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Management of Financial Risk (Schedule of Company's Liquidity Risk) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Trade and other payables $ 65,286 $ 48,510
Debt 156,000 70,000
Income tax payable 12,400 8,358
Lease obligations 37,792  
Other liabilities (note 18) 499 1,166
Derivative liabilities   224
Equipment loan   9,699
Operating leases   2,553
Capital commitments, Lindero 24,467 111,940
Provisions 33,365 17,907
Total financial liabilities 329,809 270,357
Less than one year    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Trade and other payables 65,286 48,510
Income tax payable 12,400 8,358
Lease obligations 9,313  
Derivative liabilities   224
Equipment loan   4,328
Operating leases   1,055
Capital commitments, Lindero 24,467 111,940
Provisions 2,699 878
Total financial liabilities 114,165 175,293
Deposits on equipments and advances to contractors 10,900  
Later than one year and not later than three years [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 110,000  
Lease obligations 9,424  
Other liabilities (note 18) 499 1,166
Equipment loan   5,371
Operating leases   1,248
Provisions 7,565 6,738
Total financial liabilities 127,488 14,523
Later than three years and not later than five years [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Debt 46,000 70,000
Lease obligations 4,097  
Operating leases   250
Provisions 1,846 4,029
Total financial liabilities 51,943 74,279
More than five years    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Lease obligations 14,958  
Provisions 21,255 6,262
Total financial liabilities $ 36,213 $ 6,262