Official contacts

Tel. +358 29 503 0000
The charge for calling our numbers beginning with 29 is your local network charge or the basic mobile phone charge of your mobile operator subscription.

Management and contact persons

E-mail 
- Official registry address: gtk_gtk.fi
- Personal mail: forename.surname_gtk.fi

Business ID: 0244680-7

GTK's headquarters are based in Espoo, Finland.

Offices  
Espoo
P.O. Box 96
(Betonimiehenkuja 4)
FI-02151 Espoo
Finland
Map
National Drill Core Archives
Mustinsuontie 159
FI-12600 Läyliäinen
Finland
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Kuopio
P.O. Box 1237
(Neulaniementie 5)
FI-70211 Kuopio
Finland
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GTK Mintec
Tutkijankatu 1
FI-83500 Outokumpu
Finland
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Rovaniemi
P.O. Box 77
(Lähteentie 2)
FI-96101 Rovaniemi
Finland
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Kokkola
P.O. Box 97
(Vaasantie 6)
FI 67101 Kokkola
Finland
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GTK invoice address

Electronic invoices
E-billing address/party identification number: 003702446807
Operator ID (OpusCapita Group Oy): 003710948874

Business ID: 0244680-7
VAT number: FI02446807

Only electronic invoices accepted
If you do not yet have an e-billing system, you can use the Finnish Government’s e-billing service Supplier Portal to produce and send electronic invoices. The service is currently offered free of charge. To find out more about the service and to create an account, please visit Government E-Invoicing Website.