Black Mesa Coal Mine and Pipeline, Arizona

A former coal mine, where the coal was extracted, pulverized, and mixed with water to form a slurry, which was then transported through a pipeline for 273 miles to the Mojave Generating Station, a power plant in Laughlin, Nevada. At the time, the 18-inch diameter pipe was the longest coal-slurry pipeline operating in the U.S. The mine closed in 2005, following the closure of the Mojave Generating Station (the sole customer for the mine's coal), whose owners refused to pay for court-mandated emission controls resulting from a lawsuit brought by various environmental groups, due to long-standing violations of the Clean Air Act. In addition, protests led by local Navajo and Hopi activists in conjunction with assorted national environmental organizations over the pumping of 1.3 billion gallons of water a year from the Navajo Aquifer (the main source of drinking water for residents of Black Mesa), resulted in a decision by the Navajo and Hopi Tribal Councils to ban the use of groundwater from the Navajo Aquifer in the transportation of coal.The mine was operated by Peabody Western Coal Company, a subsidiary of Peabody Energy.