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|Major gaps in understanding hydro- thermal systems remain after a century of studying fossil ore deposits and active geothermal areas. The periodically rejuvenated concept of "stacking" ore deposit types has never been verified by a continuous sample. Basal and marginal regions of both “fossil" and "active" hydrothermal systems normally lie beyond the limits of economic exploration, remaining inadequately exposed. Incomplete scientific under- standing of he vertical transitions clearly limits the efficacy of exploration programs for hydrothermal ores of all types. The Continental Scientific Drilling Committee's (CSDC) Panel on Mineral Resources has defined dedicated research objectives and add-on experiments to industry or government drill holes of opportunity.|