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Surface and Borehole Magnetotelluric Measurements to Delineate an Ore Deposit in Northern Sweden
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 2nd Conference on Geophysics for Mineral Exploration and Mining, Sep 2018, Volume 2018, p.1 - 5
Abstract
In recent synthetic studies, combinations of magnetotelluric (MT) surface and borehole measurements have been demonstrated to reduce the ambiguity in models of electrical resistivity as compared to models computed from surface data. We took advantage of this and recorded combinations of MT surface impedances and axial voltages (i.e. integrals of electric fields along boreholes) at a mineral deposit in northern Sweden. In this contribution, we introduce an axial voltage transfer function in frequency domain, present a preliminary 2D inversion model of the surface MT data and discuss the compatibility of the axial voltage transfer function derived from our borehole field data with the preliminary 2D inversion model. In the next step, we will include the axial voltage transfer functions in the inversion of the field data.