Selling Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of Selling Expenses [Line Items]
Sales and marketing expense	$ 24,088	$ 21,733	$ 19,365
Sociedad Minera Cerro Verde S.A.A. [Member]
Disclosure of Selling Expenses [Line Items]
concentrate freight	131,528	122,431	51,842
commissions	6,029	5,989	2,729
cathode freight	1,665	2,148	1,644
Other	2,447	823	0
Sales and marketing expense	$ 141,669	$ 131,391	$ 56,215

The amount of expense relating to the marketing and selling of goods or services.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 85
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_85&doctype=Standard
-URIDate 2017-03-09

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration