Compliance and Risk Management for Environmental Incidents

Technology and Monitoring: Rigorous Management

Compliance and risk management related to environmental incidents are central to our strategy, bringing together the control of emissions and effluents and soil protection under a framework of continuous improvement. To ensure operational discipline and consistency in our business, we use the PDCA method and an Integrated Management System that ensures strict compliance with environmental laws and industry best practices at all our locations.
Our system establishes clear goals and integrates risk management with compliance with legal requirements, relying on periodic audits and active environmental management plans at 100% of our operating units. In 2025, we will take this a step further by introducing a heatmap to identify sensitive areas and address contingencies, using tools such as the Siclope platform to monitor our actions and strengthen a culture of preservation and safety in our operations.

Actual Impact

Operations are conducted under strict environmental controls and in compliance with applicable laws, with a focus on managing air emissions and the treatment of effluents and waste. Nexa maintains monitoring and prevention systems to protect air, water, and soil quality, even in exceptional situations or extreme weather events, thereby strengthening the environmental resilience of its operations.

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Provision for closure and rehabilitation

Correlated indicators

GRI Dimension:

Environmental

GRI Code:

14.8.8

Closure Plans¹
	2023	2024	2025
Percentage of operations that have closure plans	100%	100%	100%
Financial provisions made by the organization for closure (US$)²	307,797.000	100,118.110	252,231.485

¹ Provisions are made based on the estimated net present value for the execution of decommissioning actions, which are periodically reviewed and updated. ² The 2024 figures include only mining operations, namely: Aripuanã and Vazante in Brazil, and El Porvenir, Atacocha, and Cerro Lindo in Peru. A provision of USD 32,033,893 has also been made for non-operational facilities in Peru, bringing the total to USD 132,152,003..

Number and percentage of total sites identified as requiring biodiversity management plans according to stated criteria, and the number (percentage) of those sites with plans in place

Correlated indicators

GRI Dimension:

Environmental

GRI Code:

MM2

Areas with Biodiversity Management Plans (BMP)
	2023	2024	2025
Percentage of units that have a BMP in force	100%	100%	100%

Description of environmental management policies and practices for active sites

Correlated indicators

Sector SASB:

Mining and Metals

SASB Dimension:

Impacts on biodiversity

SASB Code:

EM-MM-160a.1

SDG

Nexa implements an integrated environmental management system across all active sites, covering the construction, operation, phased closure, and final closure phases, with the aim of preventing, mitigating, controlling, and monitoring environmental impacts. The corporate Environmental Management System (EMS) ensures compliance with internal standards and applicable legislation, including monitoring of legal requirements, internal and external audits, field inspections, and ongoing training.

The Environmental Management Plans (EMP) and Environmental Management Instruments (EMI), approved by regulatory agencies such as SENACE, MINAM, MEM, and ANA, establish guidelines for air quality management, monitoring of surface and groundwater, solid and hazardous waste, effluents, noise, vibrations, biodiversity, wildlife management, natural resource consumption, and control of hazardous substances. The implementation of these plans ensures that environmental impacts are addressed preventively and that corrective measures are applied immediately when necessary.

Operations include programs for the restoration of degraded areas, biodiversity monitoring, control of air emissions, and water resource management, in order to reduce environmental risks and promote sustainability. The Mine Closure Plan ensures the physical, hydrological, and geochemical stability of the components at the end of the operational cycle and is developed progressively.

For more information, please review our Integrated Management Policy.

Risks

Contamination of water resources and soil

Our performance

Examples of ongoing decommissioning plans at Nexa include the Santa Rosa and Sinaycocha units, both in Peru, which are conducting their final decommissioning works, to be carried out from 2022 to 2024. After this period, post-decommissioning monitoring will begin.

Another example is the Chapi unit, also in Peru. Currently, it is not operating and has been carrying out the closing works, in accordance with the commitment assumed in the approved decommissioning plan.

Our aspiration

Our aspiration is to implement a closure management system that considers the particularities of each of our operations, in a committed and responsible manner with socio-environmental issues.