@misc{indiciae01d8ca6805c6,
  title = {CHANGES IN GRADE, VOLUME AND CONTAINED GOLD DURING THE MINING LIFE-CYCLE OF GOLD PLACER DEPOSITS.},
  author = {J. D. Bliss and G. J. Orris and W. D. Menzie},
  year = {1987},
  url = {https://pubs.usgs.gov/publication/70015206},
  note = {Source identifier: 70015206}
}