Public Disclosure

The commitment of Mining Rio do Norte S/A (MRN) to the Waste Storage Structures (EAR) of its property is guided by safe, responsible and transparent management, aligned with the principles of the Global Standard of Industry for Waste Management (GISTM) through an integrated approach based on risk management throughout the life cycle of waste facilities, focusing on failure prevention, protection of people, communities, environment and assets.

 

This report aims to present in a transparent way the actions developed by MRN regarding waste management, safety monitoring and mitigation strategies for environmental and social impacts.

 

MRN ensures high management oversight, application of engineering best practices, continuous risk management, emergency preparation and transparent engagement with stakeholders, promoting continuous improvement and sustainable value generation.

MRN operates in the exploration and processing of bauxite in the Porto Trombetas complex, located in the municipality of Oriximiná, in the state of Pará. Bauxite is the raw material for the production of aluminum, a metal essential to humanity and used in various sectors such as transport, construction, packaging and energy.

 

The bauxite processing generates a tailing composed of water, sand and clay fractions, which is arranged in specific structures, called waste reservoirs. After disposal in the reservoirs, the materials are drained, excavated and made available for reuse in accordance with the closing plan. This process strengthens the circular economy strategy by promoting the recovery and reintegration of these materials into the productive cycle.

 

MRN concluded the implementation of the 77 GISTM requirements after a structured program that involved gaps assessments, development of action plans, document review and strengthening of waste management processes. The case was completed in August 2025. As part of this commitment, the MRN concluded, in August 2025, the implementation of the applicable requirements of the GISTM and provides for an independent assessment of adherence to the standard for 2026.

 

To support this journey, MRN has structured its Reject Management System (TMS – Tailings Management System), which integrates policies, processes, responsibilities, information systems, continuous training, independent audits and performance reports. The MST ensures that all stages of the EAR life cycle, from its planning to closure, are conducted based on technical, ethical and transparent criteria. The governance of the system is reinforced by a Corporate Policy for Reject Management of MRN, which guides decisions and conduct throughout the organization. This policy establishes clear principles for risk assessment and management, stakeholder engagement, open communication, regulatory compliance and continuous improvement. Thus, MRN strengthens its prevention culture, promotes operational excellence and ensures compliance with the highest standards of the mineral industry, reaffirming its commitment to the safety and sustainability of the regions where it operates.

The MRN waste disposal system consists of three main areas: Saracá Leste and Saracá Oeste, intended for the disposal of waste from the processing of bauxite, and the Port Dams, which consist of sediment containment structures in order to promote environmental control, minimizing the loading of sediments to the water bodies and also the regularization of flows.

 

In the Eastern Sahara, the waste disposal system consists of 23 structures, comprising 02 TPs (Thickening Ponds), 15 SPs (Settment Ponds) in operation, four structures in the process of decharacterization and an inactive structure.

 

The TP-01 remains active, with planned closure plan, while the TP-02 receives pulp waste from the Benefit Plant, promoting its primary density. Subsequently, the SPs in operation (SP-4 Norte, SP-5 Unified, SP-7A, SP-7B, SP-7C, SP-8, SP-9, SP-10, SP-11, SP-12, SP-13, SP-14, SP-15, SP-16 and SP-19) receive the waste from TP-02, where secondary densification occurs, sedimentation and drying of the material.

 

As a support structure for the operation, the system also has the TP-03, for the storage of surplus water from the Benefit Plant. This water is reused during the drought period, contributing to operational continuity and to the reduction of the capture of new water resources.

 

The system complements the structures SP-01, SP-2/3, SP-06 and SP-9A, currently in the process of uncharacterization, and the structure SP-4 South, classified as inactive.

 

In Saracá Oeste, the system consists of 07 reservoirs (SP-23, SP-24A, SP-24B, SP-24C, SP-25A, SP-25B and SP-25C), all in operation.

