Version history for Barton, Mark, Brown, James, Haxel, Gordon, Hayes, Timothy, Jensen, Eric, Johnson, David, Kamilli, Robert, Long, Keith, Maher, David, and Seedorff, Eric, 2005, Center for Mineral Resources: U.S. Geological Survey-University of Arizona, Department of Geosciences porphyry copper deposit life cycles field conference, southeastern Arizona, May 21-22, 2002: U.S. Geological Survey Scientific Investigations Report 2005-5020, 12 p. [available on the World Wide Web at http://pubs.usgs.gov/sir/2005/5020/ ]. Version 1.0, January 9, 2006 Initial release online at http://pubs.usgs.gov/sir/2005/5020/