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REVENUE: - Receivables by reporting segment (Details) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 USD ($) T | Dec. 31, 2018 USD ($)
Opening and closing balances of receivables |  |
Trade receivables | $ 842.0 | $ 822.4
Related parties, current | 22.3 | 101.5
Related parties, non-current | 60.0 |
Corporate, other and eliminations |  |
Opening and closing balances of receivables |  |
Related parties, current | $ 8.2 | 19.9
Copper concentrates |  |
Long Term Contracts |  |
Long term contracts | T | 1,090,000 |
Copper cathodes |  |
Long Term Contracts |  |
Long term contracts | T | 48,000 |
Molybdenum concentrates |  |
Long Term Contracts |  |
Long term contracts | T | 24,446 |
Sulfuric acid |  |
Long Term Contracts |  |
Long term contracts | T | 331,620 |
Mexican Open-pit | Operating segment |  |
Opening and closing balances of receivables |  |
Trade receivables | $ 430.1 | 505.9
Related parties, current | 14.1 | 81.6
Related parties, non-current | 60.0 |
Mexican IMMSA Unit | Operating segment |  |
Opening and closing balances of receivables |  |
Trade receivables | 41.8 | 50.5
Peruvian Operations | Operating segment |  |
Opening and closing balances of receivables |  |
Trade receivables | $ 370.1 | $ 266.0

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