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

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]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2020-01-01
-Paragraph 120
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_120_a&doctype=Standard
-URIDate 2020-01-01

Name:	ifrs-full_TransactionPriceAllocatedToRemainingPerformanceObligations
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

It represents the price, Royal Gold will pay New Gold for the ounces delivered.

No definition available.

Name:	ngd_AverageSpotRateOfGoldOrSilver
Namespace Prefix:	ngd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Conversion to Ownership Interest in Joint Venture

No definition available.

Name:	ngd_ConversionToOwnershipInterestInJointVenture
Namespace Prefix:	ngd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Financial Liability, Interest Acquired

No definition available.

Name:	ngd_FinancialLiabilityInterestAcquired
Namespace Prefix:	ngd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Financial Liability, Interest Conversion Term

No definition available.

Name:	ngd_FinancialLiabilityInterestConversionTerm
Namespace Prefix:	ngd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Financial Liability, Transaction Costs

No definition available.

Name:	ngd_FinancialLiabilityTransactionCosts
Namespace Prefix:	ngd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the first threshold quantity of gold production after entering into the transaction.

No definition available.

Name:	ngd_GoldStreamObligationInitialThresholdQuantity
Namespace Prefix:	ngd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The percentage rate of gold production which will be delivered for the initial threshold after initial threshold.

No definition available.

Name:	ngd_GoldStreamObligationRateOfGoldProductionToBeDeliveredAfterInitialThreshold
Namespace Prefix:	ngd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The percentage rate of gold production which will be delivered for the initial threshold after entering into the transaction.

No definition available.

Name:	ngd_GoldStreamObligationRateOfGoldProductionToBeDeliveredForInitialThreshold
Namespace Prefix:	ngd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The percentage rate of silver production which will be delivered for the initial threshold after initial threshold.

No definition available.

Name:	ngd_GoldStreamObligationRateOfSilverProductionToBeDeliveredAfterInitialThreshold
Namespace Prefix:	ngd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The percentage rate of Silver production which will be delivered for the initial threshold after entering into the transaction.

No definition available.

Name:	ngd_GoldStreamObligationRateOfSilverProductionToBeDeliveredForInitialThreshold
Namespace Prefix:	ngd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the first threshold quantity of silver production after entering into the transaction.

No definition available.

Name:	ngd_GoldStreamObligationSilverProductionInitialThresholdQuantity
Namespace Prefix:	ngd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Increase (Decrease) from Proceeds Received on Financial Liabilities

No definition available.

Name:	ngd_IncreaseDecreaseFromProceedsReceivedOnFinancialLiabilities
Namespace Prefix:	ngd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The term of the agreement which is entered with the wholly-owned subsidiary.

No definition available.