XML 87 R37.htm IDEA: XBRL DOCUMENT
v3.25.2

COMMON SHARES (Tables) | 12 Months Ended
--- | ---
Jun. 30, 2025
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Schedule of changes in the fair value of Private Warrants liabilities |
Schedule of changes in the fair value of Private Warrants liabilities |  | November 2024 Private Warrants |
Fair value at issuance (November 13, 2024) |  | $ | 1,929 |
Fair value of Warrants exercised |  |  | (338 | )
Change in fair value |  |  | 2,240 |
Fair value as of June 30, 2025 |  | $ | 3,831 |
Schedule of Black-Scholes model for warrants |
Schedule of Black-Scholes model for warrants |  | Series A Public Warrants |  |  | Series B Public Warrants |
Closing Common Share price |  | $ | 2.25 |  |  | $ | 2.25 |
Term (years) |  |  | 2.5 |  |  |  | 4.0 |
Historic equity volatility |  |  | 73.18 | % |  |  | 73.36 | %
Risk-free rate |  |  | 4.23 | % |  |  | 4.31 | %
Schedule of issued Common Shares under the Yorkville Equity Facility Financing Agreement |
Schedule of issued Common Shares under the Yorkville Equity Facility Financing Agreement |  | For The Year Ended June 30, |
|  | 2025 |  |  | 2024 |
Common Shares issued |  |  | 5,671,742 |  |  |  | 1,358,000 |
Gross funds received |  | $ | 12,352 |  |  | $ | 3,293 |
Market value of Common Shares issued |  |  | 12,941 |  |  |  | 3,398 |
Loss on issuance(1) |  | $ | 589 |  |  | $ | 105 |
| (1) | Loss on issuance represents a non-cash amount equal to the difference between the proceeds received and the fair value of the Common Shares issued based on the Nasdaq closing price per Common Share on the issuance date and is recorded in other operating expenses in the condensed consolidated statement of operations and comprehensive loss.
Schedule of option |
Schedule of option |  |  | Number of Options |  |  | Weighted Average Exercise Price |  |  | Aggregate Intrinsic Value |  |  | Weighted Average Remaining Contractual Life |
Balance, June 30, 2023 |  |  |  | 1,541,500 |  |  | $ | 7.19 |  |  |  |  |  |  |  |  |
Granted |  |  |  | 1,625,000 |  |  |  | 2.99 |  |  |  |  |  |  |  |  |
Exercised |  |  |  | (7,800 | ) |  |  | 3.95 |  |  |  |  |  |  |  |  |
Cancelled/expired |  |  |  | (663,200 | ) |  |  | 5.88 |  |  |  |  |  |  |  |  |
Balance, June 30, 2024 |  |  |  | 2,495,500 |  |  |  | 4.78 |  |  |  |  |  |  |  |  |
Granted |  |  |  | 945,000 |  |  |  | 1.41 |  |  |  |  |  |  |  |  |
Exercised |  |  |  | (512 | ) |  |  | 1.40 |  |  |  |  |  |  |  |  |
Cancelled/expired |  |  |  | (419,988 | ) |  |  | 9.44 |  |  |  |  |  |  |  |  |
Balance, June 30, 2025 |  |  |  | 3,020,000 |  |  | $ | 3.09 |  |  | $ | 866 |  |  |  | 3.5 years |
Schedule of weighted average and assumptions used to option costs |
Schedule of weighted average and assumptions used to option costs |  | For the year ended June 30, |
|  | 2025 |  |  | 2024 |
Fair value per option granted during the period |  | $ | 0.84 |  |  | $ | 1.71 |
Risk-free interest rate |  |  | 4.44 | % |  |  | 4.25 | %
Expected dividend yield |  |  | 0 | % |  |  | 0 | %
Expected stock price volatility (historical basis) |  |  | 67.3 | % |  |  | 63.2 | %
Expected option life in years |  |  | 5.0 |  |  |  | 5.0 |
Schedule of Weighted average exercise prices |
Schedule of Weighted average exercise prices |  | Warrants |  |  | Weighted Average Exercise Price |
Balance, June 30, 2023 |  |  | 18,816,304 |  |  | $ | 10.98 |
Granted |  |  | 1,593,817 |  |  |  | 3.33 |
Expired |  |  | (1,846,560 | ) |  |  | 8.67 |
Balance, June 30, 2024 |  |  | 18,563,561 |  |  |  | 10.53 |
Granted |  |  | 13,553,714 |  |  |  | 2.05 |
Exercised |  |  | (828,235 | ) |  |  | 1.78 |
Expired |  |  | (1,303,118 | ) |  |  | 7.72 |
Balance, June 30, 2025 |  |  | 29,985,922 |  |  | $ | 7.06 |
Schedule of outstanding exercisable Warrants |
Schedule of outstanding exercisable Warrants |  |  |  |  |  |
Number |  |  | Exercise Price |  |  | Expiry Date
| 250,000 |  |  | $ | 4.60 |  |  | September 1, 2025
| 413,432 |  |  |  | 3.54 |  |  | December 22, 2025
| 315,000 |  |  |  | 2.20 |  |  | June 24, 2026
| 1,117,090 |  |  |  | 1.75 |  |  | November 5, 2026
| 1,992,214 |  |  |  | 1.75 |  |  | November 13, 2026
| 615,385 |  |  |  | 3.25 |  |  | April 12, 2027
| 2,577,320 |  |  |  | 1.98 |  |  | August 2, 2027
| 15,666,626 | (1) |  |  | 11.50 |  |  | March 17, 2028
| 2,816,742 |  |  |  | 2.31 |  |  | September 17, 2028
| 1,288,660 |  |  |  | 2.05 |  |  | January 31, 2029
| 802,045 |  |  |  | 2.07 |  |  | November 5, 2029
| 1,067,946 |  |  |  | 2.07 |  |  | November 13, 2029
| 1,063,462 |  |  |  | 2.60 |  |  | No expiry
| 29,985,922 |  |  |  |  |  |  |
(1) | Includes 11,165,324 and 4,501,302 2023 Public Warrants and 2023 Private Warrants, respectively, as defined below. Each 2023 Public Warrant and 2023 Private Warrant is exercisable into 1.11829212 Common Shares.
Schedule of Company classifies the 2023 Private Warrants |
Schedule of Company classifies the 2023 Private Warrants |  |  |  |  |  |  |  |
Key Valuation Input |  | June 30, 2025 |  |  | June 30, 2024 |
Stock price on valuation date |  | $ | 2.33 |  |  | $ | 1.73 |
Strike price |  | $ | 11.50 |  |  | $ | 11.50 |
Implied volatility of the 2023 Public Warrants |  |  | 90.0 | % |  |  | 69.0 | %
Risk free rate |  |  | 3.70 | % |  |  | 4.45 | %
Dividend yield |  |  | 0 | % |  |  | 0 | %
Expected Warrant life in years |  |  | 2.7 |  |  |  | 3.7 |
Schedule of change in the 2023 Private Warrants liability |
Schedule of change in the 2023 Private Warrants liability |  | Amount |
Valuation at June 30, 2023 |  | $ | 3,279 |
Change in valuation |  |  | (1,926 | )
Valuation at June 30, 2024 |  |  | 1,353 |
Exchange of 2023 Private Warrants for 2023 Public Warrants |  |  | (482 | )
Change in valuation |  |  | 1,661 |
Valuation at June 30, 2025 |  | $ | 2,532 |
Schedule of Black-Scholes valuation |
Schedule of Black-Scholes valuation |  |  |  |
Key Valuation Input |  | September 17, 2024 |
Closing Common Share price |  | $ | 1.74 |
Term (years) |  |  | 4.0 |
Historic equity volatility |  |  | 67.14 | %
Risk-free rate |  |  | 3.44 | %
Schedule of change in fair value of Warrants liability |
Schedule of change in fair value of Warrants liability |  | Amount |
Valuation at June 30, 2024 |  | $ | 2,365 |
Fair value of Warrants issued |  |  | (2,262 | )
Gain on issuance of Warrants |  |  | (103 | )
Ending balance |  | $ | - |
Public Warrants [Member] |
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Schedule of Black-Scholes model used in Private warrants |
Schedule of Black-Scholes model used in public warrants |  | November 5, 2024 |
November 2024 Public Warrants: |  | Series A Public Warrants |  |  | Series B Public Warrants |
Closing Common Share price |  | $ | 1.455 |  |  | $ | 1.455 |
Term (years) |  |  | 4.5 |  |  |  | 2.0 |
Historic equity volatility |  |  | 67.43 | % |  |  | 67.13 | %
Risk-free rate |  |  | 4.14 | % |  |  | 4.20 | %
Private Warrants [Member] |
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Schedule of Black-Scholes model used in Private warrants |
Schedule of Black-Scholes model used in Private warrants |  | November 13, 2024 |
November 2024 Private Warrants: |  | Series A Private Warrants |  |  | Series B Private Warrants |
Closing Common Share price |  | $ | 1.49 |  |  | $ | 1.49 |
Term (years) |  |  | 2.0 |  |  |  | 4.5 |
Historic equity volatility |  |  | 67.26 | % |  |  | 67.52 | %
Risk-free rate |  |  | 4.20 | % |  |  | 4.30 | %
|  | June 30, 2025 |
November 2024 Private Warrants: |  | Series A Private Warrants |  |  | Series B Private Warrants |
Closing Common Share price |  | $ | 2.33 |  |  | $ | 2.33 |
Term (years) |  |  | 1.37 |  |  |  | 4.38 |
Historic equity volatility |  |  | 86.14 | % |  |  | 74.26 | %
