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Property, plant and equipment | 12 Months Ended
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Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [abstract] |
Disclosure of detailed information about property, plant and equipment explanatory [Text Block] | Note 15 Property, plant and equipment As of December 31, 2019 and 2018, the detail of property, plant and equipment is as follows: 15.1 Types of property, plant and equipment
Description of types of property, plant and equipment |  | As of December 31, ‎ 2019 |  |  | As of December 31, ‎ 2018 |
|  | ThUS$ |  |  | ThUS$ |
Property, plant and equipment, net |  |  |  |  |  |  |  |
Land |  |  | 23,620 |  |  |  | 24,695 |
Buildings (1) |  |  | 252,969 |  |  |  | 238,808 |
Other property, plant and equipment |  |  | 32,604 |  |  |  | 28,175 |
Transport equipment (2) |  |  | 6,042 |  |  |  | 2,892 |
Supplies and accessories |  |  | 4,579 |  |  |  | 4,722 |
Office equipment |  |  | 420 |  |  |  | 513 |
Network and communication equipment |  |  | 663 |  |  |  | 692 |
Mining assets |  |  | 23,174 |  |  |  | 11,501 |
IT equipment |  |  | 4,359 |  |  |  | 4,980 |
Energy generating assets |  |  | 5,998 |  |  |  | 6,117 |
Constructions in progress |  |  | 375,316 |  |  |  | 207,830 |
Machinery, plant and equipment (3) |  |  | 877,326 |  |  |  | 923,898 |
Total |  |  | 1,607,070 |  |  |  | 1,454,823 |
(1) The buildings line item includes Th US$ 25,742 corresponding to right-of-use assets ; (2) The line item “Transport equipment” I ncludes Th US$ 3,356. corresponding to right-of-use assets ; (3) the property, plant and equipment line item includes ThUS$ 8,066 corresponding to right-of-use assets; the total includes Th US$ 37,164. corresponding to right-of-use assets (IFRS 16) |
Property, plant and equipment, gross |  |  |  |  |  |  |  |
Land |  |  | 23,620 |  |  |  | 24,695 |
Buildings (1) |  |  | 695,316 |  |  |  | 648,719 |
Other property, plant and equipment |  |  | 257,206 |  |  |  | 245,731 |
Transport equipment (2) |  |  | 16,036 |  |  |  | 11,668 |
Supplies and accessories |  |  | 25,531 |  |  |  | 24,456 |
Office equipment |  |  | 11,441 |  |  |  | 11,377 |
Network and communication equipment |  |  | 8,009 |  |  |  | 7,505 |
Mining assets |  |  | 161,619 |  |  |  | 132,309 |
IT equipment |  |  | 28,693 |  |  |  | 29,955 |
Energy generating assets |  |  | 38,495 |  |  |  | 36,930 |
Constructions in progress |  |  | 375,316 |  |  |  | 207,830 |
Machinery, plant and equipment (3) |  |  | 3,154,435 |  |  |  | 3,068,862 |
Total |  |  | 4,795,717 |  |  |  | 4,450,037 |
(1) The buildings line item includes Th US$ 29,289 corresponding to right-of-use assets; (2) The line item “Transport equipment” I ncludes ThUS$ 3,893 corresponding to right-of-use assets ; (3) the property, plant and equipment line item includes Th US$ 11,933 corresponding to right-of-use assets; the total includes Th US $45,115 corresponding to right-of-use assets (IFRS 16) |
Accumulated depreciation and value impairment of property, plant and equipment, total |  |  |  |  |  |  |  |
Accumulated depreciation and impairment of buildings (1) |  |  | (442,347 | ) |  |  | (409,911 | )
Accumulated depreciation and impairment of other property, plant and equipment |  |  | (224,602 | ) |  |  | (217,556 | )
Accumulated depreciation and impairment of transport equipment (2) |  |  | (9,994 | ) |  |  | (8,776 | )
Accumulated depreciation and impairment of supplies and accessories |  |  | (20,952 | ) |  |  | (19,734 | )
Accumulated depreciation and impairment of office equipment |  |  | (11,021 | ) |  |  | (10,864 | )
Accumulated depreciation and impairment of network and communication equipment |  |  | (7,346 | ) |  |  | (6,813 | )
Accumulated depreciation and impairment of mining assets |  |  | (138,445 | ) |  |  | (120,808 | )
Accumulated depreciation and impairment of IT equipment |  |  | (24,334 | ) |  |  | (24,975 | )
Accumulated depreciation and impairment of energy generating assets |  |  | (32,497 | ) |  |  | (30,813 | )
Accumulated depreciation and impairment of machinery, plant and equipment (3) |  |  | (2,277,109 | ) |  |  | (2,144,964 | )
Total |  |  | (3,188,647 | ) |  |  | (2,995,214 | )
(1) The buildings line item includes Th US$ (3,547) corresponding to depreciation of right-of-use assets ; (2) The line item “Transport equipment”. I ncludes Th US$ (537) corresponding to right-of-use assets ; (3) The property, plant and equipment line item includes Th US$ (3,867) corresponding to depreciation of right-of-use assets; the total includes Th US$ (7,951) corresponding to depreciation of right-of-use assets (IFRS 16).
