Document and Entity Information - shares	3 Months Ended
	Oct. 31, 2018	Dec. 13, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	NORTHERN MINERALS & EXPLORATION LTD.
Entity Central Index Key	0001415744
Trading Symbol	NMEX
Amendment Flag	false
Current Fiscal Year End Date	--07-31
Document Type	10-Q
Document Period End Date	Oct. 31, 2018
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Ex Transition Period	false
Entity Common Stock, Shares Outstanding		48,436,818