SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE 13D

(Rule 13d-101)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT

TO § 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO

§ 240.13d-2(a)

UNDER THE SECURITIES AND EXCHANGE ACT OF 1934

(Amendment No. 1)*

Rare Element Resources Ltd.

(Name of Issuer)

Kenneth J. Mushinski

Synchron

3550 General Atomics Court

San Diego, CA 92121-1122

(858) 455-3000

copies to:

Donald G. Kilpatrick, Esq.

Pillsbury Winthrop Shaw Pittman LLP

1540 Broadway

New York, NY 10036-4039

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box ☐.

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See § 240.13d-7 for other parties to whom copies are to be sent.

*The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The Information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

---

1	NAMES OF REPORTING PERSONS
	Synchron
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP			(a)	☐
				(b)	☒
3	SEC USE ONLY
4	SOURCE OF FUNDS (SEE INSTRUCTIONS)
	WC
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E)				☐
6	CITIZENSHIP OR PLACE OF ORGANIZATION
	California
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		7	SOLE VOTING POWER
			50,825,000 Common Shares (See Item 5)
		8	SHARED VOTING POWER
			0
		9	SOLE DISPOSITIVE POWER
			50,825,000 Common Shares (See Item 5)
		10	SHARED DISPOSITIVE POWER
			0
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
	50,825,000 Common Shares (See Item 5)
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)				☐
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
	49.0% of Common Shares (See Item 5)
14	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
	CO

1	NAMES OF REPORTING PERSONS
	General Atomic Technologies Corporation
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP			(a)	☐
				(b)	☒
3	SEC USE ONLY
4	SOURCE OF FUNDS (SEE INSTRUCTIONS)
	WC
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E)				☐
6	CITIZENSHIP OR PLACE OF ORGANIZATION
	Wyoming
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		7	SOLE VOTING POWER
			50,825,000 Common Shares (See Item 5)
		8	SHARED VOTING POWER
			0
		9	SOLE DISPOSITIVE POWER
			50,825,000 Common Shares (See Item 5)
		10	SHARED DISPOSITIVE POWER
			0
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
	50,825,000 Common Shares (See Item 5)
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)				☐
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
	49.0% of Common Shares (See Item 5)
14	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
	CO

1	NAMES OF REPORTING PERSONS
	Tenaya Corporation
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP			(a)	☐
				(b)	☒
3	SEC USE ONLY
4	SOURCE OF FUNDS (SEE INSTRUCTIONS)
	WC
5	CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(D) OR 2(E)				☐
6	CITIZENSHIP OR PLACE OF ORGANIZATION
	Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		7	SOLE VOTING POWER
			50,825,000 Common Shares (See Item 5)
		8	SHARED VOTING POWER
			0
		9	SOLE DISPOSITIVE POWER
			50,825,000 Common Shares (See Item 5)
		10	SHARED DISPOSITIVE POWER
			0
11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
	50,825,000 Common Shares (See Item 5)
12	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)				☐
13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
	49.0% of Common Shares (See Item 5)
14	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
	CO

Item 1.

Security and Issuer.

This Amendment No. 1 amends and restates the Schedule 13D filed on October 2, 2017 (the “Original Schedule 13D”).  The Original Schedule 13D and this Amendment No. 1 are collectively referred to herein as the “Schedule 13D”.  Capitalized terms used but not defined in this Amendment No. 1 shall have the meanings given to them in the Original Schedule 13D.  The Original Schedule 13D remains in full force and effect, except as specifically amended by this Amendment No. 1.

The class of equity securities to which this amendment to Schedule 13D (this “Amendment No. 1”) relates is the Common Shares, no par value, of Rare Element Resources Ltd., a British Columbia corporation (the “Issuer”). The Issuer’s principal executive offices are P.O. Box 271049, Littleton, Colorado 80127.

Item 2.

Identity and Background.

(a)-(c)        The persons filing this Schedule 13D are Synchron, a California corporation (“Synchron”), General Atomic Technologies Corporation, a Wyoming corporation and parent company of Synchron (“GATC”) and Tenaya Corporation, a Delaware corporation and parent company of GATC (“Tenaya, and together with Synchron and GATC, the “Reporting Persons”).  Synchron is a privately-owned company for diversified businesses in technology and other industries and its principal office and business is located at 3550 General Atomics Court, San Diego, California 92121-1122. GATC is a privately-owned holding company for diversified businesses in technology and other industries and its principal office and business is located at 3550 General Atomics Court, San Diego, California 92121-1122.  Tenaya is a privately-owned holding company for diversified businesses in technology and other industries and its principal office and business is located at P.O. Box 910304, San Diego, California, 92191-0304.

