@misc{indiciae9622f5aca051,
  title = {Porphyry copper deposits of the world: Database and grade and tonnage models, 2008},
  author = {Donald A. Singer and Vladimir I. Berger and Barry C. Moring},
  year = {2008},
  doi = {10.3133/ofr20081155},
  url = {https://pubs.usgs.gov/publication/ofr20081155},
  note = {Source identifier: ofr20081155}
}