Geological characteristics and genesis of the Kevitsa Ni-Cu-PGE deposit, northern Finland

Located in the Central Lapland greenstone belt of northern Finland, the Kevitsa Ni-Cu-PGE deposit is one of the major magmatic Ni-Cu sulfide deposits in the world. The deposit has abundant reserves and is rich in Ni-Cu sulfide and PGE. This paper summarizes the environment, geological characteristics, ore genesis and other aspects of the ore deposit. The orebodies are mainly hosted in ultramafic unit in the Kevitsa mafic-ultramafic layered intrusions; the main ore types are divided into two types, i.e., common type and Ni-PGE type; the olivines in Ni-PGE type have extremely high Ni content; the main ore minerals include pyrrhotite, pentlandite, chalcopyrite, pyrite, millerite, niccolite, chloanthite and gersdorffite, with most of the platinum group minerals contained in the silicate or attached to the boundary of sulfide particles; Re-Os, Sm-Nd, Sr and S isotopic characteristics indicate that mineralized magma was derived from the mantle, but the magma was contaminated by crustal substances; geochronologic analysis indicates that Kevitsa intrusion was formed in the Paleoproterozoic.