Description of Machinery, plant and equipment |  | As of December ‎ 31, 2019 |  |  | As of December ‎ 31, 2018 |
|  | ThUS$ |  |  | ThUS$ |
Machinery, plant and equipment, net |  |  |  |  |  |  |  |
Pumps |  |  | 32,525 |  |  |  | 34,145 |
Conveyor Belt |  |  | 21,911 |  |  |  | 22,082 |
Crystallizer |  |  | 24,102 |  |  |  | 27,112 |
Plant Equipment |  |  | 170,263 |  |  |  | 188,934 |
Tanks |  |  | 14,159 |  |  |  | 14,876 |
Filter |  |  | 27,080 |  |  |  | 29,300 |
Electrical equipment/facilities |  |  | 92,090 |  |  |  | 96,179 |
Other Property, Plant & Equipment |  |  | 53,396 |  |  |  | 58,997 |
Site Closure |  |  | 12,056 |  |  |  | 12,967 |
Right-of-use assets |  |  | 8,066 |  |  |  | - |
Piping |  |  | 96,402 |  |  |  | 98,498 |
Well |  |  | 238,670 |  |  |  | 250,045 |
Pond |  |  | 41,319 |  |  |  | 42,903 |
Spare Parts |  |  | 45,287 |  |  |  | 47,860 |
Total |  |  | 877,326 |  |  |  | 923,898 |
| 15.2 | Reconciliation of changes in property, plant and equipment by type:
Reconciliation of changes in property, plant and equipment by class as of December 31, 2019 and 2018:
Reconciliation of changes in property, plant and equipment by class as of December 31, 2019, gross amount |  | Land |  |  | Buildings |  |  | Other property, plant and equipment |  |  | Transport equipment |  |  | Supplies and accessories |  |  | Equipment office |  |  | Network and communication equipment |  |  | Mining assets |  |  | IT equipment |  |  | Energy generating assets |  |  | Assets under construction |  |  | Machinery, plant and equipment |  |  | Property, plant and equipment |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Opening balance |  |  | 24,695 |  |  |  | 648,719 |  |  |  | 245,731 |  |  |  | 11,668 |  |  |  | 24,456 |  |  |  | 11,377 |  |  |  | 7,505 |  |  |  | 132,309 |  |  |  | 29,955 |  |  |  | 36,930 |  |  |  | 207,830 |  |  |  | 3,068,862 |  |  |  | 4,450,037 |
Initial recognition of IFRS 16 |  |  | - |  |  |  | 29,289 |  |  |  | - |  |  |  | 3,893 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 11,933 |  |  |  | 45,115 |
Balance with recognition of IFRS 16 |  |  | 24,695 |  |  |  | 678,008 |  |  |  | 245,731 |  |  |  | 15,561 |  |  |  | 24,456 |  |  |  | 11,377 |  |  |  | 7,505 |  |  |  | 132,309 |  |  |  | 29,955 |  |  |  | 36,930 |  |  |  | 207,830 |  |  |  | 3,080,795 |  |  |  | 4,495,152 |
Additions |  |  | - |  |  |  | 290 |  |  |  | 332 |  |  |  | - |  |  |  | 37 |  |  |  | 43 |  |  |  | 159 |  |  |  | - |  |  |  | 492 |  |  |  | - |  |  |  | 314,236 |  |  |  | 6,077 |  |  |  | 321,666 |
Disposals |  |  | - |  |  |  | - |  |  |  | (858 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (3 | ) |  |  | - |  |  |  | - |  |  |  | (17 | ) |  |  | (878 | )
Increase (decrease) in foreign currency translation difference |  |  | (35 | ) |  |  | (72 | ) |  |  | (4 | ) |  |  | (2 | ) |  |  | (9 | ) |  |  | (3 | ) |  |  | - |  |  |  | - |  |  |  | (6 | ) |  |  | - |  |  |  | - |  |  |  | (72 | ) |  |  | (203 | )
Reclassifications |  |  | 132 |  |  |  | 18,526 |  |  |  | 12,456 |  |  |  | 477 |  |  |  | 745 |  |  |  | - |  |  |  | 89 |  |  |  | 16,901 |  |  |  | 1,289 |  |  |  | 1,565 |  |  |  | (140,104 | ) |  |  | 88,088 |  |  |  | 164 |
Other increases (decreases) |  |  | - |  |  |  | - |  |  |  | (451 | ) |  |  | - |  |  |  | 302 |  |  |  | 24 |  |  |  | 256 |  |  |  | 12,409 |  |  |  | (3,034 | ) |  |  | - |  |  |  | (6,646 | ) |  |  | (20,436 | ) |  |  | (17,576 | )
