XML 171 R148.htm IDEA: XBRL DOCUMENT
v3.19.1

Property, plant and equipment (Details 1) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | $ 1,429,354 |  | $ 1,532,710 |
Changes |  |  |  |  |
Additions |  | 266,144 |  | 161,800 |
Disposals |  | (6,643) |  | (226) |
Depreciation expense |  | (211,251) |  | (227,160) |
Impairment |  | (1,390) |  | (5,205) |
Increase (decrease) in foreign currency translation difference |  | (277) |  | 160 |
Reclassifications |  | 0 |  | (127) |
Other increases (decreases) |  | (20,973) | [1] | (32,130) | [2]
Decreases for classification as held for sale | [3] | (141) |  | (468) |
Total changes |  | 25,469 |  | (103,356) |
Closing balance |  | 1,454,823 |  | 1,429,354 |
Land [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | 24,900 |  | 32,702 |
Changes |  |  |  |  |
Additions |  | 0 |  | 0 |
Disposals |  | 0 |  | 0 |
Depreciation expense |  | 0 |  | 0 |
Impairment |  | 0 |  | 0 |
Increase (decrease) in foreign currency translation difference |  | (64) |  | 45 |
Reclassifications |  | 0 |  | 0 |
Other increases (decreases) |  | 0 | [1] | (7,436) | [2]
Decreases for classification as held for sale | [3] | (141) |  | (411) |
Total changes |  | (205) |  | (7,802) |
Closing balance |  | 24,695 |  | 24,900 |
Buildings [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | 230,319 |  | 237,585 |
Changes |  |  |  |  |
Additions |  | 28 |  | 189 |
Disposals |  | 0 |  | (1) |
Depreciation expense |  | (29,829) |  | (33,306) |
Impairment |  | (437) |  | 0 |
Increase (decrease) in foreign currency translation difference |  | (93) |  | 68 |
Reclassifications |  | 38,852 |  | 23,274 |
Other increases (decreases) |  | (32) | [1] | 2,567 | [2]
Decreases for classification as held for sale | [3] | 0 |  | (57) |
Total changes |  | 8,489 |  | (7,266) |
Closing balance |  | 238,808 |  | 230,319 |
Other property, plant and equipment [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | 24,862 |  | 26,417 |
Changes |  |  |  |  |
Additions |  | 833 |  | 541 |
Disposals |  | (74) |  | (1) |
Depreciation expense |  | (7,415) |  | (6,759) |
Impairment |  | 0 |  | 0 |
Increase (decrease) in foreign currency translation difference |  | (4) |  | 0 |
Reclassifications |  | 9,847 |  | 8,293 |
Other increases (decreases) |  | 126 | [1] | (3,629) | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | 3,313 |  | (1,555) |
Closing balance |  | 28,175 |  | 24,862 |
Transport equipment [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | 3,257 |  | 3,355 |
Changes |  |  |  |  |
Additions |  | 0 |  | 0 |
Disposals |  | (43) |  | (9) |
Depreciation expense |  | (880) |  | (730) |
Impairment |  | 0 |  | 0 |
Increase (decrease) in foreign currency translation difference |  | (2) |  | (1) |
Reclassifications |  | 529 |  | 664 |
Other increases (decreases) |  | 31 | [1] | (22) | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | (365) |  | (98) |
Closing balance |  | 2,892 |  | 3,257 |
Supplies and accessoies [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | 1,872 |  | 1,773 |
Changes |  |  |  |  |
Additions |  | 41 |  | 115 |
Disposals |  | 0 |  | 0 |
Depreciation expense |  | (2,056) |  | (1,047) |
Impairment |  | 0 |  | 0 |
Increase (decrease) in foreign currency translation difference |  | (7) |  | 0 |
Reclassifications |  | 4,802 |  | 934 |
Other increases (decreases) |  | 70 | [1] | 97 | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | 2,850 |  | 99 |
Closing balance |  | 4,722 |  | 1,872 |
Equipment Office [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | 487 |  | 3,642 |
Changes |  |  |  |  |
Additions |  | 15 |  | 42 |
Disposals |  | 0 |  | (20) |
Depreciation expense |  | (271) |  | (357) |
Impairment |  | 0 |  | 0 |
Increase (decrease) in foreign currency translation difference |  | (3) |  | 0 |
