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COST OF SALES (Tables) | 12 Months Ended
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Dec. 31, 2021
Analysis of income and expense [abstract] |
Schedule of cost of sales |
|  | Year ended December 31,
|  | 2021 |  | 2020 |  | 2019
Inventories at the beginning of the year |  | 2,001,781 |  |  | 2,158,298 |  |  | 2,689,829 |
Translation differences |  | — |  |  | — |  |  | (21,919) |
Plus: Charges for the year |  |  |  |  |  |
Raw materials and consumables used and other movements |  | 9,835,504 |  |  | 5,359,938 |  |  | 6,165,654 |
Services and fees |  | 151,251 |  |  | 112,924 |  |  | 151,373 |
Labor cost |  | 689,614 |  |  | 546,045 |  |  | 611,615 |
Depreciation of property, plant and equipment |  | 514,746 |  |  | 527,283 |  |  | 508,934 |
Amortization of intangible assets |  | 23,519 |  |  | 14,624 |  |  | 17,805 |
Maintenance expenses |  | 582,633 |  |  | 371,368 |  |  | 467,090 |
Office expenses |  | 7,741 |  |  | 6,131 |  |  | 8,513 |
Insurance |  | 12,309 |  |  | 10,641 |  |  | 9,674 |
Change of obsolescence allowance |  | 3,965 |  |  | (1,279) |  |  | 8,413 |
Recovery from sales of scrap and by-products |  | (37,597) |  |  | (20,892) |  |  | (23,793) |
Others |  | 17,909 |  |  | 16,623 |  |  | 17,550 |
Less: Inventories at the end of the year |  | (3,908,305) |  |  | (2,001,781) |  |  | (2,158,298) |
Cost of Sales |  | 9,895,070 |  |  | 7,099,923 |  |  | 8,452,440 |

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