Decreases for classification as held for sale |  |  | (1,172 | ) |  |  | (1,436 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (2,608 | )
Total changes |  |  | (1,075 | ) |  |  | 17,308 |  |  |  | 11,475 |  |  |  | 475 |  |  |  | 1,075 |  |  |  | 64 |  |  |  | 504 |  |  |  | 29,310 |  |  |  | (1,262 | ) |  |  | 1,565 |  |  |  | 167,486 |  |  |  | 73,640 |  |  |  | 300,565 |
Closing balance |  |  | 23,620 |  |  |  | 695,316 |  |  |  | 257,206 |  |  |  | 16,036 |  |  |  | 25,531 |  |  |  | 11,441 |  |  |  | 8,009 |  |  |  | 161,619 |  |  |  | 28,693 |  |  |  | 38,495 |  |  |  | 375,316 |  |  |  | 3,154,435 |  |  |  | 4,795,717 |
Reconciliation of changes in property, plant and equipment by class as of December 31, 2019, accumulated depreciation |  | Land |  |  | Buildings |  |  | Other property, plant and equipment |  |  | Transport equipment |  |  | Supplies and accessories |  |  | Equipment office |  |  | Network and communication equipment |  |  | Mining assets |  |  | IT equipment |  |  | Energy generating assets |  |  | Assets under construction |  |  | Machinery, plant and equipment |  |  | Property, plant and equipment |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Opening balance |  |  | - |  |  |  | (409,911 | ) |  |  | (217,556 | ) |  |  | (8,776 | ) |  |  | (19,734 | ) |  |  | (10,864 | ) |  |  | (6,813 | ) |  |  | (120,808 | ) |  |  | (24,975 | ) |  |  | (30,813 | ) |  |  | - |  |  |  | (2,144,964 | ) |  |  | (2,995,214 | )
Changes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposals |  |  | - |  |  |  | - |  |  |  | 858 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 1 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 859 |
Depreciation expense |  |  | - |  |  |  | (32,547 | ) |  |  | (8,013 | ) |  |  | (1,220 | ) |  |  | (1,144 | ) |  |  | (161 | ) |  |  | (426 | ) |  |  | (7,033 | ) |  |  | (1,158 | ) |  |  | (1,676 | ) |  |  | - |  |  |  | (142,866 | ) |  |  | (196,244 | )
Impairment |  |  | - |  |  |  | (49 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (49 | )
Increase (decrease) in foreign currency translation difference |  |  | - |  |  |  | 28 |  |  |  | 3 |  |  |  | 1 |  |  |  | 7 |  |  |  | 1 |  |  |  | - |  |  |  | - |  |  |  | 5 |  |  |  | - |  |  |  | - |  |  |  | 34 |  |  |  | 79 |
Reclassifications |  |  | - |  |  |  | 7 |  |  |  | (6 | ) |  |  | 1 |  |  |  | 6 |  |  |  | - |  |  |  | 1 |  |  |  | - |  |  |  | (5 | ) |  |  | - |  |  |  | - |  |  |  | (207 | ) |  |  | (203 | )
Other increases (decreases) (*) |  |  | - |  |  |  | (155 | ) |  |  | 112 |  |  |  | - |  |  |  | (87 | ) |  |  | 3 |  |  |  | (108 | ) |  |  | (10,604 | ) |  |  | 1,798 |  |  |  | (8 | ) |  |  | - |  |  |  | 10,894 |  |  |  | 1,845 |
Decreases for classification as held for sale |  |  | - |  |  |  | 280 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 280 |
Total changes |  |  | - |  |  |  | (32,436 | ) |  |  | (7,046 | ) |  |  | (1,218 | ) |  |  | (1,218 | ) |  |  | (157 | ) |  |  | (533 | ) |  |  | (17,637 | ) |  |  | 641 |  |  |  | (1,684 | ) |  |  | - |  |  |  | (132,145 | ) |  |  | (193,433 | )
Closing balance |  |  | - |  |  |  | (442,347 | ) |  |  | (224,602 | ) |  |  | (9,994 | ) |  |  | (20,952 | ) |  |  | (11,021 | ) |  |  | (7,346 | ) |  |  | (138,445 | ) |  |  | (24,334 | ) |  |  | (32,497 | ) |  |  | - |  |  |  | (2,277,109 | ) |  |  | (3,188,647 | )
