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The rate of change in the solubility of gold and, in one case, silver has been measured as a function of changes in fo2, fH2, pH, and pressure. The experiments were carried out in a quartz-lined, stirred autoclave containing an aqueous H2S-HS solution. Acidification of the solution causes a rapid decrease in gold solubility, an increase in fo2 and depressurization cause a slower decrease, and an increase in fH2 gives the slowest decrease in gold solubility. Increases in fo2 as well as depressurization give initial increases...

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