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Hallador was founded as The Kimbark Company, Ltd. in July 1951 by a small group of geologists and business professionals.
In 1981, its various business entities were consolidated as Kimbark Oil & Gas Company, a Colorado corporation.
With new management steering the company forward and determined to succeed, Hallador purchased the South Cuyama Oil and Gas Field in Santa Barbara County, California, in 1990.
In July 2006, Hallador entered into a joint venture with Sunrise Coal, LLC, an Indiana coal mining company, acquiring a 60% stake in Sunrise for $20.5 million.
In 2014, Hallador purchased Vectren Fuels, tripling the size of the company.
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