Reconciliation of changes in property, plant and equipment by class as of December 31, 2019, net amount |  | Land |  |  | Buildings |  |  | Other property, plant and equipment |  |  | Transport equipment |  |  | Supplies and accessories |  |  | Equipment office |  |  | Network and communication equipment |  |  | Mining assets |  |  | IT equipment |  |  | Energy generating assets |  |  | Assets under construction |  |  | Machinery, plant and equipment |  |  | Property, plant and equipment |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Opening balance |  |  | 24,695 |  |  |  | 238,808 |  |  |  | 28,175 |  |  |  | 2,892 |  |  |  | 4,722 |  |  |  | 513 |  |  |  | 692 |  |  |  | 11,501 |  |  |  | 4,980 |  |  |  | 6,117 |  |  |  | 207,830 |  |  |  | 923,898 |  |  |  | 1,454,823 |
Initial recognition of IFRS 16 |  |  | - |  |  |  | 29,289 |  |  |  | - |  |  |  | 3,893 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 11,933 |  |  |  | 45,115 |
Balance with recognition of IFRS 16 |  |  | 24,695 |  |  |  | 268,097 |  |  |  | 28,175 |  |  |  | 6,785 |  |  |  | 4,722 |  |  |  | 513 |  |  |  | 692 |  |  |  | 11,501 |  |  |  | 4,980 |  |  |  | 6,117 |  |  |  | 207,830 |  |  |  | 935,831 |  |  |  | 1,499,938 |
Additions |  |  | - |  |  |  | 290 |  |  |  | 332 |  |  |  | - |  |  |  | 37 |  |  |  | 43 |  |  |  | 159 |  |  |  | - |  |  |  | 492 |  |  |  | - |  |  |  | 314,236 |  |  |  | 6,077 |  |  |  | 321,666 |
Disposals |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (2 | ) |  |  | - |  |  |  | - |  |  |  | (17 | ) |  |  | (19 | )
Depreciation expense |  |  | - |  |  |  | (32,547 | ) |  |  | (8,013 | ) |  |  | (1,220 | ) |  |  | (1,144 | ) |  |  | (161 | ) |  |  | (426 | ) |  |  | (7,033 | ) |  |  | (1,158 | ) |  |  | (1,676 | ) |  |  | - |  |  |  | (142,866 | ) |  |  | (196,244 | )
Impairment |  |  | - |  |  |  | (49 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (49 | )
Increase (decrease) in foreign currency translation difference |  |  | (35 | ) |  |  | (44 | ) |  |  | (1 | ) |  |  | (1 | ) |  |  | (2 | ) |  |  | (2 | ) |  |  | - |  |  |  | - |  |  |  | (1 | ) |  |  | - |  |  |  | - |  |  |  | (38 | ) |  |  | (124 | )
Reclassifications |  |  | 132 |  |  |  | 18,533 |  |  |  | 12,450 |  |  |  | 478 |  |  |  | 751 |  |  |  | - |  |  |  | 90 |  |  |  | 16,901 |  |  |  | 1,284 |  |  |  | 1,565 |  |  |  | (140,104 | ) |  |  | 87,881 |  |  |  | (39 | )
Other increases (decreases ) (1) |  |  | - |  |  |  | (155 | ) |  |  | (339 | ) |  |  | - |  |  |  | 215 |  |  |  | 27 |  |  |  | 148 |  |  |  | 1,805 |  |  |  | (1,236 | ) |  |  | (8 | ) |  |  | (6,646 | ) |  |  | (9,542 | ) |  |  | (15,731 | )
Decreases for classification as held for sale (2) |  |  | (1,172 | ) |  |  | (1,156 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (2,328 | )
Total changes |  |  | (1,075 | ) |  |  | (15,128 | ) |  |  | 4,429 |  |  |  | (743 | ) |  |  | (143 | ) |  |  | (93 | ) |  |  | (29 | ) |  |  | 11,673 |  |  |  | (621 | ) |  |  | (119 | ) |  |  | 167,486 |  |  |  | (58,505 | ) |  |  | 107,132 |
Closing balance |  |  | 23,620 |  |  |  | 252,969 |  |  |  | 32,604 |  |  |  | 6,042 |  |  |  | 4,579 |  |  |  | 420 |  |  |  | 663 |  |  |  | 23,174 |  |  |  | 4,359 |  |  |  | 5,998 |  |  |  | 375,316 |  |  |  | 877,326 |  |  |  | 1,607,070 |
