Talvivaaran Kaivososakeyhtiö Oyj : Talvivaara Gypsum pond leakage has been stemmed

  Talvivaaran Kaivososakeyhtiö Oyj : Talvivaara Gypsum pond leakage has been
                                   stemmed

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

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Source: Talvivaaran Kaivososakeyhtiö Oyj via Thomson Reuters ONE
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