We present the first results of a semi-airborne survey conducted in 2018 at Per Geijer iron ore in northern Sweden (Kiruna). In our semi-airborne system, the transmitter is positioned on the ground and magnetic field receivers are airborne. To support airborne measurements, we complemented the survey with an array of ground electric field receivers, magnetotelluric (MT) stations, and SMARTem measurements. The objective of the study is to combine different types of electromagnetic (EM) data in order to derive a common 3D conductivity model of the exploration area. We process data in frequency domain using a robust processing scheme. The airborne data are additionally corrected for rotation. The final 3D model is derived using combined ground and airborne data from three source positions (Controlled-Source EM inversion). Additionally, a 3D model from MT data is obtained separately and used as a starting model for CSEM inversion. Both models match the well-known surface geology and other geophysical information yet bring new insights into the general model of the camp. The next step is a joint inversion of the MT and semi-airborne CSEM data.


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  1. Cherevatova, M., Nittinger, C., Becken, M., Guenther, T. and DesmexWg
    [2017] 3D inversion of the semi-airborne electromagnetic data from Schleiz, Germany. Near Surface Geoscience Conference and Exhibition, EAGE, Malmö, Sweden (extended abstract).
    [Google Scholar]
  2. Cherevatova, M., Becken, M., Steuer, A., and DesmexWg
    [2018] A new semi-airborne system for mineral exploration. Results of the first flight experiments. 7th International Workshop on Airborne electromagnetics (extended abstract).
    [Google Scholar]
  3. Egbert, G.D. and Kelbert, A.
    [2012] Computational recipes for electromagnetic inverse problems. Geophysical Journal International, 189(1), 251–267.
    [Google Scholar]
  4. Elliott, P.
    [1996] New airborne electromagnetic method provides fast deep-target data turnaround. The Leading Edge, 15(4) 309–310.
    [Google Scholar]
  5. Grayver, A. V., Streich, R., and Ritter, O.
    [2013] Three-dimensional parallel distributed inversion of CSEM data using a direct forward solver. Geophysical Journal International, 193(3), 1432–1446.
    [Google Scholar]
  6. Mogi, T., Tanaka, Y., Kusunoki, K., Morikawa, T., and Jomori, N.
    [1998] Development of grounded electrical source airborne transient EM (GREATEM). Exploration Geophysics, 29(1/2), 61–64
    [Google Scholar]
  7. Mörbe, W., Yogeshwar, P., and Tezkan, B.
    [2018] Investigation of deep mineral deposits in Germany: Multidimensional inversion of long offset CSEM data in time and frequency domain. Proceedings of the 24th Electromagnetic Induction Workshop, Helsingor, Denmark.
    [Google Scholar]
  8. Nittinger, C., Cherevatova, M., Becken, M., Martin, T., Petersen, H., Steuer, A., Meyer, U., Siemon, B., Matzander, U., Friedrichs, B., Mörbe, W., Yogeshwar, P., Tezkan, B., Rochlitz, T., and Günther, T.
    [2017] A Novel Semi-airborne EM System for Mineral Exploration - First Results from Combined Fluxgate and Induction Coil Data. Near Surface Geoscience Conference and Exhibition, EAGE, Malmö, Sweden (extended abstract).
    [Google Scholar]
  9. Schiffler, M., Chwala, A., Kukowski, N., Meyer, H. G., Meyer, M., Meyer, U., and Stolz, R.
    [2017] Development of new magnetic field sensors for electromagnetic mineral exploration in the DESMEX project. Fruehjahrstagung der Deutschen Geophysikalischen Gesellschaft.
    [Google Scholar]
  10. Seigel, H. O.
    [1971] A recent development in Semi-Airborne Electromagnetic Prospecting. ASEG Bulletin, 2(3) 25–45.
    [Google Scholar]
  11. Smirnov, M. Y.
    [2003] Magnetotelluric data processing with a robust statistical procedure having a high breakdown point. Geophysical Journal International, 152(1), 1–7.
    [Google Scholar]
  12. Steuer, A., Preugschat, B., Cherevatova, M., Mörbe, W., Yogeshwar, P., Günther, T, Rochlitz, R., Schiffler, M., Costabel, S., Müller, F., and the DESMEXWG
    [2019] Validation of semi-airborne 3D inversion results using airborne and ground-based EM methods, as well as geological models and borehole measurements. EGU General Assembly (abstract).
    [Google Scholar]
  13. Streich, R.
    [2016] Controlled-Source Electromagnetic Approaches for Hydrocarbon Exploration and Monitoring on Land. Surveys in Geophysics, 37(1), 47–80.
    [Google Scholar]
  14. Yang, D., and Oldenburg, D. W.
    [2016] 3D inversion of total magnetic intensity data for time-domain EM at the Lalor massive sulphide deposit. Exploration Geophysics, 48(2), 110–123.
    [Google Scholar]

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