• Tailings are the solid waste produced at our primary mineral separation and concentration operations. This waste must comply with strict technical requirement in terms of site selection for final disposal, construction, safe operation, monitoring to prevent risks, a closure plan that reintegrates the area into the natural landscape safely, and a post-closure plan that guarantees no impacts once the site has been abandoned.
• The stability of the structure is prioritized in the design, to ensure the tailings dams are not affected by earthquakes or extraordinary weather events, among other risks. For this reason, the construction and maintenance include rainwater diversions and overflow channels at the larger dams.
• For their closure, we use native plant species to reforest and we cover the area with natural material to prevent erosion from the wind and to reintegrate the area into the natural landscape.

Once they are abandoned, the mine waste deposits are subject to natural phenomena while they are adapting to the natural landscape that surrounds them. To ensure this occurs safely and successfully, we periodically calculate and adjust the closure costs for our operations, including dismantling some structures and stabilizing others, the reintegration into the natural landscape, and monitoring the quality of water at the sites we abandon.

The Community Development department implements the Sustainability Plan for the closure phase, which includes:

• Implement the Community Development model with a Social Management Plan.
• Encourage the neighbor communities to diversify their economic activities to reduce their vulnerability when the mine closes.
• Maintain a reporting and response system for communities to share their grievances and expectations.
• Assess the post-closure impacts on the areas of influence.
• Transfer the social and sustainable legacy to the local communities and authorities.