@misc{indiciae2bdc66fd4ec1,
  title = {Distribution of gold in porphyry copper deposits},
  author = {D. P. Cox and D.A. Singer},
  year = {1988},
  doi = {10.3133/ofr8846},
  url = {https://pubs.usgs.gov/publication/ofr8846},
  note = {Source identifier: ofr8846}
}