Crustal Imaging and Characterization Team
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The USGS Mineral Resources Program seeks to increase knowledge about ore-deposit genesis, use this knowledge to improve methodologies for mineral-resource assessment, and apply these methodologies at different spatial scales from local and national to global. The principal goal of this project was to enhance the ability of USGS scientists to forecast the likelihood of as-yet undiscovered world-class mineral deposits at different spatial scales, with particular emphasis on epizonal base- and precious-metal hydrothermal deposit types typically found in subduction-boundary zones. Of highest priority were porphyry Cu, polymetallic veins and replacements, and epithermal Au-Ag-base metal systems. To work towards the principal goal, the project focused on the following interrelated objectives:
The USGS is currently conducting a global assessment of undiscovered mineral resources including copper and gold. At least 71% of the known Cu resource occurs in association with igneous rocks. World-class deposits of Cu account for 84% of the total known Cu resource (Singer, 1995). Thus, a greater understanding about how porphyry Cu deposits are localized and form will significantly improve mineral-resource assessments and assist minerals exploration. Approximately 54% of all non-placer Au is clearly related to igneous rocks (Singer, 1995). If deposits spatially associated but of uncertain genetic relation to igneous rocks (e.g., Mother Lode, Carlin) are included, then 99% of all non-placer Au is related to igneous rocks. Significant Au resources occur in epithermal and porphyry Cu type deposits. Therefore, knowing how and why world-class epizonal ore deposits in subduction-boundary zones form will contribute greatly to the development of assessment methodologies that improve quantitative forecasts of undiscovered world-class deposits. Potential benefits to the USGS Mineral Resources Program include providing knowledge that;
Byron Berger | Box 25046 MS 964 Denver, CO 80225 |
(303) 236-5533 bberger |
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