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REVENUE - Narrative (Details) - Concentrate Metal Sales Agreement oz in Thousands, lb in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 USD ($) $ / pound $ / Ounce | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) lb oz $ / pound $ / Ounce | Jun. 30, 2021 USD ($)
Disaggregation of Revenue [Line Items] |  |  |  |
Embedded derivative, increase (decrease) of value | $ | $ (3.0) | $ 0.9 | $ 1.3 | $ 0.3
Silver |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Notional ounce/tonnes | oz |  |  | 3,470 |
Average price per ounce/tonnes | $ / Ounce | 23.18 |  | 23.18 |
Zinc |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Notional ounce/tonnes | lb |  |  | 2,310 |
Average price per ounce/tonnes | $ / pound | 1.50 |  | 1.50 |
Lead |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Notional ounce/tonnes | lb |  |  | 18,810 |
Average price per ounce/tonnes | $ / pound | 0.98 |  | 0.98 |

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