Abstract
Ninety-two samples of AuAg-bearing quartz veins and associated volcanic rocks from the Como mining district, Nevada, have been analyzed for Au, Ag, Tl, Rb, K, Ba and Sr, and data on K/Tl, K/Rb, Ba/Tl, Tl/Sr and Rb/Sr ratios are presented. The Au and Ag concentrations along with the Tl/Sr and Rb/Sr ratios increase in order from unaltered andesite to altered andesite and AuAg-bearing quartz veins while the K/Tl, K/Rb and Ba/Tl ratios decrease. The relationship between Tl, Rb and K indicates that Tl in the mineralized rocks is more enriched than Rb which, in turn, is more enriched than K. The data obtained in this study suggest that the content of Tl and the Ba/Tl and K/Tl ratios are useful exploration tools in delineating precious metal vein deposits, which are associated with volcanic rocks and which show a wide variation in concentrations of Au and Ag due to their natural inhomogeneous distribution.
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