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15. Inventories (Details) - ARS ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
SummaryOfInventoriesLineItems [Line Items] |  |
Inventories | $ 1,259,799 | $ 649,580
Supplies and spare-parts |  |
SummaryOfInventoriesLineItems [Line Items] |  |
Inventories | 1,252,292 | 589,339
Advance to suppliers |  |
SummaryOfInventoriesLineItems [Line Items] |  |
Inventories | $ 7,507 | $ 60,241

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