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Other Financial Liabilities (debt) (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Other Financial Liabilities debt [Line Items]      
Cash flows from (used in) financing activities $ 59,575 $ (24,500) $ 214,420
Sociedad Minera El Brocal S.A.A. [Member]      
Disclosure Of Other Financial Liabilities debt [Line Items]      
Other financial liabilities 1,996,004 2,425,165 452,850
Cash flows from (used in) financing activities (738,260) (443,169) 1,965,481
Others change in other financial liabilites 10,744 14,008 6,831
Other financial liabilities 1,268,488 1,996,004 2,425,165
Leases [Member] | Sociedad Minera El Brocal S.A.A. [Member]      
Disclosure Of Other Financial Liabilities debt [Line Items]      
Other financial liabilities 161 330 493
Cash flows from (used in) financing activities (161) (169) (163)
Others change in other financial liabilites 0 0 0
Other financial liabilities 0 161 330
Senior unsecured credit facility [Member] | Sociedad Minera El Brocal S.A.A. [Member]      
Disclosure Of Other Financial Liabilities debt [Line Items]      
Other financial liabilities 1,400,000 1,800,000 425,000
Cash flows from (used in) financing activities (120,000) (400,000) 1,375,000
Others change in other financial liabilites 0 0 0
Other financial liabilities 1,280,000 1,400,000 1,800,000
Shareholder loans [Member] | Sociedad Minera El Brocal S.A.A. [Member]      
Disclosure Of Other Financial Liabilities debt [Line Items]      
Other financial liabilities 606,014 600,907 0
Cash flows from (used in) financing activities (606,014) 0 600,000
Others change in other financial liabilites 0 5,107 907
Other financial liabilities 0 606,014 600,907
Debt issuance cost [Member] | Sociedad Minera El Brocal S.A.A. [Member]      
Disclosure Of Other Financial Liabilities debt [Line Items]      
Other financial liabilities (10,171) (19,072) (22,643)
Cash flows from (used in) financing activities (12,085) 0 (2,356)
Others change in other financial liabilites 10,744 8,901 5,927
Other financial liabilities (11,512) (10,171) (19,072)
Other financial liabilities, noncurrent liabilities [Member] | Sociedad Minera El Brocal S.A.A. [Member]      
Disclosure Of Other Financial Liabilities debt [Line Items]      
Other financial liabilities 1,995,843 2,381,835 402,357
Cash flows from (used in) financing activities (738,099) (400,000) 1,972,644
Others change in other financial liabilites 10,744 14,008 6,831
Other financial liabilities 1,268,488 1,995,843 2,381,835
Promissory notes [Member] | Sociedad Minera El Brocal S.A.A. [Member]      
Disclosure Of Other Financial Liabilities debt [Line Items]      
Other financial liabilities 0 43,000 50,000
Cash flows from (used in) financing activities   (43,000) (7,000)
Others change in other financial liabilites   0 0
Other financial liabilities   0 43,000
Other financial liabilities, current liabilities [Member] | Sociedad Minera El Brocal S.A.A. [Member]      
Disclosure Of Other Financial Liabilities debt [Line Items]      
Other financial liabilities $ 161 43,330 50,493
Cash flows from (used in) financing activities   (43,169) (7,163)
Others change in other financial liabilites   0 0
Other financial liabilities   $ 161 $ 43,330