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Related Party Transactions and Private Company Investment - Schedule of Key Management Compensation (Details) - CAD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of transactions between related parties [abstract]
Geological consulting fees - expensed	$ 136	$ 104	$ 35
Geological consulting fees - capitalized		18	178
Management fees - expensed	747	747	749
Salaries - expensed	185	181	128
Share-based payments		192	358
Total	$ 1,068	$ 1,242	$ 1,448

X

- Definition

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

+ 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

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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 management fees.

+ 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 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 2019-01-01
-Paragraph 17
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2019-en-r&anchor=para_17&doctype=Standard
-URIDate 2019-03-27

+ 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 2019-01-01
-Paragraph 17
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2019-en-r&anchor=para_17_e&doctype=Standard
-URIDate 2019-03-27

+ Details

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