Management and restoration of surface water bodies receiving mine waters – lessons learned from Talvivaara mine impacts northern part of Finland.

Theme 1. Environmental protection
Session Name 1.8 Modelling and control of water and wastewater treatment in the Arctic conditions
Presentation Type Oral
Author(s) Seppo Hellsten (Finnish environment institute, Finland), Tommi Kauppila (Geological Survey of Finland, Finland), Tero Luukkonen (University of Oulu, Finland), Janne Juntunen (Finnish environment institute, Finland), Markus Huttunen (Finnish environment institute, Finland)
Abstract text

Mining has increasing role in use of northern natural resources. Environmental effects of mining activities are usually well predicted in environmental impact assessment and permission. Management of mine water discharges in their recipient surface water bodies is often the weakest link in assessment and mines with zero aquatic emissions are not feasible in Finnish climatic conditions. In this study we present main impacts of Talvivaara metal mining activities on nearby watercourses including also the effects of gypsum pond leakage autumn 2012. In general mine waters are usually reactive, include high content of salts and bioaccumulative elements such as metals. Recipient water bodies are often small and easily stratified permanently as noted also near Talvivaara mine. Therefore the main focus should be in calculation of dilution and other properties of mine waters including lake stratification models. Modelling tools to estimate the effects on the lakes and some preliminary lake restoration methods are also presented in this study.

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