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1 Two distinct chemical environments are recognized for epithermal mineralization in volcanic settings. In the first, typified by Goldfield, Nevada, mineralization is closely tied to magmatism; the ores are deposited in a chemical environment dominated by disproportionate of magmatic S0? and interaction of the resulting acid solutions with wallrock in steep thermal gradients near shallow plutons. In the second, typified by Creede, Colorado, mineralization is controlled by deeply circulating cells analogous to many modern geothermal systems; ores are deposited beneath an interface between deep, near neutral brines and overlying surface waters as a result of cooling and loss of acid volatiles.

Controls on base and precious metal mineralization in deeper epithermal environments