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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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