XML 77 R19.htm IDEA: XBRL DOCUMENT v3.24.3

EXPLORATION EXPENDITURES

12 Months Ended

Jun. 30, 2024

Exploration Expenditures

EXPLORATION EXPENDITURES

13. EXPLORATION EXPENDITURES

 Schedule of exploration expenditures

		For the year ended June 30,
		2024				2023
Feasibility study and engineering		$	353			$	410
Field management and other			503				738
Metallurgical			1,678				4,174
Geologists and field staff			18				26
Total		$	2,552			$	5,348

X

- References

No definition available.

+ Details

Name:	niobf_DisclosureExplorationExpendituresAbstract
Namespace Prefix:	niobf_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The element represents exploration expenditures disclosures text block.

+ References

No definition available.

+ Details

Name:	niobf_ExplorationExpendituresDisclosuresTextBlock
Namespace Prefix:	niobf_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration