In an area of 41.5 hectares, about 41 thousand seedlings of 30 native species were planted
The planting of native species on the margin of the Gualaxo do Norte River, a sub-affluent of the Doce River affected by the tailings of the Fundao Dam, in Mariana (MG), presented a 95% survival rate, indicating a low seedling mortality rate. The technique prevents erosion of the riverbank, which makes it more difficult for tailings to slide into the water and minimizes turbidity, besides having a function of structuring the landscape. It also contributes to the return of biodiversity.
The planting began in February 2018, under the supervision and technical guidance of Sebastiao Venancio, professor of the Forestry Engineering Department at the Federal University of Vicosa (UFV). In an area of 41.5 hectares, about 41 thousand seedlings of 30 native species were planted. To guarantee a good growth of the plants, the Renova Foundation has used state-of-the-art technology in the ecological restoration of the impacted area. “One of them is the use of hydrogel, a type of polymer that, mixed with water, turns into a gel. The gel reduces the loss of water and nutrients, as it increases the water storage capacity of the soil. Water and nutrients are longer available to the roots”, explains Prof. Venancio.
The area that serves as a pilot for tailings management works is called “stretch 8” and is close to the Small Hydroelectric Power Plant (PCH) in Bicas, district of Camargos. The actions of the Renova Foundation included in this plan feature the enrichment of vegetation with native species (yellow and green ipe, pata-de-vaca, inga and embauba) on banks and plains, as outlined in the document submitted to the Technical Board for Tailings Management and Environmental Safety of the environmental agencies.
The solutions for the tailings that have spread to the main rivers and their tributaries were included in the Tailings Management Plan, approved in June 2017 by the competent environmental agencies, and the affected region was divided into 17 stretches.