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Financial Instruments - Additional Information (Details) S/ / shares in Units, $ / shares in Units, $ / shares in Units, $ in Millions | 12 Months Ended |
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Dec. 31, 2019 USD ($) buyer | Dec. 31, 2019 PEN (S/) buyer | Dec. 31, 2019 MXN ($) buyer | Dec. 31, 2019 CAD ($) buyer | Dec. 31, 2018 USD ($) | Dec. 31, 2018 PEN (S/) | Dec. 31, 2018 MXN ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2019 PEN (S/) S/ / shares | Dec. 31, 2019 MXN ($) $ / shares | Dec. 31, 2019 CAD ($) $ / shares
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Trade and other receivables | $ 168,753,000 |  |  |  | $ 96,091,000 |  |  |  |  |  |
Value contained in precious metal inventory at refineries | 370,716,000 |  |  |  | 214,465,000 |  |  |  |  |  |
Gains (losses) on MXN derivative contracts | 3,315,000 |  |  |  | 4,930,000 |  |  |  |  |  |
Minimum finance lease payments payable, at present value | $ 41,208,000 |  |  |  | $ 6,676,000 |  |  |  |  |  |
Interest earned on cash and short-term investments (percent) | 0.60% | 0.60% | 0.60% | 0.60% | 0.90% | 0.90% | 0.90% | 0.90% |  |  |
Impact of 10% change in interest earned on earnings before taxes | $ 100,000 |  |  |  | $ 200,000 |  |  |  |  |  |
Debt (Note 19) | 275,000,000 |  |  |  | 0 |  |  |  |  |  |
Impact of 10% increase in metal prices on revenues | 139,100,000 |  |  |  | 81,200,000 |  |  |  |  |  |
Impact of 10% decrease in metal prices on revenues | 140,100,000 |  |  |  | 82,700,000 |  |  |  |  |  |
Impact of 10% increase in metal prices on earnings before taxes | 6,400,000 |  |  |  | 6,200,000 |  |  |  |  |  |
Impact of 10% decrease in metal prices on earnings before taxes | 6,400,000 |  |  |  | 6,200,000 |  |  |  |  |  |
Production Concentration Risk [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Value contained in precious metal inventory at refineries | 58,200,000 |  |  |  | 19,700,000 |  |  |  |  |  |
Credit risk [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Current advances to suppliers | 3,391,000 |  |  |  | 14,370,000 |  |  |  |  |  |
Currency risk [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Outstanding positions in foreign currency exposure |  |  |  |  |  |  |  |  | S/ 60,000,000 | $ 12.0 | $ 30,000,000
Put rate | (per share) |  |  |  |  |  |  |  |  | S/ 3.35 | $ 19.50 | $ 1.30
Call rate | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 1.37
Gains (losses) on MXN derivative contracts |  | S/ 700,000 | $ 1.0 | $ 300,000 |  | S/ 0 | $ (0.7) | $ 0 |  |  |
Effect of 10% change in exchange rate on income before taxes | $ 5,100,000 |  |  |  | $ 14,300,000 |  |  |  |  |  |
Interest rate risk [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Weighted averate rate on lease liabilities | 9.70% |  |  |  | 2.20% |  |  |  | 9.70% | 9.70% | 9.70%
Trade receivables from provisional concentrate sales [member] | Customer Concentration Risk [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Trade and other receivables | $ 48,800,000 |  |  |  | $ 40,800,000 |  |  |  |  |  |
Number of well-known concentrate buyers | buyer | 6 | 6 | 6 | 6 |  |  |  |  |  |  |
Trade receivables from dore sales [member] | Customer Concentration Risk [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Trade and other receivables | $ 17,500,000 |  |  |  | 0 |  |  |  |  |  |
Doe Run Peru [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Allowance account for credit losses of financial assets | 7,600,000 |  |  |  | 7,600,000 |  |  |  |  |  |
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 |  |  |  |  |  |
Bottom of range [member] | Currency risk [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Call rate | (per share) |  |  |  |  |  |  |  |  | S/ 3.40 | $ 20.82 |
Top of range [member] | Currency risk [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |  |  |  |  |  |
Call rate | (per share) |  |  |  |  |  |  |  |  | S/ 3.55 | $ 21.59 |

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