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Accrued Liabilites (Details Narrative) - USD ($)	Jul. 31, 2019	Jul. 31, 2018
Payables and Accruals [Abstract]
Unused funds received	$ 65,879	$ 170,518

X

- Definition

The amount of unused funds received.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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