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DERIVATIVE INSTRUMENTS (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
DERIVATIVE ASSETS |  |
Total derivative assets | $ 0.2 | $ 0.7
DERIVATIVE LIABILITIES |  |
Total derivative liabilities | 26.4 | 5.5
Unsettled provisionally priced concentrate derivatives, and swap contracts |  |
DERIVATIVE ASSETS |  |
Total derivative assets | 0.2 | 0.0
DERIVATIVE LIABILITIES |  |
Total derivative liabilities | 0.0 | 0.7
Copper price option contract |  |
DERIVATIVE ASSETS |  |
Total derivative assets | 0.0 | 0.7
Gold price option contracts |  |
DERIVATIVE LIABILITIES |  |
Total derivative liabilities | $ 26.4 | $ 4.8

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