The concentrations of trace metals in deep hydrothermal solutions (~1 km depth, 200 to >300C) from modern hydrothermal systems in the Taupo Volcanic Zone, New Zealand, and Ladolam, Lihir Island, Papua New Guinea were obtained using a purpose-built downhole fluid sampler and ICP-MS analyses. The results range widely: gold (<0.1 - 23 ppb); silver (><3 - 2400 ppb); arsenic (100 - 18 000 ppm); antimony (2 - 1200 ppm); mercury (><1 - 78 ppb) and provide the basis for quantifying the flux and fate of metals as well as assessing their sources (simmons and brown, 2006, 2007)._x000d_>
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