Abstract
A study has been made of the interaction of a New Zealand greywacke and hot water at temperatures up to 500°C. Comparisons are drawn between the trace element content of the reaction solutions and the composition of New Zealand thermal waters with particular reference to the Broad-lands geothermal field. The experiments have demonstrated that hot water can extract significant quantities of As, Sb, Se and S at temperatures below the maximum temperatures recorded for the major geothermal fields in New Zealand. The amount of Tl and Co leached up to 500°C was below the limits of detection and data could not be obtained for Au, Ag, Te and Bi.
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