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REVENUE - Narrative (Details) - Concentrate Metal Sales Agreement oz in Millions, lb in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($) $ / ounce $ / pound	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) lb oz $ / ounce $ / pound	Jun. 30, 2024 USD ($)
Disaggregation of Revenue [Line Items]
Embedded derivative, increase of value | $	$ 2.0	$ 5.7	$ 3.6	$ 3.2
Silver
Disaggregation of Revenue [Line Items]
Notional ounce/pound | oz			5.1
Average price per ounce/pound (in dollars per ounce/pound) | $ / ounce	33.97		33.97
Lead
Disaggregation of Revenue [Line Items]
Notional ounce/pound | lb			24.8
Average price per ounce/pound (in dollars per ounce/pound) | $ / pound	0.89		0.89
Zinc
Disaggregation of Revenue [Line Items]
Notional ounce/pound | lb			1.6
Average price per ounce/pound (in dollars per ounce/pound) | $ / pound	1.22		1.22

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