With a general knowledge about the geological setting it is possible to use numerical modelling of geoelectrical and IP data to obtain useful experience for the interpretation of real measurements. In this case the vertical extension of a dolerite dyke has been modelled and compared with real data. It is obvious from the resistivity modelling that it in this particular case not is possible to say anything about the vertical extension of the low resistive zone in the real measurements. Based on the experience from the IP modelling it is much clearer that the dyke extends to the bottom of the model. By combining different methods which exploits different physical properties a better and more reliable interpretation can clearly be done.


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