v3.26.1
Plant and Equipment - Schedule of Plant and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning $ 93,793  
Balance at Ending 108,510 $ 93,793
Cost [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 195,778 174,466
Additions 9,754 23,240
Transfer to investment properties (121)
Disposals (2,700) (1,463)
Reclassification of asset groups
Impact of foreign currency translation 10,199 (867)
Balance at Ending 223,742 195,778
Cost [Member] | Adventus Mining Corporation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Acquisition   523
Cost [Member] | Chaarat Zaav Cjsc [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Acquisition 10,711  
Cost [Member] | Land and buildings [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 132,178 108,809
Additions 2,087 356
Transfer to investment properties (121)
Disposals (526) (242)
Reclassification of asset groups 2,350 23,983
Impact of foreign currency translation 6,855 (607)
Balance at Ending 145,194 132,178
Cost [Member] | Land and buildings [Member] | Adventus Mining Corporation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Acquisition  
Cost [Member] | Land and buildings [Member] | Chaarat Zaav Cjsc [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Acquisition 2,250  
Cost [Member] | Office equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 12,588 11,464
Additions 781 896
Transfer to investment properties
Disposals (843) (135)
Reclassification of asset groups 38 361
Impact of foreign currency translation 614 (49)
Balance at Ending 13,233 12,588
Cost [Member] | Office equipment [Member] | Adventus Mining Corporation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Acquisition   51
Cost [Member] | Office equipment [Member] | Chaarat Zaav Cjsc [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Acquisition 55  
Cost [Member] | Machinery [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 39,511 34,423
Additions 821 2,316
Transfer to investment properties
Disposals (872) (751)
Reclassification of asset groups 1,319 3,347
Impact of foreign currency translation 2,091 (171)
Balance at Ending 43,030 39,511
Cost [Member] | Machinery [Member] | Adventus Mining Corporation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Acquisition   347
Cost [Member] | Machinery [Member] | Chaarat Zaav Cjsc [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Acquisition 160  
Cost [Member] | Motor vehicles [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 7,775 7,577
Additions 1,249 439
Transfer to investment properties
Disposals (459) (335)
Reclassification of asset groups
Impact of foreign currency translation 413 (31)
Balance at Ending 9,082 7,775
Cost [Member] | Motor vehicles [Member] | Adventus Mining Corporation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Acquisition   125
Cost [Member] | Motor vehicles [Member] | Chaarat Zaav Cjsc [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Acquisition 104  
Cost [Member] | Construction in progress [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 3,726 12,193
Additions 4,816 19,233
Transfer to investment properties
Disposals
Reclassification of asset groups (3,707) (27,691)
Impact of foreign currency translation 226 (9)
Balance at Ending 13,203 3,726
Cost [Member] | Construction in progress [Member] | Adventus Mining Corporation [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Acquisition  
Cost [Member] | Construction in progress [Member] | Chaarat Zaav Cjsc [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Acquisition 8,142  
Accumulated amortization and impairment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning (101,985) (94,568)
Transfer to investment properties   27
Disposals 2,454 894
Depreciation and amortization (10,270) (8,747)
Impact of foreign currency translation (5,431) 409
Balance at Ending (115,232) (101,985)
Accumulated amortization and impairment [Member] | Land and buildings [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning (61,823) (57,541)
Transfer to investment properties   27
Disposals 494 121
Depreciation and amortization (5,699) (4,675)
Impact of foreign currency translation (3,282) 245
Balance at Ending (70,310) (61,823)
Accumulated amortization and impairment [Member] | Office equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning (8,519) (7,641)
Transfer to investment properties  
Disposals 825 100
Depreciation and amortization (1,060) (1,007)
Impact of foreign currency translation (417) 29
Balance at Ending (9,171) (8,519)
Accumulated amortization and impairment [Member] | Machinery [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning (25,945) (24,009)
Transfer to investment properties  
Disposals 705 366
Depreciation and amortization (2,792) (2,413)
Impact of foreign currency translation (1,427) 111
Balance at Ending (29,459) (25,945)
Accumulated amortization and impairment [Member] | Motor vehicles [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning (5,698) (5,377)
Transfer to investment properties  
Disposals 430 307
Depreciation and amortization (719) (652)
Impact of foreign currency translation (305) 24
Balance at Ending (6,292) (5,698)
Accumulated amortization and impairment [Member] | Construction in progress [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning
Transfer to investment properties  
Disposals
Depreciation and amortization
Impact of foreign currency translation
Balance at Ending
Carrying amounts [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 93,793  
Balance at Ending 108,510 93,793
Carrying amounts [Member] | Land and buildings [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 70,355  
Balance at Ending 74,884 70,355
Carrying amounts [Member] | Office equipment [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 4,069  
Balance at Ending 4,062 4,069
Carrying amounts [Member] | Machinery [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 13,566  
Balance at Ending 13,571 13,566
Carrying amounts [Member] | Motor vehicles [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 2,077  
Balance at Ending 2,790 2,077
Carrying amounts [Member] | Construction in progress [Member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Balance at beginning 3,726  
Balance at Ending $ 13,203 $ 3,726