Reclassifications |  | 251 |  | 103 |
Other increases (decreases) |  | 34 | [1] | (2,923) | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | 26 |  | (3,155) |
Closing balance |  | 513 |  | 487 |
Network and communication equipment |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | 1,050 |  | 1,686 |
Changes |  |  |  |  |
Additions |  | 0 |  | 12 |
Disposals |  | 0 |  | 0 |
Depreciation expense |  | (483) |  | (665) |
Impairment |  | 0 |  | 0 |
Increase (decrease) in foreign currency translation difference |  | 0 |  | 0 |
Reclassifications |  | 122 |  | 98 |
Other increases (decreases) |  | 3 | [1] | (81) | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | (358) |  | (636) |
Closing balance |  | 692 |  | 1,050 |
Mining assets [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | 16,237 |  | 24,643 |
Changes |  |  |  |  |
Additions |  | 0 |  | 0 |
Disposals |  | 0 |  |  |
Disposals |  |  |  | 1 |
Depreciation expense |  | (8,017) |  | (10,638) |
Impairment |  | 0 |  | 0 |
Increase (decrease) in foreign currency translation difference |  | 0 |  | 0 |
Reclassifications |  | 3,281 |  | 596 |
Other increases (decreases) |  | 0 | [1] | 1,635 | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | (4,736) |  | (8,406) |
Closing balance |  | 11,501 |  | 16,237 |
Network infrastructure [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | 3,401 |  | 366 |
Changes |  |  |  |  |
Additions |  | 489 |  | 899 |
Disposals |  | 0 |  | (32) |
Depreciation expense |  | (1,374) |  | (909) |
Impairment |  | 0 |  | 0 |
Increase (decrease) in foreign currency translation difference |  | (12) |  | (13) |
Reclassifications |  | 2,190 |  | 76 |
Other increases (decreases) |  | 286 | [1] | 3,014 | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | 1,579 |  | 3,035 |
Closing balance |  | 4,980 |  | 3,401 |
Power generating assets [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | 7,861 |  | 8,191 |
Changes |  |  |  |  |
Additions |  | 0 |  | 122 |
Disposals |  | 0 |  | 0 |
Depreciation expense |  | (2,026) |  | (2,184) |
Impairment |  | (12) |  | 0 |
Increase (decrease) in foreign currency translation difference |  | 0 |  | 0 |
Reclassifications |  | 76 |  | 1,735 |
Other increases (decreases) |  | 218 | [1] | (3) | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | (1,744) |  | (330) |
Closing balance |  | 6,117 |  | 7,861 |
Construction in Progress [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | 165,054 |  | 170,710 |
Changes |  |  |  |  |
Additions |  | 263,290 |  | 149,133 |
Disposals |  | (6,582) |  | 0 |
Depreciation expense |  | 0 |  | 0 |
Impairment |  | 0 |  | 0 |
Increase (decrease) in foreign currency translation difference |  | 0 |  | 1 |
Reclassifications |  | (184,095) |  | (135,988) |
Other increases (decreases) |  | (29,837) | [1] | (18,802) | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | 42,776 |  | (5,656) |
Closing balance |  | 207,830 |  | 165,054 |
Machinery, plant and equipment |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | 950,054 |  | 1,021,640 |
Changes |  |  |  |  |
Additions |  | 1,448 |  | 10,747 |
Disposals |  |  |  | (164) |
Disposals |  | 56 |  |  |
Depreciation expense |  | (158,900) |  | (170,565) |
Impairment |  | (941) |  | (5,205) |
Increase (decrease) in foreign currency translation difference |  | (92) |  | 60 |
Reclassifications |  | 124,145 |  | 100,088 |
Other increases (decreases) |  | 8,128 | [1] | (6,547) | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | (26,156) |  | (71,586) |
Closing balance |  | 923,898 |  | 950,054 |
Gross carrying amount [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | 4,225,199 |  | 4,140,841 |
Changes |  |  |  |  |
Additions |  | 266,144 |  | 161,800 |
Disposals |  | (16,158) |  | (45,539) |