 

Thus the MRN has 32 reservoirs framed in the National Dam Safety Policy, distributed between Saracá Leste, Saracá Oeste and Dams do Porto. Figure 1 shows the location of the structures of the Saracá East and West.

 

 

All MRN structures have and are operated in accordance with the Operation, Maintenance and Monitoring Manual (Operations, Maintenance and Surveillance – WHO). In addition, they remain under continuous and uninterrupted monitoring, 24 hours a day, 7 days a week, through the Geotechnical Monitoring Center (CMG) that is part of the Integrated Operations Center (IOC) of MRN.

 

The MGC is an environment dedicated exclusively to the monitoring of dams, being responsible for monitoring geotechnical instruments and alert systems, as well as for the continuous evaluation of the operational conditions of structures and the activation of response protocols whenever necessary.

 

As a complementary control tool, MRN implemented Response Action Activation Plans (TARPs – Trigger Action Response Plan), which establish control levels, drive criteria and gradual response actions for each structure, based on data from geotechnical instrumentation and conditions observed in field inspections, allowing to support the definition of operational limits and specific corrective measures where necessary.

 

Moreover, the structures undergo regular field inspections, carried out by qualified technical staff. These inspections aim to identify, record and treat anomalies such as cracks, emergences, rebates, erosions, instrumental failure and other conditions that may affect the integrity and performance of the structures, in addition to evaluating the conditions of the access routes, conditions of emergency extravasators, surface drainage, vegetation cover and presence of fauna.

 

A Table 01 the following presents a summary of the main technical and operational characteristics of MRN structures, including information such as year of implementation, constructive method, operational situation, height, volume, area, geotechnical instrumentation, among others. These parameters help for basic composition for operational management, monitoring and evaluation of dam safety.

 

Table 01 – General characteristics of MRN structures

 

MRN continuously invests in the modernization and improvement of its waste disposal system, developing projects that cover all phases of the life cycle of the structures, including planning, design, implementation, operation, decharacterization and closure. These initiatives are based on technical criteria of engineering, risk management and continuous improvement, aiming to ensure the integrity of the structures, operational reliability and minimization of environmental impacts.

 

On the eastern Saracá plateau, there are works to resume waste in selected structures, in accordance with the planning of optimization of the disposal system. The excavation of the desiccated waste allows the recovery of the reservoirs' useful volume, expanding their operational capacity and contributing to the increase in the service life of the structures. The interventions also include the regularization of ridges, the implementation of new extravasation systems, adjustments in superficial drainage devices and the unification of structures, aiming at improving the hydraulic and geotechnical performance of the system.

 

In line with the Plano de Closamento do Platô Saracá, the desiccated waste from these interventions is reused as engineering material in works located downstream of the structures, contributing to the topographical conformation, geotechnical stability and the implementation of the closing measures foreseen for the area.

 

In addition to operational optimization actions, MRN continues the closing activities of structures SP-01, SP-2/3, SP-06 and SP-9A and TP-01. From those structures that are in decommissioning works, the services comprise in adjustments of hydrological and hydrogeological control systems, final ground conformation, revegetation and post-closure monitoring, ensuring the physical and environmental stability of the structures and their long-term safety.

 

All interventions are carried out based on specific engineering projects and accompanied by geotechnical monitoring, in order to ensure the maintenance of the stability conditions of the structures from the design phase to the closure.

 

The projects under development are part of the strategy of closing the Eastern Saracá, making adjustments of superficial drainage and topographical conformation as well as geometric adjustments in existing structures and canals and lakes.

The security management of the MRN dams is conducted through an integrated system that includes continuous monitoring, field inspections, geotechnical evaluations, risk management, maintenance, audits and technical reviews, ensuring compliance with applicable Brazilian legislation and best national and international engineering practices, including the principles established by GISTM.

