The former mining area of Argozelo has been the subject of two major environmental remediation operations, which consisted of the following main activities:
- Implementation of actions defined in the Technical Cooperation Protocol between the Ministry of Cities, Territorial Planning and Environment, Vimioso City Council and the former EXMIN, to be funded by the POA and the Environment Institute. These actions were reflected primarily in the preparation of engineering projects and the completion of the works themselves, integrated into a general remediation plan;
- Completion of a borehole for connecting the leachate collection tank to the Leitarães gallery;
- Construction of a basin for precipitation, making use of the entire length of the Leitarães gallery. The discharge is made through a spillway located at the mouth of the gallery;
- Construction of a limestone bed between the mouth of the gallery and the macrophyte pond to increase the pH and precipitation of the metals;
- Construction of an excavated macrophyte pond in the area of the waterproofed spoil heap. The supporting layer of the pond consists of Typhas and Juncus;
- Construction of a cascade between the pond spillway and the river;
- Installation of a mine water treatment plant (MWTP).
These two contracts were awarded to the consortium Jeremias de Macedo & Cia, Lda / MT3 – Engenharia e Obras, Lda (spoil heaps and heritage) and to MT3 – Engenharia e Obras, Lda. (MWTP), for the total amount of € 1,723,333.52 and a total duration of 270 days.
The investments made were co-financed by the Environment Operational Programme (POA) under the Third Community Support Framework, and allowed the environmental liabilities resulting from mining at this location to be resolved, bringing benefits to local populations through the improvement of current conditions and use of the areas reclaimed for other ends.