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Financial Instruments - Additional Information (Details) S/ / shares in Units, $ / shares in Units, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) buyer refinery | Dec. 31, 2020 MXN ($) buyer refinery | Dec. 31, 2020 PEN (S/) buyer refinery | Dec. 31, 2020 CAD ($) buyer refinery | Dec. 31, 2019 USD ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2019 PEN (S/) | Dec. 31, 2019 CAD ($) | Dec. 31, 2020 MXN ($) $ / shares | Dec. 31, 2020 PEN (S/) S/ / shares | Sep. 30, 2020 USD ($) | Jul. 31, 2020 USD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Trade and other receivables | $ 127,756,000 |  |  |  | $ 168,753,000 |  |  |  |  |  |  |
Value contained in precious metal inventory at refineries | 430,546,000 |  |  |  | 370,716,000 |  |  |  |  |  |  |
Gains (losses) on derivative contracts | $ 3,543,000 |  |  |  | $ 3,315,000 |  |  |  |  |  |  |
Interest earned on cash and short-term investments (percent) | 0.90% | 0.90% | 0.90% | 0.90% | 0.60% | 0.60% | 0.60% | 0.60% |  |  |  |
Impact of 10% change in interest earned on earnings before taxes | $ 100,000 |  |  |  | $ 100,000 |  |  |  |  |  |  |
Outstanding debt | 0 |  |  |  | 275,000,000 |  |  |  |  |  |  |
Minimum finance lease payments payable, at present value | 33,565,000 |  |  |  | 41,208,000 |  |  |  |  |  |  |
Impact of 10% increase in metal prices on revenues | 138,000,000 |  |  |  | 139,100,000 |  |  |  |  |  |  |
Impact of 10% decrease in metal prices on revenues | 138,200,000 |  |  |  | 140,100,000 |  |  |  |  |  |  |
Impact of 10% increase in metal prices on earnings before taxes | 4,600,000 |  |  |  | 6,400,000 |  |  |  |  |  |  |
Impact of 10% decrease in metal prices on earnings before taxes | 4,600,000 |  |  |  | 6,400,000 |  |  |  |  |  |  |
Dore [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Value contained in precious metal inventory at refineries | 77,489,000 |  |  |  | 67,820,000 |  |  |  |  |  |  |
Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Amount borrowed |  |  |  |  |  |  |  |  |  |  | $ 2,800,000 | $ 2,800,000
Loans outstanding | 0.0 |  |  |  |  |  |  |  |  |  |  |
Credit Facility [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Loans outstanding | 0 |  |  |  | 275,000,000 |  |  |  |  |  |  |
Production Concentration Risk [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Value contained in precious metal inventory at refineries | $ 61,800,000 |  |  |  | 58,200,000 |  |  |  |  |  |  |
Production Concentration Risk [member] | Dore [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Number of separate refineries worldwide | refinery | 5 | 5 | 5 | 5 |  |  |  |  |  |  |  |
Credit risk [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Current advances to suppliers | $ 8,186,000 |  |  |  | 3,391,000 |  |  |  |  |  |  |
Currency risk [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Outstanding positions in foreign currency exposure |  |  |  |  |  |  |  |  | $ 51.0 | S/ 45,600,000 |  |
Put rate | (per share) |  |  |  |  |  |  |  |  | $ 21.29 | S/ 3.50 |  |
Gains (losses) on derivative contracts |  | $ 1.6 | S/ (2,200,000) | $ (600,000) |  | $ 1.0 | S/ 700,000 | $ 300,000 |  |  |  |
Effect of 10% change in exchange rate on income before taxes | $ 9,200,000 |  |  |  | $ 6,900,000 |  |  |  |  |  |  |
Interest rate risk [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted averate rate on lease liabilities | 9.30% |  |  |  | 9.70% |  |  |  | 9.30% | 9.30% |  |
Diesel Fuel Swaps Price Risk [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Gain on derivatives | $ 4,700,000 |  |  |  |  |  |  |  |  |  |  |
Gain on derivatives | 4,700,000 |  |  |  |  |  |  |  |  |  |  |
Trade receivables from provisional concentrate sales [member] | Customer Concentration Risk [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Trade and other receivables | $ 35,100,000 |  |  |  | $ 48,800,000 |  |  |  |  |  |  |
Number of well-known concentrate buyers | buyer | 5 | 5 | 5 | 5 |  |  |  |  |  |  |  |
Trade receivables from dore sales [member] | Customer Concentration Risk [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Trade and other receivables | $ 0 |  |  |  | 17,500,000 |  |  |  |  |  |  |
Republic Metals [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Allowance account for credit losses of financial assets | $ 4,700,000 |  |  |  | $ 4,700,000 |  |  |  |  |  |  |
Top of range [member] | Currency risk [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Call rate | (per share) |  |  |  |  |  |  |  |  | $ 30.43 | S/ 3.67 |  |
Weighted average [member] | Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on borrowings (percent) | 1.30% |  |  |  |  |  |  |  | 1.30% | 1.30% |  |
Weighted average [member] | Credit Facility [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on borrowings (percent) | 2.60% |  |  |  | 4.30% |  |  |  | 2.60% | 2.60% |  |

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