50 samples were analyzed by the following methods and digestions: for gold and silver using Inductively Coupled Plasma after fire assay or by gravimetric methods after fire assay. Publication does not indicate which method was used on each sample. 50 of the samples were analyzed for copper and cobalt using Inductively Coupled Plasma; for lead and zinc using Atomic Absorption Spectroscopy. The publication states that 33 samples were analyzed for barium using X-ray in the data tables and by X-ray Diffraction in the description. We believe the samples were analyzed by standard X-ray Fluorescence methods.