Abstract
Mass balance calculations based on metal contents in hot spring mud deposits yield minimum metal contents in hot spring mud deposits yield minimum metal concentrations for the Rotokawa deep geothermal fluid which are compared with calculated (thermodynamic) mineral solubilities and direct analytical metal concentrations. The deep fluid is saturated with respect to native gold and argentite, but unsaturated with respect to cinnabar, native mercury, and stibnite. Adiabatic boiling leads to rapid partial precipitation of argentite from silver chloride complexes while silver and gold bisulfide complexes persist and become unstable only at shallower levels. Stibnite and cinnabar precipitation can only be expected at low temperatures and shallow levels. Mercury partitions into the vapor phase during boiling and a major fraction escapes to the atmosphere.
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