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city, seat of Tooele county, north-central Utah, U.S. It lies 32 miles (52 km) southwest of Salt Lake City. Settled in 1849, it was a centre for mining operations in the 1860s and '70s after rich silver and gold veins were discovered in the nearby Oquirrh Mountains. Its name may refer to Tuilla, a local Indian leader, or to the abundant tules, or bulrushes, that grew near the local springs. The city is a rail and trading centre with smelting and mining (silver, lead, and copper), agriculture (grains and sugar beets), and defense installations (Tooele Army Depot and the Dugway Proving Ground) as the economic mainstays. The Tooele Army Depot contains one of the nation's principal stockpiles of conventional and chemical munitions, including nerve agents and other toxins. A tunnel (constructed 1937-42) extends 4 miles (6 km) east from Tooele through the Oquirrh Mountains to mines in Bingham Canyon. Several ghost towns, notably Mercur, and one of the world's largest open-cut copper mines are nearby. Inc. 1853. Pop. (1990 est.) 13,887; (2000) 22,502.