CAPITAL AND FINANCIAL RISK MANAGEMENT - Gold and silver price risk management (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Gold and silver price risk
Capital and financial risk management
Derivatives to hedge metal sales	$ 0	$ 0

The amount of a hedged item, recognised as an asset. [Refer: Hedged items [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 24B
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24B_a_i&doctype=Standard
-URIDate 2017-03-09

Name:	ifrs-full_HedgedItemAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant