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ACQUISITIONS AND DIVESTITURES ACQUISITION AND DIVESTITURES (Details) - Massawa [Member] - USD ($) $ in Thousands |  | 3 Months Ended
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Mar. 04, 2020 | Mar. 31, 2020
Disclosure of detailed information about business combination [line items] |  |
Proportion of Ownership Interest Sold | 90.00% |
Consideration paid (received) | $ 440,000 |
Proportion of consideration | 92.50% |
Loan issued for part financing | $ 25,000 |
Gain (loss) recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation |  | $ 54,000
Contingent Payment [Member] |  |
Disclosure of detailed information about business combination [line items] |  |
Portion of consideration paid (received) consisting of cash and cash equivalents | 46,250 |
Contingent Payment [Member] | At fair value [member] |  |
Disclosure of detailed information about business combination [line items] |  |
Portion of consideration paid (received) consisting of cash and cash equivalents | 28,000 |
Cash and equivalents |  |
Disclosure of detailed information about business combination [line items] |  |
Portion of consideration paid (received) consisting of cash and cash equivalents | $ 256,000 |
Teranga Gold Corporation [Member] |  |
Disclosure of detailed information about business combination [line items] |  |
Number of shares in entity held by entity or by its subsidiaries or associates | 19,164,403 |
Fair value of shares | $ 104,000 |
Debt instruments issued | $ 225,000 |

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