@misc{indiciaee07f5a7d501b,
  title = {Mineral deposit grade-tonnage models},
  author = {Dan L. Mosier},
  year = {1983},
  doi = {10.3133/ofr83623},
  url = {https://pubs.usgs.gov/publication/ofr83623},
  note = {Source identifier: ofr83623}
}