Desperate miners hack it from mud holes. Paid only a pittance, they risk bandits, landslides and death. Their efforts fuel the conflicts which have ravaged a continent. Yet the West can't live without coltan, Africa's new black gold
Jun 12, 2005; IT'S a long way from Gleneagles to Goma. About 5000 miles as a mobile phone signal flies. Five thousand miles from a land of...