EQUITY METHOD INVESTMENTS - Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
EQUITY METHOD INVESTMENTS
Current assets	$ 107,886	$ 41,192
Total assets	820,218	664,623
Current liabilities	(63,809)	(47,693)
Total liabilities	(273,981)	(169,648)
Difference in proportionate share of net assets	199,100
Minera Santa Cruz S.A.
EQUITY METHOD INVESTMENTS
Difference in proportionate share of net assets	29,400
McEwen Copper Inc.
EQUITY METHOD INVESTMENTS
Current assets	7,089	34,067
Total assets	203,277	226,329
Current liabilities	(11,365)	(14,656)
Total liabilities	(41,759)	(14,856)
Minera Santa Cruz S.A.
EQUITY METHOD INVESTMENTS
Current assets	290,704	144,327
Total assets	372,994	233,003
Current liabilities	(107,930)	(57,373)
Total liabilities	$ (145,761)	$ (89,594)