@misc{indiciaef88f1ed72148,
  title = {Characterization of waste rock associated with acid drainage at the Penn Mine, California, by ground-based visible to short-wave infrared reflectance spectroscopy assisted by digital mapping},
  author = {S.I.C. Montero and G.H. Brimhall and Charles N. Alpers and G.A. Swayze},
  year = {2005},
  doi = {10.1016/j.chemgeo.2004.06.045},
  url = {https://pubs.usgs.gov/publication/70029395},
  note = {Source identifier: 70029395}
}