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Geological – Geophysical 3D Modelling of the Mullikkoräme VMS deposit, Finland
2010 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The Mullikkoräme deposit, owned by Pyhäsalmi Mine Oy, is a satellite deposit located north east of the Pyhäsalmi mine in the eastern part of the Pyhäsalmi Volcanic Complex (PVC) in Central Finland. It is a VMS type deposit composed of five small vertical lenses of ore hosted by altered felsic and mafic volcanic rocks. Between 1990 and 1993, the Mullikkoräme deposit was mined out by Outokumpu Oy: since then, Pyhäsalmi Mine Oy kept exploring this area and many geophysical surveys were carried out, making available a large amount of information (geological, geophysical and geochemical information). This thesis aims at producing an integrated 3D geological model in order to identify new interesting prospective areas around the Mullikkoräme deposit. All the available geophysical, geological, geochemical data has been integrated into a unique comprehensive 3D gOcad© prospective geomodel. A draft 3D skeleton model is preliminary built from interpretative cross sections and surface geological maps. It is then improved and constrained using well data. After characterizing the main units geophysical response, 3D geological contacts, faults and geobodies are extended to deepest levels and interpolated using the available interpreted geophysical data (magnetic and gravity maps, conductivity, chargeability and seismic profiles, 3D gravity and conductivity block model). This model is then used to visualize the 3D structures, the lithologies and the geophysical anomalies in an integrated way in order to identify any new potential interesting targets. One of the main results of this project is a complete 3D geomodel of the area, integrating both geological information and geophysical information. It is used by the company to visualize all the data available in the area using a unique shared Earth model. A few really interesting targets have already been identified based on this 3D model, and drilling is being planned for November 2010.

Place, publisher, year, edition, pages
Keyword [en]
Life Earth Science, Mineral Exploration, 3D Modeling, gOcad, VMS deposit, deep, environment
Keyword [sv]
Bio- och geovetenskaper
URN: urn:nbn:se:ltu:diva-51671ISRN: LTU-DUPP--10/109--SELocal ID: 8df03f69-d825-4197-a0d1-80b0f5aa3fd8OAI: diva2:1025035
Subject / course
Student thesis, at least 30 credits
Educational program
Geosciences, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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