Oruro was reestablished in the late nineteenth century, as a tin mining center. For a time, the La Salvadora tin mine was the most important source of tin in the world. Gradually, this resource was also exhausted, and Oruro again went into a decline. The city does manage, however, to attract tourists to its carnival, the Carnaval de Oruro, considered one of the great folkloric events in South America for its masked "devil dances". Oruro was named after the native tribe "Uru-Uru". The city is the seat of the Roman Catholic Diocese of Oruro. The Oruro Symphony Orchestra is based in Oruro.