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Provisions (Details 1) - USD ($) $ in Thousands |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 07, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of provisions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ 206,462 |  | $ 166,403 |  |  |  |  |  |  |
Transfer of units held for sale |  | 0 |  | 15,851 |  |  |  |  |  |  |
Reversal of impairment loss |  | (11,770) |  | 0 |  | $ 0 |  |  |  |  |
Changes and additions in estimates (discontinued operations), note 1(e) |  | 12,701 |  | 3,365 |  |  |  |  |  |  |
Accretion expense (discontinued operations), note 1(e) |  | 215 |  | 970 |  |  |  |  |  |  |
Changes and additions in estimates (continued operations), note 12(a) |  | 10,594 |  | 34,532 |  |  |  |  |  |  |
Accretion expense (continued operations), note 27 |  | 4,382 |  | 4,116 |  |  |  |  |  |  |
Provision for exploration projects |  | 891 |  | 0 |  |  |  |  |  |  |
Disbursements |  | (23,292) |  | (18,775) |  |  |  |  |  |  |
Final balance |  | 200,183 |  | 206,462 |  | 166,403 |  |  |  |  |
Classification by maturity |  |  |  |  |  |  |  |  |  |  |
Current portion |  |  |  |  |  |  | $ 39,826 |  | $ 37,405 |  |
Non-current portion |  |  |  |  |  |  | 160,357 |  | 169,057 |  |
Provision for closure of mining units and exploration projects |  | 200,183 |  | 206,462 |  | 166,403 | 200,183 |  | 206,462 |  | $ 166,403
Increase (decrease) through transfers and other changes, other provisions |  | 3,700 |  |  |  |  |  |  |  |  |
Provision for remediation and mine closure [Member] |  |  |  |  |  |  |  |  |  |  |
Classification by maturity |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 153,313 |  | 161,270 |  |  |  |  |  |  |
Increase through adjustments arising from passage of time, other provisions |  | 4,595 |  | 4,391 |  |  |  |  |  |  |
Increase (decrease) through transfers and other changes, other provisions |  | (3,710) |  | (16,091) |  |  |  |  |  |  |
Additional provisions, other provisions |  | 2,661 |  | 3,743 |  |  |  |  |  |  |
Final balance |  | 156,859 |  | 153,313 |  | 161,270 |  |  |  |  |
Minera Yanacocha SRL and subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of provisions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 1,012,888 | [1] | 578,959 |  | 557,457 |  |  |  |  |
Additional provisions | $ 430,000 | 221,450 |  | 430,292 |  | 10,434 |  |  |  |  |
Payments |  | (21,376) |  | (10,467) |  | (11,007) |  |  |  |  |
Unwinding of discount, note 19 |  | 21,769 |  | 14,104 |  | 22,075 |  |  |  |  |
Final balance |  | 1,234,731 | [1] | 1,012,888 | [1] | 578,959 |  |  |  |  |
Classification by maturity |  |  |  |  |  |  |  |  |  |  |
Current portion |  |  |  |  |  |  | 19,455 |  | 15,636 |  | 6,698
Non-current portion |  |  |  |  |  |  | 1,215,276 |  | 997,252 |  | 572,261
Provision for closure of mining units and exploration projects |  | $ 1,234,731 | [1] | $ 1,012,888 | [1] | $ 578,959 | $ 1,234,731 | [1] | $ 1,012,888 | [1] | $ 578,959
[1] | Provision for closure of mining units and explorations projects - The Company's mining and exploration activities are subject to various laws and regulations governing the protection of the environment. These laws and regulations are continually changing and are generally becoming more restrictive. The Company conducts its operations so as to protect the public health and environment and believes its operations are in compliance with all applicable laws and regulations in all material respects. The Company has made, and expects to make in the future, expenditures to comply with such laws and regulations, but cannot predict the amount of such future expenditures. Estimated future reclamation costs are based principally on legal and regulatory requirements.

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