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Reversal of Impairment and Goodwill - Key Assumptions and Sensitivity Analysis (Details) | 12 Months Ended
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Dec. 31, 2017 $ / pure $ / tonne $ / Ounce | Dec. 31, 2016 $ / tonne $ / Ounce
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Weighted average cost of capital, significant unobservable inputs, assets | 5.20% | 6.40%
Bottom of range [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Discount rate applied to cash flow projections | 4.00% | 5.00%
Top of range [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Discount rate applied to cash flow projections | 9.00% | 9.00%
Silver, Ounces |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Metal prices used to calculate recoverable amounts | $ / Ounce | 18.50 | 18.50
Silver, Ounces | Weighted average [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Metal prices used to calculate recoverable amounts | $ / Ounce | 18.57 | 19.93
Gold, Ounces |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Metal prices used to calculate recoverable amounts | $ / Ounce | 1,300 | 1,300
Gold, Ounces | Weighted average [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Metal prices used to calculate recoverable amounts | $ / Ounce | 1,307 | 1,327
Zinc [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Metal prices used to calculate recoverable amounts | 2,600 | 2,200
Zinc [member] | Weighted average [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Metal prices used to calculate recoverable amounts | 2,818 | 2,567
Copper [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Metal prices used to calculate recoverable amounts | 5,500 | 5,000
Copper [member] | Weighted average [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Metal prices used to calculate recoverable amounts | 6,742 | 5,725
Lead [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Metal prices used to calculate recoverable amounts | 2,200 | 2,000
Lead [member] | Weighted average [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Metal prices used to calculate recoverable amounts | 2,251 | 2,142
Option contract [member] | Zinc [member] | Bottom of range [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Metal prices used to calculate recoverable amounts | 2,609 |
Option contract [member] | Zinc [member] | Top of range [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Metal prices used to calculate recoverable amounts | 3,555 |
Option contract [member] | Copper [member] | Bottom of range [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Metal prices used to calculate recoverable amounts | 6,222 |
Option contract [member] | Copper [member] | Top of range [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Metal prices used to calculate recoverable amounts | 7,277 |
Option contract [member] | Lead [member] | Bottom of range [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Metal prices used to calculate recoverable amounts | 2,200 |
Option contract [member] | Lead [member] | Top of range [member] |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Metal prices used to calculate recoverable amounts | 2,679 |

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