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Plant and Equipment (Schedule Related to Property, Plant and Equipment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Cost      
Balance at December 31 $ 192,200    
Balance at December 31 378,509 $ 192,200  
Accumulated Depreciation      
Balance at December 31 192,200    
Depreciation 46,003 44,774  
Balance at December 31 378,509 192,200  
NET BOOK VALUE at December 31, 378,509 192,200  
Lease liabilities from finance leases previously recorded in lease obligations     $ 8,767
Increase (decrease) due to changes in accounting policy required by IFRSs [member]      
Cost      
Balance at December 31 7,316    
Balance at December 31   7,316  
Accumulated Depreciation      
Balance at December 31 7,316    
Balance at December 31   7,316  
NET BOOK VALUE at December 31, 7,316 7,316  
Gross carrying amount [member]      
Cost      
Balance at December 31 306,403 221,649  
Additions 207,042 79,131  
Changes in closure and reclamation provision 171 550  
Disposals (1,125) (2,243)  
Balance at December 31 512,491 306,403  
Accumulated Depreciation      
Balance at December 31 306,403 221,649  
Disposals (1,125) (2,243)  
Balance at December 31 512,491 306,403  
NET BOOK VALUE at December 31, 512,491 306,403  
Gross carrying amount [member] | Previously stated [member]      
Cost      
Balance at December 31 299,087    
Balance at December 31   299,087  
Accumulated Depreciation      
Balance at December 31 299,087    
Balance at December 31   299,087  
NET BOOK VALUE at December 31, 299,087 299,087  
Accumulated depreciation and amortisation [member]      
Cost      
Balance at December 31 106,887 87,985  
Disposals (825) (2,040)  
Balance at December 31 133,982 106,887  
Accumulated Depreciation      
Balance at December 31 106,887 87,985  
Disposals (825) (2,040)  
Depreciation 27,920 20,942  
Balance at December 31 133,982 106,887  
NET BOOK VALUE at December 31, 133,982 106,887  
Machinery and Equipment [member]      
Cost      
Balance at December 31 38,345    
Balance at December 31 33,032 38,345  
Accumulated Depreciation      
Balance at December 31 38,345    
Balance at December 31 33,032 38,345  
NET BOOK VALUE at December 31, 33,032 38,345  
Machinery and Equipment [member] | Gross carrying amount [member]      
Cost      
Balance at December 31 74,188 62,217  
Additions 1,185 3,122  
Changes in closure and reclamation provision 171 550  
Disposals (1,038) (1,859)  
Reclassifications 740 10,158  
Balance at December 31 75,246 74,188  
Accumulated Depreciation      
Balance at December 31 74,188 62,217  
Disposals (1,038) (1,859)  
Reclassifications 740 10,158  
Balance at December 31 75,246 74,188  
NET BOOK VALUE at December 31, 75,246 74,188  
Machinery and Equipment [member] | Gross carrying amount [member] | Previously stated [member]      
Cost      
Balance at December 31 74,188    
Balance at December 31   74,188  
Accumulated Depreciation      
Balance at December 31 74,188    
Balance at December 31   74,188  
NET BOOK VALUE at December 31, 74,188 74,188  
Machinery and Equipment [member] | Accumulated depreciation and amortisation [member]      
Cost      
Balance at December 31 35,843 27,570  
Disposals (746) (1,719)  
Reclassifications   3,152  
Balance at December 31 42,214 35,843  
Accumulated Depreciation      
Balance at December 31 35,843 27,570  
Disposals (746) (1,719)  
Reclassifications   3,152  
Depreciation 7,117 6,840  
Balance at December 31 42,214 35,843  
NET BOOK VALUE at December 31, 42,214 35,843  
Land, Buildings and Leasehold Improvements [member]      
Cost      
Balance at December 31 75,771    
Balance at December 31 81,372 75,771  
Accumulated Depreciation      
Balance at December 31 75,771    
Balance at December 31 81,372 75,771  
NET BOOK VALUE at December 31, 81,372 75,771  
Land, Buildings and Leasehold Improvements [member] | Gross carrying amount [member]      
Cost      
Balance at December 31 141,318 131,738  
Additions 714 390  
Reclassifications 17,700 9,190  
Balance at December 31 159,732 141,318  
Accumulated Depreciation      
Balance at December 31 141,318 131,738  
Reclassifications 17,700 9,190  
Balance at December 31 159,732 141,318  
NET BOOK VALUE at December 31, 159,732 141,318  
Land, Buildings and Leasehold Improvements [member] | Gross carrying amount [member] | Previously stated [member]      
Cost      
Balance at December 31 141,318    
Balance at December 31   141,318  
Accumulated Depreciation      
Balance at December 31 141,318    
Balance at December 31   141,318  
NET BOOK VALUE at December 31, 141,318 141,318  
Land, Buildings and Leasehold Improvements [member] | Accumulated depreciation and amortisation [member]      
Cost      
Balance at December 31 65,547 52,353  
Reclassifications   538  
Balance at December 31 78,360 65,547  
Accumulated Depreciation      
Balance at December 31 65,547 52,353  
Reclassifications   538  
Depreciation 12,813 12,656  
Balance at December 31 78,360 65,547  
NET BOOK VALUE at December 31, 78,360 65,547  
Furniture and Other Equipment [member]      
Cost      
Balance at December 31 5,676    
Balance at December 31 8,681 5,676  