 

Within the scope of Brazilian regulation, structures are classified as Risk Category (CRI) and Associated Potential Damage (DPA), parameters that can be framed in levels: low, medium and high, according to the classification established by the National Mining Agency (ANM). Currently, of the total of 32 structures, only TP-01 and TP-02 are classified as APD Tall, while the other structures fit as Middle DPA. Regarding the CRI, the MRN has 05 medium CRI structures, namely: TP-01, TP-02, SP-4N, SP-7A, SP-7C, the other structures, i.e., 27 are classified as low CRI.

 

In addition to the classification of MNA, GISTM establishes a Consequence Classification, whose objective is to evaluate the magnitude of potential consequences resulting from a hypothetical scenario of failure of a storage structure or waste. This assessment considers aspects such as the potential for loss of lives, environmental, social, cultural, infrastructure and economic impacts, being used to direct governance requirements predicted by the global standard. Thus, the Consequence Classification has a specific purpose and complements the Brazilian classification.

 

Based on the criteria established by GISTM, MRN waste storage structures fall within the High category, as shown in the Figure 2. This classification is based on the results of the hypothetical rupture study of its structures and is validated by the Register Engineer (EoR) as well as by the Senior Independent Technical Reviewer (SITR).

 

Periodically this classification is reassessed to maintain the most faithful to existing field conditions. Its results are used for evaluations based on the proposed methodology and guides the definition of project criteria and dimensioning, governance requirements, risk management, monitoring and emergency preparation.

 

 

A Table 02 presents the classification of MRN structures as the Risk Category (CRI), the Associated Potential Damage (DPA) and the GISTM Consequences Classification.

Table 02 – Classification of EARs MRN via ANM and GISTM

MRN concluded the implementation of the 77 GISTM requirements after a structured program that involved gaps assessments, development of action plans, document review and strengthening of waste management processes. The case was completed in August 2025.

 

As part of the implementation of the governance structure, the MRN formalized the designation of roles and responsibilities foreseen in the standard. Among them stand out the Register Engineer (EoR), external and continuous technical responsible for the performance and safety of the structures; the Responsible Executive (AE), with responsibility for strategic decision-making related to the TSFs; the Technical Officer for Reject Storage Structures (RTFE), internal technical responsible and responsible for technical management and operational compliance and the Senior Independent Technical Reviewer (SITR), who works in critical analysis of the practices adopted and in support of continuous improvement. These roles have formally defined roles and responsibilities, ensuring a clear governance structure and contributes to the effectiveness of the management of waste storage structures.

 

MRN performs, through the Register Engineer (EOR), Regular Safety Inspections, every six months, in accordance with the periodicity and requirements established by the National Mining Agency (ANM). The results of these inspections are consolidated in the Regular Safety Inspection Report (RISR), a technical document that constitutes the technical basis for assessing the safety, operation, maintenance and monitoring conditions of the structures and subsidizes the issuance of the Stability Statement (SPD) by the technical officer. Currently, all MRN structures that are susceptible to the issuance of ECD have a positive Stability Condition Declaration, attesting to compliance with the safety requirements established by the current regulations.

 

MRN also performs the Periodic Dam Safety Review (RPSB), which consists of a comprehensive assessment of the safety conditions of structures, stability and performance, carried out in accordance with the periodic deadlines established by legislation and GISTM, aiming to verify the integrity of dams, identify opportunities for improvements to define preventive and corrective actions that contribute to the maintenance, safety and performance throughout its life cycle.

 

All structures of the MRN have a positive Stability Condition Declaration, attesting to compliance with the safety requirements established by the current regulations via the RPSB. A Table 03 presents the dates of the RPSBs in force by EAR.

 

Table 03 – Dates of the last RPSB performed by structure

 

The results of the RPSBs generally confirmed adequate safety and performance conditions consistent with regulatory criteria and good industry practice. The recommendations issued focused on the continuous strengthening of safety management systems, including improvements in geotechnical monitoring programs, instrumentation, periodic inspections, emergency plans update, with the aim of promoting continuous improvement and preventive risk management.

