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Related Party Transactions - Schedule of Key Management Compensation (Details) - CAD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Disclosure of transactions between related parties [abstract] |  |
Geological consulting fees - expensed | $ 26 | $ 26
Geological consulting fees - capitalized |  | 18
Management fees - expensed | 188 | 178
Salaries - expensed | 47 | 29
Share-based payments |  | 170
Total | $ 261 | $ 421

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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: | NAN_
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: | NAN_
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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
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Namespace Prefix: | NAN_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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: | NAN_
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 2018-01-01 -Paragraph 17 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2018-03-01&anchor=para_17&doctype=Standard -URIDate 2018-03-16 + Details
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Balance Type: | debit
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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 2018-01-01 -Paragraph 17 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2018-03-01&anchor=para_17_e&doctype=Standard -URIDate 2018-03-16 + Details
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Balance Type: | debit
Period Type: | duration