ead, molybdenum, petroleum and natural gas, silver, and zinc. Important mining centers include Leadville and Climax, Colorado; Atlantic City, Wyoming; Kellogg, Idaho; Butte, Montana; and Fernie and Kimberley, British Columbia. Major forest products industries, especially lumbering, are concentrated in the Northern and Canadian Rockies, and large numbers of sheep and cattle are raised in the Rockies of Colorado, Wyoming, and Montana. The chain has many centers for outdoor recreation and tourism.
             Bighorn Mountains, isolated range of the Rocky Mountains, lying east of the Bighorn River and extending generally north from central Wyoming into southern Montana. The range averages more than 2134 m (7000 ft) in elevation; the highest summit is Cloud Peak (4019 m/13,187 ft) in Wyoming. Along the upper levels are large coniferous forests, which are part of Bighorn National Forest.
             Bitterroot Range, mountain range, northwestern United States, a chain of the Rocky Mountains, extending about 700 km (about 435 mi) along the Montana-Idaho border. Rugged and
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