Talvivaaran Kaivososakeyhtio Oyj Stops Pond Leakage

Tuesday, 9 Apr 2013 04:29am EDT 

Talvivaaran Kaivososakeyhtio Oyj announced that the gypsum pond leakage detected on April 7, 2013 at its Sotkamo mine has, based on current knowledge, been successfully stemmed. The leakage point in the pond was detected in the afternoon of April 8, 2013, after which the Company started to fill the leakage point with moraine. The Company estimates that the water volume leaked to the safety dams is less than 400,000 cubic meters. The total water volume of the pond section where the leakage occurred is estimated at approximately 620,000 cubic meters. The safety capacity and treatment capacity at the water treatment units are sufficient for treating the water that has leaked and may still leak from the gypsum pond section in question. No untreated water is expected to be directed outside of the mine area. Sufficient safety capacities in the Southern safety dams are important in view risk management. This is important in anticipation of the spring melt, which is expected to accelerate late during the week. The Company has therefore increased the discharge of purified excess water to Vuoksi waterway in the South to a level of 800 cubic meters per hour and the flow rate will be further increased to a level of 1,500 cubic meters per hour to ensure safety capacity. The levels of harmful substances in discharged waters are clearly below the limit values set in Talvivaara's environmental permit. Water quality has remained consistent and quality monitoring is carried out continuously. 

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