Geophysical Investigations in the Vicinity of the Kotalahti Mine Tailings Landfill
J.M. Lerssi and T. Huotari
Event name: 24th European Meeting of Environmental and Engineering Geophysics
Session: Investigations of Landfills, Urban Areas & Industrial Sites I
Publication date: 09 September 2018
Info: Extended abstract, PDF ( 2.54Mb )
Price: € 20
Geophysical investigations near the Kotalahti mine were made to find out and map seepage paths from the tailings landfill towards to Lake Valkeinen. Investigations included electromagnetic GEM-2 and VLF-R methods as well as Electrical Resistivity Tomography (ERT). Near surface seepage was clearly observed by electromagnetic GEM-2 measurements. The near surface seepage and possible deeper parts of the seepage were extracted and mapped by VLF-R and ERT measurements. Further, both methods revealed conductive zones at the edge of gabbro formation. Despite of complex bedrock geology, on the grounds of research results it was possible to detect significant seepage of conductive waters from tailings landfill area into the Lake Valkeinen. These have remarkable impact on the contamination of this small lake.