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DERIVATIVE INSTRUMENTS - Provisionally priced sales (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
GAIN (LOSS) ON THE PROVISIONAL PRICING OF CONCENTRATE SALES |  |
Realized | $ 0.5 | $ (8.9)
Unrealized | 1.5 | (1.6)
Total gain (loss) | 2.0 | (10.5)
Gold |  |
GAIN (LOSS) ON THE PROVISIONAL PRICING OF CONCENTRATE SALES |  |
Realized | 2.2 | (1.2)
Unrealized | 0.5 | 1.1
Total gain (loss) | 2.7 | (0.1)
Copper |  |
GAIN (LOSS) ON THE PROVISIONAL PRICING OF CONCENTRATE SALES |  |
Realized | (1.7) | (7.7)
Unrealized | 1.0 | (2.7)
Total gain (loss) | $ (0.7) | $ (10.4)

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- Definition The gains (losses) on the provisionally pricing of concentrate sales which realised during the reporting period. + References No definition available. + Details
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- Definition Totals gains (losses) on the provisionally pricing of concentrate sales which recognised during the reporting period. + References No definition available. + Details
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- Definition The gains (losses) on the provisionally pricing of concentrate sales which recognised as unrealised during the reporting period. + References No definition available. + Details
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