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Talvivaaran Kaivososakeyhtio Oyj Detects Leakage at Sotkamo Mine's Gypsum Pond

Monday, 8 Apr 2013 03:55am EDT 

Talvivaaran Kaivososakeyhtio Oyj announced that a leakage has been detected at the gypsum pond of its Sotkamo mine on evening April 7, 2013. The leakage is located at the pond section adjacent to the section where a leakage occurred in November 2012, and is potentially linked to the previous leakage. The Company estimates that approximately 250,000 cubic meters of water has leaked from the pond and that the remaining water volume in the pond section is approximately 370,000 cubic meters. The safety capacity at Talvivaara's Southern water treatment unit is approximately 1,000,000 cubic meters and also the water treatment capacity to treat the water leaking into the dams is sufficient. No untreated water is therefore expected to be directed outside of the mine area. The leakage however consumes safety capacity in advance of the spring melt, and the Company has therefore increased discharge of purified water to the Southern direction to approximately 800 cubic meters per hour and the discharge rate is estimated to be further increased to approximately 1,500 cubic meters per hour later in the week. The Company has focused on maximizing safety capacity in dams through improving dam structures, increasing water neutralization capacity and discharging treated waters. Under normal circumstances the water in the gypsum pond would have been treated at the metals recovery plant, but will be neutralized at the Southern water treatment unit instead. 

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