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ACQUISITIONS - Chulbatkan (Details) oz in Thousands, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 16, 2020 USD ($) | Jul. 31, 2019 USD ($) oz $ / oz | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Acquisitions and Dispositions |  |  |  |
Cash consideration paid |  |  | $ 30.0 | $ 304.2
Chulbatkan |  |  |  |
Acquisitions and Dispositions |  |  |  |
Consideration |  | $ 283.0 |  |
Net Smelter Return |  | 1.50% |  |
Future proven and probable reserves per ounce | $ / oz |  | 50 |  |
Declared proven and probable ounces | oz |  | 3,250 |  |
Buyback right (as percent of smelter return) |  | 0.33% |  |
Right to buyback royalty |  | $ 10.0 |  |
Period for buyback |  | 24 months |  |
Cash consideration paid | $ 141.5 |  |  |
Percentage of consideration paid in first installment | 50.00% |  |  |
Final installment which can be paid in shares | $ 141.5 |  |  |
Chulbatkan | Minimum |  |  |  |
Acquisitions and Dispositions |  |  |  |
Final installment which can paid in shares (as percent) | 60.00% |  |  |
Chulbatkan | Maximum |  |  |  |
Acquisitions and Dispositions |  |  |  |
Final installment which can paid in shares (as percent) | 100.00% |  |  |

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