United States Nuclear Regulatory Commission - Protecting People and the Environment

Umetco Minerals Corporation

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Site Summary

1.0 Site Identification

Type of Site: Uranium Recovery Facility
Location: Gas Hills Mining District, WY
License No.: SUA-648
Docket No.: 40-0299
License Status: Possession Only License
Project Manager: Dominick Orlando

2.0 Site Status Summary

The Umetco site is located in Fremont and Natrona Counties, Wyoming, approximately 60 miles east of Riverton in a remote area of central Wyoming. The site is located within the Gas Hills Uranium District of the Wind River Basin, in portions of Sections 10, 15, 16, and 22, Township 33 North, Range 89 West. The mill operated from 1960 – 1979 and has been dismantled.  The current Umetco site consists of 3 primary tailings disposal areas on the 1,920 acre parcel – the 170 acre Above Grade Tailings Impoundment (AGTI), the 55 acre A-9 repository and the 60 acre Heap Leach area.  In addition, GHP-2 adjacent to the AGTI also contains waste from the heap leach operations.  NRC approved the Final Status Survey for the site in 2005.  In 2009 erosion was detected on the slopes of the AGTI and A-9 covers and in 2010 Umetco submitted an erosion protection enhancement plan to the NRC.  The plan was approved in 2011 and Umetco completed the erosion enhancements in 2012. 

3.0 Major Technical or Regulatory Issues

Groundwater monitoring results indicated that some constitutients of concern are not attenuating as predicted in the groundwater model for the site and Umetco will be performing additional groundwater monitoring to better define the groundwater model for the site.

4.0 Estimated Date For Closure


Page Last Reviewed/Updated Tuesday, October 02, 2018