. More Nevada Bureau of Mines and Geology 0000-0-00 This small bar of gold was refined by the fire assay method. Detailed descriptions of present day methods of fire assaying can be found in Hafferty, J., L. B. Riley, and W. D. Goss, A Manual on fire assaying and Determiniation of the Noble Metals in Geological Materials, U.S. Geological Survey Bulletin 0000, Washington DC, 0000; and Bugbee, E. E., More 