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Accrued Liabilities (Details Narrative) - USD ($)	Apr. 30, 2021	Jul. 31, 2020
Payables and Accruals [Abstract]
Unused funds	$ 23,175	$ 23,175

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+ Details

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Namespace Prefix:	NMEX_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration