Talvivaaran Kaivososakeyhtiö Oyj - Company Announcement

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.

[HUG#1691501]

Attachments:

Talvivaara Gypsum pond leakage has been stemmed 9.4.2013.pdf