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Inventories | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Inventories Explanatory [Abstract] |
Disclosure of inventories [text block] | Note 8 Inventories The composition of inventory at each period-end is as follows:
Type of inventory |  | 12/31/2017 ThUS$ |  | 12/31/2016 ThUS$ |  | 12/31/2015 ThUS$ |
Raw material reserves |  |  | 9,364 |  |  | 7,536 |  |  | 4,844 |
Supplies for production reserves |  |  | 22,257 |  |  | 23,610 |  |  | 29,353 |
Products-in-progress reserves |  |  | 456,333 |  |  | 482,261 |  |  | 478,627 |
Finished product reserves |  |  | 414,120 |  |  | 479,665 |  |  | 491,022 |
Total |  |  | 902,074 |  |  | 993,072 |  |  | 1,003,846 |
As of December 31, 2017, the Company has inventory of caliche ore (in piles or undergoing leaching process) available for processing valued at ThUS$62,476 (ThUS$ 43,400 as of December 31, 2016), (included in work in progress). Inventory reserves recognized as of December 31, 2017 amount to ThUS$96,284, and ThUS$81,295 as of December 31, 2016 and ThUS$ 80,369 as of December 31, 2015. Inventory reserves have been made based on a technical study that covers the different variables affecting products in stock (density and humidity, among others). In the case of inventories of raw materials, supplies, materials and parts, provisions have been made at the lower value associated with the proportion of obsolete, defective or slow-moving materials. The breakdown of inventory reserves is detailed as follows:
Type of inventory |  | 12/31/2017 ThUS$ |  | 12/31/2016 ThUS$ |  | 12/31/2015 ThUS$ |
Raw material reserves |  |  | 93 |  |  | 93 |  |  | 93 |
Suministros para la producción |  |  | - |  |  | 920 |  |  | 920 |
Products-in-progress reserves |  |  | 80,249 |  |  | 50,925 |  |  | 53,187 |
Finished product reserves |  |  | 15,942 |  |  | 29,357 |  |  | 26,169 |
Total |  |  | 96,284 |  |  | 81,295 |  |  | 80,369 |
The Company has not delivered inventory as collateral for the periods indicated above. As of December 31, 2017, 2016 and 2015, movements in provisions are detailed as follows:
Reconciliation |  | 12/31/2017 |  | 12/31/2016 |  | 12/31/2015 |
|  | ThUS$ |  | ThUS$ |  | ThUS$ |
Opening balance |  |  | 81,295 |  |  | 80,369 |  |  | 82,966 |
Changes |  |  |  |  |  |  |  |  |  |
Additional provisions |  |  | 21,953 |  |  | 9,831 |  |  | 18,461 |
Increase (decrease) in existing provisions |  |  | (6,964) |  |  | (8,905) |  |  | (21,058) |
Total changes |  |  | 14,989 |  |  | 926 |  |  | (2,597) |
Final Balance |  |  | 96,284 |  |  | 81,295 |  |  | 80,369 |

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