Samples collected in 1985 were analyzed by the following methods and digestions: for gold using Atomic Absorption Spectroscopy after fire assay; for silver, copper, lead, zinc and cobalt using Atomic Absorption Spectroscopy after HNO3-HCl hot extraction by an unknown commerical laboratory in Denver, CO. The publication states that 146 samples were analyzed for barium using X-ray Diffraction by the USBM Reno Research Center. We believe the samples were analyzed by X-ray Fluorescence.