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Financial Instruments - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) tonne $ / pure $ / tonne | Dec. 31, 2016 USD ($) $ / tonne
Disclosure of detailed information about financial instruments [line items] |  |
Impact of 10% increase in metal prices on revenues | $ 83,900,000 | $ 82,700,000
Impact of 10% decrease in metal prices on revenues | 85,300,000 | 85,000,000
Impact of 10% increase in metal prices on earnings before taxes | 7,400,000 | 4,700,000
Impact of 10% decrease in metal prices on earnings before taxes | 7,400,000 | 4,700,000
Trade and other receivables | 109,746,000 | 130,117,000
Minimum finance lease payments payable, at present value | 7,559,000 | 7,101,000
Borrowings | 0 | 36,200,000
Interest paid on finance lease obligations | 200,000 | 100,000
Current borrowings | $ 3,000,000 | $ 0
Interest rate on borrowings (percent) | 1.80% |
Interest earned on cash and short-term investments (percent) | 0.77% | 0.30%
Impact of 10% change in interest earned on earnings before taxes | $ 200,000 | $ 100,000
Gains (losses) on commodity, diesel fuel swaps, and foreign currency contracts (Note 7) | 606,000 | (4,944,000)
Realized losses on foreign currency, diesel fuel swap and commodity contracts | 910,000 | 21,000
Realized losses on foreign currency, diesel fuel swap and commodity contracts | (304,000) | (4,965,000)
Allowance account for credit losses of financial assets | 7,600,000 | 7,600,000
Production Concentration Risk [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Inventories (Note 9) | 21,900,000 | 28,500,000
Credit risk [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Current advances to suppliers | $ 14,300,000 | 28,800,000
Interest rate risk [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Annualized interest rate on lease obligations (percent) | 2.20% |
Interest rate on borrowings (percent) | 1.80% |
Currency risk [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Gains (losses) on commodity, diesel fuel swaps, and foreign currency contracts (Note 7) | $ 3,800,000 | (1,500,000)
Effect of 10% change in exchange rate on income before taxes | 17,400,000 | 19,200,000
Trade receivables from provisional concentrate sales [member] | Customer Concentration Risk [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Trade and other receivables | $ 52,000,000 | 45,000,000
Number of well-known concentrate buyers | 0 |
Credit Facility [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Borrowings | $ 0 | 36,200,000
Interest expense on borrowings | $ 900,000 | $ 1,000,000
LIBOR [member] | Bottom of range [member] | Credit Facility [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Borrowings, adjustment to interest rate basis | 2.125% |
LIBOR [member] | Bottom of range [member] | Credit Facility [member] | Interest rate risk [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Borrowings, adjustment to interest rate basis | 2.125% |
LIBOR [member] | Top of range [member] | Credit Facility [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Borrowings, adjustment to interest rate basis | 3.125% |
LIBOR [member] | Top of range [member] | Credit Facility [member] | Interest rate risk [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Borrowings, adjustment to interest rate basis | 3.125% |
Copper [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Commodity price, per tonne | $ / tonne | 5,500 | 5,000
Copper [member] | Collar [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Gain (loss) on designation of financial instrument as measured at fair value through profit or loss because credit derivative is used to manage credit risk | $ 900,000 |
Derivative contract, remaining commodity amounts outstanding (tonnes) | tonne | 3,030 |
Copper [member] | Bottom of range [member] | Collar [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Commodity price, per tonne | 6,222 |
Copper [member] | Top of range [member] | Collar [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Commodity price, per tonne | 7,277 |
Zinc [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Commodity price, per tonne | $ / tonne | 2,600 | 2,200
Zinc [member] | Collar [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Gain (loss) on designation of financial instrument as measured at fair value through profit or loss because credit derivative is used to manage credit risk | $ (1,900,000) | $ (4,300,000)
Derivative contract, remaining commodity amounts outstanding (tonnes) | tonne | 11,100 |
Zinc [member] | Bottom of range [member] | Collar [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Commodity price, per tonne | 2,609 |
Zinc [member] | Top of range [member] | Collar [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Commodity price, per tonne | 3,555 |
Lead [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Commodity price, per tonne | $ / tonne | 2,200 | 2,000
Lead [member] | Collar [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Gain (loss) on designation of financial instrument as measured at fair value through profit or loss because credit derivative is used to manage credit risk | $ (400,000) | $ (200,000)
Derivative contract, remaining commodity amounts outstanding (tonnes) | tonne | 6,450 |
Lead [member] | Bottom of range [member] | Collar [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Commodity price, per tonne | 2,200 |
Lead [member] | Top of range [member] | Collar [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Commodity price, per tonne | 2,679 |
Doe Run Peru [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Allowance account for credit losses of financial assets | $ 7,600,000 |
Commodity Swaps, Diesel Fuel Swaps and Foreign Currency Contracts [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Realized losses on foreign currency, diesel fuel swap and commodity contracts | $ (1,900,000) | (2,800,000)
Diesel Fuel Swap [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Realized losses on foreign currency, diesel fuel swap and commodity contracts |  | $ 1,000,000

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