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Acquisitions and Divestitures - Summary of Preliminary Allocation of Purchase Price (Parenthetical) (Detail) - Integra gold corporation [member]	12 Months Ended
	Dec. 31, 2017 $ / shares	Jul. 10, 2017
Disclosure of detailed information about business combination [line items]
Number of common shares issued	77,180,898	77,180,898
Share price	$ 3.14

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Business combination share price.

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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.

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- Definition

The number of instruments or interests issued or issuable at acquisition date for equity interests of the acquirer transferred as consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2017-01-01
-Paragraph B64
-Subparagraph f
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B64_f_iv&doctype=Appendix&seq=2
-URIDate 2017-03-09

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