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Gains (losses) from operating activities in the statement of income, included according to their nature (Details 8) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statement [Line Items] |  |  |  |
Raw materials and consumables |  | $ (271,912) | $ (260,869) | $ (227,617)
Classes of Employee Benefit Expenses |  |  |  |
Personnel expenses |  | (238,748) | (260,869) | (227,617)
Depreciation and amortization expense |  |  |  |
Depreciation expense |  | (188,157) | (212,641) | (232,455)
Depreciation of Right-of-use Assets (IFRS 16) |  | (5,450) | 0 | 0
Property, plant and equipment |  | (49) | (1,390) | (5,205)
Goodwill |  | (140) | (3,254) |
Non-current assets and disowned groups held for sale |  | (607) |  |
Amortization expense |  | (6,020) | (6,376) | (7,490)
Investment plan expenses |  | (18,367) | (11,860) | (14,796)
Non-metallic exploration expenses |  | (5,537) | (5,864) | (5,322)
Provision for site closure |  | (911) | (2,045) | (2,960)
Provision for materials, spare parts and supplies |  | (7,500) | 1,721 | 1,746
Contractors |  | (127,970) | (126,653) | (123,415)
Leases |  | (50,660) | (41,801) | (40,430)
Mining concessions |  | (7,856) | (8,168) | (7,802)
Operation transport |  | (56,376) | (64,352) | (69,051)
Freight and product transport costs |  | 46,264 | 51,387 | 55,383
Purchase of products from third parties |  | 189,583 | 182,695 | 184,226
CORFO rights |  | (143,861) | (182,954) | 46,274
Export costs |  | 97,103 | 107,418 | 86,831
Expenses related to Variable Parts Leases (IFRS 16) |  | (1,096) | 0 | 0
Insurance |  | (16,968) | (11,923) | (10,255)
Variation in inventory |  | 7,500 | (1,721) | (1,746)
Variation in provision on product inventory |  | 17,107 | (8,997) | (14,989)
Other expenses, by nature |  | (85,284) | (34,525) | (70,133)
Total |  | (1,526,778) | (1,640,664) | (1,549,594)
Other expenses by nature [Member] |  |  |  |
Depreciation and amortization expense |  |  |  |
Legal expenses |  | (9,277) | (15,139) | $ (25,176)
Provision for materials, spare parts and supplies | $ 76,009 | (52,557) | (20,597) |
Purchase of products from third parties | (184,226) | (189,583) | (182,695) |
Export costs | (86,831) | (97,103) | (107,418) |
Restructuring of joint ventures | (6,000) |  | 6,000 |
Consultant and advisor services | (14,348) | (13,862) | (12,848) |
Variation in inventory | $ (76,009) | $ 52,557 | $ 20,597 |

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- Definition The amount of depreciation expense. Depreciation is the systematic allocation of depreciable amounts of tangible assets over their useful lives. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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