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Exploration in operating units - Additional information (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Exploration in operating units |  |  |
Disbursement of exploration in operating activities | $ 28.0 | $ 44.2 | $ 89.7

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- Definition It represents amount of proceeds of exploration in operating activities + References No definition available. + Details
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