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Commitments and Contingencies (Details) |  |  | 2 Months Ended | 8 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jul. 11, 2016 | Apr. 15, 2015 USD ($) | Apr. 20, 2017 | Feb. 21, 2017 | Dec. 31, 2017 USD ($) $ / pure | Sep. 30, 2011 | Dec. 31, 2017 USD ($) $ / pure shares tonne | Dec. 31, 2016 USD ($) | Dec. 31, 2014
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Number of shares issuable upon conversion of convertible debenture (shares) | shares |  |  |  |  |  |  | 363,854 |  |
Provisions |  |  |  |  | $ 65,400,000 |  | $ 65,400,000 | $ 55,600,000 |
Minimum finance lease payments payable, at present value |  |  |  |  | $ 7,559,000 |  | $ 7,559,000 | $ 7,101,000 |
Applicable tax rate (percent) |  |  |  |  |  |  | 26.00% | 26.00% |
Royalty expense |  |  |  |  |  |  | $ 24,510,000 | $ 31,608,000 |
Credit Facility [member] |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Line of credit, maximum borrowing capacity |  | $ 300,000,000 |  |  |  |  |  |  |
Credit facility term |  | 4 years |  |  |  |  |  |  |
Maverix Metals Inc. [member] |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate | 54.00% |  | 41.00% | 43.00% |  |  |  |  |
Adjustments for decrease (increase) in inventories, fully diluted |  |  |  |  | 40.00% |  |  |  |
Calcatreu project [member] | Maverix Metals Inc. [member] |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Net smelter returns royalty (percent) |  |  |  |  |  |  | 1.25% |  |
La Colorada mine [member] | Maverix Metals Inc. [member] |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Agreements to sell future gold production, percent of production (percent) |  |  |  |  |  |  | 100.00% |  |
Agreements to sell future gold production, price per ounce (in USD per ounce) |  |  |  |  | 650 |  | 650 |  |
La Bolsa mine [member] | Maverix Metals Inc. [member] |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Agreements to sell future gold production, percent of production (percent) |  |  |  |  |  |  | 5.00% |  |
Agreements to sell future silver production, price per ounce (in USD per ounce) |  |  |  |  | 450 |  | 450 |  |
Agreements to sell future gold production, price per ounce (in USD per ounce) |  |  |  |  | 450 |  | 450 |  |
Pico Machay project [member] | Maverix Metals Inc. [member] |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Net smelter returns royalty (percent) |  |  |  |  |  |  | 1.00% |  |
Dolores mine [member] |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Net smelter return royalties, silver production (percent) |  |  |  |  |  |  | 2.00% |  |
Net smelter return royalties, gold production (percent) |  |  |  |  |  |  | 3.25% |  |
MEXICO |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Applicable tax rate (percent) |  |  |  |  |  |  |  |  | 30.00%
Withholding tax on dividends paid to non-resident shareholders (percent) |  |  |  |  |  |  |  |  | 10.00%
Extraordinary mining duty (percent) |  |  |  |  |  |  |  |  | 0.50%
Special mining duty (percent) |  |  |  |  |  |  |  |  | 7.50%
PERU | Bottom of range [member] |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Royalty on operating profit (percent) |  |  |  |  |  |  | 1.00% |  |
Former royalties on net sales (percent) |  |  |  |  |  | 1.00% |  |  |
Former operating profit special tax rate (percent) |  |  |  |  |  | 2.00% |  |  |
Special contribution on operating profit (percent) |  |  |  |  |  |  | 4.00% |  |
PERU | Top of range [member] |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Royalty on operating profit (percent) |  |  |  |  |  |  | 12.00% |  |
Former royalties on net sales (percent) |  |  |  |  |  | 3.00% |  |  |
Former operating profit special tax rate (percent) |  |  |  |  |  | 8.40% |  |  |
Special contribution on operating profit (percent) |  |  |  |  |  |  | 13.12% |  |
PERU | up to $60 million [member] | Huaron and Morococha Mines [member] |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Royalty on sales (percent) |  |  |  |  |  |  | 1.00% |  |
Sales thresholds for royalty rates |  |  |  |  |  |  | $ 60,000,000 |  |
PERU | $60 million to $120 million [member] | Huaron and Morococha Mines [member] |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Royalty on sales (percent) |  |  |  |  |  |  | 2.00% |  |
PERU | $60 million to $120 million [member] | Bottom of range [member] | Huaron and Morococha Mines [member] |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Sales thresholds for royalty rates |  |  |  |  |  |  | $ 60,000,000 |  |
PERU | $60 million to $120 million [member] | Top of range [member] | Huaron and Morococha Mines [member] |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Sales thresholds for royalty rates |  |  |  |  |  |  | $ 120,000,000 |  |
PERU | greater than $120 million [member] | Huaron and Morococha Mines [member] |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Royalty on sales (percent) |  |  |  |  |  |  | 3.00% |  |
Sales thresholds for royalty rates |  |  |  |  |  |  | $ 120,000,000 |  |
ARGENTINA |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Provincial royalty on operating income (percent) |  |  |  |  |  |  | 3.00% |  |
Province of Santa Cruz [Member] | Manantial Espejo mine [member] |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Royalty on operating cash flow (percent) |  |  |  |  |  |  | 3.00% |  |
BOLIVIA | San Vicente mine [member] |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Royalty on gross metal value of sales (before smelting and refining deductions), silver (percent) |  |  |  |  |  |  | 6.00% |  |
Barrick Gold Corp. [member] | Manantial Espejo mine [member] |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Net smelter returns royalty (percent) |  |  |  |  |  |  | 0.50% |  |
Royalty expense per metric tonne (in USD per unit) |  |  |  |  |  |  | $ 0.60 |  |
Production cap for royalty charge (tonnes) | tonne |  |  |  |  |  |  | 1,000,000 |  |
COMIBOL [member] | BOLIVIA | San Vicente mine [member] |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Participation fee, as percentage of operation's cash flow (percent) |  |  |  |  |  |  | 37.50% |  |
Decrease in participation fee, as percentage of operation's cash flows |  |  |  |  |  |  | 75.00% |  |
Royalty expense |  |  |  |  |  |  | $ 8,474,000 | 14,341,000 |
EMUSA [member] | San Vicente mine [member] |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Royalty expense |  |  |  |  |  |  | $ 900,000 | 1,000,000 |
Net smelter return royalties, silver production (percent) |  |  |  |  |  |  | 2.00% |  |
Minimum average price per ounce of silver to trigger royalty (in USD per ounce) |  |  |  |  |  |  | $ 9.00 |  |
Bolivian Government [Member] | BOLIVIA | San Vicente mine [member] |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Royalty on gross metal value of sales (before smelting and refining deductions), zinc and copper (percent) |  |  |  |  |  |  | 5.00% |  |
Royalty expense |  |  |  |  |  |  | $ 5,000,000 | 5,600,000 |
Royal Gold Inc. [member] |  |  |  |  |  |  |  |  |
Disclosure of contingent liabilities [line items] |  |  |  |  |  |  |  |  |
Royalty expense |  |  |  |  |  |  | $ 5,500,000 | $ 5,300,000 |

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