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CRITICAL ACCOUNTING JUDGEMENTS, ESTIMATES AND ASSUMPTIONS (Details) - CAD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
CRITICAL ACCOUNTING JUDGMENTS, ESTIMATES AND ASSUMPTIONS
Exploration and evaluation assets	$ 50,494	$ 38,342

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- Definition

The amount of exploration and evaluation assets recognised as tangible assets in accordance with the entity's accounting policy. [Refer: Exploration and evaluation assets [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 6
-IssueDate 2017-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=6&date=2017-03-01&anchor=para_25&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_TangibleExplorationAndEvaluationAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	nanv_CriticalAccountingJudgementsEstimatesAndAssumptionsAbstract
Namespace Prefix:	nanv_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration