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Tax situation (Details 4)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Disclosure Of Income Tax Explanatory [Line Items]  
Tax assesments, Estimated possible losses $ 252,624
Tax Assesments, penalties and interest expenses 617,090
Year 2003 - 2005 [Member]  
Disclosure Of Income Tax Explanatory [Line Items]  
Tax assesments, Estimated possible losses 15,909
Tax Assesments, penalties and interest expenses 69,962
Year 2006 [Member]  
Disclosure Of Income Tax Explanatory [Line Items]  
Tax assesments, Estimated possible losses 6,545
Tax Assesments, penalties and interest expenses 65,999
Year 2007 [Member]  
Disclosure Of Income Tax Explanatory [Line Items]  
Tax assesments, Estimated possible losses 12,376
Tax Assesments, penalties and interest expenses 30,185
Year 2009 [Member]  
Disclosure Of Income Tax Explanatory [Line Items]  
Tax assesments, Estimated possible losses 58,495
Tax Assesments, penalties and interest expenses 107,607
Year 2008 [Member]  
Disclosure Of Income Tax Explanatory [Line Items]  
Tax assesments, Estimated possible losses 20,797
Tax Assesments, penalties and interest expenses 33,765
Year 2010 [Member]  
Disclosure Of Income Tax Explanatory [Line Items]  
Tax assesments, Estimated possible losses 65,997
Tax Assesments, penalties and interest expenses 173,136
Year 2014 -2017 [Member]  
Disclosure Of Income Tax Explanatory [Line Items]  
Tax assesments, Estimated possible losses 23,450
Tax Assesments, penalties and interest expenses 23,450
Year 2011 [Member]  
Disclosure Of Income Tax Explanatory [Line Items]  
Tax assesments, Estimated possible losses 49,055
Tax Assesments, penalties and interest expenses 112,986
Sociedad Minera Cerro Verde S.A.A. [Member]  
Disclosure Of Income Tax Explanatory [Line Items]  
Tax assesments, Estimated possible losses 252,624
Tax Assesments, penalties and interest expenses 364,466
Tax Assesments,estimated possible losses including penalties and interest expenses 617,090
Sociedad Minera Cerro Verde S.A.A. [Member] | Year 2003 - 2005 [Member]  
Disclosure Of Income Tax Explanatory [Line Items]  
Tax assesments, Estimated possible losses 15,909
Tax Assesments, penalties and interest expenses 54,053
Tax Assesments,estimated possible losses including penalties and interest expenses 69,962
Sociedad Minera Cerro Verde S.A.A. [Member] | Year 2006 [Member]  
Disclosure Of Income Tax Explanatory [Line Items]  
Tax assesments, Estimated possible losses 6,545
Tax Assesments, penalties and interest expenses 59,454
Tax Assesments,estimated possible losses including penalties and interest expenses 65,999
Sociedad Minera Cerro Verde S.A.A. [Member] | Year 2007 [Member]  
Disclosure Of Income Tax Explanatory [Line Items]  
Tax assesments, Estimated possible losses 12,376
Tax Assesments, penalties and interest expenses 17,809
Tax Assesments,estimated possible losses including penalties and interest expenses 30,185
Sociedad Minera Cerro Verde S.A.A. [Member] | Year 2009 [Member]  
Disclosure Of Income Tax Explanatory [Line Items]  
Tax assesments, Estimated possible losses 58,495
Tax Assesments, penalties and interest expenses 49,112
Tax Assesments,estimated possible losses including penalties and interest expenses 107,607
Sociedad Minera Cerro Verde S.A.A. [Member] | Year 2008 [Member]  
Disclosure Of Income Tax Explanatory [Line Items]  
Tax assesments, Estimated possible losses 20,797
Tax Assesments, penalties and interest expenses 12,968
Tax Assesments,estimated possible losses including penalties and interest expenses 33,765
Sociedad Minera Cerro Verde S.A.A. [Member] | Year 2010 [Member]  
Disclosure Of Income Tax Explanatory [Line Items]  
Tax assesments, Estimated possible losses 65,997
Tax Assesments, penalties and interest expenses 107,139
Tax Assesments,estimated possible losses including penalties and interest expenses 173,136
Sociedad Minera Cerro Verde S.A.A. [Member] | Year 2014 -2017 [Member]  
Disclosure Of Income Tax Explanatory [Line Items]  
Tax assesments, Estimated possible losses 23,450
Tax Assesments, penalties and interest expenses 0
Tax Assesments,estimated possible losses including penalties and interest expenses 23,450
Sociedad Minera Cerro Verde S.A.A. [Member] | Year 2011 [Member]  
Disclosure Of Income Tax Explanatory [Line Items]  
Tax assesments, Estimated possible losses 49,055
Tax Assesments, penalties and interest expenses 63,931
Tax Assesments,estimated possible losses including penalties and interest expenses $ 112,986