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GOLD STREAM OBLIGATION - Additional Information (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) oz
GOLD STREAM OBLIGATION |
Transaction price allocated to remaining performance obligations | $ | $ 175
Gold stream obligation, rate of gold production to be delivered for initial threshold | 6.50%
Gold stream obligation initial threshold quantity | 230,000
Gold stream obligation rate of gold production to be delivered after initial threshold | 3.25%
Gold stream obligation, rate of silver production to be delivered for initial threshold | 60.00%
Gold stream obligation, silver production, initial threshold quantity | 3,100,000
Gold stream obligation, rate of silver production to be delivered after initial threshold | 30.00%
Average spot rate of gold or silver | 25.00%
Term of the agreement | 40 years

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- Definition The amount of the transaction price allocated to the performance obligations that are unsatisfied (or partially unsatisfied) as of the end of the reporting period. The transaction price is the amount of consideration to which an entity expects to be entitled in exchange for transferring promised goods or services to a customer, excluding amounts collected on behalf of third parties (for example, some sales taxes). [Refer: Performance obligations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2019-01-01 -Paragraph 120 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&anchor=para_120_a&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition It represents the price, Royal Gold will pay New Gold for the ounces delivered. + References No definition available. + Details
Name: | ngd_AverageSpotRateOfGoldOrSilver
Namespace Prefix: | ngd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | ngd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the first threshold quantity of gold production after entering into the transaction. + References No definition available. + Details
Name: | ngd_GoldStreamObligationInitialThresholdQuantity
Namespace Prefix: | ngd_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The percentage rate of gold production which will be delivered for the initial threshold after initial threshold. + References No definition available. + Details
Name: | ngd_GoldStreamObligationRateOfGoldProductionToBeDeliveredAfterInitialThreshold
Namespace Prefix: | ngd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The percentage rate of gold production which will be delivered for the initial threshold after entering into the transaction. + References No definition available. + Details
Name: | ngd_GoldStreamObligationRateOfGoldProductionToBeDeliveredForInitialThreshold
Namespace Prefix: | ngd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The percentage rate of silver production which will be delivered for the initial threshold after initial threshold. + References No definition available. + Details
Name: | ngd_GoldStreamObligationRateOfSilverProductionToBeDeliveredAfterInitialThreshold
Namespace Prefix: | ngd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage rate of Silver production which will be delivered for the initial threshold after entering into the transaction. + References No definition available. + Details
Name: | ngd_GoldStreamObligationRateOfSilverProductionToBeDeliveredForInitialThreshold
Namespace Prefix: | ngd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents the first threshold quantity of silver production after entering into the transaction. + References No definition available. + Details
Name: | ngd_GoldStreamObligationSilverProductionInitialThresholdQuantity
Namespace Prefix: | ngd_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The term of the agreement which is entered with the wholly-owned subsidiary. + References No definition available. + Details
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Namespace Prefix: | ngd_
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Balance Type: | na
Period Type: | duration