@misc{indiciae834e349bd61f,
  title = {The Orphan Lode Mine, Grand Canyon, Arizona; a case history of a mineralized, collapse-breccia pipe},
  author = {W.L. Chenoweth},
  year = {1986},
  doi = {10.3133/ofr86510},
  url = {https://pubs.usgs.gov/publication/ofr86510},
  note = {Source identifier: ofr86510}
}