ABSTRACT
Sulphosalt-rich vein-type ores, which represent an important mineralisation type of the Boliden Au-Cu-As massive sulphide deposit, have been investigated. The ore textures are characterised by extensive deformation and the presence of complex late-stage decomposition assemblages. Most of the sulphosalt phases (kobellite, bournonite) are Se-rich and are closely associated with selenide minerals (laitakarite, galena-clausthalite ss.). Laitakarite displays substantial Te substitution in the range of 0.94-9.64 wt.%, not reported from other occurrences before. Pb concentrations in the laitakarites are almost constant and vary between 3.01 and 4.56 wt.%.
