# EDGAR Filing Document

**Accession Number:** 0001512228
**File Stem:** 0001539497-23-000474
**Filing Date:** 2023-3
**Character Count:** 8610
**Document Hash:** 788a34fe3a8f76d6668356ee02ea5c72
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001539497-23-000474.hdr.sgml**: 20230321

**ACCESSION NUMBER**: 0001539497-23-000474

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20230317

**FILED AS OF DATE**: 20230321

**DATE AS OF CHANGE**: 20230321

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Kehler Dean C
- **CENTRAL INDEX KEY:** 0001322745

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-41655
- **FILM NUMBER:** 23750855

**MAIL ADDRESS:**
- **STREET 1:** C/O TRIMARAN CAPITAL PARTNERS
- **STREET 2:** 622 THIRD AVENUE, 35TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10017
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** NIOCORP DEVELOPMENTS LTD
- **CENTRAL INDEX KEY:** 0001512228
- **STANDARD INDUSTRIAL CLASSIFICATION:** METAL MINING [1000]
- **IRS NUMBER:** 000000000
- **STATE OF INCORPORATION:** A1
- **FISCAL YEAR END:** 0630

**BUSINESS ADDRESS:**
- **STREET 1:** 7000 S. YOSEMITE STREET
- **STREET 2:** STE. 115
- **CITY:** CENTENNIAL
- **STATE:** CO
- **ZIP:** 80112
- **BUSINESS PHONE:** 720-639-4647

**MAIL ADDRESS:**
- **STREET 1:** 7000 S. YOSEMITE STREET
- **STREET 2:** STE. 115
- **CITY:** CENTENNIAL
- **STATE:** CO
- **ZIP:** 80112

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** QUANTUM RARE EARTH DEVELOPMENTS CORP.
- **DATE OF NAME CHANGE:** 20110204

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

[ ] Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Kehler Dean C<br><sub>(Last) (First) (Middle)</sub><br>C/O NIOCORP DEVELOPMENTS LTD.<br>7000 YOSEMITE STREET, SUITE 115<br><sub>(Street)</sub><br>CENTENNIAL, CO 80112<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2023-03-17 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[X] Director [ ] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>NIOCORP DEVELOPMENTS LTD [ NB ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
|  |  |  |  |  |  |  |  |  |  |  |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| Class B Common Stock of Elk Creek Resources Corp. | <sup>(1)</sup> | 2023-03-17 |  | A<sup>(2)</sup> |  | 1956880<sup>(3)</sup> |  | <sup>(4)</sup> | <sup>(4)</sup> | Common Shares | 1956880 | <sup>(2)</sup> | 1956880 | D |  |
| Class B Common Stock of Elk Creek Resources Corp. | <sup>(1)</sup> | 2023-03-17 |  | A<sup>(2)</sup> |  | 555038<sup>(5)</sup> |  | <sup>(4)</sup> | <sup>(4)</sup> | Common Shares | 555038 | <sup>(2)</sup> | 555038 | I | By trust |
| Warrants | 10.284<sup>(7)</sup> | 2023-03-17 |  | A<sup>(2)</sup> |  | 1657057<sup>(7)</sup> |  | <sup>(6)</sup> | <sup>(6)</sup> | Common Shares | 1853073<sup>(7)</sup> | <sup>(2)</sup> | 1657057<sup>(7)</sup> | D |  |

---

### Footnotes:

(1) 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.

(2) 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.

(3) Includes 834,060 unvested Elk Class B Shares.

(4) 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.

(5) Includes 236,568 unvested Elk Class B Shares.

(6) 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.

(7) 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).

**Signature:** /s/ Neal Shah  
**Date:** 2023-03-21

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**