Increase (decrease) in foreign currency translation difference |  | (398) |  | 269 |
Reclassifications |  | (1) |  | (191) |
Other increases (decreases) |  | (24,608) | [1] | (31,514) | [2]
Decreases for classification as held for sale | [3] | (141) |  | (467) |
Total changes |  | 224,838 |  | 84,358 |
Closing balance |  | 4,450,037 |  | 4,225,199 |
Gross carrying amount [member] | Land [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | 24,900 |  | 32,702 |
Changes |  |  |  |  |
Additions |  | 0 |  | 0 |
Disposals |  | 0 |  | 0 |
Increase (decrease) in foreign currency translation difference |  | (64) |  | 45 |
Reclassifications |  | 0 |  | 0 |
Other increases (decreases) |  | 0 | [1] | (7,436) | [2]
Decreases for classification as held for sale | [3] | (141) |  | (411) |
Total changes |  | (205) |  | (7,802) |
Closing balance |  | 24,695 |  | 24,900 |
Gross carrying amount [member] | Buildings [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | 610,264 |  | 582,082 |
Changes |  |  |  |  |
Additions |  | 28 |  | 189 |
Disposals |  | (38) |  | (59) |
Increase (decrease) in foreign currency translation difference |  | (134) |  | 103 |
Reclassifications |  | 38,746 |  | 23,336 |
Other increases (decreases) |  | (147) | [1] | 4,669 | [2]
Decreases for classification as held for sale | [3] | 0 |  | (56) |
Total changes |  | 38,455 |  | 28,182 |
Closing balance |  | 648,719 |  | 610,264 |
Gross carrying amount [member] | Other property, plant and equipment [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | 244,831 |  | 253,555 |
Changes |  |  |  |  |
Additions |  | 833 |  | 541 |
Disposals |  | (7,811) |  | (11,623) |
Increase (decrease) in foreign currency translation difference |  | (8) |  | 3 |
Reclassifications |  | 10,330 |  | 8,255 |
Other increases (decreases) |  | (2,444) | [1] | (5,900) | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | 900 |  | (8,724) |
Closing balance |  | 245,731 |  | 244,831 |
Gross carrying amount [member] | Transport equipment [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | 11,195 |  | 10,819 |
Changes |  |  |  |  |
Additions |  | 0 |  | 0 |
Disposals |  | (51) |  | (321) |
Increase (decrease) in foreign currency translation difference |  | (3) |  | 1 |
Reclassifications |  | 529 |  | 696 |
Other increases (decreases) |  | (2) | [1] | 0 | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | 473 |  | 376 |
Closing balance |  | 11,668 |  | 11,195 |
Gross carrying amount [member] | Supplies and accessoies [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | 19,498 |  | 18,259 |
Changes |  |  |  |  |
Additions |  | 41 |  | 115 |
Disposals |  | 0 |  | 0 |
Increase (decrease) in foreign currency translation difference |  | (19) |  | 0 |
Reclassifications |  | 4,889 |  | 1,044 |
Other increases (decreases) |  | 47 | [1] | 80 | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | 4,958 |  | 1,239 |
Closing balance |  | 24,456 |  | 19,498 |
Gross carrying amount [member] | Equipment Office [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | 11,105 |  | 17,731 |
Changes |  |  |  |  |
Additions |  | 15 |  | 42 |
Disposals |  | 0 |  | (23) |
Increase (decrease) in foreign currency translation difference |  | (6) |  | 0 |
Reclassifications |  | 268 |  | 172 |
Other increases (decreases) |  | (5) | [1] | (6,817) | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | 272 |  | (6,626) |
Closing balance |  | 11,377 |  | 11,105 |
Gross carrying amount [member] | Network and communication equipment |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | 7,356 |  | 7,522 |
Changes |  |  |  |  |
Additions |  | 0 |  | 12 |
Disposals |  | 0 |  | 0 |
Increase (decrease) in foreign currency translation difference |  | 0 |  | 0 |
Reclassifications |  | 150 |  | 123 |
