Interpretation and Modelling of VTEM Data in Difficult Circumstances, Bon Accord Nickel-Sulphide Deposit

The Bon Accord nickel-sulphide deposit, near Barberton, is surrounded by cultural noise in the form of an operating talc mine, a railway line, a metal pipeline and high voltage power lines which combine to render ground TDEM follow-up and modelling ineffective. A heliborne VTEM survey was therefore flown over the deposit in order to try and delineate the orebody and generate additional targets for follow-up. Although compromised by noise, the VTEM data could be modelled directly using EMIT’s Maxwell software. The modelling matches drilling results closely and has engendered confidence in the new VTEM targets awaiting drilling.