The Taivaljarvi Ag-Zn deposit in the Archaean greenstone belt, eastern Finland.

The Taivaljarvi Ag-Zn deposit is stratiform and consists of four ore layers. The deposit contains 3 450 000 tonnes of ore with 1.27% Zn, 0.57% Pb, 160 g/t Ag and 0.37 g/t Au. The content of sulphide minerals is low, only 5% on average. The main ore minerals are sphalerite, galena, chalcopyrite, pyrite and pyrrhotite, dyscrasite, freibergite, electrum and native Ag. The deposit displays disseminated and vein-type ore textures. The volcanic host rocks are deformed and metamorphosed in high amphibolite facies, and the metamorphic mineral assemblages reflect the variation in chemical compositions of the rock sequence. The intensive hydrothermal alteration associated with mineralisation predated the regional metamorphism, but it can still be recognised in the chemical composition of the rock sequence. The sulphur isotope values indicate a volcanic origin for the sulphur. The ore deposit is a product of hydrothermal activity associated with volcanoclastic felsic eruption, and the type of deposition is assumed to be epithermal in character.
The Taivaljarvi Ag-Zn deposit is stratiform and consists of four ore layers. The deposit contains 3 450 000 tonnes of ore with 1.27% Zn, 0.57% Pb, 160 g/t Ag and 0.37 g/t Au. The content of sulphide minerals is low, only 5% on average. The main ore minerals are sphalerite, galena, chalcopyrite, pyrite and pyrrhotite, dyscrasite, freibergite, electrum and native Ag. The deposit displays disseminated and vein-type ore textures. The volcanic host rocks are deformed and metamorphosed in high amphibolite facies, and the metamorphic mineral assemblages reflect the variation in chemical compositions of the rock sequence. The intensive hydrothermal alteration associated with mineralisation predated the regional metamorphism, but it can still be recognised in the chemical composition of the rock sequence. The sulphur isotope values indicate a volcanic origin for the sulphur. The ore deposit is a product of hydrothermal activity associated with volcanoclastic felsic eruption, and the type of deposition is assumed to be epithermal in character.