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Reversal of Impairment (Table) | 12 Months Ended
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Dec. 31, 2017
Impairment Reversal [abstract] |
Schedule of Metal Prices Assumptions Used for Impairment Determination | For the year ended December 31, 2017, the Company's impairment testing incorporated the following key assumptions in addition to the increase in the estimated life of the mine: ﻿
| a) |  | Weighted average cost of capital
﻿ As at December 31, 2017, projected cash flows were discounted using a real after-tax discount rate of 4.1% which represented the estimated weighted average cost of capital. ﻿
| b) |  | Metal Price assumptions
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﻿Metal Price Assumptions |  | 2018 |  |  | 2019 |  |  | 2020 |  |  | 2021 |  |  | 2022 -2025
﻿Silver price ($ per ounce) | $ | 17.56 |  | $ | 18.44 |  | $ | 19.00 |  | $ | 19.00 |  | $ | 18.40
﻿Gold price ($ per ounce) | $ | 1,300 |  | $ | 1,300 |  | $ | 1,342 |  | $ | 1,325 |  | $ | 1,325
﻿Lead price ($ per tonne) | $ | 2,469 |  | $ | 2,403 |  | $ | 2,315 |  | $ | 2,205 |  | $ | 2,205
﻿Zinc price ($ per tonne) | $ | 3,175 |  | $ | 3,031 |  | $ | 2,756 |  | $ | 2,756 |  | $ | 2,425
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