Document and Entity Information - USD ($)	12 Months Ended
	Jul. 31, 2021	Oct. 25, 2021	Jan. 31, 2021
Cover [Abstract]
Entity Registrant Name	NORTHERN MINERALS & EXPLORATION LTD.
Entity Central Index Key	0001415744
Amendment Flag	true
Amendment Description	This Amendment No. 1 to the Form 10-K/A (this “Amendment”) amends the Registrant’s Annual Report on Form 10-K for the fiscal year ended July 31, 2021, which the Registrant previously filed with the Securities and Exchange Commission on October 29, 2021. The Registrant is filing this Amendment to include the Report of Independent Registered Public Accounting Firm. Due to a filing error the report was unintentionally omitted. Except as set forth above, the original filing has not been amended, updated or otherwise modified.
Current Fiscal Year End Date	--07-31
Document Type	10-K/A
Document Period End Date	Jul. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Current Reporting Status	No
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Interactive Data Current	Yes
Entity Incorporation, State or Country Code	NV
Entity File Number	333-146934
Entity Public Float			$ 1,585,261
Entity Common Stock, Shares Outstanding		81,052,338