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Unvested Elk Class B Shares will vest if, from the closing of the Business Combination until the tenth anniversary thereof, the volume-weighted average price (\"VWAP\") of the Issuer's common shares exceeds certain thresholds as follows: (a) one-half will vest if the VWAP of the Issuer's common shares exceeds $12.50 for any 20 trading days within any 30 trading day period, and (b) the remaining half will vest if the VWAP of the Issuer's common shares exceeds $15.00 for any 20 trading days within any 30 trading day period."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Reflects exchange of Class B common stock of Elk Creek Resources Corp (\"Elk Class B Shares\") exchanged for the Issuer's common shares on a one-for-one basis. Unvested Elk Class B Shares will vest if, from the closing of the Business Combination until the tenth anniversary thereof, the volume-weighted average price (\"VWAP\") of the Issuer's common shares exceeds certain thresholds as follows: (a) one-half will vest if the VWAP of the Issuer's common shares exceeds $12.50 for any 20 trading days within any 30 trading day period, and (b) the remaining half will vest if the VWAP of the Issuer's common shares exceeds $15.00 for any 20 trading days within any 30 trading day period."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Reflects exchange of Class B common stock of Elk Creek Resources Corp (\"Elk Class B Shares\") exchanged for the Issuer's common shares on a one-for-one basis. Unvested Elk Class B Shares will vest if, from the closing of the Business Combination until the tenth anniversary thereof, the volume-weighted average price (\"VWAP\") of the Issuer's common shares exceeds certain thresholds as follows: (a) one-half will vest if the VWAP of the Issuer's common shares exceeds $12.50 for any 20 trading days within any 30 trading day period, and (b) the remaining half will vest if the VWAP of the Issuer's common shares exceeds $15.00 for any 20 trading days within any 30 trading day period."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Reflects exchange of Class B common stock of Elk Creek Resources Corp (\"Elk Class B Shares\") exchanged for the Issuer's common shares on a one-for-one basis. Unvested Elk Class B Shares will vest if, from the closing of the Business Combination until the tenth anniversary thereof, the volume-weighted average price (\"VWAP\") of the Issuer's common shares exceeds certain thresholds as follows: (a) one-half will vest if the VWAP of the Issuer's common shares exceeds $12.50 for any 20 trading days within any 30 trading day period, and (b) the remaining half will vest if the VWAP of the Issuer's common shares exceeds $15.00 for any 20 trading days within any 30 trading day period."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 239,996 unvested Elk Class B Shares."}],"balance_after":239996,"derivative":{"underlying":"Common Shares","underlying_shares":323085},"source":{"system":"sec-edgar","filing":"0001539497-24-002706","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1512228/000153949724002706/ownership.xml","form_type":"4"}},{"id":1322638,"issuer":{"id":5368,"kind":"organization","name":"NIOCORP DEVELOPMENTS LTD"},"owners":[{"id":76274,"kind":"person","name":"Maselli Michael G.","position":1,"cik":"0001614590","reported_name":"Maselli Michael G.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Shares","published_at":"2024-12-23T21:00:17.000Z","date":"2024-12-20","kind":"other","planned":false,"acquired":true,"shares":323085,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Reflects exchange of Class B common stock of Elk Creek Resources Corp (\"Elk Class B Shares\") exchanged for the Issuer's common shares on a one-for-one basis. 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The reporting person is a managing member of Sponsor with shared voting and investment discretion with respect to securities held of record by Sponsor, and therefore, previously indirectly beneficially owned these securities through Sponsor."},{"field":"shares","element":"transactionShares","label":"F7","text":"Each warrant is exercisable for 1.118292212 common shares of the Issuer, such that an aggregate of 1,657,057 warrants are exercisable for an aggregate of 1,853,073 common shares, with an aggregate exercise price of $19,056,155.50 (or approximately $10.284 per share)."