As part of the first-ever U.S. Geological Survey global assessment of undiscovered copper resources, data common to several regional spatial databases published by the U.S. Geological Survey, including one report from Finland and one from Greenland, we
Dicken, Connie L. cdicken@usgs.gov,Dunlap, Pamela pdunlap@usgs.gov,Parks, Heather L. hparks@usgs.gov,et al. Spatial database for a global assessment of undiscovered copper resources: Chapter Z in <em>Global mineral resource assessment</em>. 2016-01-01.