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Prepaid Sales (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 USD ($) oz | Dec. 31, 2018 USD ($) oz | Dec. 31, 2017 USD ($) oz
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Proceeds from prepaid sales |  | $ 0 | $ 30,000
Deferred revenue earned |  | $ 60,000 | $ 60,000
Gold and Silver Ores |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Prepaid sales volume delivered | oz |  | 51,633 | 51,633
Deferred revenue earned |  | $ 60,000 | $ 60,000
2016 Gold Delivery Contracts | Gold and Silver Ores |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Proceeds from prepaid sales | $ 120,000 |  |
Prepaid sales contract volume | oz | 103,266 |  |
2017 Gold Delivery Contract | Gold and Silver Ores |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Proceeds from prepaid sales |  |  | $ 30,000
Prepaid sales contract volume | oz |  |  | 25,282
2016 and 2017 Gold Delivery Contracts | Gold and Silver Ores |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Prepaid sales contract volume | oz |  | 25,282 |
Deferred income |  | $ 30,000 |

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