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Provisions (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of provisions [Line Items]        
Provision for closure of mining units and exploration projects $ 200,183 $ 206,462 $ 166,403  
Workers’ profit sharing payable 3,569 8,398    
Provision for environmental liabilities 5,534 7,324    
Provision for obligations with communities 19,376 4,710    
Provision for labor contingencies 2,963 3,395    
Provision for safety contingencies 3,898 2,807    
Board of Directors’ participation 1,273 1,140    
Provision for environmental contingencies 1,233 753    
Other provisions 3,695 1,703    
Provisions 241,724 236,692    
Classification by maturity [Abstract]        
Current provisions 76,847 62,502    
Non-current provisions 164,877 174,190    
Provisions 241,724 236,692    
Provision for remediation and mine closure [Member]        
Non-current provisions [abstract]        
Other non-current provisions 156,859 153,313 161,270  
Classification by maturity [Abstract]        
Non-current provisions 156,900 153,300    
Minera Yanacocha SRL and subsidiary [member]        
Disclosure of provisions [Line Items]        
Provision for closure of mining units and exploration projects 1,234,731 [1] 1,012,888 [1] $ 578,959 $ 557,457
Provision for social responsability 21,689 24,335    
Accrual of operating costs 15,064 19,650    
Workers’ profit sharing payable [2] 1,733 13,005    
Other provisions 3,243 23,809    
Provisions 1,276,460 1,093,687    
Classification by maturity [Abstract]        
Current provisions 39,495 68,662    
Non-current provisions 1,236,965 1,025,025    
Provisions 1,276,460 1,093,687    
Sociedad Minera Cerro Verde S.A.A. [Member]        
Current provisions [abstract]        
Other current provisions 19,202 24,458    
Non-current provisions [abstract]        
Other non-current provisions 347,087 164,622    
Sociedad Minera Cerro Verde S.A.A. [Member] | Provision for social commitments [Member]        
Current provisions [abstract]        
Other current provisions [3] 2,767 11,722    
Non-current provisions [abstract]        
Other non-current provisions [3] 8,229 4,060    
Sociedad Minera Cerro Verde S.A.A. [Member] | Provisions related to services and freight not invoiced [Member]        
Current provisions [abstract]        
Other current provisions 14,513 11,231    
Sociedad Minera Cerro Verde S.A.A. [Member] | Provision for remediation and mine closure [Member]        
Current provisions [abstract]        
Other current provisions [4] 690 0    
Non-current provisions [abstract]        
Other non-current provisions [4] 156,169 153,313    
Sociedad Minera Cerro Verde S.A.A. [Member] | Legal proceedings provision [member]        
Current provisions [abstract]        
Other current provisions 1,232 1,505    
Sociedad Minera Cerro Verde S.A.A. [Member] | Miscellaneous other provisions [member]        
Non-current provisions [abstract]        
Other non-current provisions [5] 15,889 7,249    
Sociedad Minera Cerro Verde S.A.A. [Member] | Provision for royalties and mining tax [Member]        
Non-current provisions [abstract]        
Other non-current provisions [6] 148,530 0    
Sociedad Minera Cerro Verde S.A.A. [Member] | Provision for interest [Member]        
Non-current provisions [abstract]        
Other non-current provisions [7] $ 18,270 $ 0    
[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.
[2] Workers' profit sharing - In accordance with Peruvian legislation, the Company maintains an employee profit sharing plan equal to 8% of annual taxable income. Distributions to employees under the plan are based 50% on the number of days that each employee worked during the preceding year and 50% on proportionate annual salary levels.
[3] The provision for social commitments as of December 31, 2017, is associated with an irrigation project in La Joya (US$5.5 million) and repaving Alata-Congata Road (US$5.5 million).
[4] The Company’s mineral exploitation activities are subject to environmental protection standards. In order to comply with these standards, the Company has obtained the approval for the Environment Adequacy Program (PAMA) and for the Environmental Impact Studies (EIA), required for the operation of Cerro Verde’s production unit.
[5] Represents prior year SUNAT assessments related to income and non-income tax contingencies in which the Company expects to obtain an unfavorable result of US$11.4 million.
[6] Represents the non-current portion of disputed mining royalties for the period December 2006 through September 2011 of US$127.5 million, net asset tax (ITAN) for the years 2010, 2011 and 2013 of US$19.6 million, penalties of royalties for the period December 2006 to 2008 of US$1.4 million (see Note 18(a)).
[7] Represent the non-current portion of interest and interest on penalties associated with the installment program of mining royalties for the period December 2006 through the year 2008 (see Note 14(d)).