Jan Francke has co-authored a paper entitled “Application of advanced ground penetrating radar technology for abandoned working detection at Geita Gold Mine, Tanzania”. The paper, to be presented at an AngloGold Ashanti conference in September, 2009 discusses the use of UltraGPR to image abandoned workings at an open pit operation in Tanzania. UltraGPR was able to detect a series of voids at a coverage rate of one hectare per day with one metre-spaced profiles.