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Subsequent Event
 12 Months Ended
Dec. 31, 2017
Sociedad Minera Cerro Verde S.A.A. [Member]  
Disclosure of Subsequent Event [Line Items]  
Disclosure of events after reporting period [text block]
27.
Subsequent Event
 
There have been no subsequent significant financial and accounting events subsequent to December 31, 2017, that may affect the interpretation of these financial statements.