TY  - RPRT
TI  - Porphyry copper deposits of the world: database, map, and grade and tonnage models
AU  - Donald A. Singer
AU  - Vladimir Iosifovich Berger
AU  - Barry C. Moring
PY  - 2005
DO  - 10.3133/ofr20051060
UR  - https://pubs.usgs.gov/publication/ofr20051060
ID  - ofr20051060
ER  -