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COMMITMENTS AND CONTINGENCIES (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2013 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jun. 02, 2016 lawsuit
Commitments and contingencies |  |  |  |
Future capital expenditures |  | $ 192,700,000 | $ 108,900,000 |
Compania Minera Maricunga | Legal Proceedings Contingent Liability |  |  |  |
Commitments and contingencies |  |  |  |
Regulatory fine | $ 40,000 |  |  |
Number of lawsuits | lawsuit |  |  |  | 2
2018 |  |  |  |
Commitments and contingencies |  |  |  |
Future minimum lease payments |  | 25,900,000 |  |
2019 |  |  |  |
Commitments and contingencies |  |  |  |
Future minimum lease payments |  | 12,500,000 |  |
2020 |  |  |  |
Commitments and contingencies |  |  |  |
Future minimum lease payments |  | 4,900,000 |  |
2021 |  |  |  |
Commitments and contingencies |  |  |  |
Future minimum lease payments |  | 2,900,000 |  |
2022 |  |  |  |
Commitments and contingencies |  |  |  |
Future minimum lease payments |  | 2,900,000 |  |
2023 and thereafter |  |  |  |
Commitments and contingencies |  |  |  |
Future minimum lease payments |  | $ 800,000 |  |

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