Financial Instruments - Fair Value through Profit and Loss (Details) - USD ($)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]
Current derivative financial assets	$ 1,092,000	$ 0
Current derivative financial liabilities	1,906,000	2,815,000
Financial assets	102,728,000	78,874,000
Gains (losses) on commodity and diesel fuel swap and foreign currency contracts:
Realized losses on foreign currency, diesel fuel swap and commodity contracts	(304,000)	(4,965,000)
Realized losses on foreign currency, diesel fuel swap and commodity contracts	910,000	21,000
Gains (losses) on commodity and diesel fuel swap and foreign currency contracts	606,000	(4,944,000)
Gain on warrants	64,000	0
Financial liabilities at fair value through profit or loss, category [member]
Disclosure of detailed information about financial instruments [line items]
Current derivative financial liabilities	1,906,000	2,815,000
Zinc contracts [member]
Disclosure of detailed information about financial instruments [line items]
Current derivative financial liabilities	716,000	1,769,000
Zinc contracts [member] \| Financial liabilities at fair value through profit or loss, category [member]
Disclosure of detailed information about financial instruments [line items]
Current derivative financial liabilities	716,000	1,769,000
Lead contracts [member]
Disclosure of detailed information about financial instruments [line items]
Current derivative financial liabilities	243,000	54,000
Lead contracts [member] \| Financial liabilities at fair value through profit or loss, category [member]
Disclosure of detailed information about financial instruments [line items]
Current derivative financial liabilities	243,000	54,000
Copper contracts [member]
Disclosure of detailed information about financial instruments [line items]
Current derivative financial liabilities	891,000
Copper contracts [member] \| Financial liabilities at fair value through profit or loss, category [member]
Disclosure of detailed information about financial instruments [line items]
Current derivative financial liabilities	891,000	0
Currency swap contract [member]
Disclosure of detailed information about financial instruments [line items]
Current derivative financial liabilities	56,000	992,000
Currency swap contract [member] \| Financial liabilities at fair value through profit or loss, category [member]
Disclosure of detailed information about financial instruments [line items]
Current derivative financial liabilities	56,000	992,000
Financial assets at fair value through profit or loss, category [member]
Disclosure of detailed information about financial instruments [line items]
Current derivative financial assets	1,092,000	0
Financial assets at fair value through profit or loss, category [member] \| Trade and other receivables
Disclosure of detailed information about financial instruments [line items]
Financial assets	109,746,000	130,117,000
Warrants [member]
Gains (losses) on commodity and diesel fuel swap and foreign currency contracts:
Gain on warrants	64,000	0
Warrants [member] \| Financial assets at fair value through profit or loss, category [member]
Disclosure of detailed information about financial instruments [line items]
Current derivative financial assets	1,092,000	0
Trade receivables from provisional concentrate sales [member] \| Trade and other receivables
Disclosure of detailed information about financial instruments [line items]
Financial assets	51,952,000	44,960,000
Trade receivables from provisional concentrate sales [member] \| Financial assets at fair value through profit or loss, category [member] \| Trade and other receivables
Disclosure of detailed information about financial instruments [line items]
Financial assets	51,952,000	44,960,000
Advances to suppliers [member] \| Financial assets at fair value through profit or loss, category [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	14,327,000	28,762,000
Not arising from sale of metal concentrates [member] \| Financial assets at fair value through profit or loss, category [member] \| Trade and other receivables
Disclosure of detailed information about financial instruments [line items]
Financial assets	$ 43,467,000	$ 56,395,000

The amount of current derivative financial assets. [Refer: Derivative financial assets]

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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The gains (losses) on financial assets at fair value through profit or loss. [Refer: Financial assets at fair value through profit or loss]

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The gains resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]]

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