University of Oulu

Pyhäsalmi volcanogenic massive sulfide deposit, central Finland

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Author: Hettula, Jesse1
Organizations: 1University of Oulu, Oulu Mining School, Degree Programme in Geosciences
Format: ebook
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.7 MB)
Persistent link: http://urn.fi/URN:NBN:fi:oulu-201710253010
Language: English
Published: Oulu : J. Hettula, 2017
Publish Date: 2017-10-25
Physical Description: 29 p.
Thesis type: Bachelor's thesis
Description:

Abstract

Pyhäsalmi mine is located in central Finland, at the eastern side of the Pyhäjärvi lake. The Pyhäsalmi deposit is polymetallic Zn-Cu VMS ore body with total reserve, mined and yet to be mined, of 58.3 Mt @ Cu 0.9 %, Zn 2.4 %, S 37.8 %, Au 0.4 g/t and Ag 14 g/t. At the end of 2013, 51 Mt of ore has been mined. The mine will be in operation until August of 2019.

The Pyhäsalmi deposit is hosted in a felsic-dominated bimodal Proterozoic succession. Local hydrothermal alteration is composed of sericite-quartz alteration, and intensifies when it is in close proximity with the upper ore body. The deep ore body is thrusted into unaltered metamorphosed hangingwall volcanic rock, thus separated from the alteration zone.

The Pyhäsalmi district and deposit has been subjected to four different tectonic phases (D1–D4) and intrusions accompanied by them. These tectonic processes have thrusted the deposit in upright position from the original position.

Basic theory of VMS formation processes can be used for modeling Pyhäsalmi deposit formation process, which in turn can benefit massive sulfide exploration.

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Copyright information: © Jesse Hettula, 2017. This publication is copyrighted. You may download, display and print it for your own personal use. Commercial use is prohibited.