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Other Financial Liabilities (debt) - Movement of the changes derived from the financing activities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Other Financial Liabilities debt [Line Items]      
Cash flows from (used in) financing activities $ (100,618) $ (74,052) $ 59,575
Sociedad Minera El Brocal S.A.A. [Member]      
Disclosure Of Other Financial Liabilities debt [Line Items]      
Other financial liabilities 1,022,810 1,268,488  
Additions 550 0  
Payments (210,479) (250,000)  
Others change in other financial liabilities 3,066 4,322  
Other financial liabilities 911,675 1,022,810 1,268,488
IFRS 16 [Member]      
Disclosure Of Other Financial Liabilities debt [Line Items]      
Cash flows from (used in) financing activities (7,596)    
IFRS 16 [Member] | Sociedad Minera El Brocal S.A.A. [Member]      
Disclosure Of Other Financial Liabilities debt [Line Items]      
Other financial liabilities 95,728    
Leases, Current [Member] | Sociedad Minera El Brocal S.A.A. [Member]      
Disclosure Of Other Financial Liabilities debt [Line Items]      
Other financial liabilities 0 0  
Additions 464 0  
Payments (10,479) 0  
Others change in other financial liabilities 10,751 0  
Other financial liabilities 8,855 0 0
Leases, Current [Member] | IFRS 16 [Member] | Sociedad Minera El Brocal S.A.A. [Member]      
Disclosure Of Other Financial Liabilities debt [Line Items]      
Other financial liabilities 8,119    
Noncurrent, Leases [Member] | Sociedad Minera El Brocal S.A.A. [Member]      
Disclosure Of Other Financial Liabilities debt [Line Items]      
Other financial liabilities 0 0  
Additions 86 0  
Payments 0 0  
Others change in other financial liabilities (10,751) 0  
Other financial liabilities 76,944 0 0
Noncurrent, Leases [Member] | IFRS 16 [Member] | Sociedad Minera El Brocal S.A.A. [Member]      
Disclosure Of Other Financial Liabilities debt [Line Items]      
Other financial liabilities 87,609    
Senior unsecured credit facility [Member] | Sociedad Minera El Brocal S.A.A. [Member]      
Disclosure Of Other Financial Liabilities debt [Line Items]      
Other financial liabilities 1,030,000 1,280,000  
Additions 0 0  
Payments (200,000) (250,000)  
Others change in other financial liabilities 0 0  
Other financial liabilities 830,000 1,030,000 1,280,000
Senior unsecured credit facility [Member] | IFRS 16 [Member] | Sociedad Minera El Brocal S.A.A. [Member]      
Disclosure Of Other Financial Liabilities debt [Line Items]      
Other financial liabilities 0    
Debt issuance cost [Member] | Sociedad Minera El Brocal S.A.A. [Member]      
Disclosure Of Other Financial Liabilities debt [Line Items]      
Other financial liabilities 7,190 11,512  
Additions 0 0  
Payments 0 0  
Others change in other financial liabilities 3,066 4,322  
Other financial liabilities 4,124 $ 7,190 $ 11,512
Debt issuance cost [Member] | IFRS 16 [Member] | Sociedad Minera El Brocal S.A.A. [Member]      
Disclosure Of Other Financial Liabilities debt [Line Items]      
Other financial liabilities $ 0