Digital Image 13-1
Goldfield training site, Nevada. Zones are after R. P. Ashley. 1974. Goldfield mining district. In Guidebook to the Geology of Four Tertiary Volcanic Centers in Central Nevada (Report 19, pp. 49–66). Nevada Bureau of Mines and Geology and R. D. Harvey and C. J. Vitaliano. 1964. Wall-rock alteration in the Goldfield District, Nevada. Journal of Geology, 72, 564–579.
Left: diagram showing alteration zones associated with highly altered silica veins that may contain gold.
Center: Names of zones and subzones.
Right: Samples of zones and subzones. Except for the silicic zone, the samples are fresh and lack the brown and tan hues of iron oxides caused by weathering of pyrite.