v3.26.1
Segment Reporting (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Segment Reporting Information [Line Items]      
Revenue $ 856,192 $ 360,062  
Amortization 99,825 43,093  
General and administrative 21,662 13,912  
Pre-development, reclamation, and other 29,827 16,953  
Income from operations 349,170 62,156  
Other, net 7,542 406  
Income (loss) before income and mining taxes 348,715 51,766  
Total assets for reportable segments 14,004,619   $ 3,928,905
Payments to Acquire Productive Assets 74,079 50,002  
Operating Segments      
Segment Reporting Information [Line Items]      
Amortization     43,093
General and administrative 21,662   13,912
Pre-development, reclamation, and other 29,827   16,953
Income from operations 349,170   62,156
Other, net (455)   (10,390)
Income (loss) before income and mining taxes 348,715   51,766
Total assets for reportable segments 14,004,619   3,898,776
Payments to Acquire Productive Assets 74,079   50,002
New Afton | Operating Segments      
Segment Reporting Information [Line Items]      
Amortization 14,214    
General and administrative (57)    
Pre-development, reclamation, and other 896    
Income from operations (13,765)    
Other, net 953    
Income (loss) before income and mining taxes (12,812)    
Total assets for reportable segments 6,142,244    
Payments to Acquire Productive Assets 0    
Rainy River | Operating Segments      
Segment Reporting Information [Line Items]      
Amortization 16,689    
General and administrative 107    
Pre-development, reclamation, and other 2,085    
Income from operations (15,343)    
Other, net 2,593    
Income (loss) before income and mining taxes (12,750)    
Total assets for reportable segments 3,861,754    
Payments to Acquire Productive Assets 6,418    
Las Chispas | Operating Segments      
Segment Reporting Information [Line Items]      
Amortization 35,319   8,936
General and administrative 415   10
Other operating expenses 213    
Pre-development, reclamation, and other 213   57
Income from operations 122,728   4,304
Other, net 4,357   411
Income (loss) before income and mining taxes 127,085   4,715
Total assets for reportable segments 1,650,275   1,717,053
Payments to Acquire Productive Assets 12,530   5,338
Palmarejo | Operating Segments      
Segment Reporting Information [Line Items]      
Amortization 6,789   9,181
General and administrative 352   494
Other operating expenses 808    
Pre-development, reclamation, and other 808   1,135
Income from operations 124,454   37,433
Other, net (61)   (673)
Income (loss) before income and mining taxes 124,393   36,760
Total assets for reportable segments 309,799   312,023
Payments to Acquire Productive Assets 8,508   5,857
Rochester | Operating Segments      
Segment Reporting Information [Line Items]      
Amortization 16,043   14,907
General and administrative 387   324
Other operating expenses 2,225    
Pre-development, reclamation, and other 2,225   2,430
Income from operations 108,037   14,962
Other, net (948)   (2,692)
Income (loss) before income and mining taxes 107,089   12,270
Total assets for reportable segments 1,318,073   1,229,683
Payments to Acquire Productive Assets 22,832   14,853
Kensington | Operating Segments      
Segment Reporting Information [Line Items]      
Amortization 8,669   7,471
General and administrative 351   290
Other operating expenses 107    
Pre-development, reclamation, and other 107   280
Income from operations 49,383   11,745
Other, net (116)   (262)
Income (loss) before income and mining taxes 49,267   11,483
Total assets for reportable segments 271,746   233,190
Payments to Acquire Productive Assets 9,137   15,473
Wharf | Operating Segments      
Segment Reporting Information [Line Items]      
Amortization 893   1,474
General and administrative 316   262
Other operating expenses 669    
Pre-development, reclamation, and other 669   926
Income from operations 27,805   26,040
Other, net (74)   (141)
Income (loss) before income and mining taxes 27,731   25,899
Total assets for reportable segments 150,276   124,776
Payments to Acquire Productive Assets 13,075   7,364
Silvertip | Operating Segments      
Segment Reporting Information [Line Items]      
Amortization 956   946
General and administrative 0   0
Other operating expenses 3,727    
Pre-development, reclamation, and other 3,727   3,078
Income from operations (13,918)   (10,131)
Other, net (177)   97
Income (loss) before income and mining taxes (14,095)   (10,034)
Total assets for reportable segments 220,056   219,103
Payments to Acquire Productive Assets 1,579   854
Other Mining Properties | Operating Segments      
Segment Reporting Information [Line Items]      
Amortization 253   178
General and administrative 19,791   12,532
Other operating expenses 19,097    
Pre-development, reclamation, and other 19,097   9,047
Income from operations (40,211)   (22,197)
Other, net (6,982)   (7,130)
Income (loss) before income and mining taxes (47,193)   (29,327)
Total assets for reportable segments 80,396   62,948
Payments to Acquire Productive Assets 0   263
Gold sales | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 475,222   235,327
Gold sales | New Afton | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 18,487    
Gold sales | Rainy River | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 94,216    
Gold sales | Las Chispas | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 72,365   27,882
Gold sales | Palmarejo | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 64,478   43,695
Gold sales | Rochester | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 68,240   41,783
Gold sales | Kensington | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 108,819   65,207
Gold sales | Wharf | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 48,617   56,760
Gold sales | Silvertip | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 0   0
Gold sales | Other Mining Properties | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 0   0