 

In general, the results of the RPSBs showed a management system oriented to the prevention, continuous monitoring and ongoing evolution of safety practices, contributing to the maintenance of the integrity of structures throughout their entire life cycle and to alignment with commitments established by the MRN in accordance with regulatory requirements and principles of the GISTM.

 

In addition to RPSBs, MRN structures undergo periodic independent reviews, through the performance of the Senior Independent Technical Reviewer (SITR), ensuring that critical decisions related to the project, operation, monitoring and closing of structures are evaluated independently and specialized. This figure acts as an extra layer in governance, reporting its conclusions to the Responsible Executive on waste management. Its performance takes place periodically evaluating the entire system.

 

During the last independent review process via SITR, critical assessments of strategic documents and strengthening technical governance of waste facilities were carried out. Among its main contributions are the review and issuance of technical comments to the Design Basis Report (DBR) and the review/validation of the classification of consequence of structures via GISTM.

 

Regarding risk management, MRN performs systematic evaluations in all its waste storage structures. Its periodicity is according to the GISTM classification. These studies are based on the FMEA methodology (Failure Mode and Effect Analysis) and also, in using the bow tie methodology to support its Risk Management Program for Mining Dams (PGRBM). The ALARP principle (The Low As Reasonably Practical), according to which risks should be reduced to a reasonably practicable lower level, considering the effectiveness of mitigation measures and the proportionality of the efforts necessary for their implementation.

 

Risk assessments also consider the identification and analysis of credible failure modes of structures, considering for management purposes those classified as credible. In MRN, the evaluated failure modes are: Installation, internal erosion, liquefaction and galging.

 

Based on geotechnical studies, it was demonstrated that the materials that make up the MRN structures do not present susceptibility to liquefaction, which is why this rupture mechanism is not considered credible in the risk assessments adopted. Thus, the types of failure evaluated are: instability, internal erosion and greying, which are analyzed for aspects of the environment, health, safety, population at risk and potential for loss of life.

 

The results of the evaluations indicate that the risks are at levels compatible with the acceptability criteria, being managed by governance processes. Residual risks are predominantly at levels Acceptable or Tolerable according to the ALARP criteria adopted in the study.

 

As a major practical example that corroborates the above paragraph, all structures of MRN meet the criteria of Maximum Probable Precipitation (PMP) with a minimum minimum free edge, even if by their GISTM classification it would not be necessary to meet this criterion.

 

With regard to regulatory compliance, the applicable MRN structures have positive Stability Condition Statement (SPD) and Operational Condition Statement (SPD) issued in accordance with the criteria and requirements set out in the current regulation.

 

With these initiatives, MRN reinforces its commitment to continuous improvement, remaining aligned with GISTM and best practices for the safe and sustainable management of its waste storage structures.

To support the Emergency Action Plan for Mining Dams (PAEBM), MRN performs in a predecessor manner, impact assessments and exposure of humans through hypothetical rupture studies with the main objective of identifying potentially impacted downstream areas in case of structural failure, focusing on the safety of people, communities and goods.

 

The hypothetical rupture studies performed by MRN address hydrodynamic modeling, in which they simulate different failure scenarios, considering the characteristics of structures, local topography and hydrological conditions. From these simulations are defined the Self-Saving Zones (ZAS) and the Secondary Security Zone (ZSS), as well as escape routes and evacuation measures. The studies follow the requirements of the National Mining Agency (ANM) and the guidelines presented by the National Water Agency (ANA), as well as good international practices.

 

Regarding the exposure of the population, hypothetical rupture studies indicate that there are no communities within the Self-Saving Areas (ZAS). Although there are no communities located within our self-leavening zones, the MRN adopts as good practice the participation of neighboring communities that are not in the ZAS to participate in their training and emergency simulations.

