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EQUITY METHOD INVESTMENTS - Summary of the operating results of Minera Santa Cruz S.A. (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
EQUITY METHOD INVESTMENTS          
Revenue from gold and silver sales $ 59,234 $ 46,700 $ 133,283 $ 82,396  
Depreciation and depletion (8,009) (6,686) (14,919) (12,707)  
Other expenses (1,441) 7,050 (7,941) 8,627  
Income (loss) before income and mining taxes 5,790 1,929 38,995 (5,420)  
Net income (loss) 9,606 3,040 42,985 (3,230)  
Income tax recovery (expense) 3,816 1,111 3,990 2,190  
Minera Santa Cruz S.A.          
EQUITY METHOD INVESTMENTS          
Net income 17,483 4,109 50,435 5,182 $ 43,256
Amortization of fair value increments (181) (523) (380) (1,091) (2,160)
Income tax recovery (expense) 4 10 2 15 $ 29
Income from investment in MSC, net of amortization $ 17,306 $ 3,596 $ 50,057 $ 4,106  
Minera Santa Cruz S.A.          
EQUITY METHOD INVESTMENTS          
Subsidiary (as a percent) 100.00% 100.00% 100.00% 100.00%  
Revenue from gold and silver sales $ 133,409 $ 94,886 $ 319,222 $ 166,789  
Production costs applicable to sales (77,036) (63,603) (154,691) (120,191)  
Depreciation and depletion (8,031) (10,612) (15,927) (21,222)  
Gross profit 48,342 20,671 148,604 25,376  
Exploration (5,716) (2,915) (10,057) (5,215)  
Other expenses (4,459) (4,521) (1,859) (3,695)  
Income (loss) before income and mining taxes 38,167 13,235 136,688 16,466  
Current and deferred taxes (2,488) (4,850) (33,759) (5,891)  
Net income (loss) $ 35,679 $ 8,385 $ 102,929 $ 10,575