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OPERATING SEGMENTS - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 USD ($) $ / ounce
Disclosure of operating segments [line items] |  |
Revenue (as a percent) | 100.00% | 100.00%
Puna |  |
Disclosure of operating segments [line items] |  |
Carrying value | $ |  | $ 141.9
Silver |  |
Disclosure of operating segments [line items] |  |
Revenue (as a percent) | 10.00% | 19.00%
Silver | Puna |  |
Disclosure of operating segments [line items] |  |
Discounted cash flow, price per ounce (usd per oz) | $ / ounce |  | 17.81
Discount rate applied to cash flow projections |  | 9.30%
Sensitivity of changing the silver price |  | 15.00%
Customer One | Marigold and Seabee |  |
Disclosure of operating segments [line items] |  |
Revenue (as a percent) | 45.00% | 37.00%
Customer One | Copler |  |
Disclosure of operating segments [line items] |  |
Revenue (as a percent) | 24.00% | 0.00%
Customer Two | Marigold and Seabee |  |
Disclosure of operating segments [line items] |  |
Revenue (as a percent) | 14.00% | 17.00%

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