 

On the Saracá Plateau (East and West), studies indicate that the simulated scenarios do not impact cultural heritage sites, archaeological or speleological sites, or equipment with potential for contamination. No residences, traditional communities, or urban facilities were identified in the areas potentially affected by the flood zones. Although there is partial overlap between the ZAS and the left bank of the Saracá Stream, located within the Alto Trombetas II Quilombola territory, there are no records of occupation or activities in the impacted region.

 

The information generated by the studies, including flood maps, evacuation plans and signalling, is available to the public through the Integrated Mining Dam Safety Management System (SIGBM), as required by ANM. The studies are updated periodically or whenever there are relevant changes in structures or in the downstream context, ensuring the effectiveness of preventive and emergency response actions.

 

In possession of hypothetical rupture studies, MRN then develops the PAEBMs. In the system of their structures, they were divided into three Emergency Action Plans for Mining Dams (PAEBM), covering all the structures of the complexes Saracá East, Saracá West and Porto, elaborated in accordance with Resolution ANM no 95/2022 and its updates.

 

The plans establish procedures for identifying, communicating and responding to emergencies, including the definition of responsibilities, reporting flows, alert systems, escape routes, meeting points and other measures aimed at protecting potentially affected people, in order to complement the PAEBM.

 

MRN has the Technical Report on Complementary Actions for Response and Mitigation of Impacts that establishes guidelines for care in emergency scenarios. This document includes guidelines for search, rescue and assistance actions up to the performance of competent public agencies, care and reception, guarantee of the establishment of drinking water and other measures to mitigate environmental impacts, strengthening the company's response capacity.

 

The PAEBMs also establish the procedures for integration and communication with public agencies responsible for emergency management, including Civil Defense, Firefighters and Military Police, environmental agencies, city halls and other competent institutions, ensuring coordinated action during all phases.

 

EXERCISE

 

In compliance with the current legislation, the MRN carried out for each of its three PAEBMs (Saracá Leste, Saracá Oeste and Porto), a continuous emergency preparation program comprising complementary exercises.

 

The first is the Communication and Notification Flow Exercise, carried out periodically to verify the effectiveness of communication protocols, including the activation of internal response teams, high management teams, public bodies, as well as the validation of the flows and established media.

 

The second corresponds to the Hypothetic Internal Simulated Exercise, in which multidisciplinary teams evaluate simulated emergency scenarios, exercising decision-making, coordinating response actions and applying procedures established in the PAEBM, without the physical mobilization of workers.

 

The Practical Simulated Exercise is carried out in a field with mobilization and evacuation of the people present in the Self-Saving Zone. This exercise allows validating, under operational conditions, alert systems, escape routes and mobilization to the meeting points, in addition to the action of emergency teams.

 

In addition to the simulated ones, the actions foreseen in the PAEBMs, periodic training, and training activities of the teams are carried out continuously. The company also promotes guidance actions with communities located in the Secondary Security Zone (ZSS), through guidance seminars conducted in partnership with Civil Defense, reinforcing transparency and dissemination of information on emergency procedures.

 

RESULTS OF PAEBM PRACTICAL SIMULATED

 

Saracá East

In the Eastern Saracá system, the people potentially affected are exclusively MRN workers and contracted companies that access the operational areas of the structures in a possible way, characterized as floating population. There are no communities living in ZAS.

The practical simulations (Table 04) carried out demonstrate that the continuous evolution of team preparation and response capacity.

 

Table 04 – Results of the Saracá East Practical Simulations

 

Saracá West

As in the eastern Saracá, the people present in the ZAS are exclusively MRN workers and contractors who carry out operational activities (Table 05). The structures in Saracá West were built and became operational in 2024, therefore incorporating the PAEBM process.

 

Table 05 – Results of the Saracá West Practical Simulations

 

Port Dams

The Port dams have exclusive purpose of sediment containment for environmental control and because they do not store mining waste, they do not integrate the scope of GISTM application. However, these structures present the same criteria for action planning of responses to emergencies as the others.

