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Financial risk management (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Credit risk [Member] | Trade and other receivables [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instrument | $ 3.8 | $ 2.1
Credit risk [Member] | Mexican Value Added Taxes [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instrument | 2.8 | 1.6
Silver, Zinc, Lead and Copper Prices [Member] | Trade and other receivables [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Risk exposure associated with instrument | $ 0.4 | $ 0.2

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of risk exposure associated with financial instruments with a shared characteristic that identifies a concentration of risks. [Refer: Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph B8 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_B8_c&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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