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→Major coal mines: section added
|align="center" | Hardin, MT || align="center" | [[Westmoreland Coal]] || align="right" | 6,807,000 tons
|}
In 2006, these four mines produced 98.3% of Montana's coal.<ref>[http://www.eia.doe.gov/cneaf/coal/page/acr/table9.html Major U.S. Coal Mines], Energy Information Administration, accessed June 2008.</ref>As of 2010 there were approximately 2 active coal mines in Montana with production of approximately 28,949 short tons per year.<ref>[http://www.eia.gov/coal/annual/pdf/table2.pdf "Coal Production and Number of Mines by State, County, and Mine Type, 2010"] U.S. Energy Information Administration (EIA), 2010.</ref>
===September 2009: [[Signal Peak Mine]] Reopens===
