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ACQUISITION AND DIVESTITURES - Divestitures (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 16, 2021 | Nov. 10, 2020 | Oct. 13, 2020 | Aug. 04, 2020 | Mar. 04, 2020 | Nov. 28, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Massawa [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Proportion of Ownership Interest Sold |  |  |  |  | 90.00% |  |  |
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 |
Massawa [Member] | 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 |  |  |
Massawa [Member] | 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 |  |  |
Massawa [Member] | Contingent consideration [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Consideration paid (received) |  |  |  |  | 46,250 |  |  |
Massawa [Member] | At fair value |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Consideration paid (received) |  |  |  |  | 440,000 |  |  |
Massawa [Member] | At fair value | Contingent consideration [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Consideration paid (received) |  |  |  |  | $ 28,000 |  |  |
Morila [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Gain (loss) recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation |  |  |  |  |  |  | 27,000 |
Proportion of Ownership Interest Sold Combined With Partner |  | 80.00% |  |  |  |  |  |
Proportion of ownership interests held by non-controlling interests |  | 20.00% |  |  |  |  |  |
Morila [Member] | Cash and equivalents |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Portion of consideration paid (received) consisting of cash and cash equivalents |  | $ 28,800 |  |  |  |  |  |
Eskay Creek [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Gain (loss) recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation |  |  |  |  |  |  | 59,000 |
NSR Royalty Rate |  |  |  | 1.00% |  |  |  |
Eskay Creek [Member] | Skeena Resources Limited [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Number of shares in entity held by entity or by its subsidiaries or associates |  |  |  | 22,500,000 |  |  |  |
Investment Warrants, Exercise Price |  |  |  | $ 2.70 |  |  |  |
Eskay Creek [Member] | Contingent consideration [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Consideration paid (received) |  |  |  | $ 15,000 |  |  |  |
Bullfrog Mine [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Gain (loss) recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation |  |  |  |  |  |  | $ 22,000 |
Bullfrog Mine [Member] | Individual Mining Claim [Member] | Minimum |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
NSR Royalty Rate |  |  | 0.50% |  |  |  |  |
Bullfrog Mine [Member] | Individual Mining Claim [Member] | Maximum |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
NSR Royalty Rate |  |  | 5.50% |  |  |  |  |
Bullfrog Mine [Member] | Barrick Lands [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
NSR Royalty Rate |  |  | 2.00% |  |  |  |  |
Bullfrog Mine [Member] | Bullfrog Gold Corp. [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Number of shares in entity held by entity or by its subsidiaries or associates |  |  | 54,600,000 |  |  |  |  |
Investment Warrants, Exercise Price |  |  | $ 0.30 |  |  |  |  |
KCGM [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Proportion of Ownership Interest Sold |  |  |  |  |  | 50.00% |  |
Consideration paid (received) |  |  |  |  |  | $ 750,000 |  |
Gain (loss) recognised on measurement to fair value less costs to sell or on disposal of assets or disposal groups constituting discontinued operation |  |  |  |  |  | $ 408,000 |  | $ 408,000
Lagunas Norte [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Consideration paid (received) | $ 81,000 |  |  |  |  |  |  |
Portion of consideration paid (received) consisting of cash and cash equivalents | $ 20,000 |  |  |  |  |  |  |

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