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'''Viper Mine''' is an underground coal mine in Williamsville, Illinois, owned by [[International Coal Group]]. The mine is a room-and-pillar operation, utilizing continuous miners and battery haulers. The coal is transported to utility and industrial customers located in North Central Illinois, with shipments to electric utilities accounting for approximately about 58% of coal sales. Approximately 61% of the coal reserves are leased.<ref>[http://www.intlcoal.com/ "Coal Operations: Viper Mine"] International Coal Group Website, November 2009</ref>