“…Romberger, oral commun., 1981). Romberger (1982) summarized the conditions favoring gold deposition as follows: "* * * If gold were transported as chloride complexes, deposition occurs with increased pH, reduction, dilution and/or cooling," and "* * * if gold were transported as bisulfide complexes, oxidation, dilution, pH changes, and/or precipitation of base metal sulfides result in gold deposition." Gold deposition is particularly likely to occur where ascending solutions boil as a result of decreasing hydrostatic pressure, because there is a simultaneous loss of dissolved sulfide, decrease in temperature, and change in pH as volatile constituents, such as H2S and CO2, partition into the evolving gas (mostly steam) phase.…”