Bisbee (bĭzˈbē) [key], city (1990 pop. 6,288), seat of Cochise co., SE Ariz., near the Mexican border; inc. 1900. It was formerly a great copper-producing center, but mining has declined significantly. After the rich copper deposits were discovered (c.1876), the city was built in two steep-sided canyons, Mule Pass Gulch and Brewery Gulch. Nearby is Coronado National Memorial (see National Parks and Monuments, table), which commemorates the visit (1540) of Francisco Coronado.