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"On March 17, 2023, the Issuer consummated the business combination (\"Business Combination\") contemplated by the Business Combination Agreement, dated as of September 25, 2022, as amended (the \"Business Combination Agreement\"), entered into by and among GX Acquisiton Corp. II, the Issuer, and Big Red Merger Sub Ltd, a wholly owned subsidiary of the Issuer. After the closing of the Business Combination, GX Acquisiton Corp. II changed its name to \"Elk Creek Resources Corp.\" GX Sponsor II LLC (\"Sponsor\") acquired Issuer securities and derivatives thereof in the Business Combination on behalf of its members, which were then immediately distributed to Sponsor's members, including the reporting person, on a pro rata basis for no consideration. The reporting person is a managing member of Sponsor with shared voting and investment discretion with respect to securities held of record by Sponsor, and therefore, previously indirectly beneficially owned these securities through Sponsor."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"The warrants may be exercised commencing 30 days after the consummation of the Business Combination and expire five years after the consummation of the Business Combination or earlier upon redemption."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F6","text":"The warrants may be exercised commencing 30 days after the consummation of the Business Combination and expire five years after the consummation of the Business Combination or earlier upon redemption."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F7","text":"Each warrant is exercisable for 1.118292212 common shares of the Issuer, such that an aggregate of 1,657,057 warrants are exercisable for an aggregate of 1,853,073 common shares, with an aggregate exercise price of $19,056,155.50 (or approximately $10.284 per share)."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F7","text":"Each warrant is exercisable for 1.118292212 common shares of the Issuer, such that an aggregate of 1,657,057 warrants are exercisable for an aggregate of 1,853,073 common shares, with an aggregate exercise price of $19,056,155.50 (or approximately $10.284 per share)."}],"balance_after":1657057,"derivative":{"exercise_price":10.284,"underlying":"Common Shares","underlying_shares":1853073},"source":{"system":"sec-edgar","filing":"0001539497-23-000474","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1322745/000153949723000474/ownership.xml","form_type":"4"}},{"id":1942764,"issuer":{"id":5368,"kind":"organization","name":"NIOCORP DEVELOPMENTS LTD"},"owners":[{"id":45946,"kind":"person","name":"Kehler Dean C","position":1,"cik":"0001322745","reported_name":"Kehler Dean C","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class B Common Stock of Elk Creek Resources Corp.","published_at":"2023-03-21T22:49:02.000Z","date":"2023-03-17","kind":"grant","planned":false,"acquired":true,"shares":555038,"ownership":{"direct":false,"nature":"By trust"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"These shares of Class B common stock of Elk Creek Resources Corp. (f/k/a GX Acquisiton Corp. II) (\"Elk Class B Shares\"), an indirect subsidiary of the Issuer, are exchangeable for the Issuer's common shares on a one-for-one basis. These shares have no expiration date."},{"field":"kind","element":"transactionCoding","label":"F2","text":"On March 17, 2023, the Issuer consummated the business combination (\"Business Combination\") contemplated by the Business Combination Agreement, dated as of September 25, 2022, as amended (the \"Business Combination Agreement\"), entered into by and among GX Acquisiton Corp. II, the Issuer, and Big Red Merger Sub Ltd, a wholly owned subsidiary of the Issuer. After the closing of the Business Combination, GX Acquisiton Corp. II changed its name to \"Elk Creek Resources Corp.\" GX Sponsor II LLC (\"Sponsor\") acquired Issuer securities and derivatives thereof in the Business Combination on behalf of its members, which were then immediately distributed to Sponsor's members, including the reporting person, on a pro rata basis for no consideration. The reporting person is a managing member of Sponsor with shared voting and investment discretion with respect to securities held of record by Sponsor, and therefore, previously indirectly beneficially owned these securities through Sponsor."},{"field":"shares","element":"transactionShares","label":"F5","text":"Includes 236,568 unvested Elk Class B Shares."