@misc{indiciae9b0efc05e0d1,
  title = {Porphyry copper deposits of the world: database, map, and grade and tonnage models},
  author = {Donald A. Singer and Vladimir Iosifovich Berger and Barry C. Moring},
  year = {2005},
  doi = {10.3133/ofr20051060},
  url = {https://pubs.usgs.gov/publication/ofr20051060},
  note = {Source identifier: ofr20051060}
}