The Keivitsa Ni-Cu-PGE sulfide deposit occurs in a mafic-ultramafic layered body that intruded 2.05 Ga ago in central Finnish Lapland. It consist of a low-grade dissemination of Ni-Cu sulfides hosted by partially altered olivine clinopyroxenites and olivine websterites. The deposit also contain zones rich in noble metals (cut-off 1 ppm PGE+Au) where the average total PGE is 2.189. PGE+Au rich zones display a pipe-like shape and are located in zones of increased Ni and Cl. The mineralogy of PGE is made up of Pt minerals (braggite, sperrylite and moncheite) with minor Pd phases (Pd bismuthotellurides), which mainly occur included in hydrous silicates and, to a lesser extent, attached to the grain boundaries of sulfides. PGE+Au pipes constitute the core of an asymmetrical, diffuse, zoned structure in which sulfur occupy the largest area, then comes Cu and then Ni and PGE. This spatial distribution results from the hydrothermal re-mobilization of a primary, magmatic Ni-Cu deposit.