Other increases (decreases) |  | (1) | [1] | (301) | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | 149 |  | (166) |
Closing balance |  | 7,505 |  | 7,356 |
Gross carrying amount [member] | Mining assets [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | 129,028 |  | 158,514 |
Changes |  |  |  |  |
Additions |  | 0 |  | 0 |
Disposals |  | 0 |  | (30,082) |
Increase (decrease) in foreign currency translation difference |  | 0 |  | 0 |
Reclassifications |  | 3,281 |  | 596 |
Other increases (decreases) |  | 0 | [1] | 0 | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | 3,281 |  | (29,486) |
Closing balance |  | 132,309 |  | 129,028 |
Gross carrying amount [member] | Network infrastructure [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | 27,038 |  | 20,316 |
Changes |  |  |  |  |
Additions |  | 489 |  | 899 |
Disposals |  | (10) |  | (57) |
Increase (decrease) in foreign currency translation difference |  | (11) |  | (2) |
Reclassifications |  | 2,100 |  | 122 |
Other increases (decreases) |  | 349 | [1] | 5,760 | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | 2,917 |  | 6,722 |
Closing balance |  | 29,955 |  | 27,038 |
Gross carrying amount [member] | Power generating assets [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | 36,643 |  | 34,812 |
Changes |  |  |  |  |
Additions |  | 0 |  | 122 |
Disposals |  | 0 |  | 0 |
Increase (decrease) in foreign currency translation difference |  | 0 |  | 0 |
Reclassifications |  | 75 |  | 1,709 |
Other increases (decreases) |  | 212 | [1] | 0 | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | 287 |  | 1,831 |
Closing balance |  | 36,930 |  | 36,643 |
Gross carrying amount [member] | Construction in Progress [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | 165,054 |  | 170,710 |
Changes |  |  |  |  |
Additions |  | 263,290 |  | 149,133 |
Disposals |  | (6,582) |  | 0 |
Increase (decrease) in foreign currency translation difference |  | 0 |  | 1 |
Reclassifications |  | (184,095) |  | (135,988) |
Other increases (decreases) |  | (29,837) | [1] | (18,802) | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | 42,776 |  | (5,656) |
Closing balance |  | 207,830 |  | 165,054 |
Gross carrying amount [member] | Machinery, plant and equipment |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | 2,938,287 |  | 2,833,819 |
Changes |  |  |  |  |
Additions |  | 1,448 |  | 10,747 |
Disposals |  | (1,666) |  | (3,374) |
Increase (decrease) in foreign currency translation difference |  | (153) |  | 118 |
Reclassifications |  | 123,726 |  | 99,744 |
Other increases (decreases) |  | 7,220 | [1] | (2,767) | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | 130,575 |  | 104,468 |
Closing balance |  | 3,068,862 |  | 2,938,287 |
Accumulated depreciation and amortisation [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | (2,795,845) |  | (2,608,131) |
Changes |  |  |  |  |
Disposals |  | 9,515 |  | 45,313 |
Depreciation expense |  | (211,251) |  | (227,160) |
Impairment |  | (1,390) |  | (5,205) |
Increase (decrease) in foreign currency translation difference |  | 121 |  |  |
Reclassifications |  | 1 |  | 64 |
Other increases (decreases) |  | 3,635 | [1] | (616) | [2]
Decreases for classification as held for sale | [3] | 0 |  | (1) |
Total changes |  | (199,369) |  | (187,714) |
Closing balance |  | (2,995,214) |  | (2,795,845) |
Accumulated depreciation and amortisation [member] | Land [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | 0 |  | 0 |
Changes |  |  |  |  |
Disposals |  | 0 |  | 0 |
Depreciation expense |  | 0 |  | 0 |
Impairment |  | 0 |  | 0 |
Increase (decrease) in foreign currency translation difference |  | 0 |  | 0 |
Reclassifications |  | 0 |  | 0 |
Other increases (decreases) |  | 0 | [1] | 0 | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | 0 |  | 0 |
