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The solubility of gold has been calculated in the high-temperature (290°C) hydrothermal fluids of the Ohaaki-Broadlands geothermal system. If the dihydrosulfidogold(I) complex (Au(HS)1) is assumed to account for the gold in solution, the calculated solubility is 11.1 μg kg−1 which is in reasonable agreement with the measured value of 1.5 μg kg−1. The concentration of gold in solution as AuCl2−1 is very small (1.2 x 10−7 μg kg−1) and this species is unimportant in the transport of gold in these ore-forming fluids.

If gold is present in...

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