(1) The net balance of “Other Increases (Decreases)” corresponds to all those items that are reclassified to or from “Property, Plant and Equipment”, They can have the following origin: (i) work in progress which is expensed to profit or loss, forming part of operating costs or other expenses per function, as appropriate; (ii) the variation representing the purchase and use of materials and spare parts; (iii) projects corresponding mainly to exploration expenditures and ground studies that are reclassified to the item other non-current financial assets; (iv) software that is reclassified to “Intangibles”. (2) The Company classifies as non-current held for sale property, plant and equipment (disposal group) that, at the closing date of the financial statements, is subject to a commitment for sale or where the sales process has been initiated and where the sale is expected to occur within twelve months of that date, is classified by the Company as non-current assets held for sale. These assets or disposal groups are valued at the lower of carrying amount or the estimated sales value less the costs to sell and stop being amortized from the moment they are classified as non-current assets held for sale.
Reconciliation of changes in property, plant and equipment by class as of December 31, 2018, gross amount |  | Land |  |  | Buildings |  |  | Other property, plant and equipment |  |  | Transport equipment |  |  | Supplies and accessories |  |  | Equipment office |  |  | Network and communication equipment |  |  | Mining assets |  |  | IT equipment |  |  | Energy generating assets |  |  | Assets under construction |  |  | Machinery, plant and equipment |  |  | Property, plant and equipment |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Opening balance |  |  | 24,900 |  |  |  | 610,264 |  |  |  | 244,831 |  |  |  | 11,195 |  |  |  | 19,498 |  |  |  | 11,105 |  |  |  | 7,356 |  |  |  | 129,028 |  |  |  | 27,038 |  |  |  | 36,643 |  |  |  | 165,054 |  |  |  | 2,938,287 |  |  |  | 4,225,199 |
Additions |  |  | - |  |  |  | 28 |  |  |  | 833 |  |  |  | - |  |  |  | 41 |  |  |  | 15 |  |  |  | - |  |  |  | - |  |  |  | 489 |  |  |  | - |  |  |  | 263,290 |  |  |  | 1,448 |  |  |  | 266,144 |
Disposals |  |  | - |  |  |  | (38 | ) |  |  | (7,811 | ) |  |  | (51 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (10 | ) |  |  | - |  |  |  | (6,582 | ) |  |  | (1,666 | ) |  |  | (16,158 | )
Increase (decrease) in foreign currency translation difference |  |  | (64 | ) |  |  | (134 | ) |  |  | (8 | ) |  |  | (3 | ) |  |  | (19 | ) |  |  | (6 | ) |  |  | - |  |  |  | - |  |  |  | (11 | ) |  |  | - |  |  |  | - |  |  |  | (153 | ) |  |  | (398 | )
Reclassifications |  |  | - |  |  |  | 38,746 |  |  |  | 10,330 |  |  |  | 529 |  |  |  | 4,889 |  |  |  | 268 |  |  |  | 150 |  |  |  | 3,281 |  |  |  | 2,100 |  |  |  | 75 |  |  |  | (184,095 | ) |  |  | 123,726 |  |  |  | (1 | )
Other increases (decreases) |  |  | - |  |  |  | (147 | ) |  |  | (2,444 | ) |  |  | (2 | ) |  |  | 47 |  |  |  | (5 | ) |  |  | (1 | ) |  |  | - |  |  |  | 349 |  |  |  | 212 |  |  |  | (29,837 | ) |  |  | 7,220 |  |  |  | (24,608 | )
Decreases for classification as held for sale |  |  | (141 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (141 | )
Total changes |  |  | (205 | ) |  |  | 38,455 |  |  |  | 900 |  |  |  | 473 |  |  |  | 4,958 |  |  |  | 272 |  |  |  | 149 |  |  |  | 3,281 |  |  |  | 2,917 |  |  |  | 287 |  |  |  | 42,776 |  |  |  | 130,575 |  |  |  | 224,838 |
