Location
Mirandela and Vila Flor (Municipalities)
Investment
198,350.11 €
2007 - 2007

Environmental Remediation of the Freixeda Mining Area

Concluded

This former mining area is located in the civil parishes of Freixeda and Trindade, respectively, which belong to the municipalities of Mirandela and Vila Flor, in the district of Bragança. The mine forms part of the Minerals Deposits – Defence and Protection Zone, the southern portion of the mining area forms part of the REN (National Electric Network), while the northern boundary faces the RAN (National Agricultural Reserve) area.

It was first mined by the Romans and, more recently, in the 1950s, and produced between 1952 and 1955 80 kg of gold (Au), 2 tons of silver (Ag) and 70 tons of lead (Pb) in two thin veins ranging from a few centimetres to 0.60 m. The material was mined in the galleries and treated at the mining facilities located in the central zone of the mining area. The mineral matter resulting from the washing process was deposited in a silt dam, taking advantage of the steep slope of the local valley line.

This environmental remediation work consisted of the forming, sealing and packing of shafts and galleries, the construction of drains, treatment of sewage from the mine and revegetation, as reflected by:

  • Modification of the forming in order to reduce the sealing and containment area of the silt dam;
  • Sealing and packing of shafts and galleries;
  • Construction of surface and floor drains;
  • Construction of enclosures in industrial buildings;
  • Treatment of mine drainage water;
  • Revegetation.

This contract was awarded to the consortium Ricobra Construções, Lda / Sousa Resende & Robrigues II Construções e Obras Públicas, SA for 198,350.11 and had a duration of 180 days.

The investment made was co-financed by the Northern Regional Operational Programme under the Third Community Support Framework and enabled the creation of general conditions of safety, given the proximity of this mining area to a residential area, and the attenuation or reversal of environmental damage and also the mitigation of impacts of a visual and landscape-related nature.

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