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Inventories | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Inventories Explanatory [Abstract] |
Disclosure of inventories [text block] | Note 11 Inventories The composition of inventory at each period-end is as follows:
Type of inventory |  | 12/31/2018 ThUS$ |  |  | 12/31/2017 ThUS$ |  |  | 12/31/2016 ThUS$ |
Raw material reserves |  |  | 6,764 |  |  |  | 9,364 |  |  |  | 7,536 |
Supplies for production reserves |  |  | 26,840 |  |  |  | 22,257 |  |  |  | 23,610 |
Products-in-progress reserves |  |  | 423,621 |  |  |  | 456,333 |  |  |  | 482,261 |
Finished product reserves |  |  | 456,449 |  |  |  | 414,120 |  |  |  | 479,665 |
Total |  |  | 913,674 |  |  |  | 902,074 |  |  |  | 993,072 |
As of December 31, 2018, the Company has inventory of caliche ore (in piles or undergoing leaching process) available for processing valued at ThUS$347,100 and ThUS$333,194 as of December 31, 2017, (included in work in progress). Inventory reserves recognized as of December 31, 2018 amount to ThUS$105,282, and ThUS$96,284 as of December 31, 2017. For finished and in-process products, the provisions constituted include the provision associated with the lower value of stock (considers lower realizable value, uncertain future use, reprocessing costs, etc.), inventory differences and potential errors in the determination of inventories (e.g., errors in topography, grade, humidity, etc.), see Note 3.19. For inventories of raw materials, supplies, materials and parts, lower value provisions have been associated with the proportion of obsolete, defective or slow-moving materials and potential differences. The amount from of inventory that was reclassified to cost of sales during 2018 was ThUS$1,300,940. The amount from of inventory that was reclassified to cost of sales during 2017 was ThUS$1,230,321. The amount from of inventory that was reclassified to cost of sales during 2016 was ThUS$1,130,799. The breakdown of inventory reserves is detailed as follows:
Type of inventory |  | 12/31/2018 |  |  | 12/31/2017 |  |  | 12/31/2016 |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Raw material reserves |  |  | 1,838 |  |  |  | 93 |  |  |  | 93 |
Supplies for production |  |  | - |  |  |  | - |  |  |  | 920 |
Products-in-progress reserves |  |  | 82,673 |  |  |  | 80,249 |  |  |  | 50,925 |
Finished product reserves |  |  | 20,771 |  |  |  | 15,942 |  |  |  | 29,357 |
Total |  |  | 105,282 |  |  |  | 96,284 |  |  |  | 81,295 |
The Company has not delivered inventory as collateral for the periods indicated above. As of December 31, 2018 and, 2017, movements in provisions are detailed as follows:
Conciliation |  | 12/31/2018 |  |  | 12/31/2017 |  |  | 12/31/2016 |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Beginning balance |  |  | 96,284 |  |  |  | 81,295 |  |  |  | 80,369 |
Increase in Lower Value (1) |  |  | 7,845 |  |  |  | 19,515 |  |  |  | 2,255 |
Additional Provision Differences of Inventory. ( 2 ) |  |  | 3,176 |  |  |  | 573 |  |  |  | 6,071 |
Increase / Decrease eventual differences and others ( 3 ) |  |  | 2,436 |  |  |  | (178 | ) |  |  | (6,339 | )
Provision Used |  |  | (4,459 | ) |  |  | (4,921 | ) |  |  | (1,061 | )
Total changes |  |  | 8,998 |  |  |  | 14,989 |  |  |  | 926 |
Final balance |  |  | 105,282 |  |  |  | 96,284 |  |  |  | 81,295 |
| (1) | There are three types of Lower Value Provisions: Economic Realizable Lower Value, Potential Inventory with Uncertain Future Use and Reprocessing Costs of Off-Specification Products.
| (2) | Provisions for Inventory Differences generated when physical differences are detected when taking inventory, which exceed the tolerance levels for this process. At least two annual inventories are taken in the production sites and in the port in Chile (“zero sum” systems have immediate potential adjustments).
| (3) | This algorithm corresponds to diverse provision percentages based on the complexity in the measurement and rotation of stock, as well as standard differences based on previous profit and loss, as is the case with provisions in Commercial Offices.

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