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REVENUE - Narrative (Details) - Concentrate Metal Sales Agreement oz in Thousands, lb in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) $ / pound $ / Ounce	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) oz lb $ / pound $ / Ounce	Sep. 30, 2021 USD ($)
Disaggregation of Revenue [Line Items]
Embedded derivative, increase (decrease) of value | $	$ 1.3	$ (2.8)	$ 2.6	$ (2.5)
Silver
Disaggregation of Revenue [Line Items]
Notional ounce/tonnes | oz			3,670
Average price per ounce/tonnes | $ / Ounce	20.60		20.60
Zinc
Disaggregation of Revenue [Line Items]
Notional ounce/tonnes | lb			2,170
Average price per ounce/tonnes | $ / pound	1.48		1.48
Lead
Disaggregation of Revenue [Line Items]
Notional ounce/tonnes | lb			15,670
Average price per ounce/tonnes | $ / pound	0.88		0.88

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- Definition

The average forward price on the group of price risk forward or futures contracts, such as gas futures contracts.

+ References

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- Definition

Nominal mass used to calculate payments on a derivative instrument.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Net Increase or Decrease in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 15
-URI http://asc.fasb.org/subtopic&trid=2229187

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