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Provisions and other non-financial liabilities (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure of other provisions [abstract] |
Disclosure of detailed information about provisions [Text Block] | 18.1 Types of provisions
|  | As of December 31, 2019 |  |  | As of December 31, 2018 |
Types of provisions |  | Current |  |  | Non-current |  |  | Total |  |  | Current |  |  | Non-current |  |  | Total |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Provision for legal complaints (1) |  |  | 13,472 |  |  |  | 1,452 |  |  |  | 14,924 |  |  |  | 11,862 |  |  |  | 3,000 |  |  |  | 14,862 |
Provision for dismantling, restoration and rehabilitation cost (2) |  |  | - |  |  |  | 33,238 |  |  |  | 33,238 |  |  |  | - |  |  |  | 28,822 |  |  |  | 28,822 |
Other provisions (3) |  |  | 97,093 |  |  |  | - |  |  |  | 97,093 |  |  |  | 94,335 |  |  |  | - |  |  |  | 94,335 |
Total |  |  | 110,565 |  |  |  | 34,690 |  |  |  | 145,255 |  |  |  | 106,197 |  |  |  | 31,822 |  |  |  | 138,019 |
(1) These provisions correspond to legal processes that are pending resolution or that have not yet been disbursed. These provisions are mainly related to litigation involving the subsidiaries located in Chile, Brazil and the United States (see note 21.1). (2) The provisions related to commitments with Sernageomin have been incorporated through the issuance of a guarantee for the restoration of the place where the production sites are located. (3) See Note 18.2
Description of detailed information about other current and noncurrent provision [Text Block] | 18.2 Description of other provisions
Current provisions, other short-term provisions |  | As of December ‎ 31, 2019 |  |  | As of December ‎ 31, 2018 |
|  | ThUS$ |  |  | ThUS$ |
Rent under lease contract (1) |  |  | 90,320 |  |  |  | 84,826 |
Provision for additional tax related to foreign loans |  |  | 543 |  |  |  | 471 |
End of agreement bonus |  |  | 3,641 |  |  |  | 5,129 |
Directors’ per diem allowance |  |  | 1,802 |  |  |  | 2,881 |
Miscellaneous provisions |  |  | 787 |  |  |  | 1,028 |
Total |  |  | 97,093 |  |  |  | 94,335 |
(1) Payment obligations for the lease contract with CORFO: These correspond to obligations assumed in the Lease Agreement. Part of these obligations are the quarterly lease payments to Corfo, according to SQM Salar's product sales from leased mining properties. Since 2018, another part are the annual contributions by SQM Salar to research and development, to local communities to the Antofagasta Regional Government and to the municipalities of San Pedro de Atacama, María Elena and Antofagasta .
Disclosure of other current liabilities [text block] |
| 18.3 | Other non-financial liabilities, current
Description of other liabilities |  | As of December ‎ 31, 2019 |  |  | As of December ‎ 31, 2018 |
|  | ThUS$ |  |  | ThUS$ |
Tax withholdings |  |  | 3,345 |  |  |  | 4,782 |
VAT payable |  |  | 3,465 |  |  |  | 7,345 |
Guarantees received |  |  | 2,641 |  |  |  | 2,641 |
Accrual for dividend |  |  | 68,890 |  |  |  | 109,670 |
Monthly tax provisional payments |  |  | 16,659 |  |  |  | 21,001 |
Deferred income |  |  | 3,033 |  |  |  | 18,574 |
Withholdings from employees and salaries payable |  |  | 4,575 |  |  |  | 6,052 |
Accrued vacations (1) |  |  | 21,686 |  |  |  | 20,070 |
Other current liabilities |  |  | 2,605 |  |  |  | 4,489 |
Total |  |  | 126,899 |  |  |  | 194,624 |
(1) Vacation benefit (short-term benefits to employees, current) is in line with the provisions established in Chile’s Labor Code, which indicates that employees with more than a year of service will be entitled to annual vacation for a period of at least fifteen paid business days . The Company provides the benefit of two additional vacation days .
Disclosure of reconciliation of changes in other provisions [Text Block] | 18.4 Changes in provisions
Description of items that gave rise to variations as of December ‎ 31, 2019 |  | Legal complaints |  |  | Provision for ‎ dismantling, ‎ restoration and ‎ rehabilitation cost |  |  | Other provisions |  |  | Total |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Total provisions, initial balance |  |  | 14,862 |  |  |  | 28,822 |  |  |  | 94,335 |  |  |  | 138,019 |
Changes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional provisions |  |  | 4,111 |  |  |  | 4,416 |  |  |  | 150,314 |  |  |  | 158,841 |
Provision used |  |  | (4,049 | ) |  |  | - |  |  |  | (147,532 | ) |  |  | (151,581 | )
Increase(decrease) in foreign currency exchange |  |  | - |  |  |  | - |  |  |  | (24 | ) |  |  | (24 | )
others |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Total Increase (decreases) |  |  | 62 |  |  |  | 4,416 |  |  |  | 2,758 |  |  |  | 7,236 |
Total |  |  | 14,924 |  |  |  | 33,238 |  |  |  | 97,093 |  |  |  | 145,255 |
Description of items that gave rise to variations as of December ‎ 31, 2018 |  | Legal complaints |  |  | Provision for ‎ dismantling, ‎ restoration and ‎ rehabilitation cost |  |  | Other provisions |  |  | Total |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Total provisions, initial balance |  |  | 19,419 |  |  |  | 26,954 |  |  |  | 47,073 |  |  |  | 93,446 |
Changes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional provisions |  |  | 1,000 |  |  |  | 1,820 |  |  |  | 181,244 |  |  |  | 184,064 |
Provision used |  |  | (5,557 | ) |  |  | - |  |  |  | (133,949 | ) |  |  | (139,506 | )
Increase(decrease) in foreign currency exchange |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
others |  |  | - |  |  |  | 48 |  |  |  | (33 | ) |  |  | 15 |
Total Increase (decreases) |  |  | (4,557 | ) |  |  | 1,868 |  |  |  | 47,262 |  |  |  | 44,573 |
Total |  |  | 14,862 |  |  |  | 28,822 |  |  |  | 94,335 |  |  |  | 138,019 |
Description of items that gave rise to variations as of December ‎ 31, 2017 |  | Legal complaints |  |  | Provision for ‎ dismantling, ‎ restoration and ‎ rehabilitation cost |  |  | Other provisions |  |  | Total |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Total provisions, initial balance |  |  | 23,867 |  |  |  | 5,890 |  |  |  | 21,089 |  |  |  | 50,846 |
Changes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional provisions |  |  | 6,352 |  |  |  | 21,064 |  |  |  | 33,507 |  |  |  | 60,923 |
Provision used |  |  | (10,800 | ) |  |  | - |  |  |  | (7,538 | ) |  |  | (18,338 | )
Increase(decrease) in foreign currency exchange |  |  | - |  |  |  | - |  |  |  | 9 |  |  |  | 9 |
others |  |  | - |  |  |  | - |  |  |  | 6 |  |  |  | 6 |
Total Increase (decreases) |  |  | (4,448 | ) |  |  | 21,064 |  |  |  | 25,984 |  |  |  | 42,600 |
Total |  |  | 19,419 |  |  |  | 26,954 |  |  |  | 47,073 |  |  |  | 93,446 |

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