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v3.19.1

COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands, gal in Millions | May 19, 2017 USD ($) l | Aug. 05, 2015 gal | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 02, 2016 lawsuit
--- | --- | --- | --- | --- | ---
Commitments and contingencies |  |  |  |  |
Future capital expenditures |  |  | $ 101,900 | $ 192,700 |
Volume of contaminated water | gal |  | 3 |  |  |
Compania Minera Maricunga | Legal Proceedings Contingent Liability |  |  |  |  |
Commitments and contingencies |  |  |  |  |
Number of lawsuits | lawsuit |  |  |  |  | 2
Volume of diesel escaped containment | l | 15,000 |  |  |  |
Penalty for regulatory non-compliance | $ 35 |  |  |  |
2019 |  |  |  |  |
Commitments and contingencies |  |  |  |  |
Future minimum lease payments |  |  | 11,400 |  |
2020 |  |  |  |  |
Commitments and contingencies |  |  |  |  |
Future minimum lease payments |  |  | 9,100 |  |
2021 |  |  |  |  |
Commitments and contingencies |  |  |  |  |
Future minimum lease payments |  |  | 8,500 |  |
2022 |  |  |  |  |
Commitments and contingencies |  |  |  |  |
Future minimum lease payments |  |  | 5,000 |  |
2023 |  |  |  |  |
Commitments and contingencies |  |  |  |  |
Future minimum lease payments |  |  | 5,000 |  |
2024 and thereafter |  |  |  |  |
Commitments and contingencies |  |  |  |  |
Future minimum lease payments |  |  | $ 31,300 |  |

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