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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

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

Name:	NAN_KeyManagementPersonnelCompensationGeologicalConsultingFeesCapitalized
Namespace Prefix:	NAN_
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:	NAN_KeyManagementPersonnelCompensationGeologicalConsultingFeesExpensed
Namespace Prefix:	NAN_
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:	NAN_KeyManagementPersonnelCompensationManagementFeesExpensed
Namespace Prefix:	NAN_
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:	NAN_KeyManagementPersonnelCompensationShortTermEmployeeBenefitsWagesAndSalaries
Namespace Prefix:	NAN_
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 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

Name:	ifrs-full_KeyManagementPersonnelCompensation
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 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

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