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SUBSEQUENT EVENTS (Details Narrative) - Subsequent Event [Member] - USD ($)	Dec. 01, 2024	Sep. 17, 2024	Sep. 11, 2024	Sep. 04, 2024	Sep. 01, 2024
Subsequent Event [Line Items]
Subsequent event description				On September 4, 2024, NioCorp entered into (i) a consent and waiver (the “Yorkville Consent”) to the April 2024 Note issued and sold to Yorkville pursuant to the April 2024 Purchase Agreement and (ii) a consent and waiver (together with the Yorkville Consent, the “Consents”) to the April 2024 Note issued and sold to Lind Global Fund II LP pursuant to the April 2024 Purchase Agreement. The Consents, among other things, reduced the amounts due to the April 2024 Purchasers on September 1, 2024 by an aggregate of $1,176 to an aggregate of $336, increased the amounts due to the April 2024 Purchasers on December 1, 2024 by an aggregate of $1,176, and prospectively waived any term of the April 2024 Notes that would otherwise be triggered upon a failure of the Company to pay to the April 2024 Purchasers the remainder of the amount due on September 1, 2024. Except as modified by the Consents, the terms of the April 2024 Notes as previously disclosed are unchanged.
Aggregate principal amount	$ 1,176,000,000				$ 1,176,000,000
Increased the amounts due					$ 336,000,000
Lind Consent Warrant Issuance [Member]
Subsequent Event [Line Items]
Number of share issued		2,816,742
Exercise price		$ 2.308
Warrants issued		$ 5,000
Mark Smith [Member]
Subsequent Event [Line Items]
Line of credit facility			$ 2,000
Interest rate			10.00%
Establishment fee			2.50%

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