TY  - RPRT
TI  - Porphyry copper deposit density
AU  - Donald A. Singer
AU  - Vladimir Berger
AU  - W. David Menzie
AU  - Byron R. Berger
PY  - 2005
DO  - 10.2113/gsecongeo.100.3.491
UR  - https://pubs.usgs.gov/publication/70197200
ID  - 70197200
ER  -