Silver sales | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 362,198   124,735
Silver sales | New Afton | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 556    
Silver sales | Rainy River | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 2,203    
Silver sales | Las Chispas | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 121,266   30,137
Silver sales | Palmarejo | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 123,782   52,111
Silver sales | Rochester | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 113,164   40,843
Silver sales | Kensington | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue (23)   36
Silver sales | Wharf | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 1,250   1,608
Silver sales | Silvertip | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 0   0
Silver sales | Other Mining Properties | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 0   0
Metal sales | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 856,192   360,062
Metal sales | New Afton | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 37,815    
Metal sales | Rainy River | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 96,419    
Metal sales | Las Chispas | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 193,631   58,019
Metal sales | Palmarejo | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 188,260   95,806
Metal sales | Rochester | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 181,404   82,626
Metal sales | Kensington | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 108,796   65,243
Metal sales | Wharf | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 49,867   58,368
Metal sales | Silvertip | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 0   0
Metal sales | Other Mining Properties | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 0   0
Product      
Segment Reporting Information [Line Items]      
Costs applicable to sales [1] 330,009 204,266  
Product | Operating Segments      
Segment Reporting Information [Line Items]      
Costs applicable to sales [1]     204,266
Product | New Afton | Operating Segments      
Segment Reporting Information [Line Items]      
Costs applicable to sales [1] 36,239    
Product | Rainy River | Operating Segments      
Segment Reporting Information [Line Items]      
Costs applicable to sales [1] 92,444    
Product | Las Chispas | Operating Segments      
Segment Reporting Information [Line Items]      
Costs applicable to sales [1] 31,458   42,834
Product | Palmarejo | Operating Segments      
Segment Reporting Information [Line Items]      
Costs applicable to sales [1] 51,248   43,703
Product | Rochester | Operating Segments      
Segment Reporting Information [Line Items]      
Costs applicable to sales [1] 53,783   48,536
Product | Kensington | Operating Segments      
Segment Reporting Information [Line Items]      
Costs applicable to sales [1] 47,813   42,156
Product | Wharf | Operating Segments      
Segment Reporting Information [Line Items]      
Costs applicable to sales [1] 17,024   27,037
Product | Silvertip | Operating Segments      
Segment Reporting Information [Line Items]      
Costs applicable to sales [1] 0   0
Product | Other Mining Properties | Operating Segments      
Segment Reporting Information [Line Items]      
Costs applicable to sales [1] 0   0
Mineral, Exploration      
Segment Reporting Information [Line Items]      
Costs applicable to sales 25,699 $ 19,682  
Mineral, Exploration | Operating Segments      
Segment Reporting Information [Line Items]      
Costs applicable to sales     19,682
Mineral, Exploration | New Afton | Operating Segments      
Segment Reporting Information [Line Items]      
Costs applicable to sales 288    
Mineral, Exploration | Rainy River | Operating Segments      
Segment Reporting Information [Line Items]      
Costs applicable to sales 437    
Mineral, Exploration | Las Chispas | Operating Segments      
Segment Reporting Information [Line Items]      
Costs applicable to sales 3,498   1,878
Mineral, Exploration | Palmarejo | Operating Segments      
Segment Reporting Information [Line Items]      
Costs applicable to sales 4,609   3,860
Mineral, Exploration | Rochester | Operating Segments      
Segment Reporting Information [Line Items]      
Costs applicable to sales 929   1,467
Mineral, Exploration | Kensington | Operating Segments      
Segment Reporting Information [Line Items]      
Costs applicable to sales 2,473   3,301
Mineral, Exploration | Wharf | Operating Segments      
Segment Reporting Information [Line Items]      
Costs applicable to sales 3,160   2,629
Mineral, Exploration | Silvertip | Operating Segments      
Segment Reporting Information [Line Items]      
Costs applicable to sales 9,235   6,107
Mineral, Exploration | Other Mining Properties | Operating Segments      
Segment Reporting Information [Line Items]      
Costs applicable to sales 1,070   $ 440
Product, Copper | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 18,772    
Product, Copper | New Afton | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 18,772    
Product, Copper | Rainy River | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 0    
Product, Copper | Las Chispas | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 0    
Product, Copper | Palmarejo | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 0    
Product, Copper | Rochester | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 0    
Product, Copper | Kensington | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 0    
Product, Copper | Wharf | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 0    
Product, Copper | Silvertip | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue 0    
Product, Copper | Other Mining Properties | Operating Segments      
Segment Reporting Information [Line Items]      
Revenue $ 0    
[1] Excludes amortization.