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Significant Accounting Policies (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Significant Accounting Policies [line items] |  |  |
Variation potential percentage benchmark | 25.00% |  |
Confidence percentage related to inferred tonnes, grade, metal content recoverability | 95.00% |  |
Inferred recoverability of resources percentage, benchmark | 75.00% |  |
Bottom of range [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Conversion factors related to inferred resources | 80.00% |  |
Top of range [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Conversion factors related to inferred resources | 87.00% |  |
Machinery and Equipment [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Depreciation method, property, plant and equipment | Straight line |  |
Useful lives or depreciation rates, property, plant and equipment | 3-15 years |  |
Spare Parts and Components [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Useful lives or depreciation rates, property, plant and equipment | 8 to 18 months |  |
Mineral Properties [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Depreciation method, property, plant and equipment | Declining balance |  |
San Jose M&I Property [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Conversion factors related to inferred resources | 90.00% |  |
Percentage of inferred resources | 23.00% | 28.00% | 53.00%
Caylloma M&I Property [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Percentage of inferred resources | 60.00% | 38.00% | 33.00%
Restricted Share Units [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Vesting period | 3 years |  |
Description of vesting requirements for share-based payment arrangement | RSUs are settled in either cash or equity, as determined by the Company's Board of Directors at the grant date and typically vest over three years, in tranches of 20%, 30%, and 50% |  |
Restricted Share Units [member] | Vesting Tranche One Period [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Vesting tranche percentage sharebased arrangements | 20.00% |  |
Restricted Share Units [member] | Vesting Tranche Two Period [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Vesting tranche percentage sharebased arrangements | 30.00% |  |
Restricted Share Units [member] | Vesting Tranche Three Period [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Vesting tranche percentage sharebased arrangements | 50.00% |  |
Performance Share Units [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Vesting period | 3 years |  |
Description of vesting requirements for share-based payment arrangement | Performance Share Units ("PSUs") are performance-based awards for the achievement of specified performance metrics by specified deadlines, which are settled in cash and vest over a three-year period in tranches of 20%, 30% and 50%. |  |
Performance Share Units [member] | Vesting Tranche One Period [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Vesting tranche percentage sharebased arrangements | 20.00% |  |
Performance Share Units [member] | Vesting Tranche Two Period [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Vesting tranche percentage sharebased arrangements | 30.00% |  |
Performance Share Units [member] | Vesting Tranche Three Period [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Vesting tranche percentage sharebased arrangements | 50.00% |  |

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