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REVENUE - Narrative (Details) oz in Thousands, lb in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) lb oz $ / pound $ / ounce | Dec. 31, 2020 USD ($) | Dec. 31, 2019
Concentrate Metal Sales Agreement |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Embedded derivative, fair value of embedded derivative | $ | $ (1.0) | $ (1.5) |
Silver | Concentrate Metal Sales Agreement |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Notional ounce/tonnes | oz | 3,900 |  |
Average price per ounce/tonnes | $ / ounce | 23.49 |  |
Zinc | Concentrate Metal Sales Agreement |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Notional ounce/tonnes | lb | 6,330 |  |
Average price per ounce/tonnes | $ / pound | 1.46 |  |
Lead | Concentrate Metal Sales Agreement |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Notional ounce/tonnes | lb | 19,230 |  |
Average price per ounce/tonnes | $ / pound | 1.02 |  |
Customer Concentration Risk | Revenue Benchmark | Istanbul Gold Refinery | Gold Dore |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Concentration risk, percentage | 41.00% | 24.00% |
Customer Concentration Risk | Revenue Benchmark | CIBC | Gold Dore |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Concentration risk, percentage | 30.00% | 45.00% | 37.00%
Customer Concentration Risk | Revenue Benchmark | Bank of Montreal | Gold Dore |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Concentration risk, percentage |  | 14.00% | 17.00%
Customer Concentration Risk | Revenue Benchmark | Bank of Nova Scotia | Gold Dore |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Concentration risk, percentage |  |  | 22.00%

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