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Derivative Financial Instruments - Summary of Provisionally Priced Sales (Details) $ in Thousands | Mar. 31, 2020 USD ($) oz $ / oz
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Silver concentrate sales agreements | 2018 |
Derivative instruments Settlement |
Derivative average price | $ / oz | 14.86
Outstanding Provisionally Priced Sales Consists of Silver | oz | 302,871
Notional Amount Derivative | $ | $ 4,500
Silver concentrate sales agreements | Thereafter |
Derivative instruments Settlement |
Derivative average price | $ / oz | 0
Outstanding Provisionally Priced Sales Consists of Silver | oz | 0
Notional Amount Derivative | $ | $ 0
Gold concentrates sales agreements | 2018 |
Derivative instruments Settlement |
Derivative average price | $ / oz | 1,596
Notional Amount Derivative | $ | $ 8,346
Outstanding Provisionally Priced Sales Consists of Gold | oz | 5,230
Gold concentrates sales agreements | Thereafter |
Derivative instruments Settlement |
Derivative average price | $ / oz | 0
Notional Amount Derivative | $ | $ 0
Outstanding Provisionally Priced Sales Consists of Gold | oz | 0
Zinc concentrates sales agreements [Member] | 2018 |
Derivative instruments Settlement |
Derivative average price | $ / oz | 0.86
Notional Amount Derivative | $ | $ 11,769
Outstanding Provisionally Priced Sales Consists of Gold | oz | 13,615,188
Zinc concentrates sales agreements [Member] | Thereafter |
Derivative instruments Settlement |
Derivative average price | $ / oz | 0
Notional Amount Derivative | $ | $ 0
Outstanding Provisionally Priced Sales Consists of Gold | oz | 0
Lead concentrates sales agreements [Member] | 2018 |
Derivative instruments Settlement |
Derivative average price | $ / oz | 0.79
Notional Amount Derivative | $ | $ 3,028
Outstanding Provisionally Priced Sales Consists of Gold | oz | 3,830,017
Lead concentrates sales agreements [Member] | Thereafter |
Derivative instruments Settlement |
Derivative average price | $ / oz | 0
Notional Amount Derivative | $ | $ 0
Outstanding Provisionally Priced Sales Consists of Gold | oz | 0

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