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PROPERTY, PLANT AND MINE DEVELOPMENT (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Property, plant and mine development |  |
Property, plant and equipment at beginning of period | $ 5,106,036 | $ 5,088,967
Additions | 1,044,540 | 576,209
Gain on impairment reversal |  | 120,161
Disposals | (16,104) | (19,548)
Amortization | (507,920) | (659,753)
Property, plant and equipment at end of period | 5,626,552 | 5,106,036
Mining Properties |  |
Property, plant and mine development |  |
Property, plant and equipment at beginning of period | 1,605,536 | 1,665,610
Additions | 174,374 | 53,072
Gain on impairment reversal |  | 83,992
Disposals | (6,750) | (1,890)
Amortization | (127,579) | (207,383)
Transfers between categories | 19,946 | 12,135
Property, plant and equipment at end of period | 1,665,527 | 1,605,536
Plant and Equipment |  |
Property, plant and mine development |  |
Property, plant and equipment at beginning of period | 2,024,283 | 2,064,406
Additions | 221,924 | 244,018
Gain on impairment reversal |  | 36,169
Disposals | (9,354) | (17,658)
Amortization | (276,493) | (342,208)
Transfers between categories | 30,761 | 39,556
Property, plant and equipment at end of period | 1,991,121 | 2,024,283
Mine Development Costs |  |
Property, plant and mine development |  |
Property, plant and equipment at beginning of period | 1,476,217 | 1,358,951
Additions | 648,242 | 279,119
Amortization | (103,848) | (110,162)
Transfers between categories | (50,707) | (51,691)
Property, plant and equipment at end of period | 1,969,904 | 1,476,217
Assets under construction |  |
Property, plant and mine development |  |
Property, plant and equipment at beginning of period | 532,300 |
Property, plant and equipment at end of period | 910,600 | 532,300
Gross carrying amount |  |
Property, plant and mine development |  |
Property, plant and equipment at beginning of period | 8,878,584 |
Property, plant and equipment at end of period | 10,033,352 | 8,878,584
Gross carrying amount | Mining Properties |  |
Property, plant and mine development |  |
Property, plant and equipment at beginning of period | 2,593,659 |
Property, plant and equipment at end of period | 2,782,732 | 2,593,659
Gross carrying amount | Plant and Equipment |  |
Property, plant and mine development |  |
Property, plant and equipment at beginning of period | 4,233,945 |
Property, plant and equipment at end of period | 4,602,106 | 4,233,945
Gross carrying amount | Mine Development Costs |  |
Property, plant and mine development |  |
Property, plant and equipment at beginning of period | 2,050,980 |
Property, plant and equipment at end of period | 2,648,514 | 2,050,980
Accumulated depreciation, amortization and impairment |  |
Property, plant and mine development |  |
Property, plant and equipment at beginning of period | (3,772,548) |
Property, plant and equipment at end of period | (4,406,800) | (3,772,548)
Accumulated depreciation, amortization and impairment | Mining Properties |  |
Property, plant and mine development |  |
Property, plant and equipment at beginning of period | (988,123) |
Property, plant and equipment at end of period | (1,117,205) | (988,123)
Accumulated depreciation, amortization and impairment | Plant and Equipment |  |
Property, plant and mine development |  |
Property, plant and equipment at beginning of period | (2,209,662) |
Property, plant and equipment at end of period | (2,610,985) | (2,209,662)
Accumulated depreciation, amortization and impairment | Mine Development Costs |  |
Property, plant and mine development |  |
Property, plant and equipment at beginning of period | (574,763) |
Property, plant and equipment at end of period | $ (678,610) | $ (574,763)

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- Definition Amount of increase (decrease) in accumulated depreciation, depletion and amortization of property, plant and equipment. + References No definition available. + Details
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- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_i&doctype=Standard -URIDate 2017-03-09 + Details
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