@misc{indiciaecae185fca0eb,
  title = {World class base and precious metal deposits; a quantitative analysis},
  author = {Donald A. Singer},
  year = {1995},
  doi = {10.2113/gsecongeo.90.1.88},
  url = {https://pubs.usgs.gov/publication/70197194},
  note = {Source identifier: 70197194}
}