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Significant Accounting Policies (Narrative) (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Apr. 20, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Significant Accounting Policies [line items] |  |  |
Lease liabilities |  | $ 19,497,000 | $ 23,879,000
Sales (note 23) |  | 278,966,000 | 257,187,000
Cost of sales (note 24) |  | $ 168,745,000 | $ 172,606,000
Machinery and Equipment [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Depreciation method, property, plant and equipment |  | Straight line |
Machinery and Equipment [member] | Bottom of range [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Useful life measured as period of time, property, plant and equipment |  | 3 years |
Machinery and Equipment [member] | Top of range [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Useful life measured as period of time, property, plant and equipment |  | 12 years |
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% | 90.00%
Percentage of inferred resources |  | 35.00% | 29.00%
Cost of sales (note 24) |  | $ 104,315,000 | $ 114,156,000
Caylloma M&I Property [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Conversion factors related to inferred resources |  | 80.00% | 80.00%
Percentage of inferred resources |  | 52.00% | 45.00%
Cost of sales (note 24) |  | $ 54,357,000 | $ 58,450,000
Restricted Share Units | Vesting Tranche One Period [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Vesting tranche percentage sharebased arrangements | 20.00% |  |
Restricted Share Units | Vesting Tranche Two Period [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Vesting tranche percentage sharebased arrangements | 30.00% |  |
Restricted Share Units | Vesting Tranche Three Period [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Vesting tranche percentage sharebased arrangements | 50.00% |  |
Performance Share Units |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
vesting period |  | 3 years |
Performance Share Units | Bottom of range [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Vesting tranche percentage sharebased arrangements |  |  | 50.00%
Performance Share Units | Top of range [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Vesting tranche percentage sharebased arrangements |  |  | 200.00%
Performance Share Units | Vesting Tranche One Period [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Vesting tranche percentage sharebased arrangements |  |  | 20.00%
Performance Share Units | Vesting Tranche Two Period [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Vesting tranche percentage sharebased arrangements |  |  | 30.00%
Performance Share Units | Vesting Tranche Three Period [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Vesting tranche percentage sharebased arrangements |  |  | 50.00%
Increase (decrease) due to voluntary changes in accounting policy [member] | Lindero Reporting Segment [member] |  |  |
Disclosure Of Significant Accounting Policies [line items] |  |  |
Sales (note 23) |  | $ 20,297,000 | $ 0
Cost of sales (note 24) |  | $ 10,073,000 | $ 0

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