Closing balance |  |  | 24,695 |  |  |  | 648,719 |  |  |  | 245,731 |  |  |  | 11,668 |  |  |  | 24,456 |  |  |  | 11,377 |  |  |  | 7,505 |  |  |  | 132,309 |  |  |  | 29,955 |  |  |  | 36,930 |  |  |  | 207,830 |  |  |  | 3,068,862 |  |  |  | 4,450,037 |
Reconciliation of changes in property, plant and equipment by class as of December 31, 2018, accumulated depreciation |  | Land |  |  | Buildings |  |  | Other property, plant and equipment |  |  | Transport equipment |  |  | Supplies and accessories |  |  | Equipment office |  |  | Network and communication equipment |  |  | Mining assets |  |  | IT equipment |  |  | Energy generating assets |  |  | Assets under construction |  |  | Machinery, plant and equipment |  |  | Property, plant and equipment |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Opening balance |  |  | - |  |  |  | (379,945 | ) |  |  | (219,969 | ) |  |  | (7,938 | ) |  |  | (17,626 | ) |  |  | (10,618 | ) |  |  | (6,306 | ) |  |  | (112,791 | ) |  |  | (23,637 | ) |  |  | (28,782 | ) |  |  | - |  |  |  | (1,988,233 | ) |  |  | (2,795,845 | )
Disposals |  |  | - |  |  |  | 38 |  |  |  | 7,737 |  |  |  | 8 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 10 |  |  |  | - |  |  |  | - |  |  |  | 1,722 |  |  |  | 9,515 |
Depreciation expense |  |  | - |  |  |  | (29,829 | ) |  |  | (7,415 | ) |  |  | (880 | ) |  |  | (2,056 | ) |  |  | (271 | ) |  |  | (483 | ) |  |  | (8,017 | ) |  |  | (1,374 | ) |  |  | (2,026 | ) |  |  | - |  |  |  | (158,900 | ) |  |  | (211,251 | )
Impairment |  |  | - |  |  |  | (437 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (12 | ) |  |  | - |  |  |  | (941 | ) |  |  | (1,390 | )
Increase (decrease) in foreign currency translation difference |  |  | - |  |  |  | 41 |  |  |  | 4 |  |  |  | 1 |  |  |  | 12 |  |  |  | 3 |  |  |  | - |  |  |  | - |  |  |  | (1 | ) |  |  | - |  |  |  | - |  |  |  | 61 |  |  |  | 121 |
Reclassifications |  |  | - |  |  |  | 106 |  |  |  | (483 | ) |  |  | - |  |  |  | (87 | ) |  |  | (17 | ) |  |  | (28 | ) |  |  | - |  |  |  | 90 |  |  |  | 1 |  |  |  | - |  |  |  | 419 |  |  |  | 1 |
Other increases (decreases) |  |  | - |  |  |  | 115 |  |  |  | 2,570 |  |  |  | 33 |  |  |  | 23 |  |  |  | 39 |  |  |  | 4 |  |  |  | - |  |  |  | (63 | ) |  |  | 6 |  |  |  | - |  |  |  | 908 |  |  |  | 3,635 |
Total changes |  |  | - |  |  |  | (29,966 | ) |  |  | 2,413 |  |  |  | (838 | ) |  |  | (2,108 | ) |  |  | (246 | ) |  |  | (507 | ) |  |  | (8,017 | ) |  |  | (1,338 | ) |  |  | (2,031 | ) |  |  | - |  |  |  | (156,731 | ) |  |  | (199,369 | )
Closing balance |  |  | - |  |  |  | (409,911 | ) |  |  | (217,556 | ) |  |  | (8,776 | ) |  |  | (19,734 | ) |  |  | (10,864 | ) |  |  | (6,813 | ) |  |  | (120,808 | ) |  |  | (24,975 | ) |  |  | (30,813 | ) |  |  | - |  |  |  | (2,144,964 | ) |  |  | (2,995,214 | )
Reconciliation of changes in property, plant and equipment by class as of December 31, 2018, net amount |  | Land |  |  | Buildings |  |  | Other property, plant and equipment |  |  | Transport equipment |  |  | Supplies and accessories |  |  | Equipment office |  |  | Network and communication equipment |  |  | Mining assets |  |  | IT equipment |  |  | Energy generating assets |  |  | Assets under construction |  |  | Machinery, plant and equipment |  |  | Property, plant and equipment |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Opening balance |  |  | 24,900 |  |  |  | 230,319 |  |  |  | 24,862 |  |  |  | 3,257 |  |  |  | 1,872 |  |  |  | 487 |  |  |  | 1,050 |  |  |  | 16,237 |  |  |  | 3,401 |  |  |  | 7,861 |  |  |  | 165,054 |  |  |  | 950,054 |  |  |  | 1,429,354 |