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"On March 17, 2023, the Issuer consummated the business combination (\"Business Combination\") contemplated by the Business Combination Agreement, dated as of September 25, 2022, as amended (the \"Business Combination Agreement\"), entered into by and among GX Acquisiton Corp. II, the Issuer, and Big Red Merger Sub Ltd, a wholly owned subsidiary of the Issuer. After the closing of the Business Combination, GX Acquisiton Corp. II changed its name to \"Elk Creek Resources Corp.\" GX Sponsor II LLC (\"Sponsor\") acquired Issuer securities and derivatives thereof in the Business Combination on behalf of its members, which were then immediately distributed to Sponsor's members, including the reporting person, on a pro rata basis for no consideration. The reporting person is a managing member of Sponsor with shared voting and investment discretion with respect to securities held of record by Sponsor, and therefore, previously indirectly beneficially owned these securities through Sponsor."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"Unvested Elk Class B Shars will vest if, from the closing of the Business Combination until the tenth anniversary thereof, the volume-weighted average price (\"VWAP\") of the Issuer's common shares exceeds certain thresholds as follows: (a) one-half will vest if the VWAP of the Issuer's common shares exceeds $12.50 for any 20 trading days within any 30 trading day period, and (b) the remaining half will vest if the VWAP of the Issuer's common shares exceeds $15.00 for any 20 trading days within any 30 trading day period."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"Unvested Elk Class B Shars will vest if, from the closing of the Business Combination until the tenth anniversary thereof, the volume-weighted average price (\"VWAP\") of the Issuer's common shares exceeds certain thresholds as follows: (a) one-half will vest if the VWAP of the Issuer's common shares exceeds $12.50 for any 20 trading days within any 30 trading day period, and (b) the remaining half will vest if the VWAP of the Issuer's common shares exceeds $15.00 for any 20 trading days within any 30 trading day period."}],"balance_after":555038,"derivative":{"underlying":"Common Shares","underlying_shares":555038},"source":{"system":"sec-edgar","filing":"0001539497-23-000474","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1322745/000153949723000474/ownership.xml","form_type":"4"}},{"id":1942763,"issuer":{"id":5368,"kind":"organization","name":"NIOCORP DEVELOPMENTS LTD"},"owners":[{"id":45946,"kind":"person","name":"Kehler Dean C","position":1,"cik":"0001322745","reported_name":"Kehler Dean C","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class B Common Stock of Elk Creek Resources Corp.","published_at":"2023-03-21T22:49:02.000Z","date":"2023-03-17","kind":"grant","planned":false,"acquired":true,"shares":1956880,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"These shares of Class B common stock of Elk Creek Resources Corp. (f/k/a GX Acquisiton Corp. II) (\"Elk Class B Shares\"), an indirect subsidiary of the Issuer, are exchangeable for the Issuer's common shares on a one-for-one basis. These shares have no expiration date."},{"field":"kind","element":"transactionCoding","label":"F2","text":"On March 17, 2023, the Issuer consummated the business combination (\"Business Combination\") contemplated by the Business Combination Agreement, dated as of September 25, 2022, as amended (the \"Business Combination Agreement\"), entered into by and among GX Acquisiton Corp. II, the Issuer, and Big Red Merger Sub Ltd, a wholly owned subsidiary of the Issuer. After the closing of the Business Combination, GX Acquisiton Corp. II changed its name to \"Elk Creek Resources Corp.\" GX Sponsor II LLC (\"Sponsor\") acquired Issuer securities and derivatives thereof in the Business Combination on behalf of its members, which were then immediately distributed to Sponsor's members, including the reporting person, on a pro rata basis for no consideration. The reporting person is a managing member of Sponsor with shared voting and investment discretion with respect to securities held of record by Sponsor, and therefore, previously indirectly beneficially owned these securities through Sponsor."},{"field":"shares","element":"transactionShares","label":"F3","text":"Includes 834,060 unvested Elk Class B Shares."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"On March 17, 2023, the Issuer consummated the business combination (\"Business Combination\") contemplated by the Business Combination Agreement, dated as of September 25, 2022, as amended (the \"Business Combination Agreement\"), entered into by and among GX Acquisiton Corp. II, the Issuer, and Big Red Merger Sub Ltd, a wholly owned subsidiary of the Issuer. After the closing of the Business Combination, GX Acquisiton Corp. II changed its name to \"Elk Creek Resources Corp.