Fundação Renova

24 – IMPLEMENTATION OF TAILINGS RETENTION AND TREATMENT SYSTEMS IN IMPACTED RIVERS

Objective of the program

To construct and operate, in a safe way, sediment containment structures for the storage of the materials removed from the river channels and their surroundings, when applicable, aiming mainly at the gradual reduction of turbidity of the rivers to maximum levels of 100 NTU in the dry season, within a maximum period of three years.

Progress of Program

PENDING
• There were no relevant deliveries this month.

There were no relevant deliveries this month.

There were no relevant deliveries this month.

There were no relevant deliveries this month.

There were no relevant deliveries this month.

There were no relevant deliveries this month.

There were no relevant deliveries this month.

There were no relevant deliveries this month.

There were no relevant deliveries this month.

There were no relevant deliveries this month.

There were no relevant deliveries this month.

There were no relevant deliveries this month.

• Completion of the application of geotextile fabric, TU transition and execution of riprap to stabilize the downstream slope of the right shoulder.
• Release of resumption of landfill with request for removal of 1.0-meter layer by BVP Engenharia.
• In tests conducted by Chammas and evaluated by BVP Engenharia and, together with Samarco, Chammas and the Renova Foundation, it was concluded that there were no hidden defect errors, according to the results presented.
• Finished removal of 1.0-meter laterite from the core of El.796.50 to El. 795.50.
• Spillway excavation - in progress, modules 12 to 15.
• Correction in 03 piezometers in the right shoulder.
• In progress cleaning of the right and left shoulders and the draining filter on the right shoulder.
• In progress execution of riprap of E1 upstream and downstream of the massif axis.
• Completion of the hand over and start of operation by Samarco from August/01/2019. Delivery of the massif at elevation 801.3m by the Renova Foundation.

• Release of aggregates in the groove.
• Supply of laterite by Vale and laterite treatment in Fabrica Nova.
• Excavation of the reservoir of the main cofferdam.
• Removal of soft soil from the cofferdam.
• Assembly of the advanced construction site at Plant 3, area P4.
• Execution of drains downstream of the right shoulder.
• Demolition and cleaning of the temporary canal.
• Installation of geotextile fabric, transition of TU and application of riprap.
• Application of riprap at E1 upstream of the massif axis and downstream of the massif axis - at the E1 release area.
• Release of material for slope stabilization, downstream of the right shoulder.
• Cleaning the earthfill, riprap and main area.
• Execution of laboratory tests (proctor) and extraction of undeformed blocks.
• Removal of the sacrificial layer from the massif.
• Installation of 6” galvanized pipe for instrumentation for stabilization of downstream slope of OD.
• Initiation of cleaning of the internal drainage on the right shoulder.
• Completion of laboratory tests by Chammas.

• Resumption of removal of the soft soil at the cofferdam.
• Initiation of digging of a groove on the right downstream shoulder.
• Improvement to the access of the Laterita courtyard.
• Closed with E1 material and concreting of the cofferdam was completed.
• Launch and welding of PAD piping of the pumps.
• DRAG FLOW is in operation.
• The installation of the advanced construction site in Fugro and in Plant 3, area P4, is underway.

• Resumption of removal of soft soil from the main coffer to the ADME (area of disposal of surplus materials), restricted by 160 trips per day.
• Put on hold the assembly of the construction sites in the area of Fugro (legal request FR).
• The delivery of the aggregates is underway (Irmaos Machado).

Removal of the soft soil at the Vale coffer has been completed.
Completion of the assembly of the Pumping System of the Vale coffer.
Continuity of removal of soft soil at the main coffer.
In progress, the assembly of the construction sites in the Fugro area.

Initiation of works to improve access roads.
Application of the concrete projected on the embankment side of the spillway has been completed.
Removal of construction site from the Germano dam self-rescue zone.

Only the activities of the Rainfall Action Plan for the 2018/2019 Rainy Season are still in place.

Only the activities of the rainfall action plan for the 2018/2019 Rainy Season are still in place.

Only the activities of the 2018/2019 rainy season plan were maintained.

Preparation and implementation of works of the rainfall plan for the 2018/19 rainy season.

Work on the Axis 1 dam continued, even as the preparatory construction activities for the 2018/2019 Rainy Season.

Work continued on the Axis 1 dam and preparatory activities were initiated for the works for the 2018/2019 Rainy Season.

Underway are the execution of the Axis 1 dam and transport of aggregates for these works.

This month, the following activities were carried out:

● Downstream cleaning on the right shoulder of the dam was completed;
● Construction of the spillway and demolition of the cofferdam channel - activity still in progress.
● Initiation of concrete injection, an important measure for the safety of the Axis-1 foundation. The work is being developed by the construction company Salum;
● The logistics of aggregates are underway;
● Delivery of five piles of laterite.

