v3.26.1
Mine properties, plant and equipment - Schedule of detailed information about Mine properties, plant and equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance $ 170,756  
Ending Balance 191,867 $ 170,756
Cost [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 336,595 396,961
Additions 27,536 38,588
Disposals (1,132) (4,674)
Assets held for sale   (10,573)
Reclassifications 0 0
Effects of changes in foreign exchange rates 39,723 (83,707)
Ending Balance 402,722 336,595
Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 165,839 184,785
Depreciation 26,403 31,592
Disposals 1,132 4,674
Assets held for sale   4,766
Effects of changes in foreign exchange rates 19,745 (41,098)
Ending Balance 210,855 165,839
Computer Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 206  
Ending Balance 191 206
Computer Equipment [Member] | Cost [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 670 5,689
Additions 77 1
Disposals (126) (10)
Assets held for sale   (4,894)
Reclassifications 0 0
Effects of changes in foreign exchange rates 56 (116)
Ending Balance 677 670
Computer Equipment [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 464 2,455
Depreciation 113 455
Disposals 126 10
Assets held for sale   2,365
Effects of changes in foreign exchange rates 35 (71)
Ending Balance 486 464
Vehicles [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 27  
Ending Balance 19 27
Vehicles [Member] | Cost [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 270 346
Additions 0 0
Disposals (249) 0
Assets held for sale   0
Reclassifications 0 0
Effects of changes in foreign exchange rates 37 (76)
Ending Balance 58 270
Vehicles [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 243 298
Depreciation 12 12
Disposals 249 0
Assets held for sale   0
Effects of changes in foreign exchange rates 33 (67)
Ending Balance 39 243
Mine Properties [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 72,680  
Ending Balance 90,131 72,680
Mine Properties [Member] | Cost [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 125,964 139,094
Additions 21,126 13,666
Disposals 0 0
Assets held for sale   0
Reclassifications 0 0
Effects of changes in foreign exchange rates 13,231 (26,796)
Ending Balance 160,321 125,964
Mine Properties [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 53,284 49,734
Depreciation 11,426 14,158
Disposals 0 0
Assets held for sale   0
Effects of changes in foreign exchange rates 5,480 (10,608)
Ending Balance 70,190 53,284
Buildings, Plant and Equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 84,133  
Ending Balance 95,477 84,133
Buildings, Plant and Equipment [Member] | Cost [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 195,981 240,061
Additions 3,347 10,492
Disposals (757) (4,664)
Assets held for sale   (5,679)
Reclassifications 12,156 9,007
Effects of changes in foreign exchange rates 24,890 (53,236)
Ending Balance 235,617 195,981
Buildings, Plant and Equipment [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 111,848 132,298
Depreciation 14,852 16,967
Disposals 757 4,664
Assets held for sale   2,401
Effects of changes in foreign exchange rates 14,197 (30,352)
Ending Balance 140,140 111,848
Construction In Progress [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 13,710  
Ending Balance 6,049 13,710
Construction In Progress [Member] | Cost [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 13,710 11,771
Additions 2,986 14,429
Disposals 0 0
Assets held for sale   0
Reclassifications (12,156) (9,007)
Effects of changes in foreign exchange rates 1,509 (3,483)
Ending Balance 6,049 13,710
Construction In Progress [Member] | Accumulated Depreciation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 0 0
Depreciation 0 0
Disposals 0 0
Assets held for sale   0
Effects of changes in foreign exchange rates 0 0
Ending Balance $ 0 $ 0