Porphyry copper deposits of the World [electronic resource] : database, maps, grade and tonnage models / by Donald A. Singer, Vladimir I. Berger, and Barry C. Moring.
Imprint
Menlo Park, Calif. : U.S. Dept. of the Interior, U.S. Geological Survey, 2005.
Mode of access: Internet from the USGS web site. Address as of: 02/06/08: http://pubs.usgs.gov/of/2005/1060/of2005-1060.pdf; current access available via PURL.