downstream shell is built on The dam body is constructed The centerline method is a
compacted soil, regardless of using the deposited tailings. It is hybrid of upstream and
the type of tailings used. It is built in the opposite direction of downstream designs. In
built in the direction of the water the water flow (upstream). The Centerline construction, the
flow (downstream). dam needs thick tailings so that dam is raised vertically from the
the shell can be constructed. starter dam.
• Foundation failure: Soil or rock below the dam is too weak to support
the dam
• Liquefaction: The solid material begins to act and move like a liquid.
Can be static or dynamic Internal erosion illustration
Monitoring, inspections and reviews from internal and external experts Dynamic liquefaction illustration
13
Vale’s tailings dam portfolio is concentrated in Brazil
Location and operational status of operated tailings storage facilities¹ (TSF)
Active
Canada Inactive²
7 8
Under construction
TSF upstream method
Canada
4
64 operated tailings facilities
Pará • 27 active
1 • 35 inactive
5 Mozambique
New Caledonia
• 2 under construction
2 1
Brazil 23 2 1
Mato Grosso 4
8
do Sul Minas Gerais
14
1 Includes facilities within Vale operations and excludes Non-operated Joint Ventures (JVs). Vale’s non-operated JVs has 21 active and 5 inactive structures, of which 2 structures are upstream. The number of tailings storage facilities is calculated based
on the definition agreed by the International Council on Mining and Metals Tailings Advisory Group in response to the Church of England information request, which may differ from Brazilian National Mining Agency definition.
2 Inactive includes facilities not in operational use, under maintenance and in post-closure care and maintenance.
For further details on tailings dam in our portfolio please see our more detailed disclosure here.
14
Vale is evolving with the de-characterization of upstream tailings dams
and other structures in Brazil
Note: The schedule may change until the phases are completed and according to public agencies. 15
Vale has completed the containment structure for Sul Superior
Despite
Vale hasthe COVID scenario,
completed thedam
the backup works
foron
Sulcontainment
Superior structures
continued as considered essential to safety
18
We are implementing a new Tailings Management System
Cultural transformation
19
To design Vale’s tailings management system, gaps were
assessed for each key element
Project Phase Standard Operating Procedures International
Dam Classification
Standards
Water Management Guideline
Planning
Dewatering Technology Selection
Closure Planning
Geotechnical Investigation
Project life cycle
Geotechnical Analysis
Design Hydraulic Structures
Dam Break Analysis
Risk Management
Construction / Quality Assurance and Quality Control Program
Implementation As-Built Report
Operation, Maintenance and Surveillance Manual
Emergency Preparedness and Response Plan
Operation
Change Management
Monitoring & Design Verification
Care and Maintenance / Dam Safety Inspection
Closure / Post-Closure Dam Safety Review
Delegated Business-level
Responsible Person Ownership
of AEO at a corridor Engineer of Records
(Dam Owner)
level (i.e. Operational
Corridor Director/ Geotech Assurance
1st line of defense
COO) (Checks & Balances) 2nd layer
Delegated Responsible
Risk-level Ownership Person of DO at an
Operations
(Risk Owner) asset/ complex level
(technical expertise to
understand risks)
Control-level Ownership
(Risk Control Owner) Delegated Responsible
Person of Risk Owner
Note: Aligned with MAC (Mining Association of Canada) best practices.
Our Tailings Management System is based on three levels:
Routine, Performance and Risk (RPR system)
17 EoR’s hired for Iron Ore All dam portfolio covered until end of
Dashboards with key performance
2022
indicators being prepared and used in
EoR’s responsible by Dam Safety Three global consulting companies
the operational meetings
Inspections supporting Vale
24
Basic Geotechnical Guidelines
25
Engineer of Record and the continuous performance
assessment
Unsatisfactory
• Good practice recommended by MAC (Mining Association of
Canada), CDA (Canadian Dam Association) and the
Extraordinary Independent Investigation Committee
• Work plan
• Internal
communication Testing
• Inventory
• Priorities Chosen sites:
• Hire consultants • Sudbury and
Long Harbor
Implementation
Lessons learned
Conclusion
27
Portal in geotechnics to share expertise and disseminate knowledge
Integration workshops
28
Geotechnical team is also part of Vale’s Cultural transformation
with transparency, responsibility and technique
Roles are clear People understand their roles and responsibilities
Accountabilities are There is clear accountability at both process and personal level
defined
Lines of defense in
Boundaries are set and all stakeholders understand their part
place
29
Case 1: Brucutu
30
Case 2: Itabiruçu
• The decision was taken with the recommendation from the second
line of defense, in line with auditors, even for a dam with stability
declared by the external auditor (positive DCE).
• The dam still remains with positive DCE but was decided by 2nd and 1st
line together the EoR to finish all the engineering studies to return with
the raising construction.
31
Final Remarks
32
Our new tailings management approach is based in a multi
layers of protection, improving our capacity to avoid accidents
Geotechnical Geotechnical Safety & Independent Chief Engineer Independent Dam Safety
operations support Operational Board Compliance of Auditors Reviews
team team Excellence Committee Officer Record
Office for Dam Internal audit and Dam safety Public Periodical
Safety whistleblower inspections and Prosecutors technical reviews
channel performance technical reviews by external
assessments and Tailing engineering
Review Boards company
33
Our objectives
1. Finalize the new Tailings Management System implementation across all business
by December 2020, aligned with best international practices
2. Complete the As-Is drawings, operational manual, and emergency plans of all
structures by December 2020 (85% concluded)
5. Increase dry processing operations, expected to reach 70% of the iron ore
production volumes by 2023
34 34
Vale’s ESG Portal: transparency
for our dam management
Click here to visit.