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The Cordero Rojo Mine was formed in 1997 from the consolidation of two previously existing mines, the Cordero mine (purchased by Rio Tinto in 1993) and the Caballo Rojo mine (purchased in 1997).<ref name="MT"/> The mine produced between 34 and 36 million tons of coal per year in the years 2004 to 2006,<ref name="MT"/> and over 40 million tons of coal in 2007, making the Cordero Rojo that year's third-highest producer of coal in the United States.<ref name="EIA">{{cite web|url=http://www.eia.doe.gov/cneaf/coal/page/acr/table9.html|title=Major U.S. Coal Mines, 2007|date=September 2008|publisher=[[Energy Information Administration]] of the [[Department of Energy]]|accessdate=2009-04-14}}</ref>
In May 2012 it was announced that Cloud Peak Energy was going to face state and federal violations after blasters earlier in the month ignited an explosion that was more than three times its intended size.<ref>http://trib.com/news/mine-faces-state-federal-fines-for-massive-blast/article_50411ad9-3afb-5f77-a6c1-c53562cbed6e.html#ixzz1vdhblDkr "Mine faces state, federal fines for massive blast"] Jeremy Pelzer Star-Tribune, May 22, 2012.</ref>
{{#display_map:|44.11,-105.36|width=600|height=400|type=satellite|zoom=14}}