Closing balance |  | 0 |  | 0 |
Accumulated depreciation and amortisation [member] | Buildings [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | (379,945) |  | (344,497) |
Changes |  |  |  |  |
Disposals |  | 38 |  | 58 |
Depreciation expense |  | (29,829) |  | (33,306) |
Impairment |  | (437) |  | 0 |
Increase (decrease) in foreign currency translation difference |  | 41 |  | 0 |
Reclassifications |  | 106 |  | (62) |
Other increases (decreases) |  | 115 | [1] | (2,102) | [2]
Decreases for classification as held for sale | [3] | 0 |  | (1) |
Total changes |  | (29,966) |  | (35,448) |
Closing balance |  | (409,911) |  | (379,945) |
Accumulated depreciation and amortisation [member] | Other property, plant and equipment [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | (219,969) |  | (227,138) |
Changes |  |  |  |  |
Disposals |  | 7,737 |  | 11,622 |
Depreciation expense |  | (7,415) |  | (6,759) |
Impairment |  | 0 |  | 0 |
Increase (decrease) in foreign currency translation difference |  | 4 |  |  |
Reclassifications |  | (483) |  | 38 |
Other increases (decreases) |  | 2,570 | [1] | 2,271 | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | 2,413 |  | 7,169 |
Closing balance |  | (217,556) |  | (219,969) |
Accumulated depreciation and amortisation [member] | Transport equipment [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | (7,938) |  | (7,464) |
Changes |  |  |  |  |
Disposals |  | 8 |  | 312 |
Depreciation expense |  | (880) |  | (730) |
Impairment |  | 0 |  | 0 |
Increase (decrease) in foreign currency translation difference |  | 1 |  |  |
Reclassifications |  | 0 |  | (32) |
Other increases (decreases) |  | 33 | [1] | (22) | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | (838) |  | (474) |
Closing balance |  | (8,776) |  | (7,938) |
Accumulated depreciation and amortisation [member] | Supplies and accessoies [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | (17,626) |  | (16,486) |
Changes |  |  |  |  |
Disposals |  | 0 |  | 0 |
Depreciation expense |  | (2,056) |  | (1,047) |
Impairment |  | 0 |  | 0 |
Increase (decrease) in foreign currency translation difference |  | 12 |  |  |
Reclassifications |  | (87) |  | (110) |
Other increases (decreases) |  | 23 | [1] | 17 | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | (2,108) |  | (1,140) |
Closing balance |  | (19,734) |  | (17,626) |
Accumulated depreciation and amortisation [member] | Equipment Office [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | (10,618) |  | (14,089) |
Changes |  |  |  |  |
Disposals |  | 0 |  | 3 |
Depreciation expense |  | (271) |  | (357) |
Impairment |  | 0 |  | 0 |
Increase (decrease) in foreign currency translation difference |  | 3 |  |  |
Reclassifications |  | (17) |  | (69) |
Other increases (decreases) |  | 39 | [1] | 3,894 | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | (246) |  | 3,471 |
Closing balance |  | (10,864) |  | (10,618) |
Accumulated depreciation and amortisation [member] | Network and communication equipment |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | (6,306) |  | (5,836) |
Changes |  |  |  |  |
Disposals |  | 0 |  | 0 |
Depreciation expense |  | (483) |  | (665) |
Impairment |  | 0 |  | 0 |
Increase (decrease) in foreign currency translation difference |  | 0 |  |  |
Reclassifications |  | (28) |  | (25) |
Other increases (decreases) |  | 4 | [1] | 220 | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | (507) |  | (470) |
Closing balance |  | (6,813) |  | (6,306) |
Accumulated depreciation and amortisation [member] | Mining assets [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | (112,791) |  | (133,871) |
Changes |  |  |  |  |
Disposals |  | 0 |  | 30,083 |
Depreciation expense |  | (8,017) |  | (10,638) |
