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Financial risk management (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
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

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