Risk-free rate |  |  | 3.88 | % |  |  | 3.77 | %

X
- Definition The element represents fair value assets and liability measured on recurring and nonrecurring basis of warrants table text block. + References No definition available. + Details
Name: | niobf_FairValueAssetsAndLiabilityMeasuredOnRecurringAndNonrecurringBasisOfWarrantsTableTextBlock
Namespace Prefix: | niobf_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition The element represents fair value assets and liability measured on recurring and nonrecurring basis table text block. + References No definition available. + Details
Name: | niobf_FairValueAssetsAndLiabilityMeasuredOnRecurringAndNonrecurringBasisTableTextBlock
Namespace Prefix: | niobf_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition The element represents schedule common shares under facility financing agreement table text block. + References No definition available. + Details
Name: | niobf_ScheduleCommonSharesUnderFacilityFinancingAgreementTableTextBlock
Namespace Prefix: | niobf_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition The element represents schedule of changes in the fair value of private warrants table text block. + References No definition available. + Details
Name: | niobf_ScheduleOfChangesInTheFairValueOfPrivateWarrantsTableTextBlock
Namespace Prefix: | niobf_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition The element represents schedule of changes in the fair value of the2023 private warrants liability table text block. + References No definition available. + Details
Name: | niobf_ScheduleOfChangesInTheFairValueOfThe2023PrivateWarrantsLiabilityTableTextBlock
Namespace Prefix: | niobf_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition The element represents schedule of changes in the fair value of the private warrants table text block. + References No definition available. + Details
Name: | niobf_ScheduleOfChangesInTheFairValueOfThePrivateWarrantsTableTextBlock
Namespace Prefix: | niobf_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition The element represents schedule of outstanding exercisable warrants table text block. + References No definition available. + Details
Name: | niobf_ScheduleOfOutstandingExercisableWarrantsTableTextBlock
Namespace Prefix: | niobf_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480870/815-30-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480870/815-30-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480870/815-30-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480870/815-30-50-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482765/220-10-50-4 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482765/220-10-50-5 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-1 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481694/830-30-45-17 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481694/830-30-45-20 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481694/830-30-45-20 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481694/830-30-45-20 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481694/830-30-45-20 + Details
Name: | us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of financial instrument measured at fair value on recurring or nonrecurring basis. Includes, but is not limited to, instrument classified in shareholders' equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 + Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the change in stock options. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfStockOptionsRollForwardTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481112/505-10-50-3 + Details
Name: | us-gaap_ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=niobf_PublicWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=niobf_PrivateWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |