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Oruro or Uru Uru is a city in Bolivia with a population of 264,683, about halfway between La Paz and Sucre in the Altiplano, approximately 3,709 meters (12,169 ft) above sea level. It is Bolivia's fifth-largest city by population, after Santa Cruz de la Sierra, El Alto, La Paz, and Cochabamba. It is the capital of the Department of Oruro and the seat of the Roman Catholic Diocese of Oruro. Oruro has been subject to cycles of boom and bust owing to its dependence on the mining industry, notably tin, tungsten (wolfram), silver and copper.