The Calibration of CSAMT Data in a Strong Magnetic Background

CSAMT has become an important tool for De Beers in areas with sedimentary cover for the delineation of<br>kimberlites and surrounding country-rock geology. This method provides high-resolution conductivity sections<br>from which geologic horizons can be interpreted and combined with other datasets to generate 3-D geologic<br>models. However, confirmation drilling in some environments has demonstrated a constant depth exaggeration. An<br>average exaggeration of 30% was observed.