Before about 1950, there were lingering doubts that geothermal systems (Fig. 5.1), both ancient and modern, were responsible for hydrothermal ore genesis. That uncertainty stimulated searches for evidence that could test for correlations between ore deposits and geothermal sites. The most accessible links would be with hydrothermal ores formed at the temperatures found commonly in many active, continental geothermal fields. Those earliest recognised were mercury-containing hot springs, such as the classic examples in the California Coast Ranges (White, 1981). Comparisons of the very similar characteristics of those hot springs and other mercury deposits are found in...

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