Decreasing Metal Ore Grades:Are They Really Being Driven by the Depletion of High-Grade Deposits?
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West, James
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2011
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Abstract
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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Journal of Industrial Ecology
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15
Issue
2
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Environmental Sciences not elsewhere classified