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Location: 28 km W from Kiuruvesi, Finland
Mainarintie 2, 86900, PyhakumpuPyhasalmiFinland86801
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The Pyhäsalmi deposit is a copper-zinc volcanogenic massive sulphide deposit of Proterozoic age. The mineralization is hosted by altered felsic and mafic volcanic rocks. The enveloping alteration zone is at least four kilometres long and one kilometre wide at its widest point. Alteration of the felsic volcanic rocks includes sericite and cordierite dominated mineralogy. Cordierite, anthophyllite and garnet dominate in the altered mafic volcanic rocks. The metamorphic grade is upper amphibolite facies.The upper part of the Pyhäsalmi deposit was mined between 1962 and 2001 and is now depleted. Deep drilling in 1996 by Outokumpu Oy (the previous owner) led to the discovery of an extension to the deposit below the +1050 meter level. The newer deep deposit is located between the +1050 meter level (from surface) and the +1416 meter level. The inner part of the lens consists of massive pyrite with low copper and zinc values. This core is surrounded by massive chalcopyrite-pyrite and the outer rim consists of massive sphalerite-pyrite. The main sulphide minerals are pyrite (65%), chalcopyrite (3%), sphalerite (4%) and pyrrhotite (3%).
