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Basis of Preparation and Significant Accounting Policies - Schedule of Depreciation and Amortization Rate (Details)	12 Months Ended
	Dec. 31, 2019
Exploration Equipment [Member]
Statement Line Items [Line Items]
Depreciation and amortization rate	20.00%
Computer Software [Member]
Statement Line Items [Line Items]
Depreciation and amortization rate	50.00%
Computer Equipment [Member]
Statement Line Items [Line Items]
Depreciation and amortization rate	55.00%

X

- Definition

Represents the depreciation and amortization rate.

+ References

No definition available.

+ Details

Name:	WSCRF_DepreciationAndAmortizationRate
Namespace Prefix:	WSCRF_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Ifrs Statement Line Items.

+ References

No definition available.

+ Details

Name:	WSCRF_IfrsStatementLineItems
Namespace Prefix:	WSCRF_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_TangibleExplorationAndEvaluationAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_ComputerSoftwareMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=WSCRF_ComputerEquipmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: