STOCK EXCHANGE RELEASE

11 February 2010 at 6:00 am UK / 8:00 am Finland


         Production stoppage at hydrogen plant due to catalyst failure

                  Bioheapleaching progressing ahead of budget


Talvivaara  Mining Company Plc ("Talvivaara" or  the "Company") announces that a
production  stoppage in metals recovery is ongoing  due to a catalyst failure at
the  hydrogen plant.  This is  anticipated to  defer, depending  on the eventual
length  of  the  stoppage,  around  1,000 tonnes  or  more of the planned nickel
production  from Q1  2010 until later  in the  year. Talvivaara's operations are
covered  by customary  insurance policies  against property  damage and business
interruption.



Talvivaara's  operating personnel detected elevated  temperatures in some of the
hydrogen plant's reform tubes at the end of January 2010. Following consultation
with  the manufacturer,  the plant  was shut  down for  inspection and  to avoid
further  damage. Subsequent investigations revealed  that the sudden increase in
temperature  was caused by  impurities in the  propane that was  used as the raw
material  for hydrogen production.  The high temperatures,  in turn, damaged the
catalyst  in the reform tubes.  It was concluded that,  as a corrective measure,
all of the catalyst inside the reform tubes had to be replaced.



New  catalyst material  has now  been delivered  at the  mine site  and is being
installed. Re-start of the hydrogen plant and the Company's metals precipitation
is anticipated to take place by the end of next week.



The  Company believes that some or all of the production deferred as a result of
the  hydrogen plant  failure can  be caught  up during  Q2 2010 thanks to recent
bioheapleaching  performance which has exceeded the budgeted levels by more than
20%. In  December 2009 and January 2010, nickel grade in the solution fed to the
metals  recovery plant remained around 1.2 g/l, reflecting a large proportion of
the  heap  being  newly  stacked  and  still precipitating rather than releasing
metals.  Following completion  of stacking  of the  second heap section in early
January  2010, all of the existing heap is  now reaching a steady leaching phase
and the nickel grade in solution available for metals recovery has quickly risen
to  1.8 g/l. The  increase in  grade being  achieved supports the Company's view
that  it can obtain the higher rates  of recovery required to reach the existing
2010 production  target. The Company will  continue monitoring and reporting the
progress  in  the  bioheapleaching  process  and  the  development of production
volumes against the given guidance.


Enquiries:

Talvivaara Mining Company Plc tel. +358 20 712 9800

Pekka Perä, CEO

Saila Miettinen-Lähde, CFO


About Talvivaara Mining Company plc

Talvivaara  Mining Company  aims to  become 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 sufficient  to support anticipated production  for at least 46
years.  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 signed a long-term
zinc  streaming agreement  with Nyrstar  NV. Talvivaara  is listed on the London
Stock  Exchange Main Market and NASDAQ OMX  Helsinki and is included in the FTSE
250 Index. Further information can be found at www.talvivaara.com.



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