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INTANGIBLE ASSETS, NET (Tables)

12 Months Ended

Dec. 31, 2020

Disclosure of detailed information about intangible assets [abstract]

Schedule of changes in intangible assets, net


						Year ended December 31, 2020
						Information system projects						Mining assets						Exploration and evaluation costs						Customer relationships and other contractual rights						Trademarks						Goodwill						Total
Values at the beginning of the year
Cost						342,857						256,736						19,522						604,929						73,935						662,307						1,960,286
Accumulated depreciation						(268,476)						(152,219)						—						(521,818)						(73,935)						—						(1,016,448)

Net book value at January 1, 2020						74,381						104,517						19,522						83,111						—						662,307						943,838

Opening net book value						74,381						104,517						19,522						83,111						—						662,307						943,838



Additions						25,698						2,034						23,845						—						—						—						51,577

Transfers						1,021						17,141						(17,146)						—						—						—						1,016
Depreciation charge						(25,259)						(11,078)						—						(51,511)						—						—						(87,848)

Closing net book value						75,841						112,614						26,221						31,600						—						662,307						908,583

Values at the end of the year
Cost						369,468						275,912						26,221						604,929						73,935						662,307						2,012,772
Accumulated depreciation						(293,627)						(163,298)						—						(573,329)						(73,935)						—						(1,104,189)

Net book value at December 31, 2020						75,841						112,614						26,221						31,600						—						662,307						908,583


						Year ended December 31, 2019
						Information system projects						Mining assets						Exploration and evaluation costs						Customer relationships and other contractual rights						Trademarks						Goodwill						Total
Values at the beginning of the year
Cost						320,600						216,203						23,209						604,931						73,935						662,307						1,901,185
Accumulated depreciation						(248,839)						(139,915)						—						(425,972)						(73,935)						—						(888,661)

Net book value at January 1, 2019						71,761						76,288						23,209						178,959						—						662,307						1,012,524

Opening net book value						71,761						76,288						23,209						178,959						—						662,307						1,012,524

Translation differences						(463)						—						—						—						—						—						(463)

Additions						31,812						12,580						24,265						—						—						—						68,657

Transfers						(738)						27,954						(27,952)						—						—						—						(736)
Depreciation charge						(27,991)						(12,305)						—						(95,848)						—						—						(136,144)

Closing net book value						74,381						104,517						19,522						83,111						—						662,307						943,838

Values at the end of the year
Cost						342,857						256,736						19,522						604,929						73,935						662,307						1,960,286
Accumulated depreciation						(268,476)						(152,219)						—						(521,818)						(73,935)						—						(1,016,448)

Net book value at December 31, 2019						74,381						104,517						19,522						83,111						—						662,307						943,838