The largest coal-mining companies in the United States, as of 2013, were the Peabody Energy Corporation, Arch Coal, Alpha Natural Resources and Cloud Peak Energy. Together they produce approximately half the coal mined in the United States each year.
Peabody Energy owns and operates the North Antelope Rochelle mine located in the Powder River Basin of Wyoming. North Antelope Rochelle has the largest reserve of coal recoverable through mining in the world. Peabody also operates the Coballo mine in the same area. Coballo ranks eighth in coal reserves worldwide. The Black Thunder coal mine, operated by Arch Coal, is also in the Powder River Basin, and in 2012, was the fifth largest coal mine in the world. Black Thunder plans to maintain its 2012 coal production levels through 2021. North Antelope Rochelle, Coballo and Black Thunder are surface mines, which produce more coal with less manpower than underground mines.
Alpha Natural Resources owns and operates 60 coal mines and 22 coal preparation plants in the Powder River Basin and in Virginia, West Virginia, Pennsylvania and Kentucky. Cloud Peak Energy has its headquarters in the Powder River Basin. It is a pure-play Powder River Basin coal company, which means the majority of its business is coal mining or coal-related and occurs in the Powder River Basin.