There are about a 100 million Anti-Personnel mines hidden in the ground. Their exact position is unknown, only the approximate areas are known. In Angola alone, more than 2000 people become amputated because of a mine incident every year [Wal95]. In order to stop damage to people and to make fertile land accessible again, all the mines have to be found and removed. Finding and removing them is a difficult problem. Unfortunately, mines became ``smart'' during the past years. Modern ones contain very little metal and are resistant to the usual ways of defusing (i.e. evenly applied pressure does not make them explode). The small metal content required more sensible detection sensors, which in turn also raised the false alarm rate. We must therefore find new methods for finding and demining the land in a cheap and effective way, affordable by third world countries.