In 1956 he reached the summit of Monte Sarmiento in Tierra del Fuego and in 1958, as a member of Riccardo Cassin’s expedition in Karakorum, he and Walter Bonatti made the first ascent of Gasherbrum IV (7,925 m).
Following the Ra expeditions, Mauri took part in many others including following the route of Marco Polo in the Asian steppes and exploring Patagonia and the Amazon.
He also made several documentary films of his travels, some of them produced for the Italian state broadcaster RAI.
He was a member of the “Gruppo Ragni Grignetta di Lecco” climbers group.
After an accident where he suffered a broken leg, Mauri became the first Italian to undergo Gavril Ilizarov's bone-lengthening operation, distraction osteogenesis.