Coballo (USA)

Reaching number eight on our list is the Coballo coal mine. Owned and operated by Peabody Energy, the surface mine is located 20 miles south-east of Gillette in Wyoming and first opened production in 1978.

Operating seven days per week with two 12-hour shifts daily, the Caballo mines extracts coal from two seams (Smith and Wyodak-Anderson). Coal production is transported by BNSF Railway and Union Pacific Railroad to customers throughout North America. During 2007, production for the site amounted to 31,172,396 tons, the sixth highest among coal mines in the United States.