U.S. EPA Contaminated Site Cleanup Information (CLU-IN)

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Gosar, D. and M.R. Costa.
International Conference on Groundwater in Fractured Rocks, Chaves, Portugal, June 2017

At the Freixeda abandoned gold mine in Portugal NE, mine closure happened in 1955. Remediation processes of containment and control of tailings and phytoremediation with macrophytes in a wetland were carried out in 2007. Water samples collected in 2015, about 8 years after site remediation, showed that concentrations of heavy metals in the Freixeda stream had declined over time, and the Zn, Pb, Cd, and Cu concentrations in water were below the limit values for human consumption aside from the increased value of As. Higher As concentrations were attributed to acid mine drainage (AMD) inflow from the mine into the Freixeda stream and to the discharge from a confined aquifer. Treatment of AMD at the site is no longer effective due to lack of maintenance.

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