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REVENUE - Narrative (Details) - Concentrate Metal Sales Agreement oz in Millions, lb in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($) $ / pound $ / ounce	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) lb oz $ / pound $ / ounce	Sep. 30, 2024 USD ($)
Disaggregation of Revenue [Line Items]
Embedded derivative, increase of value | $	$ 3.5	$ 3.2	$ 7.1	$ 6.4
Silver
Disaggregation of Revenue [Line Items]
Notional ounce/pound | oz			5.3
Average price per ounce/pound (in dollars per ounce/pound) | $ / ounce	38.28		38.28
Lead
Disaggregation of Revenue [Line Items]
Notional ounce/pound | lb			25.2
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			1.9
Average price per ounce/pound (in dollars per ounce/pound) | $ / pound	1.23		1.23

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