The contractor Sallum continued their concrete injection and tailings cleaning works during this period. The truckers' strike hampered the aggregate supply.

Construction of the Experimental Landfill was initiated.

The executive projects of the spillway of the Axis 1 Dam, at elevation 820, were revised according to AECOM recommendations.

The State Department of Environment and Sustainable Development authorized the cement injection service in the dam area of Axis 1. This injection will treat the fissures of the terrain, leaving it more stable for the construction of the dam. The company responsible for performing the services began its work.

The cement injection in the Axis 1 dam area was authorized by the State Department of Environment and Sustainable Development (SEMAD) and the company responsible for deploying the services has begun its work. This injection will treat the fissures of the terrain, leaving it more stable for the construction of the dam.

The complementary project for the injection of cement mix by the engineering company BVP is in development. The end date of the current scope is scheduled for next month.

Geocontrol has begun surveying the yards of the households with probes to study the stability, as recommended by the company AECOM. After the surveys the company contracted, Walm, will issue the report of the stability study, scheduled for May.

The company responsible for the renovation of Samarco's cafeteria was hired. The cafeteria will be used by the employees of the Axis 1 dam project, Novo Bento Rodrigues and Paracatu de Baixo, in Minas Gerais.

The elevation of the containment structure of Axis 1 to a height of 843 meters will be decided with the definition of the PRAD (Degraded Area Recovery Plan) solution. A possible elevation to a height of 860 meters was eliminated.

Regarding the already defined scope of the elevation to a height of 820 meters, the executive projects that are being drafted by BVP are being migrated from Samarco to the Renova Foundation, with completion scheduled for February 2018. The contract’s deadline and costs will be adjusted after the migration, with the delivery date of the executive projects set to March 2018.

For the execution of this service, the supply and transportation of the aggregate material began on January 23, 2018. The technical proposals for the execution of the dam were handed over to the Renova Foundation. They have already been technically analyzed and returned to the supply sector. The contracting of the company for this service is scheduled for March 2018.

Due to the postponement of the emission of the TAC for the execution of the dam works, which went from January to February, a Simplified Environmental Assessment was filed requesting the execution of the cement injection service.

The companies listed for the execution of the Axis 1 dam presented their respective proposals. The company that will execute the services will be selected in February 2018.

In parallel, truck scales, which will control the supply of construction materials for the Axis 1 dam, were assembled, installed, calibrated by the National Institute of Metrology, Quality and Technology (Inmetro) and tested with loads.

The scope of the program was defined, considering the construction of the Axis 1 containment structure up to the 820m quota. The definition of height to quota 843m will be made by the State Department of Environment and Sustainable Development (Semad), based on the study of the Recovery of Degraded Areas Program (PRAD) presented by Samarco.

The mandatory cleaning services of the site where the dam of Axis 1 will be built, near the former location of the Fundao dam, have been completed. This stage is very important, since it allows the initiation of the construction of the new dam, scheduled for May 2018.
The mobilization of the supply and transport services of the necessary aggregates for the construction of the new structure was also started, and a workshop and technical visit were undertaken with the interested parties to present the construction works.
In November, the installation of weighbridges at the gates of the Santarem and Germano dams was also initiated.

The installation of the instrumentation equipment of the Nova Santarem dam, in Mariana (MG), was completed and its operation started.

Mandatory cleaning services continue on the site where the Axis 1 dam will be built, close to the Fundao dam area. This stage is very important for the initiation of construction of the new dam, scheduled for March 2018.

The contracting process was concluded for the supply and transportation of material for execution of the Axis 1 dam. Also started was the hiring process for the construction of this installation.

The installation of instrumentation equipment for the Nova Santarem dam is advancing, with an expected completion by October 2017. After this, the dam will start its operation.

Mandatory cleaning services continue on the site where the dam of Axis 1 will be built, close to the Fundao dam area. This stage is very important for the initiation of construction of the new dam, scheduled for March 2018. The project is in its detailed engineering phase.

The main litter was cleaned, where a volume of approximately 69,000 m³ of tailings was removed. In parallel, the construction activities of the superficial drainage channels in the left frame was started.

Progress was made in the installation of the instrumentation equipment of the Nova Santarem dam, in Mariana (MG). Completion is expected by October 2017. After this, the dam will start its operation.

Mandatory cleaning services continue on the site where the new dam will be built, next to the Fundão dam area in Mariana, scheduled for March 2018. The project is in its detailed engineering phase.

Completion of the works on the new Santarem dam, in Mariana (MG). The installation services of the instrumentation equipment are in progress.

Continuity of the cleaning services of the site where the Axis 1 Dam will be built, which will replace the Fundão dam. The project is in engineering detailing phase.


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