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Related Party Transactions - Schedule of Key Management Compensation (Details) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of transactions between related parties [abstract]
Geological consulting fees - expensed	$ 5	$ 136	$ 104
Geological consulting fees - capitalized			18
Management fees - expensed	478	747	747
Salaries - expensed	182	185	181
Share-based payments	756		192
Total	$ 1,421	$ 1,068	$ 1,242

X

- Definition

Geological consulting fees – capitalized.

+ References

No definition available.

+ Details

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Namespace Prefix:	WSCRF_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of compensation to key management personnel in the form of geological consulting fees, expensed by the company.

+ References

No definition available.

+ Details

Name:	WSCRF_KeyManagementPersonnelCompensationGeologicalConsultingFeesExpensed
Namespace Prefix:	WSCRF_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of compensation to key management personnel in the form of management fees.

+ References

No definition available.

+ Details

Name:	WSCRF_KeyManagementPersonnelCompensationManagementFeesExpensed
Namespace Prefix:	WSCRF_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of compensation to key management personnel in the form of salary.

+ References

No definition available.

+ Details

Name:	WSCRF_KeyManagementPersonnelCompensationShortTermEmployeeBenefitsWagesAndSalaries
Namespace Prefix:	WSCRF_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2020-01-01
-Paragraph 17
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2020-en-r&anchor=para_17&doctype=Standard
-URIDate 2020-01-01

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2020-01-01
-Paragraph 17
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2020-en-r&anchor=para_17_e&doctype=Standard
-URIDate 2020-01-01

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration