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Related Party Transactions and Private Company Investment - Schedule of Key Management Compensation (Details) - CAD ($) $ in Thousands | 12 Months Ended
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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

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- 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

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- 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_
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Period Type: | duration

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- 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

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- Definition The amount of compensation to key management personnel in the form of salary. + References No definition available. + Details
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Namespace Prefix: | WSCRF_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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- 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
Name: | ifrs-full_KeyManagementPersonnelCompensation
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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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Balance Type: | debit
Period Type: | duration