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


U.S. Environmental Protection Agency
U.S. EPA Technology Innovation and Field Services Division

Search Result

WATER QUALITY IN THE FREIXEDA ABANDONED GOLD MINE AFTER REMEDIATION
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.



The Technology Innovation News Survey welcomes your comments and suggestions, as well as information about errors for correction. Please contact Michael Adam of the U.S. EPA Office of Superfund Remediation and Technology Innovation at adam.michael@epa.gov or (703) 603-9915 with any comments, suggestions, or corrections.

Mention of non-EPA documents, presentations, or papers does not constitute a U.S. EPA endorsement of their contents, only an acknowledgment that they exist and may be relevant to the Technology Innovation News Survey audience.