Talvivaaran Kaivososakeyhtiö Oyj : Talvivaara Mining Company Plc: Leakage detected at Talvivaara mine's gypsum pond

  Talvivaaran Kaivososakeyhtiö Oyj : Talvivaara Mining Company Plc: Leakage
                  detected at Talvivaara mine's gypsum pond

Stock Exchange Release
Talvivaara Mining Company Plc
8 April 2013

              Leakage detected at Talvivaara mine's gypsum pond
 - safety capacity in dams and water treatment capacity sufficient to manage
                                 the leakage

Talvivaara Mining Company Plc ("Talvivaara" or the "Company") announces that a
leakage has been detected  at the gypsum  pond of its  Sotkamo mine on  Sunday 
evening 7 April 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  m3 of water has leaked  from 
the pond by now  and that the  remaining water volume in  the pond section  is 
approximately 370,000 m3. The safety  capacity at Talvivaara's Southern  water 
treatment unit  is currently  approximately 1,000,000  m3 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  m3/h and  the  discharge  rate  is 
estimated to be  further increased to  approximately 1,500 m3/h  later in  the 

As the risk level of the leaking  pond section has been known to be  elevated, 
the Company has during the current year 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 now be neutralized at the Southern water treatment unit instead.

Pumping arrangements at Talvivaara's metals recovery plant are currently being
altered such that water  purification capacity at the  plant can be  maximized 
and as  much as  possible  of treated  water can  also  be discharged  to  the 
Northern direction.

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.

Leakage detected at Talvivaara mine’s gypsum pond 8.4.2013


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Source: Talvivaaran Kaivososakeyhtiö Oyj via Thomson Reuters ONE
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