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Plant and Equipment (Schedule Related to Property, Plant and Equipment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Cost      
Balance at December 31 $ 375,656    
Balance at December 31 405,410 $ 375,656  
Accumulated Depreciation      
Balance at December 31 375,656    
Depreciation 45,408 46,352  
Balance at December 31 405,410 375,656  
NET BOOK VALUE at December 31, 405,410 375,656  
Lease liabilities from finance leases previously recorded in lease obligations     $ 8,767
Previously stated [member]      
Cost      
Balance at December 31 378,509    
Balance at December 31   378,509  
Accumulated Depreciation      
Balance at December 31 378,509    
Balance at December 31   378,509  
NET BOOK VALUE at December 31, 378,509 378,509  
Gross carrying amount [member]      
Cost      
Balance at December 31 509,638 306,403  
Additions 59,138 204,189  
Changes in closure and reclamation provision 682 171  
Disposals (1,744) (1,125)  
Balance at December 31 567,714 509,638  
Accumulated Depreciation      
Balance at December 31 509,638 306,403  
Disposals 1,744 1,125  
Balance at December 31 567,714 509,638  
NET BOOK VALUE at December 31, 567,714 509,638  
Gross carrying amount [member] | Previously stated [member]      
Cost      
Balance at December 31   299,087  
Accumulated Depreciation      
Balance at December 31   299,087  
NET BOOK VALUE at December 31,   299,087  
Gross carrying amount [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]      
Cost      
Balance at December 31   7,316  
Accumulated Depreciation      
Balance at December 31   7,316  
NET BOOK VALUE at December 31,   7,316  
Accumulated depreciation and amortisation [member]      
Cost      
Balance at December 31 (133,982) (106,887)  
Disposals 1,126 825  
Balance at December 31 (162,304) (133,982)  
Accumulated Depreciation      
Balance at December 31 (133,982) (106,887)  
Disposals (1,126) (825)  
Depreciation 29,448 27,920  
Balance at December 31 (162,304) (133,982)  
NET BOOK VALUE at December 31, (162,304) (133,982)  
Machinery and Equipment [member]      
Cost      
Balance at December 31 33,032    
Balance at December 31 61,707 33,032  
Accumulated Depreciation      
Balance at December 31 33,032    
Balance at December 31 61,707 33,032  
NET BOOK VALUE at December 31, 61,707 33,032  
Machinery and Equipment [member] | Gross carrying amount [member]      
Cost      
Balance at December 31 75,246 74,188  
Additions 5,190 1,185  
Changes in closure and reclamation provision 682 171  
Disposals (750) (1,038)  
Transfers 29,636 740  
Balance at December 31 110,004 75,246  
Accumulated Depreciation      
Balance at December 31 75,246 74,188  
Disposals 750 1,038  
Balance at December 31 110,004 75,246  
NET BOOK VALUE at December 31, 110,004 75,246  
Machinery and Equipment [member] | Gross carrying amount [member] | Previously stated [member]      
Cost      
Balance at December 31   74,188  
Accumulated Depreciation      
Balance at December 31   74,188  
NET BOOK VALUE at December 31,   74,188  
Machinery and Equipment [member] | Accumulated depreciation and amortisation [member]      
Cost      
Balance at December 31 (42,214) (35,843)  
Disposals 618 746  
Balance at December 31 (48,297) (42,214)  
Accumulated Depreciation      
Balance at December 31 (42,214) (35,843)  
Disposals (618) (746)  
Depreciation 6,701 7,117  
Balance at December 31 (48,297) (42,214)  
NET BOOK VALUE at December 31, (48,297) (42,214)  
Land, Buildings and Leasehold Improvements [member]      
Cost      
Balance at December 31 81,372    
Balance at December 31 120,231 81,372  
Accumulated Depreciation      
Balance at December 31 81,372    
Balance at December 31 120,231 81,372  
NET BOOK VALUE at December 31, 120,231 81,372  
Land, Buildings and Leasehold Improvements [member] | Gross carrying amount [member]      
Cost      
Balance at December 31 159,732 141,318  
Additions 473 714  
Transfers 51,547 17,700  
Balance at December 31 211,752 159,732  
Accumulated Depreciation      
Balance at December 31 159,732 141,318  
Balance at December 31 211,752 159,732  
NET BOOK VALUE at December 31, 211,752 159,732  
Land, Buildings and Leasehold Improvements [member] | Gross carrying amount [member] | Previously stated [member]      
Cost      
Balance at December 31   141,318  
Accumulated Depreciation      
Balance at December 31   141,318  
NET BOOK VALUE at December 31,   141,318  
Land, Buildings and Leasehold Improvements [member] | Accumulated depreciation and amortisation [member]      
Cost      
Balance at December 31 (78,360) (65,547)  
Balance at December 31 (91,521) (78,360)  
Accumulated Depreciation      
Balance at December 31 (78,360) (65,547)  
Depreciation 13,161 12,813  
Balance at December 31 (91,521) (78,360)  
