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DERIVATIVE INSTRUMENTS - Impact of movements in market commodity prices (Details) lb in Millions | Dec. 31, 2019 lb oz | Dec. 31, 2018 lb oz
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Volumes subject to final pricing net of outstanding swaps |  |
Gold ounces | oz | 900.0 | 800.0
Copper pounds | lb | 0.5 | 1.6

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- Definition The volume of copper subject to final pricing net of outstanding swaps. + References No definition available. + Details
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- Definition The volume of gold subject to final pricing net of outstanding swaps. + References No definition available. + Details
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