EQUITY METHOD INVESTMENTS - Assets and Liabilities associated with McEwen Copper and MSC (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
EQUITY METHOD INVESTMENTS
Current assets	$ 106,399	$ 41,192
Total assets	730,597	664,623
Current liabilities	(45,255)	(47,693)
Total liabilities	(250,760)	(169,648)
Difference in proportionate share of net assets	199,700
McEwen Copper
EQUITY METHOD INVESTMENTS
Difference in proportionate share of net assets	31,000
McEwen Copper
EQUITY METHOD INVESTMENTS
Current assets	9,241	34,067
Total assets	204,261	226,329
Current liabilities	(11,085)	(14,656)
Total liabilities	(11,260)	(14,856)
Minera Santa Cruz S.A.
EQUITY METHOD INVESTMENTS
Current assets	132,312	144,327
Total assets	285,316	233,003
Current liabilities	(48,076)	(57,373)
Total liabilities	$ (81,060)	$ (89,594)