The Rössing Uranium Mine in Namibia is the longest-running and one of the largest open pit uranium mines in the world and is located in the Namib Desert near the town of Arandis, which is 70 kilometres from the coastal town of Swakopmund. Namibia's only deepwater harbour, Walvis Bay, is 30 kilometres south of Swakopmund. Discovered in 1928, the Rössing mine started operations in 1976 and, in 2005, produced 3,711 tonnes of uranium oxide, becoming the fifth-largest uranium mine with 8 per cent of global output. Namibia is the world's fourth-largest exporter of uranium.