 

Because there are no communities in the ZAS, during practical simulations there is no need to evacuate people from their homes. In addition, the company promotes orientation actions with the communities in the ZSS through seminars and institutional and technical visits at the Geotechnical Monitoring Center and field activities in the dams with monitoring of multidisciplinary teams, Geotechnics, Community Relations, Communication and Environment Team.

 

General Results

Over the period, 2,683 participations in practical simulations were mobilized between employees and service providers. In all exercises, the participants correctly followed the escape routes to the meeting points previously defined in the PAEBMs, demonstrating the effectiveness of alert and communication systems, as well as the high level of preparation of the teams for action in emergency situations. In the Port Dams, although there are no communities in the Secondary Security Zone (ZSS), the MRN performs informative actions in the Boa Vista, Boa Nova and Saracá communities, through seminars conducted in partnership with Civil Defense.

MRN maintains a comprehensive environmental and social management system, structured from environmental impact studies and commitments in licensing processes. The programmes are run by specialized technical teams and, where applicable, have the participation of quilombola and riverside communities.
Next, we present the main environmental programs implemented by the company and its most relevant results in 2025.

 

SILVESTRE FAUNA MANEJO PROGRAMME (PMFS)

This program aims to minimize the impacts of plant suppression on fauna by means of scare, rescue and release actions in authorized areas.

 

In 2025, 3,893 animals were rescued, of which 3,858 were returned to the natural environment, reaching a success rate of 99.2%, demonstrating the effectiveness of measures to protect fauna during plant suppression activities.

 

PROGRAM FOR MONITORING THE IMPACT OF ROADS ON WILDLIFE (PMIE)

This program aims to monitor the interaction of fauna with roads and railways, allowing the identification of critical areas and the implementation of mitigation measures.
In 2025, 455 individuals were registered using fauna passages, including endangered species such as jaguar (Panthera onca), sauim-de-Martins (Saguinus martinsi) and anta (Tapirus terrestris), showing the effectiveness of ecological connectivity structures.

 

FLORA RESPONSIBILITY, SALVATION, MULTIPLIFICATION AND REITERDUCTION PROGRAMME (PRSF)

This programme aims to promote the rescue and conservation of plant species affected by suppression activities, with special focus on rare, endangered or ecologically interesting species.

 

In 2025, 6,023 individuals belonging to 96 species were rescued, of which 3,404 were reintroduced in restoration areas. In addition, 13,549 individuals were produced in specialized nurseries and 9,471 individuals were introduced in the field, strengthening conservation and environmental recovery actions.

 

ECOLOGICAL RESTAURATION MONITORING PROGRAMME (PMRE)

The Program is developed by the adoption of about 45 indicators of fauna, flora and soils, evaluated jointly in 15 sub-attributes and six key attributes that reflect the degree of ecological restoration (return of ecological functions) of the areas after the cessation of tilling and replanting. These key attributes receive a classification of 1 to 5 stars, evaluated each year of monitoring and compared to the goal of achieving the closest possible degree of the pristine area. In 2025, four plateaus were evaluated that contain areas in recent planting and/or still maintain some degree of use for accesses, processing and/or still in tillage (Aramã, Bela Cruz, Monte Branco, Saracá). The results show that in general, several attributes have a satisfactory degree of restoration, in some plateaus with more recent planting ages (5 and 13 years), to an advanced degree of restoration (> 40 years) of the first planting in the areas, as follows:

 

 

DEGRADED AREA RECOVERY PROGRAMME (PRAD)

The program aims to restore the structure and functionality of ecosystems impacted by mining operations.

 

In 2025, 527,745 seedlings were produced from 108 native species, prepared 213 hectares for recovery and planted 446,250 seedlings in mined areas. The program also carried out actions to control invasive species, revegetation of slopes and forest enrichment by direct sowing.

 

ENVIRONMENTAL EDUCATION PROGRAMME (PEA) – SILVESTRY ANIMALS AND ENVIRONMENTAL EDUCATION PROGRAMME FOR WORKERS (PEAT)

With a focus on environmental awareness, the PEAT enabled collaborators on the implications of environmental damage and risks arising from the enterprise in the physical-natural and social environments in its area of influence.

