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PROPERTY, PLANT AND EQUIPMENT - Estimated Metal Prices (Details) - Pirquitas plant assets | May 31, 2017 $ / pound $ / ounce
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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
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
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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