(d)-(e)        During the last five years, none of the Reporting Persons has been (A) convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors) or (B) a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.

(f)

N/A

Item 3.

Source and Amount of Funds or Other Consideration.

On October 2, 2017, the Issuer and Synchron executed an investment agreement (the “Investment Agreement”) providing for the purchase of Common Shares of the Issuer. Pursuant to the Investment Agreement, Synchron acquired (x) the right to designate two directors to fill vacancies on the Board of Directors of the Issuer and (y) 26,650,000 Common Shares of the Issuer (the “Acquired Shares”), which constituted approximately 33.5% of the fully-diluted Common Shares issued and outstanding as of the date of the transaction, for $4,752,000 in cash, including a $500,000 preliminary payment made on August 18, 2017 pursuant to a term sheet executed between the Issuer and an affiliate of Synchron (the “Purchase Price”). The Issuer and Synchron also executed an intellectual property rights agreement, pursuant to which the Issuer has granted Synchron certain rights to the Issuer’s intellectual property relating to rare earth processing and separation.

The Issuer also granted Synchron an option (the “Option”) to purchase a number Common Shares of the Issuer that constitute 15.496667690889% of the fully diluted Common Shares of the Issuer immediately after the exercise of the Option (the “Option Shares”) at a total exercise price of $5,040,000 in cash (the “Option Exercise Price”).  On October 14, 2019, Synchron exercised the Option in full by delivering an exercise notice to the Issuer pursuant to the Investment Agreement and will therefore acquire 24,175,000 Common Shares from the Issuer for the Option Exercise Price (such transaction, the “2019 Option Exercise”).  The Option Shares, when acquired by Synchron, together with the Acquired Shares, will constitute approximately 49.0% of the fully diluted Common Shares issued and outstanding as of the filing of its Quarterly Report on Form 10-Q for the period ended June 30, 2019 (assuming, for the purpose of computing this percentage, that the Option Shares are deemed to be outstanding in accordance with Rule 13d-3 pursuant to the Securities Exchange Act of 1934, as amended).

The source of the Purchase Price and the Option Exercise Price was available cash and cash equivalents of Synchron.

Item 4.

Purpose of the Transaction.

See Item 3.

Item 5.

Interest in Securities of the Issuer.

(a)-(b) Synchron is the beneficial owner of 50,825,000 Common Shares of the Issuer, including 26,650,000 Acquired Shares (which were issued in connection with the Investment Agreement transaction described in the Original Schedule 13D) and 24,175,000 Option Shares (which are to be issued in connection with the 2019 Option Exercise), constituting in the aggregate approximately 49.0% of the Common Shares of the Issuer outstanding as of the filing of its Quarterly Report on Form 10-Q for the period ended June 30, 2019 (assuming, for the purpose of computing this percentage, that the Option Shares are deemed to be outstanding in accordance with Rule 13d-3 pursuant to the Securities Exchange Act of 1934, as amended). Synchron has the sole voting and dispositive power over the Acquired Shares and, upon acquisition, will have the sole voting and dispositive power over the Option Shares.

Because each of General Atomic Technologies Corporation and Tenaya Corporation may be deemed to control Synchron, each of General Atomic Technologies Corporation and Tenaya Corporation may be deemed to beneficially own, and to have the power to vote or direct the vote, or dispose or direct the disposition of, all of the Common Shares beneficially owned by Synchron.

The filing of this Schedule 13D should not be construed as an admission that any Reporting Person is the beneficial owner of any of the shares of Common Shares that such Reporting Person may be deemed to beneficially own.

(e)	Not applicable.

Item 6.

Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.

Pursuant to Rule 13d-1(k) promulgated under the Exchange Act, the Reporting Persons have entered into an agreement with respect to the joint filing of this statement, and any amendment or amendments hereto.

By virtue of the relationships between and among the Reporting Persons, as described in Item 2, the Reporting Persons may be deemed to be a “group” under the Federal securities laws.

Except as described or referred to above, there are no contracts, arrangements, understandings or relationships among the Reporting Persons, or between such persons and any other person with respect to any securities of the Issuer, including but not limited to transfer or voting of any securities of the Issuer, finder’s fees, joint ventures, loan or option arrangements, puts or calls, guarantees of profits, division of profits or loss, or the giving or withholding of proxies.

Item 7.

Material to be Filed as Exhibits.

Item 7 of the Original 13D is hereby incorporated by reference in its entirety.

SIGNATURES

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Dated: October 15, 2019

---