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REVENUE - Revenue by Metal (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 385,839	$ 257,356	$ 1,107,912	$ 672,431
Gold
Disaggregation of Revenue [Line Items]
Revenue	260,074	159,578	790,895	439,772
Silver
Disaggregation of Revenue [Line Items]
Revenue	107,962	80,845	270,447	189,455
Lead
Disaggregation of Revenue [Line Items]
Revenue	12,638	12,964	35,119	33,333
Zinc
Disaggregation of Revenue [Line Items]
Revenue	1,282	754	3,160	2,993
Other
Disaggregation of Revenue [Line Items]
Revenue	$ 3,883	$ 3,215	$ 8,291	$ 6,878

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