v3.26.1
Mineral Rights and Properties - Schedule of Producing Properties (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mineral Rights and Properties - Schedule of Producing Properties (Details) [Line Items]    
Carrying amounts $ 779,730 $ 586,982
Producing Mineral Properties [Member]    
Mineral Rights and Properties - Schedule of Producing Properties (Details) [Line Items]    
Beginning balance 332,631  
Carrying amounts 386,830 332,631
Ending balance 386,830 332,631
Producing Mineral Properties [Member] | Ying Mining District [Member]    
Mineral Rights and Properties - Schedule of Producing Properties (Details) [Line Items]    
Beginning balance 294,310  
Ending balance 342,944 294,310
Producing Mineral Properties [Member] | GC [Member]    
Mineral Rights and Properties - Schedule of Producing Properties (Details) [Line Items]    
Beginning balance 38,321  
Ending balance 43,886 38,321
Carrying Values [Member] | Producing Mineral Properties [Member]    
Mineral Rights and Properties - Schedule of Producing Properties (Details) [Line Items]    
Beginning balance 602,844 547,117
Capitalized expenditures 62,091 54,332
Environmental rehabilitation 796 3,929
Foreign currency translation impact 33,147 (2,534)
Ending balance 698,878 602,844
Carrying Values [Member] | Producing Mineral Properties [Member] | Ying Mining District [Member]    
Mineral Rights and Properties - Schedule of Producing Properties (Details) [Line Items]    
Beginning balance 476,652 426,560
Capitalized expenditures 56,133 48,210
Environmental rehabilitation 796 3,896
Foreign currency translation impact 26,466 (2,014)
Ending balance 560,047 476,652
Carrying Values [Member] | Producing Mineral Properties [Member] | GC [Member]    
Mineral Rights and Properties - Schedule of Producing Properties (Details) [Line Items]    
Beginning balance 126,192 120,557
Capitalized expenditures 5,958 6,122
Environmental rehabilitation   33
Foreign currency translation impact 6,681 (520)
Ending balance 138,831 126,192
Accumulated Depletion and Impairment[Member] | Producing Mineral Properties [Member]    
Mineral Rights and Properties - Schedule of Producing Properties (Details) [Line Items]    
Beginning balance (270,213) (247,805)
Depletion (27,031) (23,546)
Foreign currency translation impact (14,804) 1,138
Ending balance (312,048) (270,213)
Accumulated Depletion and Impairment[Member] | Producing Mineral Properties [Member] | Ying Mining District [Member]    
Mineral Rights and Properties - Schedule of Producing Properties (Details) [Line Items]    
Beginning balance (182,342) (161,657)
Depletion (24,549) (21,464)
Foreign currency translation impact (10,212) 779
Ending balance (217,103) (182,342)
Accumulated Depletion and Impairment[Member] | Producing Mineral Properties [Member] | GC [Member]    
Mineral Rights and Properties - Schedule of Producing Properties (Details) [Line Items]    
Beginning balance (87,871) (86,148)
Depletion (2,482) (2,082)
Foreign currency translation impact (4,592) 359
Ending balance $ (94,945) $ (87,871)