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CAPITAL AND FINANCIAL RISK MANAGEMENT - Gold and silver price risk management (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Gold and silver price risk |  |
Capital and financial risk management |  |
Derivatives to hedge metal sales | $ 0 | $ 0

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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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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of a hedged item, recognised as an asset. [Refer: Hedged items [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 24B -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_24B_a_i&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_HedgedItemAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | ifrs-full_TypesOfRisksAxis=ifrs-full_OtherPriceRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |