Metropolises can today be seen as gigantic raw material mines, because during the last decades a lot of mineral wealth in cars, skyscrapers, mobile phones u.v.m. were installed. The phenomenon will be explained in more detail in the 3Sat documentary by Christoph Gretzmacher twovision’s film production. The 45-minute short documentary first appeared on 29.10.2012. The film was directed by Sandra Czeczelitz, who not only shed light on the latest developments and current state of research, but also conducted numerous interviews with experts from industry and science.