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Talvivaara Gypsum pond leakage has been stemmed


April 9, 2013 - London

Stock Exchange Release
Talvivaara Mining Company Plc
9 April 2013

Gypsum pond leakage has been stemmed

Talvivaara Mining Company Plc ("Talvivaara" or the "Company") announces that the gypsum pond leakage detected on 7 April 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 8 April 2013, after which the Company started to fill the leakage point with moraine. On the basis of current knowledge Talvivaara estimates that the water volume leaked to the safety dams is less than 400,000 m3. The total water volume of the pond section where the leakage occurred is estimated at approximately 620,000 m3. 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 highly important in view risk management. This is especially important in anticipation of the spring melt, which is expected to accelerate late this week. Talvivaara has therefore increased the discharge of purified excess water to the Vuoksi waterway in the South to a level of 800 m3/h and the flow rate will be further increased to a level of 1,500 m3/h to ensure sufficient 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.

Enquiries
Talvivaara Mining Company Plc Tel +358 20 7129 800
Pekka Perä, CEO
Saila Miettinen-Lähde, Deputy CEO and CFO

Talvivaara Mining Company Plc
Talvivaara Mining Company is an internationally significant base metals producer with its primary focus on nickel and zinc using a technology known as bioheapleaching to extract metals out of ore. Bioheapleaching makes extraction of metals from low grade ore economically viable. The Talvivaara deposits comprise one of the largest known sulphide nickel resources in Europe. The ore body is estimated to support anticipated production for several decades. Talvivaara has secured a 10-year off-take agreement for 100 per cent of its main output of nickel and cobalt to Norilsk Nickel and entered into a long-term zinc streaming agreement with Nyrstar NV. Talvivaara is listed on the London Stock Exchange Main Market and NASDAQ OMX Helsinki. Further information can be found at www.talvivaara.com.

Talvivaara Gypsum pond leakage has been stemmed 9.4.2013



This announcement is distributed by Thomson Reuters on behalf of Thomson Reuters clients.

The owner of this announcement warrants that:
(i) the releases contained herein are protected by copyright and other applicable laws; and
(ii) they are solely responsible for the content, accuracy and originality of the
information contained therein.

Source: Talvivaaran Kaivososakeyhtiö Oyj via Thomson Reuters ONE

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