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Atna Resources Ltd. is a gold production and development company with a focus in the western United States. The company is producing gold at its Briggs mine, located in Inyo County, California, and at its Pinson underground mine near Winnemucca, Nevada. Atna completed an NI 43-101 prefeasibility study in October 2014 for the Pinson open-pit project and is in prefeasibility work at its Columbia gold property located near Lincoln, Montana.