Impairment |  | 0 |  | 0 |
Increase (decrease) in foreign currency translation difference |  | 0 |  |  |
Reclassifications |  | 0 |  | 0 |
Other increases (decreases) |  | 0 | [1] | 1,635 | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | (8,017) |  | 21,080 |
Closing balance |  | (120,808) |  | (112,791) |
Accumulated depreciation and amortisation [member] | Network infrastructure [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | (23,637) |  | (19,950) |
Changes |  |  |  |  |
Disposals |  | 10 |  | 25 |
Depreciation expense |  | (1,374) |  | (909) |
Impairment |  | 0 |  | 0 |
Increase (decrease) in foreign currency translation difference |  | (1) |  |  |
Reclassifications |  | 90 |  | (46) |
Other increases (decreases) |  | (63) | [1] | (2,746) | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | (1,338) |  | (3,687) |
Closing balance |  | (24,975) |  | (23,637) |
Accumulated depreciation and amortisation [member] | Power generating assets [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | (28,782) |  | (26,621) |
Changes |  |  |  |  |
Disposals |  | 0 |  | 0 |
Depreciation expense |  | (2,026) |  | (2,184) |
Impairment |  | (12) |  | 0 |
Increase (decrease) in foreign currency translation difference |  | 0 |  |  |
Reclassifications |  | 1 |  | 26 |
Other increases (decreases) |  | 6 | [1] | (3) | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | (2,031) |  | (2,161) |
Closing balance |  | (30,813) |  | (28,782) |
Accumulated depreciation and amortisation [member] | Construction in Progress [Member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | 0 |  | 0 |
Changes |  |  |  |  |
Disposals |  | 0 |  | 0 |
Depreciation expense |  | 0 |  | 0 |
Impairment |  | 0 |  | 0 |
Increase (decrease) in foreign currency translation difference |  | 0 |  |  |
Reclassifications |  | 0 |  | 0 |
Other increases (decreases) |  | 0 | [1] | 0 | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | 0 |  | 0 |
Closing balance |  | 0 |  | 0 |
Accumulated depreciation and amortisation [member] | Machinery, plant and equipment |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |
Opening balance |  | (1,988,233) |  | (1,812,179) |
Changes |  |  |  |  |
Disposals |  | 1,722 |  | 3,210 |
Depreciation expense |  | (158,900) |  | (170,565) |
Impairment |  | (941) |  | (5,205) |
Increase (decrease) in foreign currency translation difference |  | 61 |  |  |
Reclassifications |  | 419 |  | 344 |
Other increases (decreases) |  | 908 | [1] | (3,780) | [2]
Decreases for classification as held for sale | [3] | 0 |  | 0 |
Total changes |  | (156,731) |  | (176,054) |
Closing balance |  | $ (2,144,964) |  | $ (1,988,233) |
[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:1) work in progress which is expensed to profit or loss, forming part of operating costs or other expenses per function, as appropriate; 2) the variation representing the purchase and use of materials and spare parts; 3) projects corresponding mainly to exploration expenditures and ground studies that are reclassified to the item other non-current financial assets; 4) software that is reclassified to Intangibles.
[2] | 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:1) work in progress which is expensed to profit or loss, forming part of operating costs or other expenses per function, as appropriate; 2) the variation representing the purchase and use of materials and spare parts; 3) projects corresponding mainly to exploration expenditures and ground studies that are reclassified to the item other non-current financial assets; 4) assets for retirement obligations and 5) software that is reclassified to Intangibles.
[3] | Any 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.

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