\" GX Sponsor II LLC (\"Sponsor\") acquired Issuer securities and derivatives thereof in the Business Combination on behalf of its members, which were then immediately distributed to Sponsor's members, including the reporting person, on a pro rata basis for no consideration. The reporting person is a managing member of Sponsor with shared voting and investment discretion with respect to securities held of record by Sponsor, and therefore, previously indirectly beneficially owned these securities through Sponsor."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"Unvested Elk Class B Shars will vest if, from the closing of the Business Combination until the tenth anniversary thereof, the volume-weighted average price (\"VWAP\") of the Issuer's common shares exceeds certain thresholds as follows: (a) one-half will vest if the VWAP of the Issuer's common shares exceeds $12.50 for any 20 trading days within any 30 trading day period, and (b) the remaining half will vest if the VWAP of the Issuer's common shares exceeds $15.00 for any 20 trading days within any 30 trading day period."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"Unvested Elk Class B Shars will vest if, from the closing of the Business Combination until the tenth anniversary thereof, the volume-weighted average price (\"VWAP\") of the Issuer's common shares exceeds certain thresholds as follows: (a) one-half will vest if the VWAP of the Issuer's common shares exceeds $12.50 for any 20 trading days within any 30 trading day period, and (b) the remaining half will vest if the VWAP of the Issuer's common shares exceeds $15.00 for any 20 trading days within any 30 trading day period."}],"balance_after":1956880,"derivative":{"underlying":"Common Shares","underlying_shares":1956880},"source":{"system":"sec-edgar","filing":"0001539497-23-000474","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1322745/000153949723000474/ownership.xml","form_type":"4"}},{"id":2102494,"issuer":{"id":5368,"kind":"organization","name":"NIOCORP DEVELOPMENTS LTD"},"owners":[{"id":31444,"kind":"person","name":"Sims James 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2020."}],"balance_after":0,"derivative":{"exercise_price":0.4037,"expiration_date":"2023-11-15","underlying":"Common Shares","underlying_shares":350000},"source":{"system":"sec-edgar","filing":"0001539497-22-001882","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1688496/000153949722001882/ownership.xml","form_type":"4"}},{"id":2102493,"issuer":{"id":5368,"kind":"organization","name":"NIOCORP DEVELOPMENTS LTD"},"owners":[{"id":31444,"kind":"person","name":"Sims James T.","position":1,"cik":"0001688496","reported_name":"Sims James T.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"VP - External Affairs"}}],"security":"Common 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price reflected was converted from Canadian exercise price of C$0.47 using an exchange rate of C$1.3377 = US$1.00 as reported by the Bank of Canada on November 25, 2022."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The option, representing a right to purchase a total of 229,000 Common Shares, became exercisable on the issuance date of November 9, 2017."}],"balance_after":0,"derivative":{"exercise_price":0.3513,"expiration_date":"2022-11-30","underlying":"Common Shares","underlying_shares":229000},"source":{"system":"sec-edgar","filing":"0001539497-22-001878","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1688494/000153949722001878/ownership.xml","form_type":"4"}},{"id":2102500,"issuer":{"id":5368,"kind":"organization","name":"NIOCORP DEVELOPMENTS LTD"},"owners":[{"id":31445,"kind":"person","name":"Shah Neal 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Canadian exercise price of C$0.47 using an exchange rate of C$1.3377 = US$1.00 as reported by the Bank of Canada on November 25, 2022."}],"balance_after":630000,"source":{"system":"sec-edgar","filing":"0001539497-22-001878","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1688494/000153949722001878/ownership.xml","form_type":"4"}},{"id":2102498,"issuer":{"id":5368,"kind":"organization","name":"NIOCORP DEVELOPMENTS LTD"},"owners":[{"id":31445,"kind":"person","name":"Shah Neal S.","position":1,"cik":"0001688494","reported_name":"Shah Neal S.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Common 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