Exhibit 5.1

December 18, 2015

Board of Directors

Uranium Resources, Inc.

6950 South Potomac Street, Suite 300

Centennial, Colorado 80112

Ladies and Gentlemen:

We are acting as counsel to Uranium Resources, Inc., a Delaware corporation (the “Company”), in connection with the public offering of up to 2,500,000 shares (the “Shares”) of the common stock, par value $0.001 per share, of the Company, pursuant to the Subscription Agreement, dated December 17, 2015, between the purchasers named therein and the Company (the “Subscription Agreement”). The Shares were registered by the Company with the Securities and Exchange Commission on the shelf registration statement on Form S-3 (No. 333-196880) filed by the Company on June 18, 2014 and declared effective on June 30, 2014 (the “Registration Statement”), including the base prospectus, dated June 30, 2014, as supplemented by a prospectus supplement, dated December 17, 2015.  This opinion letter is furnished to you at your request to enable you to fulfill the requirements of Item 601(b)(5) of Regulation S-K, 17 C.F.R. § 229.601(b)(5), in connection with the Registration Statement.

For purposes of this opinion letter, we have examined copies of such agreements, instruments and documents as we have deemed an appropriate basis on which to render the opinions hereinafter expressed.   In our examination of the aforesaid documents, we have assumed the genuineness of all signatures, the legal capacity of all natural persons, the accuracy and completeness of all documents submitted to us, the authenticity of all original documents, and the conformity to authentic original documents of all documents submitted to us as copies (including telecopies).  As to all matters of fact, we have relied on the representations and statements of fact made in the documents so reviewed, and we have not independently established the facts so relied on.  This opinion letter is given, and all statements herein are made, in the context of the foregoing.

This opinion letter is based as to matters of law solely on the applicable provisions of the Delaware General Corporation Law, as amended. We express no opinion herein as to any other laws, statutes, ordinances, rules, or regulations (and in particular, we express no opinion as to any effect that such other laws, statutes, ordinances, rules, or regulations may have on the opinions expressed herein).

Based upon, subject to and limited by the foregoing, we are of the opinion that following (i) issuance and delivery of the Shares pursuant to the terms of the Subscription Agreement, and (ii) receipt by

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the Company of the consideration for the Shares specified in the resolutions of the Pricing Committee of the Board of Directors, the Shares will be validly issued, fully paid and non-assessable.

This opinion letter has been prepared for use in connection with the Registration Statement.  We assume no obligation to advise you of any changes in the foregoing subsequent to the date of this opinion letter.

We hereby consent to the filing of this opinion letter as Exhibit 5.1 to the Company’s Current Report on Form 8-K filed on December 18, 2015 and to the reference to this firm under the caption “Legal Matters” in the prospectus supplement constituting a part of the Registration Statement.  In giving this consent, we do not thereby admit that we are an “expert” within the meaning of the Securities Act of 1933, as amended.

Very truly yours,

/s/ Hogan Lovells US LLP

HOGAN LOVELLS US LLP

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