Changes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additions |  |  | - |  |  |  | 28 |  |  |  | 833 |  |  |  | - |  |  |  | 41 |  |  |  | 15 |  |  |  | - |  |  |  | - |  |  |  | 489 |  |  |  | - |  |  |  | 263,290 |  |  |  | 1,448 |  |  |  | 266,144 |
Disposals |  |  | - |  |  |  | - |  |  |  | (74 | ) |  |  | (43 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (6,582 | ) |  |  | 56 |  |  |  | (6,643 | )
Depreciation expense |  |  | - |  |  |  | (29,829 | ) |  |  | (7,415 | ) |  |  | (880 | ) |  |  | (2,056 | ) |  |  | (271 | ) |  |  | (483 | ) |  |  | (8,017 | ) |  |  | (1,374 | ) |  |  | (2,026 | ) |  |  | - |  |  |  | (158,900 | ) |  |  | (211,251 | )
Impairment |  |  | - |  |  |  | (437 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (12 | ) |  |  | - |  |  |  | (941 | ) |  |  | (1,390 | )
Increase (decrease) in foreign currency translation difference |  |  | (64 | ) |  |  | (93 | ) |  |  | (4 | ) |  |  | (2 | ) |  |  | (7 | ) |  |  | (3 | ) |  |  | - |  |  |  | - |  |  |  | (12 | ) |  |  | - |  |  |  | - |  |  |  | (92 | ) |  |  | (277 | )
Reclassifications |  |  | - |  |  |  | 38,852 |  |  |  | 9,847 |  |  |  | 529 |  |  |  | 4,802 |  |  |  | 251 |  |  |  | 122 |  |  |  | 3,281 |  |  |  | 2,190 |  |  |  | 76 |  |  |  | (184,095 | ) |  |  | 124,145 |  |  |  | - |
Other increases (decreases ) (1) |  |  | - |  |  |  | (32 | ) |  |  | 126 |  |  |  | 31 |  |  |  | 70 |  |  |  | 34 |  |  |  | 3 |  |  |  | - |  |  |  | 286 |  |  |  | 218 |  |  |  | (29,837 | ) |  |  | 8,128 |  |  |  | (20,973 | )
Decreases for classification as held for sale (2) |  |  | (141 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (141 | )
Total changes |  |  | (205 | ) |  |  | 8,489 |  |  |  | 3,313 |  |  |  | (365 | ) |  |  | 2,850 |  |  |  | 26 |  |  |  | (358 | ) |  |  | (4,736 | ) |  |  | 1,579 |  |  |  | (1,744 | ) |  |  | 42,776 |  |  |  | (26,156 | ) |  |  | 25,469 |
Closing balance |  |  | 24,695 |  |  |  | 238,808 |  |  |  | 28,175 |  |  |  | 2,892 |  |  |  | 4,722 |  |  |  | 513 |  |  |  | 692 |  |  |  | 11,501 |  |  |  | 4,980 |  |  |  | 6,117 |  |  |  | 207,830 |  |  |  | 923,898 |  |  |  | 1,454,823 |
(1) The net balance of “Other increases (Decreases)” corresponds to all those items that are reclassified to or from property, plant and equipment, They can have the following origin: (i) work in progress which is expensed to profit or loss, forming part of operating costs or other expenses per function, as appropriate;, (ii) the variation representing the purchase and use of materials and spare parts; (iii) projects corresponding mainly to exploration expenditures and ground studies that are reclassified to the item other non-current financial assets; (iv) assets for retirement obligations and (v) software that is reclassified to Intangibles. (2) The Company classifies as non-current held for sale property, plant and equipment (disposal group) that, at the closing date of the financial statements, is subject to a commitment for sale or where the sales process has been initiated and where the sale is expected to occur within twelve months of that date, is classified by the Company as non-current assets held for sale. These assets or disposal groups are valued at the lower of carrying amount or the estimated sales value less the costs to sell and stop being amortized from the moment they are classified as non-current assets held for sale. 15.3 Reconciliation of changes in right of use assets, by classes
