Talvivaaran Kaivososakeyhtiö Oyj - Company Announcement

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 week.

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.

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#1690996]

Attachments:

Leakage detected at Talvivaara mine's gypsum pond 8.4.2013.pdf