@misc{indiciaede4aae0104ee,
  title = {Mineral commodity profiles — Gold},
  author = {W. C. Butterman and Earle B. Amey},
  year = {2005},
  doi = {10.3133/ofr02303},
  url = {https://pubs.usgs.gov/publication/ofr02303},
  note = {Source identifier: ofr02303}
}