@misc{indiciae39174b748839,
  title = {Mineralogy, mineral chemistry, and paragenesis of gold, silver, and base-metal ores of the North Amethyst vein system, San Juan Mountains, Mineral County, Colorado},
  author = {Nora K. Foley and Stanton W. Caddey and Craig B. Byington and David M. Vardiman},
  year = {1993},
  doi = {10.3133/pp1537},
  url = {https://pubs.usgs.gov/publication/pp1537},
  note = {Source identifier: pp1537}
}