A time domain electromagnetic and a magnetic surveys were conducted by a VTEM system in 2005 over Drybones kimberlite (Canada). The EM data, showing IP effect, were inverted using the modified AarhusINV code with Cole-Cole modeling while for the magnetic data we used a new inversion algorithm considering vertical profiles (soundings) of data at different altitudes.

The comparison of the inverse models, i.e. susceptibility, resistivity and chargeability, was performed along a profile for which a geological cross-section has been drawn basing on drilling information. The results revealed the different sensitivity of methods with respect to the geological structures at Drybones bay. However we show how the cooperation of the TDEM and aeromagnetic data in the studied area can lead to a better understand of the structures at depth.


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