Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2012	Mar. 09, 2013	Jun. 29, 2012
Document and Entity Information
Entity Registrant Name	URANIUM RESOURCES INC /DE/
Entity Central Index Key	0000839470
Document Type	10-K
Document Period End Date	Dec. 31, 2012
Amendment Flag	true
Amendment Description	As previously disclosed in a Current Report on Form 8-K filed on November 19, 2013, Uranium Resources, Inc. (the “Company,” “URI,” “we,” “us” or “our”) historically capitalized development costs after confirmation of the existence of a commercially minable uranium deposit. After discussions with the Staff of the United States Securities and Exchange Commission (the “SEC”), URI management determined that the Company’s capitalization practices were not in conformance with the SEC’s Industry Guide 7, which allows capitalization of development costs only after proven or probable reserves have been declared. This Amendment No. 1 on Form 10-K/A (the “Amendment” or “Form 10-K/A”) amends and restates the Company’s Annual Report on Form 10-K for the year ended December 31, 2012, as originally filed with the SEC on March 18, 2013 (the “Original Form 10-K”). This Amendment amends and restates the Company’s consolidated financial statements and related disclosures as of December 31, 2011 and 2012 and for the years ended December 31, 2010, 2011 and 2012 (including restated financial information as of and for the interim periods contained therein) by reclassifying approximately $9.0 million of costs, approximately $3.9 million of which were recorded before 2010, from property, plant and equipment to mineral property expenses. The impact of the restatement is more fully described in Note 2 to the consolidated financial statements contained in this Amendment. As a result of the restatement, management has re-evaluated and amended its conclusions regarding the Company’s disclosure controls and procedures and internal control over financial reporting as contained in Item 9A of Part II. In addition, URI management has also determined, consistent with Industry Guide 7, to disclose mineralized material in terms of tons and grade only in its filings with the SEC. Accordingly, the Company will no longer disclose pounds of mineralized uranium material contained in the ground, and this Amendment removes all such disclosure. The Company has also expanded its property disclosure in response to comments from the Staff of the SEC. The following items of the Original Form 10-K have been modified or revised in this Form 10-K/A to reflect the restatement and other changes identified above: Part I, Item 1. “Business”; Part I, Item 2. “Properties”; Part II, Item 6. “Selected Financial Data”; Part II, Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations”; Part II, Item 8. “Financial Statements and Supplementary Data”; Part II, Item 9A. “Controls and Procedures”; and Part IV, Item 15. “Exhibits and Financial Statement Schedules”. The Company’s principal executive officer and principal financial officer have also provided currently dated certifications pursuant to Sections 302 and 906 of the Sarbanes-Oxley Act of 2002 in connection with this Amendment. This Amendment sets forth the Original Form 10-K in its entirety, except as required to reflect the effects of the restatement and other changes identified above. Except for disclosures affected by the restatement and other changes, this Amendment speaks as of the original filing date of the Original Form 10-K and does not modify or update other disclosures in the Original Form 10-K, including the nature and character of such disclosures, to reflect events occurring or items discovered after the original filing date of the Original Form 10-K. This Amendment should be read in conjunction with the Company’s filings made with the SEC subsequent to the original filing date of the Original Form 10-K, together with any amendments to those filings, including the Company’s amended Quarterly Reports on Form 10-Q/A for the quarterly periods ended March 31, 2013, June 30, 2013 and September 30, 2013, as filed with the SEC on December 17, 2013.
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 66,002,000
Entity Common Stock, Shares Outstanding		19,773,334
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY