Decreasing Metal Ore Grades

@article{West2011DecreasingMO,
  title={Decreasing Metal Ore Grades},
  author={James West},
  journal={Journal of Industrial Ecology},
  year={2011},
  volume={15}
}
  • J. West
  • Published 1 April 2011
  • Geology
  • Journal of Industrial Ecology
This massive decrease in copper ore grades was not driven by depletion of higher grade deposits with resulting higher copper prices. It was instead a direct result of innovation that converted massive supplies of previously worthless "waste" rock into valuable ore. 

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