The intervention in this mining area took place in two stages, whereby, during the first stage, between January 2007 and April 2008, all mining heap materials were confined by removing and compacting them into the open cut. The second stage of the intervention began on 3 June 2008, with the lining, drainage and landscaping of the mining heap. The work carried out comprised the following main activities:
- Excavation of the poor ore and its placement in a dump, which includes the removal, transport and disposal with compaction in the open cut of the poor ore mining heap, according to a sequence defined by the radioactive materials;
- Excavation of the remaining material and its placement in a dump, which includes the removal, transport and disposal with compaction in the open cut of the remaining material, with lower levels of radioactivity;
- Lining, drainage, access road and restoration of the landscape, which includes the execution of the final cover system, the installation of the drainage system, the installation of piezometers for monitoring, the execution of an access road and revegetation work.
This work was awarded to the consortium Tecnovia – Sociedade de Empreitadas, SA / LTO – Lavouras e Terraplenagens do Oeste, Lda. for an amount of € 2,107,626.55 and had a duration of 300 days.
The investment was co-financed by the Environment Operational Programme under the Third Community Support Framework, and allowed the correction of the geotechnical instability of the slopes of the spoil heap, as well as the resulting visual impacts, proper handling of the existing surface acid mine drainage and in improvement of the safety conditions for the circulation of people and animals.