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Financial Instruments - Financial Assets and Liabilities by Category (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets $ 406,441 $ 404,975
Derivatives [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial liabilities 367  
Debt [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial liabilities   275,000
Cash and cash equivalents [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 167,113 120,564
Trade receivables from provisional concentrate sales [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 35,084 48,767
Receivables not arising from sale of metal concentrates [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 84,486 116,596
Short-term investments | Equity securities [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 111,946 117,776
Short-term investments | Other than equity securities [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets   0
Derivatives [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 7,812 1,272
Amortized cost [member] | Derivatives [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial liabilities 0  
Amortized cost [member] | Debt [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial liabilities   0
FVTPL [member] | Derivatives [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial liabilities 367  
FVTPL [member] | Debt [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial liabilities   275,000
FVTOCI [member] | Derivatives [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial liabilities 0  
FVTOCI [member] | Debt [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial liabilities   0
Amortized cost [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 251,599 237,160
Amortized cost [member] | Cash and cash equivalents [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 167,113 120,564
Amortized cost [member] | Trade receivables from provisional concentrate sales [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 0 0
Amortized cost [member] | Receivables not arising from sale of metal concentrates [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 84,486 116,596
Amortized cost [member] | Short-term investments | Equity securities [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 0 0
Amortized cost [member] | Short-term investments | Other than equity securities [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets   0
Amortized cost [member] | Derivatives [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 0 0
FVTPL [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 154,842 167,815
FVTPL [member] | Cash and cash equivalents [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 0 0
FVTPL [member] | Trade receivables from provisional concentrate sales [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 35,084 48,767
FVTPL [member] | Receivables not arising from sale of metal concentrates [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 0 0
FVTPL [member] | Short-term investments | Equity securities [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 111,946 117,776
FVTPL [member] | Short-term investments | Other than equity securities [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets   0
FVTPL [member] | Derivatives [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 7,812 1,272
FVTOCI [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 0 0
FVTOCI [member] | Cash and cash equivalents [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 0 0
FVTOCI [member] | Trade receivables from provisional concentrate sales [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 0 0
FVTOCI [member] | Receivables not arising from sale of metal concentrates [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 0 0
FVTOCI [member] | Short-term investments | Equity securities [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets 0 0
FVTOCI [member] | Short-term investments | Other than equity securities [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets   0
FVTOCI [member] | Derivatives [member]    
Disclosure of Financial Assets and Liabilities [Line Items]    
Financial assets $ 0 $ 0