Mäki, Timo and Imaña, Marcello and Kousa, Jukka and Luukas, Jouni (2015) The Vihanti-Pyhäsalmi VMS Belt. In: Mineral Deposits of Finland. Elsevier, pp. 507-530. ISBN 978-0-12-410438-9
Full text not available from this repository.Abstract
The Vihanti-Pyhäsalmi belt contains the most important volcanogenic massive sulfide (VMS) deposits in Finland. The volcano-sedimentary host rocks belong to a 1.93–1.92 Ga island arc that occurs along the northwestern parts of the Raahe-Ladoga shear complex. The stratigraphy in the region is divided into two units, a lower bimodal volcanic unit conforming to the Pyhäsalmi group and an upper volcano-sedimentary association defined as the Vihanti group. The U-Pb zircon ages of the two groups are similar. The Vihanti-Pyhäsalmi belt hosts two large VMS deposits, Pyhäsalmi in the Pyhäsalmi group and Vihanti in the Vihanti group, as well as a number of small sulfide deposits located around them. The Pyhäsalmi deposit is hosted by rhyolitic and basaltic volcanic rocks, contains 75.7 Mt of pyritic mineralization grading 0.9% Cu, 1.9% Zn, 0.4 g/t Au, and 14.1 g/t Ag, and hosts the only currently producing mine (2014) in the belt. The Vihanti mine operated from 1954–1992, producing 28 Mt at 5.12% Zn, 0.48% Cu, 0.36% Pb, 25 ppm Ag, and 0.49 ppm Au. The Vihanti deposit and three minor satellite mineralizations are hosted in a sequence dominated by intermediate and felsic metavolcanic rocks.
| Item Type: | Book Section |
|---|---|
| Subjects: | Methodology > Other-additional study Region > Finland > Pyhäjärvi Inducing technology > Underground mining |
| Project: | EPOS-IP > PYHASALMI MINE: in situ underground laboratory |