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Derivative Financial Instruments (Details) $ in Thousands | Jun. 30, 2017 USD ($) oz $ / oz
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Silver concentrate sales agreements [Member] | 2016 [Member] |
Derivative instruments Settlement |
Derivative, notional amount | $ | $ 1,994
Derivative average price | $ / oz | 16.85
Outstanding Provisionally Priced Sales Consists of Silver | oz | 118,361
Silver concentrate sales agreements [Member] | Thereafter [Member] |
Derivative instruments Settlement |
Derivative, notional amount | $ | $ 0
Derivative average price | $ / oz | 0.00
Notional ounces | oz | 0
Gold concentrates sales agreements [Member] | 2016 [Member] |
Derivative instruments Settlement |
Derivative, notional amount | $ | $ 41,176
Derivative average price | $ / oz | 1,262.67
Outstanding Provisionally Priced Sales Consists of Gold | oz | 32,602
Gold concentrates sales agreements [Member] | Thereafter [Member] |
Derivative instruments Settlement |
Derivative, notional amount | $ | $ 0
Derivative average price | $ / oz | 0.00
Notional ounces | oz | 0

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