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Derivative Financial Instruments - Summary of Provisionally Priced Sales (Details) $ in Thousands | Dec. 31, 2019 USD ($) oz $ / oz
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Silver concentrate sales agreements | 2018 |
Derivative instruments Settlement |
Derivative, notional amount | $ (8,116)
Derivative average price | $ / oz | 17.89
Outstanding Provisionally Priced Sales Consists of Silver | oz | 453,610
Silver concentrate sales agreements | Thereafter |
Derivative instruments Settlement |
Derivative, notional amount | $ 0
Derivative average price | $ / oz | 0
Outstanding Provisionally Priced Sales Consists of Silver | oz | 0
Gold concentrates sales agreements | 2018 |
Derivative instruments Settlement |
Derivative, notional amount | $ (16,265)
Derivative average price | $ / oz | 1,471
Outstanding Provisionally Priced Sales Consists of Gold | oz | 11,054
Gold concentrates sales agreements | Thereafter |
Derivative instruments Settlement |
Derivative, notional amount | $ 0
Derivative average price | $ / oz | 0
Outstanding Provisionally Priced Sales Consists of Gold | oz | 0
Zinc concentrates sales agreements [Member] | 2018 |
Derivative instruments Settlement |
Derivative, notional amount | $ (10,762)
Derivative average price | $ / oz | 1.03
Outstanding Provisionally Priced Sales Consists of Gold | oz | 10,411,742
Zinc concentrates sales agreements [Member] | Thereafter |
Derivative instruments Settlement |
Derivative, notional amount | $ 0
Derivative average price | $ / oz | 0
Outstanding Provisionally Priced Sales Consists of Gold | oz | 0
Lead concentrates sales agreements [Member] | 2018 |
Derivative instruments Settlement |
Derivative, notional amount | $ (5,485)
Derivative average price | $ / oz | 0.88
Outstanding Provisionally Priced Sales Consists of Gold | oz | 6,205,968
Lead concentrates sales agreements [Member] | Thereafter |
Derivative instruments Settlement |
Derivative, notional amount | $ 0
Derivative average price | $ / oz | 0
Outstanding Provisionally Priced Sales Consists of Gold | oz | 0
Fixed Interest Rate Swap One |
Derivative instruments Settlement |
Derivative, notional amount | $ (50,000)
Fixed Interest Rate Swap Two |
Derivative instruments Settlement |
Derivative, notional amount | $ (75,000)

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