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Gains (losses) from operating activities in the statement of income by function of expenses, included according to their nature (Details 6) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Depreciation and amortization expense |  |  |  |
Operations transport | $ 32,000 |  |  |
Other expenses by nature [Member] |  |  |  |
Raw materials and consumables |  | $ (413,283) | $ (335,192) | $ (309,103)
Classes of Employee Benefit Expenses |  |  |  |
Personnel expenses |  | (222,843) | (209,552) | (172,228)
Depreciation and amortization expense |  |  |  |
Depreciation expense |  | (232,455) | (271,350) | (305,407)
Amortization expense |  | (2,929) | (3,217) | (3,475)
Ground study amortization expense |  | (5,440) | (9,498) | (2,287)
Inventory provision variation |  | (14,989) | (926) | 2,597
Impairment of doubtful accounts |  | (8,038) | (7,198) | (2,981)
Operating leases |  | (96,094) | (90,325) | (62,599)
Fines paid |  | (1,112) | (1,379) | (3,953)
Fines from SEC and the Justice department |  | 0 | (30,488) | 0
Investment plan expenses |  | (23,962) | (23,281) | (33,820)
Maintenance and repair |  | (5,306) | (6,051) | (3,956)
Plant suspension expenses |  | 0 | (32,061) | (57,665)
Contractors |  | (67,337) | (62,300) | (49,862)
Mining concessions |  | (7,802) | (7,313) | (12,888)
Operations transport |  | (54,057) | (45,864) | (37,809)
Freight and product transport costs |  | (131,729) | (132,260) | (96,295)
Packaging costs |  | (2,402) | (1,712) | (4,244)
Sales cost of imported goods |  | (113,898) | (125,456) | (120,040)
Insurance |  | (11,199) | (12,110) | (7,620)
Port costs |  | 0 | 0 | 0
CORFO rights |  | (46,274) | (41,962) | (23,155)
Advisory services |  | (804) | (1,322) | (744)
Auditors’ fees |  | (1,823) | (1,768) | (415)
Marketing costs |  | (1,581) | (1,338) | (1,614)
Lease of offices and facilities |  | (878) | (494) | (417)
Advertising costs |  | (54) | (173) | (230)
Other expenses, by nature |  | (91,342) | (51,862) | (68,618)
Other expenses by nature |  | $ (1,557,631) | $ (1,506,452) | $ 1,378,828

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- Definition The ground study amortization expeness. + References No definition available. + Details
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