In this undated photo, Mary Kopco, executive director of Deadwood History, Inc., is assisted as she points out details of the Potato Creek Johnny gold nugget at the Adams Museum in Deadwood, S.D. The museum in May 2014 is planning to permanently display the nugget, one of the largest gold nuggets ever found in western South Dakota's Black Hills. John Perrett found the nugget on his claim on Potato Creek on May 27, 1929. It weighs nearly 7.4 troy ounces. (AP Photo/Black Hills Pioneer, Jaci Conrad Pearson)
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