Preprints
https://doi.org/10.5194/se-2021-101
https://doi.org/10.5194/se-2021-101

  17 Aug 2021

17 Aug 2021

Review status: this preprint is currently under review for the journal SE.

3D reflection seismic imaging of the iron-oxide deposits in the Ludvika mining area (Sweden) using a focusing pre-stack depth migration approach

Felix Hloušek1, Michal Malinowski2,3, Lena Bräunig1, Stefan Buske1, Alireza Malehmir4, Magdalena Markovic4, Lukasz Sito5, Paul Marsden6, and Emma Bäckström6 Felix Hloušek et al.
  • 1TU Bergakademie Freiberg, Freiberg, Germany
  • 2Institute of Geophysics, Polish Academy of Sciences, Warsaw, Poland
  • 3Geological Survey of Finland, Espoo, Finland
  • 4Department of Earth Sciences, Uppsala University, Uppsala, Sweden
  • 5Geopartner, Poland
  • 6Nordic Iron Ore AB, Ludvika, Sweden

Abstract. We present the pre-stack depth imaging results for a case study of 3D reflection seismic exploration at the Blötberget iron-oxide mining site belonging to the Bergslagen mineral district in central Sweden. The goal of this case study is to directly image the ore-bearing units and to map its possible extension down to greater depths than known from existing boreholes. Therefore, we applied a tailored pre-processing workflow as well as two different seismic imaging approaches, Kirchhoff pre-stack depth migration and Fresnel Volume Migration (FVM). Both imaging techniques deliver a well resolved 3D image of the deposit and its host rock, where the FVM image yields a significantly better image quality compared to the KPSDM image. We were able to unravel distinct reflection horizons, which are linked to known mineralisation and provide insights on lateral and depth extent of the deposits beyond their known extension from borehole data. A comparison of the known mineralization and the image show a good agreement of the position and the shape of the imaged reflectors caused by the mineralization. Furthermore, the images show a reflector, which is interpreted to be a fault intersecting the mineralisation and which can be linked to the surface geology. The depth imaging results can serve as the basis for further investigations, drillings and follow-up mine planning at the Blötberget mining site.

Felix Hloušek et al.

Status: open (until 21 Oct 2021)

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Felix Hloušek et al.

Felix Hloušek et al.

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Short summary
Methods for mineral exploration play an important role within the EU. Exploration must be environmentally friendly, cost effective and feasible in populated areas. Seismic methods have the potential to deliver detailed images of mineral deposits but suffer from these demands. We show the results for such a sparse 3D seismic dataset, acquired in Sweden. The 3D depth image allows to follow the known mineralizations beyond the known extension and gives new insights into the geometry of the deposit.