 

In 2025, 362 workers were trained directly, 844 participated in sensitization activities through Daily Security Dialogues (DDS) and approximately 1,973 people were reached by educational campaigns.

 

AIR QUALITY MONITORING PROGRAMME (APM)

Performed weekly, the program aims to monitor Total Particles in Suspension (PTS) and Particulate Material (MP10) in the operational areas and the surroundings. In 2025, 15 points were monitored for air quality, of which one is located on the Saracá Plateau. As part of the control actions of dust dispersion, especially during the dry period, MRN performs measures such as wetting of roads and road maintenance.

 

SOLID WASTE MANAGEMENT PROGRAMME (PGRS)

The waste management of MRN is carried out through the Waste Industrial Waste Center (CRID) for the internal management of industrial waste and the Waste Treatment Center (CTR) for urban waste, focusing on the reduction, reuse and environmentally appropriate disposal of waste generated.

 

As a result of the improvements implemented in 2025, 99.8% of the industrial waste generated was destined for recycling, reuse, reprocessing or refining. The actions also contributed to extend the life of the industrial landfill from 24 to 36 months.

 

CONTROL AND HYDRICAL MONITORING PROGRAMME (HPM)

Water management is one of the pillars of the environmental performance of MRN. To ensure compliance with the parameters required by the water resources legislation, the MRN implements the Water Monitoring Program, which aims to monitor and evaluate the quality of surface and groundwater, as well as the variation of fluviometric levels of the watersheds located around its activities.

 

In 2025, 88 surface water points (rivers and rivers) and 99 spring points were monitored, totaling 37,317 analyses. Of this total, 8 creek points and 12 spring points are located in the Saracá Plateau, corresponding to 3,626 analyses, which showed compliance rates higher than 95%. The main deviations, such as pH, aluminum and iron distributed, were associated with the natural characteristics of the soils of the Amazon region, and not with mining activity.

 

The analyses follow standardized methodologies (NBR and Standard Methods) and the parameters monitored meet CONAMA Resolution no 357/2005.

 

CONTROLED FRUIT

Vertification monitoring is a preventive measure of MRN to ensure the stability of diluted waste tanks and recirculation lakes. The spills occur during periods of heavy rain, when the reservoir levels approach the operational limits. In 2025, the drops occurred between the months of March and May, due to the accumulation of rainwater in urban lakes, Pater and Saracá Oeste. In this period, 973 analyses were performed, which showed compliance rates higher than 95%.

 

The main deviations observed were related to pH, aluminum and iron parameters, which were associated with the natural geochemical characteristics of the region, and not with relation to mining activities.

 

SOCIAL PROGRAMS

CORPORATIVE SOCIAL RESPONSIBILITY

Relationship with communities is a fundamental element of the social and environmental management of MRN. The company maintains permanent dialogue with quilombo communities, riverside communities and family farmers through structured engagement processes and specific communication channels.

 

In 2025, 46 engagement actions were carried out in the municipalities of Oriximiná, Terra Santa and Faro, involving 43 communities located in areas of direct and indirect influence. The initiatives strengthened the relationship channel "FALAI Community!" and expanded transparency and social participation in the activities developed by the company.

 

MRN also promotes institutional visits to its operations, allowing community representatives to know the forest nursery, bauxite waste storage structures and the Geotechnical Monitoring Center (CMG). In 2025, 05 visits were carried out with the participation of community representatives from the region.