Accumulated Depreciation      
Balance at December 31 5,676    
Balance at December 31 8,681 5,676  
NET BOOK VALUE at December 31, 8,681 5,676  
Furniture and Other Equipment [member] | Gross carrying amount [member]      
Cost      
Balance at December 31 11,066 7,478  
Additions 3,464 7,405  
Disposals (87) (358)  
Reclassifications 1,640 (3,459)  
Balance at December 31 16,083 11,066  
Accumulated Depreciation      
Balance at December 31 11,066 7,478  
Disposals (87) (358)  
Reclassifications 1,640 (3,459)  
Balance at December 31 16,083 11,066  
NET BOOK VALUE at December 31, 16,083 11,066  
Furniture and Other Equipment [member] | Gross carrying amount [member] | Previously stated [member]      
Cost      
Balance at December 31 11,066    
Balance at December 31   11,066  
Accumulated Depreciation      
Balance at December 31 11,066    
Balance at December 31   11,066  
NET BOOK VALUE at December 31, 11,066 11,066  
Furniture and Other Equipment [member] | Accumulated depreciation and amortisation [member]      
Cost      
Balance at December 31 5,390 4,552  
Disposals (79) (295)  
Reclassifications   18  
Balance at December 31 7,402 5,390  
Accumulated Depreciation      
Balance at December 31 5,390 4,552  
Disposals (79) (295)  
Reclassifications   18  
Depreciation 2,091 1,115  
Balance at December 31 7,402 5,390  
NET BOOK VALUE at December 31, 7,402 5,390  
Assets under Lease [member]      
Cost      
Balance at December 31 13,304    
Balance at December 31 29,665 13,304  
Accumulated Depreciation      
Balance at December 31 13,304    
Balance at December 31 29,665 13,304  
NET BOOK VALUE at December 31, 29,665 13,304  
Assets under Lease [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]      
Cost      
Balance at December 31 7,316    
Balance at December 31   7,316  
Accumulated Depreciation      
Balance at December 31 7,316    
Balance at December 31   7,316  
NET BOOK VALUE at December 31, 7,316 7,316  
Assets under Lease [member] | Gross carrying amount [member]      
Cost      
Balance at December 31 20,727 7,295  
Additions 14,944    
Disposals   (26)  
Reclassifications   6,142  
Balance at December 31 35,671 20,727  
Accumulated Depreciation      
Balance at December 31 20,727 7,295  
Disposals   (26)  
Reclassifications   6,142  
Balance at December 31 35,671 20,727  
NET BOOK VALUE at December 31, 35,671 20,727  
Assets under Lease [member] | Gross carrying amount [member] | Previously stated [member]      
Cost      
Balance at December 31 13,411    
Balance at December 31   13,411  
Accumulated Depreciation      
Balance at December 31 13,411    
Balance at December 31   13,411  
NET BOOK VALUE at December 31, 13,411 13,411  
Assets under Lease [member] | Accumulated depreciation and amortisation [member]      
Cost      
Balance at December 31 107 3,510  
Disposals   (26)  
Reclassifications   (3,708)  
Balance at December 31 6,006 107  
Accumulated Depreciation      
Balance at December 31 107 3,510  
Disposals   (26)  
Reclassifications   (3,708)  
Depreciation 5,899 331  
Balance at December 31 6,006 107  
NET BOOK VALUE at December 31, 6,006 107  
Capital Work in Projress Lindero [member]      
Cost      
Balance at December 31 52,964    
Balance at December 31 219,335 52,964  
Accumulated Depreciation      
Balance at December 31 52,964    
Balance at December 31 219,335 52,964  
NET BOOK VALUE at December 31, 219,335 52,964  
Capital Work in Projress Lindero [member] | Gross carrying amount [member]      
Cost      
Balance at December 31 52,964 4,360  
Additions 177,017 59,356  
Reclassifications (10,646) (10,752)  
Balance at December 31 219,335 52,964  
Accumulated Depreciation      
Balance at December 31 52,964 4,360  
Reclassifications (10,646) (10,752)  
Balance at December 31 219,335 52,964  
NET BOOK VALUE at December 31, 219,335 52,964  
Capital Work in Projress Lindero [member] | Gross carrying amount [member] | Previously stated [member]      
Cost      
Balance at December 31 52,964    
Balance at December 31   52,964  
Accumulated Depreciation      
Balance at December 31 52,964    
Balance at December 31   52,964  
NET BOOK VALUE at December 31, 52,964 52,964  
Capital Work in Progress Other [member]      
Cost      
Balance at December 31 6,140    
Balance at December 31 6,424 6,140  
Accumulated Depreciation      
Balance at December 31 6,140    
Balance at December 31 6,424 6,140  
NET BOOK VALUE at December 31, 6,424 6,140  
Capital Work in Progress Other [member] | Gross carrying amount [member]      
Cost      
Balance at December 31 6,140 8,561  
Additions 9,718 8,858  
Reclassifications (9,434) (11,279)  
Balance at December 31 6,424 6,140  
Accumulated Depreciation      
Balance at December 31 6,140 8,561  
Reclassifications (9,434) (11,279)  
Balance at December 31 6,424 6,140  
NET BOOK VALUE at December 31, 6,424 6,140  
Capital Work in Progress Other [member] | Gross carrying amount [member] | Previously stated [member]      
Cost      
Balance at December 31 6,140    
Balance at December 31   6,140  
Accumulated Depreciation      
Balance at December 31 6,140    
Balance at December 31   6,140  
NET BOOK VALUE at December 31, $ 6,140 $ 6,140