10-Q: Quarterly report
Soaring prices of by-products such as gold and silver enable two major copper giants to achieve 'negative cost mining.'
① Due to the surge in prices of by-products such as gold and silver, the production costs for copper at Southern Copper and Vale SA have turned negative; ② Southern Copper's cash cost per pound of copper produced in the first quarter was negative $0.11, compared to positive $0.77 in the same period last year.
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