http://minerals.usgs.gov/west/projects/nngd.htm "Western Region Gold Deposits (completed project)" Western Region Gold Deposits http://minerals.usgs.gov/west/projects/nngd.htm http://minerals.usgs.gov/west/projects/nngd.htm "Western Region Gold Deposits (completed project)" USGS http://minerals.usgs.gov/west/projects/nngd.htm