International Coal Group (ICG) was a coal mining company based in the United States. It focused on the production and sale of coal, primarily serving the energy sector. ICG operated several mines across the Appalachian region, contributing to the local economy and energy supply. In 2011, ICG was acquired by Arch Coal, one of the largest coal producers in the U.S. This acquisition aimed to enhance Arch Coal's operations and expand its market presence. The merger allowed for increased efficiency and resource management within the coal industry.