[Article 05 of 05] The Mining Supply Chain: Mine Closure, Environmental Rehabilitation, and Sustainable Innovation

Mine closure and environmental rehabilitation represent the final stage of the mining production chain, but they must be planned from the outset. More than just the closure of activities, this process seeks to return the exploited area to society in adequate environmental and safety conditions, ensuring the reduction of liabilities and the socio-environmental sustainability of the territory.

Mine Closure and Environmental Rehabilitation

Geological Hazards

In the geological aspect, one of the main risks is associated with acid rock drainage (ARD) generation, caused by the oxidation of sulfide minerals in contact with water and oxygen. This reaction can release contaminants and compromise waterways, making rehabilitation more complex and costly. Furthermore, the presence of fractures and aquifers can favor the percolation of contaminants, requiring specific containment and monitoring solutions.

Geotechnical Risks

From a geotechnical perspective, mine closure requires special attention to the long-term stability of slopes, waste rock piles, and tailings deposits. Lack of maintenance can result in:

• Erosions in exposed areas.
• Landslides or collapses in inactive structures.
• Subsidence and collapses in underground mines.
  

Even after operations cease, risks persist and require continuous monitoring, as well as definitive stabilization projects. The success of this phase depends on robust technical solutions, long-term analyses, and ongoing safety measures.

Financial Risks

Financially, closure is often underestimated, leading to unprovisioned costs that can compromise the project's financial balance. Drainage, revegetation, environmental compensation, and continuous monitoring systems represent significant expenses. These costs are often higher than initial forecasts, and, when neglected, they become decades-long environmental liabilities, accompanied by fines, lawsuits and loss of institutional credibility.

Therefore, closure and rehabilitation must be treated not only as a legal obligation, but as part of a sustainability, reputation and continuity strategy of the mineral sector.

Innovation and Sustainability in Mining

At the same time, innovation and sustainability have become indispensable pillars for the competitiveness and social acceptance of modern mining.

Technological Advances

From a technological perspective, digital tools, automation, and remote monitoring systems have increased the accuracy of geological and geotechnical models, reducing uncertainties and enabling rapid responses to identified risks. Furthermore:

1. More efficient beneficiation technologies.
2. Reuse of waste in production processes.
3. Integration into the logic of the circular economy.
   

These advances reduce the generation of liabilities and increase operational efficiency.

Socio-environmental Perspective

From a socio-environmental perspective, regulatory pressures and societal demands have driven the incorporation of environmental practices. ESG (Environmental, Social and Governance)This involves:

• Reducing carbon footprint and using water efficiently.
• Reuse of materials and waste.
• Development of community initiatives in areas of mine influence.

Innovative solutions, such as dry stacking, autonomous mining, and the use of renewable energy, strengthen the operational resilience and social legitimacy of the activity.

Financial Aspects

From a financial perspective, investing in innovation and sustainability isn't just a competitive advantage: it's a prerequisite for remaining in the global market. Companies that adopt these practices attract greater investor interest, have easier access to credit lines, and reduce their exposure to regulatory and reputational risks. Thus, innovation and sustainability are no longer just a response to external pressures, but rather a fundamental part of the company's business. essential strategy to consolidate mining as a viable, balanced and responsible activity.