Israeli billionaire Dan Gertler, left, takes a tour of the Katanga Mining Ltd. copper and cobalt mine complex with Shimon Cohen, right, his communications advisor, right, in Kolwezi, Democratic Republic of Congo, on Wednesday, Aug. 1, 2012. Since he first arrived in wartime Congo in 1997 at only 23 years old, Gertler has amassed an empire worth almost $2.5 billion dollars, according to Bloomberg calculations using publicly available documents. Photographer: Simon Dawson/Bloomberg via Getty Images