NET BOOK VALUE at December 31, (91,521) (78,360)  
Furniture and Other Equipment [member]      
Cost      
Balance at December 31 8,681    
Balance at December 31 9,353 8,681  
Accumulated Depreciation      
Balance at December 31 8,681    
Balance at December 31 9,353 8,681  
NET BOOK VALUE at December 31, 9,353 8,681  
Furniture and Other Equipment [member] | Gross carrying amount [member]      
Cost      
Balance at December 31 16,083 11,066  
Additions 1,427 3,464  
Disposals (109) (87)  
Transfers 2,096 1,640  
Balance at December 31 19,497 16,083  
Accumulated Depreciation      
Balance at December 31 16,083 11,066  
Disposals 109 87  
Balance at December 31 19,497 16,083  
NET BOOK VALUE at December 31, 19,497 16,083  
Furniture and Other Equipment [member] | Gross carrying amount [member] | Previously stated [member]      
Cost      
Balance at December 31   11,066  
Accumulated Depreciation      
Balance at December 31   11,066  
NET BOOK VALUE at December 31,   11,066  
Furniture and Other Equipment [member] | Accumulated depreciation and amortisation [member]      
Cost      
Balance at December 31 (7,402) (5,390)  
Disposals 100 79  
Balance at December 31 (10,144) (7,402)  
Accumulated Depreciation      
Balance at December 31 (7,402) (5,390)  
Disposals (100) (79)  
Depreciation 2,842 2,091  
Balance at December 31 (10,144) (7,402)  
NET BOOK VALUE at December 31, (10,144) (7,402)  
Assets under Lease [member]      
Cost      
Balance at December 31 29,665    
Balance at December 31 25,159 29,665  
Accumulated Depreciation      
Balance at December 31 29,665    
Balance at December 31 25,159 29,665  
NET BOOK VALUE at December 31, 25,159 29,665  
Assets under Lease [member] | Gross carrying amount [member]      
Cost      
Balance at December 31 35,671 20,727  
Additions 2,715 14,944  
Disposals (885)    
Balance at December 31 37,501 35,671  
Accumulated Depreciation      
Balance at December 31 35,671 20,727  
Disposals 885    
Balance at December 31 37,501 35,671  
NET BOOK VALUE at December 31, 37,501 35,671  
Assets under Lease [member] | Gross carrying amount [member] | Previously stated [member]      
Cost      
Balance at December 31   13,411  
Accumulated Depreciation      
Balance at December 31   13,411  
NET BOOK VALUE at December 31,   13,411  
Assets under Lease [member] | Gross carrying amount [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]      
Cost      
Balance at December 31   7,316  
Accumulated Depreciation      
Balance at December 31   7,316  
NET BOOK VALUE at December 31,   7,316  
Assets under Lease [member] | Accumulated depreciation and amortisation [member]      
Cost      
Balance at December 31 (6,006) (107)  
Disposals 408    
Balance at December 31 (12,342) (6,006)  
Accumulated Depreciation      
Balance at December 31 (6,006) (107)  
Disposals (408)    
Depreciation 6,744 5,899  
Balance at December 31 (12,342) (6,006)  
NET BOOK VALUE at December 31, (12,342) (6,006)  
Capital Work in Projress Lindero [member]      
Cost      
Balance at December 31 216,482    
Balance at December 31 187,070 216,482  
Accumulated Depreciation      
Balance at December 31 216,482    
Balance at December 31 187,070 216,482  
NET BOOK VALUE at December 31, 187,070 216,482  
Capital Work in Projress Lindero [member] | Gross carrying amount [member]      
Cost      
Balance at December 31 216,482 52,964  
Additions 45,688 174,164  
Transfers (75,100) (10,646)  
Balance at December 31 187,070 216,482  
Accumulated Depreciation      
Balance at December 31 216,482 52,964  
Balance at December 31 187,070 216,482  
NET BOOK VALUE at December 31, 187,070 216,482  
Capital Work in Projress Lindero [member] | Gross carrying amount [member] | Previously stated [member]      
Cost      
Balance at December 31   52,964  
Accumulated Depreciation      
Balance at December 31   52,964  
NET BOOK VALUE at December 31,   52,964  
Capital Work in Progress Other [member]      
Cost      
Balance at December 31 6,424    
Balance at December 31 1,890 6,424  
Accumulated Depreciation      
Balance at December 31 6,424    
Balance at December 31 1,890 6,424  
NET BOOK VALUE at December 31, 1,890 6,424  
Capital Work in Progress Other [member] | Gross carrying amount [member]      
Cost      
Balance at December 31 6,424 6,140  
Additions 3,645 9,718  
Transfers (8,179) (9,434)  
Balance at December 31 1,890 6,424  
Accumulated Depreciation      
Balance at December 31 6,424 6,140  
Balance at December 31 1,890 6,424  
NET BOOK VALUE at December 31, $ 1,890 6,424  
Capital Work in Progress Other [member] | Gross carrying amount [member] | Previously stated [member]      
Cost      
Balance at December 31   6,140  
Accumulated Depreciation      
Balance at December 31   6,140  
NET BOOK VALUE at December 31,   $ 6,140