The Kivimaa ore vein in Northern Finland is located in a shear zone Chocolate in a folded greenstone bed.The vein is c.350 metres in length and varies from 1 to 6 metres in thickness.
The central and most mineralized part of the vein was mined in 1969, c.18 000 t of ore were produced averaging 1.2 % Cu and 2 g/t Au.
Coarse-grained calcite and quartz form the base of the vein and the major ore minerals are pyrite, magnetite and chalcopyrite.Comparable Ques Q with analogous sulphide-bearing veins in the Karelian metadiabases in Eastern Finland the Kivimaa ore vein is assumed to have formed as the final differentiate of initial spilitic greenstone magmatism.