 

As part of its social investment strategy, the company develops initiatives aimed at education, income generation, community strengthening, food security, entrepreneurship, health and environmental conservation. Among the highlights of 2025 are:

• Education project by Amazonia, which benefited more than 300 people through courses of professional qualification and basic education;
• Project Maria Pixi, focused on food security, agroforestry systems and community-based tourism;
• Programa Grandes Entrepreneurimentos – Childhood, developed in partnership with Childhood Brazil to prevent violence against children and adolescents;
• Empreneur Network of Amazon Women (REMA), which directly mobilized 322 women in training and productive inclusion actions;
• Seed Network Sapucua, strengthening the production chain of native seeds and the generation of community income;
• Community infrastructure projects with improvements in water supply systems, electricity and community equipment;
• Socioenvironmental Education Program (ESS), with actions aimed at environmental education, health, income generation and strengthening of communities in the area of influence.

 

As a complement to the initiatives of engagement and social investment, MRN develops the Social Environmental Education Program (ESS), implemented in compliance with the constraints of federal environmental licensing. The program brings together projects aimed at education, health, environment, food security, access to water and income generation, contributing to the sustainable development of communities located in the company's area of influence.

 

In 2025, the actions of the Environmental and Heritage Education Project (PEAP) stood out, with the realization of 64 workshops aimed at cultural valorization and community training, directly benefiting residents of local communities. The Environmental Education Project (EPA) promoted awareness activities on fauna, flora and environmental conservation through workshops, lectures and distribution of educational materials.

 

In the axis of income generation and productive strengthening, the MRN supported initiatives of melipon farming, family farming and fish farming, offering technical assistance, training and supply of inputs to rural and quilombola communities. The fish farming project, for example, served three communities and eight families, with 56 technical advice and training of 31 participants.

 

In the area of infrastructure and quality of life, the Microsystem Project expanded access to drinking water through the implementation of community supply systems, directly benefiting 19 families from the regions of Lake Sapucuá and Lake Potato. In parallel, the Malaria Combat Project carried out vector prevention and control actions in 16 locations, with 227 properties visited and more than 3,700 larval surveys conducted, contributing to the maintenance of low rates of the disease in the region.

 

These initiatives reinforce the commitment of the MRN to the development of communities, promoting improvements in living conditions, strengthening the local economy, environmental education and conservation of natural resources, in line with its commitments of sustainability and relationship with stakeholders

Mining Rio do Norte (MRN) maintains sound and structured financial management, with monthly reviews aimed at planning the closure of mines. This practice ensures compliance with the technical, environmental and social obligations associated with waste storage structures and auxiliary installations. The commitment to financial responsibility is reaffirmed annually through the publication of the Financial Administration Report, whose edition of 2026 is available on the company's institutional website (www.mrn.com.br).).

 

MRN provides resources in a structured manner to meet the commitments associated with the different phases of its facilities' life cycle, including planned closure, early closure, recovery, and post-closure. This financial commitment is reflected in Explanatory Note No. 16, which presents the amounts duly recorded for asset decommissioning, including the technical decommissioning of structures, the implementation of socio-environmental programs, waste management, and the restoration of mined areas.

 

The corporate structure consists of three shareholders of global relevance in the mining and metals sector: Glencore (45%), South32 (30%) and Rio Tinto (25%). In addition to integrating the company's corporate structure, these shareholders play an active role in institutional strengthening, providing financial support through corporate guarantees proportional to their respective shareholders. This commitment is reflected in the financial statements of the company, especially in Explanatory Note No 29, which records the direct action of shareholders in operations with financial institutions and in support of structuring projects aimed at continuity and sustainability of operations.

 

In 2025, the company invested R$ 810.9 million, already net of recoverable taxes, distributed in 460 projects of different nature, ensuring the maintenance of the productive capacity of the business.

 

Of the total invested, 27% were directed to waste reservoirs, 40% were attributed to operational assurance, 10% to mining equipment, 10% to projects related to new mines, 7% to initiatives including health, safety, infrastructure and technological update, and 6% to other initiatives including environmental projects.

 

MRN reaffirms its commitment to financial strength, regulatory transparency, and value creation for its shareholders, communities, and other stakeholders, ensuring the necessary resources for the responsible, safe, and efficient management of its structures.