Re c onciliation of changes in property, plant and equipment by class as of December 31, 2019, net amount |  | Land |  |  | Buildings |  |  | Other property, plant and equipment |  |  | Transport equipment |  |  | Supplies and accessories |  |  | Equipment office |  |  | Network and communication equipment |  |  | Mining assets |  |  | IT equipment |  |  | Energy generating assets |  |  | Assets under construction |  |  | Machinery, plant and equipment |  |  | Property, plant and equipment |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Opening balance |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Initial recognition of IFRS 16 |  |  | - |  |  |  | 29,289 |  |  |  | - |  |  |  | 3,893 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 11,933 |  |  |  | 45,115 |
Balance with recognition of IFRS 16 |  |  | - |  |  |  | 29,289 |  |  |  | - |  |  |  | 3,893 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 11,933 |  |  |  | 45,115 |
Depreciation expense |  |  | - |  |  |  | (3,547 | ) |  |  | - |  |  |  | (537 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (3,867 | ) |  |  | (7,951 | )
Impairment |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Other increases (decreases) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Total changes |  |  | - |  |  |  | (3,547 | ) |  |  | - |  |  |  | (537 | ) |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | (3,867 | ) |  |  | (7,951 | )
Closing balance |  |  | - |  |  |  | 25,742 |  |  |  | - |  |  |  | 3,356 |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 8,066 |  |  |  | 37,164 |
The Company’s lease activities included the following aspects:
| (a) | The nature of the Company’s lease activities is related to contracts focused primarily on business operations, notably rights-of-use to equipment and real estate.
| (b) | The Company does not estimate any significant future cash outflows that would potentially expose the Company, and these are likewise not reflected in the measurement of lease liabilities, related to concepts such as (i) variable lease payments, (ii) expansion options and termination options, (iii) guaranteed residual value and (iv) leases not yet undertaken but committed by the Company.
| (c) | These are not subject to restrictions or agreements imposed by contracts.
| (d) | There were no sales lease back in the period.
15.4 Detail of property, plant and equipment pledged as guarantee There are no restrictions in title or guarantees for compliance with obligations that affect property, plant and equipment. 15.5 Impairment of assets As indicated in Note 3.16 to the financial statements, the recoverable amount of property, plant and equipment is measured whenever there is an indication that the asset could be impaired. For the years ended December 31, 2019, 2018 and 2017, the Company recognized impairment losses amounting ThUS$ 49, ThUS$ 1,390 and ThUS$5,205, respectively. 15.6 Additional Information As of December 31, 2019, capitalized interest as part of a s sets under construction is presented in Note 28.

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