The U.S. Geological Survey (USGS) has been systematically monitoring global nonfuel mineral exploration activities to anticipate the location and quantity of future nonfuel minerals supply for about 100 commodities, with an emphasis on precious and base metals. Since 1995, the USGS has developed an annual list of 100 noteworthy prospects that were considered to have a high level of potential for near-term development based on such criteria as intensity of drilling, level of capital investment, and size of resource. This study reviews the status of the U.S. sites included on these lists as of July 2011 and addresses domestic prospects not included on the lists that have come into production since 1995.
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US nonfuel mineral exploration: Selected findings for 1995-2009 from the USGS