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PROPERTY, PLANT AND EQUIPMENT - Estimated Metal Prices (Details) | Dec. 31, 2018 | May 31, 2017 $ / pound $ / ounce
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Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Discount rate used in current measurement of fair value | 10.00% |
Pirquitas plant assets | Silver |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Price per ounce, 2017 (usd per oz) | $ / ounce |  | 17.93
Price per ounce, 2018 (usd per oz) | $ / ounce |  | 18.72
Price per ounce, 2019 (usd per oz) | $ / ounce |  | 19.14
Price per ounce, 2020 (usd per oz) | $ / ounce |  | 19.53
Price per ounce, Long-term (usd per oz) | $ / ounce |  | 19.65
Pirquitas plant assets | Lead |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Price per pound, 2017 (usd per lb) |  | 1.01
Price per pound, 2018 (usd per lb) |  | 1.03
Price per pound, 2019 (usd per lb) |  | 1.02
Price per pound, 2020 (usd per lb) |  | 0.99
Price per pound, Long-term (usd per lb) |  | 0.94
Pirquitas plant assets | Zinc |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |
Price per pound, 2017 (usd per lb) |  | 1.27
Price per pound, 2018 (usd per lb) |  | 1.31
Price per pound, 2019 (usd per lb) |  | 1.24
Price per pound, 2020 (usd per lb) |  | 1.18
Price per pound, Long-term (usd per lb) |  | 1.06

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