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REVENUE - Narrative (Details) - Concentrate Metal Sales Agreement oz in Thousands, lb in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) lb oz $ / pound $ / Ounce	Mar. 31, 2021 USD ($)
Disaggregation of Revenue [Line Items]
Embedded derivative, increase (decrease) of value | $	$ 4.2	$ (0.6)
Silver
Disaggregation of Revenue [Line Items]
Notional ounce/tonnes | oz	3,540
Average price per ounce/tonnes | $ / Ounce	24.17
Zinc
Disaggregation of Revenue [Line Items]
Notional ounce/tonnes | lb	4,060
Average price per ounce/tonnes | $ / pound	1.78
Lead
Disaggregation of Revenue [Line Items]
Notional ounce/tonnes | lb	19,530
Average price per ounce/tonnes | $ / pound	1.06

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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

No definition available.

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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.

+ References

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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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